The SemiQ™ Series of dc-dc converters provides a high-efficiency single
output in a size that is only 60% of industry-standard quarter-bricks, while
preserving the same pinout and functionality.
In high temperature environments, for output voltages ranging from 3.3 V to
1.0 V, the thermal performance of SemiQ™ converters exceeds that of most
competitors' 20-25 A quarter-bricks. This performance is accomplished
through the use of patent-pending circuit, packaging, and processing
techniques to achieve ultra-high efficiency, excellent thermal management,
and a very low body profile.
Low body profile and the preclusion of heat sinks minimize airflow shadowing,
thus enhancing cooling for downstream devices. The use of 100% automation
for assembly, coupled with advanced electronic circuits and thermal design,
results in a product with extremely high reliability.
Operating from a 36-75 V input, the SQ48 Series converters provide any
standard output voltage from 12 V down to 1.0 V. Outputs can be trimmed
fro1m –20% to +10% of the nominal output voltage (±10% for output voltages
1.2 V and 1.0 V), thus providing outstanding design flexibility.
With a standard pinout and trim equations, the SQ48 Series converters are
perfect drop-in replacements for existing quarter-brick designs. Inclusion of
this converter in new designs can result in significant board space and cost
savings. In both cases the designer can expect reliability improvement over
other available converters because of the SQ48 Series’ optimized thermal
efficiency.
Delivers up to 15A (50W)
Industry-standard quarter-brick pinout
Outputs available in 12.0, 8.0, 6.0, 5.0, 3.3, 2.5, 2.0, 1.8, 1.5, 1.2, and 1.0 V
Available in through-hole and SMT packages
On-board input differential LC-filter
Startup into pre-biased output
No minimum load required
Withstands 100 V input transient for 100 ms
Fixed-frequency operation
Fully protected
Remote output sense
Positive or negative logic ON/OFF option
Output voltage trim range: +10%/−20% with industry-standard trim equations
(except 1.2 V and 1.0 V outputs with trim range ±10%)
Output voltage trim range: +10%/−20% with industry-standard trim equations
(except 1.2 V and 1.0 V outputs with trim range ±10%)
Approved to latest edition/revision of UL/CSA 60950-1, EN60950-1 and IEC
60950-1
Designed to meet Class B conducted emissions per FCC and EN55022 when
used with external filter
All materials meet UL94, V-0 flammability rating
SQ48 DC-DC Series
2
1.
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µF, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Absolute Maximum Ratings
Input Voltage
0
80
VDC
Operating Ambient Temperature
Continuous
-40
85
°C
Storage Temperature
-55
125
°C
Input Characteristics
Operating Input Voltage Range
Input Undervoltage Lockout
Turn-on Threshold
Turn-off Threshold
Input Voltage Transient
36
48
75
VDC
33
34
35
VDC
31
32
33
VDC
100
VDC
Non-latching
100 ms
Isolation Characteristics
I/O Isolation
Isolation Capacitance
2000
VDC
1.0 - 3.3 V
160
pF
5.0 - 6.0 V
260
pF
8.0 - 12 V
Isolation Resistance
230
pF
10
MΩ
Feature Characteristics
Switching Frequency
Output Voltage Trim Range1
415
kHz
Industry-std. equations (1.5 - 12V)
-20
+10
%
Use trim equation on Page 4 (1.0 -1.2 V)
-10
+10
%
+10
%
Remote Sense Compensation1
Percent of VOUT(NOM)
Output Overvoltage Protection
Non-latching ( 1.5 – 12 V)
117
122
127
%
Non-latching (1.0 -1.2 V)
124
132
140
%
Auto-Restart Period
Applies to all protection features
Turn-On Time
See Figures 6, 7 and 8
100
ms
4
ms
ON/OFF Control (Positive Logic)
Converter Off (logic low)
-20
0.8
VDC
Converter On (logic high)
2.4
20
VDC
Converter Off (logic high)
2.4
20
VDC
Converter On (logic low)
-20
0.8
VDC
ON/OFF Control (Negative Logic)
1
Vout can be increased up to 10% via the sense leads or up to 10% via the trim function. However, the total output voltage trim
from all sources should not exceed 10% of VOUT (NOM), in order to ensure specified operation of overvoltage protection
circuitry.
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SQ48 DC-DC Series
3
2.
These power converters have been designed to be stable with no external capacitors when used in low inductance input and
output circuits.
In many applications, the inductance associated with the distribution from the power source to the input of the converter can
affect the stability of the converter. The addition of a 33 μF electrolytic capacitor with an ESR < 1 Ω across the input helps to
ensure stability of the converter. In many applications, the user has to use decoupling capacitance at the load. The power
converter will exhibit stable operation with external load capacitance up to 1000 μF on 12 V, 2,200 μF on 8.0 V, 10,000 μF on 5.0
– 6.0 V, and 15,000 μF on 3.3 – 1.0 V outputs. Additionally, see the EMC section of this data sheet for discussion of other external
components which may be required for control of conducted emissions.
The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control options
available, positive logic and negative logic, with both referenced to Vin(-). A typical connection is shown in Fig. 1.
Figure 1. Circuit configuration for ON/OFF function
The positive logic version turns on when the ON/OFF pin is at a logic high and turns off when at a logic low. The converter is on
when the ON/OFF pin is left open. See Electrical Specifications for logic high/low definitions.
The negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. The ON/OFF pin
can be hardwired directly to Vin(-) to enable automatic power up of the converter without the need of an external control signal.
The ON/OFF pin is internally pulled up to 5V through a resistor. A properly debounced mechanical switch, open collector
transistor, or FET can be used to drive the input of the ON/OFF pin. The device must be capable of sinking up to 0.2 mA at a low
level voltage of ≤ 0.8 V. An external voltage source (±20 V maximum) may be connected directly to the ON/OFF input, in which
case it must be capable of sourcing or sinking up to 1 mA depending on the signal polarity. See the Startup Information section
for system timing waveforms associated with use of the ON/OFF pin.
The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter
and the load. The SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should be connected at the load or at the point where regulation is
required (see Fig. 2).
Figure 2. Remote sense circuit configuration
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CAUTION
If remote sensing is not utilized, the SENSE(-) pin must be connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin must be
connected to the Vout(+) pin (Pin 8) to ensure the converter will regulate at the specified output voltage. If these connections are
not made, the converter will deliver an output voltage that is slightly higher than the specified data sheet value.
Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces
should be run side by side and located close to a ground plane to minimize system noise and ensure optimum performance.
When using the remote sense function, the converter’s output overvoltage protection (OVP) senses the voltage across Vout(+)
and Vout(-), and not across the sense lines, so the resistance (and resulting voltage drop) between the output pins of the converter
and the load should be minimized to prevent unwanted triggering of the OVP.
When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability of
the converter, which is equal to the product of the nominal output voltage and the allowable output current for the given
conditions.
When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rating in
order to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the maximum current
(originally obtained from the derating curves) by the same percentage to ensure the converter’s actual output power remains at
or below the maximum allowable output power.
The output voltage can be adjusted up 10% or down 20% for Vout ≥ 1.5 V, and 10% for Vout = 1.2 V relative to the rated output
voltage by the addition of an externally connected resistor. For output voltage 3.3 V, trim up to 10% is guaranteed only at Vin ≥
40 V, and it is marginal (8% to 10%) at Vin = 36 V.
The TRIM pin should be left open if trimming is not being used. To minimize noise pickup, a 0.1 μF capacitor is connected
internally between the TRIM and SENSE(-) pins.
To increase the output voltage, refer to Fig. 3. A trim resistor, RT-INCR, should be connected between the TRIM (Pin 6) and
SENSE(+) (Pin 7), with a value of:
RTINCR
5.11(100 Δ)V ONOM 626
10.22 [kΩ], for 1.5 – 12 V
1.225Δ
[kΩ], for 1.2 V
[kΩ], for 1.0 V
where,
RTINCR Required value of trim-up resistor k]
VONOM Nominal value of output voltage [V]
Δ
VOREQ
(VO-REQ VO-NOM )
X 100
VO -NOM
[%]
Desired (trimmed) output voltage [V].
Figure 3. Configuration for increasing output voltage
When trimming up, care must be taken not to exceed the converter‘s maximum allowable output power. See the previous section
for a complete discussion of this requirement.
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SQ48 DC-DC Series
5
To decrease the output voltage (Fig. 4), a trim resistor, RT-DECR, should be connected between the TRIM (Pin 6) and SENSE(-) (Pin
5), with a value of:
[kΩ] for 1.5 – 12 V
[kΩ] for 1.2 V
[kΩ] for 1.0 V
where,
RTDECR Required value of trim-down resistor [kΩ] and Δ
is defined above.
Note:
The above equations for calculation of trim resistor values match those typically used in conventional industry-standard quarterbricks and one-eighth bricks (except for 1.2 V and 1.0 V outputs).
Converters with output voltages 1.2 V and 1.0 V are available with alternative trim feature to provide the customers with the
flexibility of second sourcing. These converters have a “T” character in the part number. The trim equations of “T” version of
converters and more information can be found in Application Note 103.
Figure 4. Configuration for decreasing output voltage
Trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could cause
unwanted triggering of the output overvoltage protection (OVP) circuit. The designer should ensure that the difference between
the voltages across the converter’s output pins and its sense pins does not exceed 10% of VOUT(nom), or:
[VOUT() VOUT()] [VSENSE() VSENSE()] VO - NOM X 10% [V]
This equation is applicable for any condition of output sensing and/or output trim.
3.
Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops below a
pre-determined voltage.
The input voltage must be typically 34 V for the converter to turn on. Once the converter has been turned on, it will shut off when
the input voltage drops typically below 32 V. This feature is beneficial in preventing deep discharging of batteries used in telecom
applications.
The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the converter
will switch to constant current operation and thereby begin to reduce output voltage. When the output voltage drops below 50%
of the nominal value of output voltage, the converter will shut down (Fig. x.17).
Once the converter has shut down, it will attempt to restart nominally every 100 ms with a typical 1-2% duty cycle (Fig. x.18).
The attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output voltage
rises above 50% of its nominal value.
Once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and continues
normal operation.
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SQ48 DC-DC Series
6
The converter will shut down if the output voltage across Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of the OVP
circuitry. The OVP circuitry contains its own reference, independent of the output voltage regulation loop. Once the converter
has shut down, it will attempt to restart every 100 ms until the OVP condition is removed.
The converter will shut down under an overtemperature condition to protect itself from overheating caused by operation outside
the thermal derating curves, or operation in abnormal conditions such as system fan failure. After the converter has cooled to a
safe operating temperature, it will automatically restart.
The converters meet North American and International safety regulatory requirements. Basic Insulation is provided between input
and output.
To comply with safety agencies’ requirements, an input line fuse must be used external to the converter. The Table below
provides the recommended fuse rating for use with this family of products.
OUTPUT VOLTAGE
FUSE RATING
3.3 V
4A
12 – 5.0 V, 2.5 V
3A
2.0 – 1.2 V
2A
All SQ converters are UL approved for a maximum fuse rating of 15 Amps. To protect a group of converters with a single fuse,
the rating can be increased from the recommended values above.
EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC characteristics of
board mounted component dc-dc converters exist. However, Bel Power Solutions tests its converters to several system level
standards, primary of which is the more stringent EN55022, Information technology equipment - Radio disturbance
characteristics - Limits and methods of measurement.
An effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC.
With the addition of a simple external filter (see Application Note 100), all versions of the SQ48 Series converters pass the
requirements of Class B conducted emissions per EN55022 and FCC requirements. Please contact Bel Power Solutions
Applications Engineering for details of this testing.
4.
The converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a
function of ambient temperature and airflow) for vertical and horizontal mounting, efficiency, startup and shutdown parameters,
output ripple and noise, transient response to load step-change, overload, and short circuit.
The figures are numbered as Fig. x.y, where x indicates the different output voltages, and y associates with specific plots (y = 1
for the vertical thermal derating). For example, Fig. x.1 will refer to the vertical thermal derating for all the output voltages in
general.
The following pages contain specific plots or waveforms associated with the converter. Additional comments for specific data
are provided below.
All data presented were taken with the converter soldered to a test board, specifically a 0.060” thick printed wiring board (PWB)
with four layers. The top and bottom layers were not metalized. The two inner layers, comprised of two-ounce copper, were used
to provide traces for connectivity to the converter.
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SQ48 DC-DC Series
7
The lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter
to the PWB was minimized. This provides a worst-case but consistent scenario for thermal derating purposes.
All measurements requiring airflow were made in the vertical and horizontal wind tunnel using Infrared (IR) thermography and
thermocouples for thermometry.
Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one anticipates
operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating
temperatures in the application. Thermographic imaging is preferable; if this capability is not available, then thermocouples may
be used. The use of AWG #40 gauge thermocouples is recommended to ensure measurement accuracy. Careful routing of the
thermocouple leads will further minimize measurement error. Refer to Fig. 5 for the optimum measuring thermocouple location.
Figure 5. Location of the thermocouple for thermal testing
Load current vs. ambient temperature and airflow rates are given in Fig. x.1 to Fig. x.4 for through-hole and surface-mount
versions. Ambient temperature was varied between 25°C and 85°C, with airflow rates from 30 to 500LFM (0.15 to 2.5m/s), and
vertical and horizontal converter mounting.
For each set of conditions, the maximum load current was defined as the lowest of:
(i)
(ii)
The output current at which any FET junction temperature does not exceed a maximum specified temperature (120°C)
as indicated by the thermographic image, or
The nominal rating of the converter (4A on 12V, 5.3A on 8.0V, 8A on 6.0V, 10A on 5.0V, and 15A on 3.3 – 1.0V).
During normal operation, derating curves with maximum FET temperature less or equal to 120 °C should not be exceeded.
Temperature on the PCB at thermocouple location shown in Fig. E should not exceed 118 °C in order to operate inside the
derating curves.
Fig. x.5 shows the efficiency vs. load current plot for ambient temperature of 25ºC, airflow rate of 300 LFM (1.5 m/s) with vertical
mounting and input voltages of 36V, 48V and 72V. Also, a plot of efficiency vs. load current, as a function of ambient temperature
with Vin = 48V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. x.6.
Fig. x.7 shows the power dissipation vs. load current plot for Ta = 25ºC, airflow rate of 300LFM (1.5 m/s) with vertical mounting
and input voltages of 36V, 48V and 72V. Also, a plot of power dissipation vs. load current, as a function of ambient temperature
with Vin = 48V, airflow rate of 200LFM (1 m/s) with vertical mounting is shown in Fig. x.8.
Output voltage waveforms, during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are
shown without and with external load capacitance in Fig. x.9 and Fig. x.10, respectively.
Fig. x.13 shows the output voltage ripple waveform, measured at full rated load current with a 10 μF tantalum and 1 μF ceramic
capacitor across the output. Note that all output voltage waveforms are measured across a 1 μF ceramic capacitor.
The input reflected ripple current waveforms are obtained using the test setup shown in Fig x.14. The corresponding waveforms
are shown in Fig. x.15 and Fig. x.16.
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Scenario #1: Initial Startup From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure 6.
Time
t0
Comments
ON/OFF pin is ON; system front-end power is toggled
on, VIN to converter begins to rise.
t1
VIN crosses undervoltage Lockout protection circuit
threshold; converter enabled.
t2
Converter begins to respond to turn-on command
(converter turn-on delay).
t3
Converter VOUT reaches 100% of nominal value.
For this example, the total converter startup time (t3- t1) is typically
4 ms.
Figure 6. Startup scenario #1
Scenario #2: Initial Startup Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure 7.
Time
t0
t1
Comments
VINPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
t2
End of converter turn-on delay.
t3
Converter VOUT reaches 100% of nominal value.
For this example, the total converter startup time (t3- t1) is typically
4 ms.
Figure 7. Startup scenario #2
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously powered, converter is disabled and then
enabled via ON/OFF pin. See Figure 8.
Time
t0
t1
Comments
VIN and VOUT are at nominal values; ON/OFF pin ON.
ON/OFF pin arbitrarily disabled; converter output falls
to zero; turn-on inhibit delay period (100 ms typical) is
initiated, and ON/OFF pin action is internally inhibited.
t2
ON/OFF pin is externally re-enabled.
If (t2- t1) ≤ 100 ms, external action of ON/OFF pin
is locked out by startup inhibit timer.
If (t2- t1) > 100 ms, ON/OFF pin action is internally
enabled.
t3
Turn-on inhibit delay period ends. If ON/OFF pin is
ON, converter begins turn-on; if off, converter awaits
ON/OFF pin ON signal; see Figure G.
t4
End of converter turn-on delay.
t5
Converter VOUT reaches 100% of nominal value.
For the condition, (t2- t1) ≤ 100 ms, the total converter startup time
(t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, startup will be
typically 4 ms after release of ON/OFF pin.
Figure 8. Startup scenario #3
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SQ48 DC-DC Series
9
5.
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 12 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Input Characteristics
Maximum Input Current
4 ADC, 12 VDC Out @ 36 VDC In
Input Stand-by Current
Vin = 48V, converter disabled
3
mADC
Vin = 48V, converter enabled
45
mADC
25MHz bandwidth
6
Input No Load Current (0 load
on the output)
Input Reflected-Ripple
Current
1.53
ADC
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
11.880
12.000
12.120
VDC
±4
±5
mV
Output Regulation
Over Line
Over Load
±4
Output Voltage Range
Over line, load and temperature2
Output Ripple and Noise - 25
MHz
bandwidth
Full load + 10 μF tantalum + 1 Μf ceramic
External Load Capacitance
Plus full load (resistive)
11.820
80
Output Current Range
0
Current Limit Inception
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
4.5
±5
mV
12.180
VDC
120
mVPK-PK
1,000
μF
4
ADC
5
5.5
ADC
7.5
10
A
4
Arms
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
Co = 1 μF ceramic
200
mV
di/dt = 5 A/μs
Co = 47 μF tantalum + 1 μF ceramic
200
mV
400
μs
100% Load
87.0
%
50% Load
87.0
%
Settling Time to 1%
Efficiency
2
-40 ºC to 85 ºC.
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SQ48 DC-DC Series
Figure 12V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T04120 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 12V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T04120 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Fig. 12V.3: Efficiency vs. load current and input voltage for
SQ48T/S04120 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 12V.4: Efficiency vs. load current and ambient temperature
for SQ48T/S04120 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
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SQ48 DC-DC Series
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Fig. 12V.5: Power dissipation vs. load current and input voltage
for SQ48T/S04120 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 12V.6: Power dissipation vs. load current and ambient
temperature for SQ48T/S04120 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
Fig. 12V.7: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(5V/div.). Time scale: 1ms/div.
Fig. 12V.8: Turn-on transient at full rated load current (resistive)
plus 1,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (5V/div.).
Time scale: 2ms/div.
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SQ48 DC-DC Series
Fig. 12V.9: Output voltage response to load current step-change
(1A – 2A – 1A) at Vin = 48V. Top trace: output voltage
(200mV/div.). Bottom trace: load current (1A/div.). Current slew
rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.5 ms/div.
Fig. 12V.10: Output voltage response to load current step-change
(1A – 2A – 1A) at Vin = 48V. Top trace: output voltage (200
mV/div.). Bottom trace: load current (1A/div.). Current slew rate: 5
A/μs. Co = 47μF tantalum + 1μF ceramic. Time scale: 0.5 ms/div.
Fig. 12V.11: Output voltage ripple (50 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 12V.12: Test Setup for measuring input reflected ripple
currents, ic and is
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SQ48 DC-DC Series
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Fig. 12V.13: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 12V.14 for test setup. Time scale: 1μs/div.
Fig. 12V.14: Input reflected ripple current, is (100 mA/div.),
measured at input terminals at full rated full rated load current and
Vin = 48V. Refer to Fig. 12V.14 for test setup. Time scale: 1μs/div.
Fig. 12V.15: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 12V.16: Load current (top trace, 5A/div., 20 ms/div.) into a 10
mΩ short circuit during restart, at Vin = 48V. Bottom trace
(5A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
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14
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 8.0 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
1.38
ADC
Input Characteristics
Maximum Input Current
5.3 ADC, 8.0 VDC Out @ 36 VDC In
Input Stand-by Current
Vin = 48V, converter disabled
3
mADC
Input No Load Current (0 load
on the output)
Vin = 48V, converter enabled
33
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
7.920
8.000
8.080
VDC
Over Line
±4
±10
mV
Over Load
±4
±10
mV
8.120
VDC
Output Regulation
3
Output Voltage Range
Over line, load and temperature
Output Ripple and Noise - 25
MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
External Load Capacitance
Plus full load (resistive)
Output Current Range
7.880
70
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
5.75
mVPKPK
2,200
μF
5.3
ADC
6.25
6.75
ADC
10
12
A
4
Arms
0
Current Limit Inception
100
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
Co = 1 μF ceramic
160
mV
di/dt = 5 A/μs
Co = 94 μF tantalum + 1 μF ceramic
160
mV
400
μs
Settling Time to 1%
Efficiency
100% Load
85.5
50% Load
87.0
3
%
%
-40 ºC to 85 ºC.
tech.support@psbel.com
SQ48 DC-DC Series
15
Figure 8.0V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T05080 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 8.0V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T05080 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Fig. 8.0V.3: Efficiency vs. load current and input voltage for
SQ48T/S05080 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 8.0V.4: Efficiency vs. load current and ambient temperature
for SQ48T/S05080 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
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SQ48 DC-DC Series
Fig. 8.0V.5: Power dissipation vs. load current and input voltage
for SQ48T/S05080 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 8.0V.6: Power dissipation vs. load current and ambient
temperature for SQ48T/S05080 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
Fig. 8.0V.7: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(2V/div.). Time scale: 1ms/div.
Fig. 8.0V.8: Turn-on transient at full rated load current (resistive)
plus 2,200 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (2V/div.).
Time scale: 2ms/div.
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SQ48 DC-DC Series
17
Fig. 8.0V.9: Output voltage response to load current step-change
(1.325A – 2.65A – 1.325A) at Vin = 48V. Top trace: output voltage
(200mV/div.). Bottom trace: load current (1A/div.). Current slew
rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.5 ms/div.
Fig. 8.0V.10: Output voltage response to load current stepchange (1.325A – 2.65A – 1.325A) at Vin = 48V. Top trace: output
voltage (200 mV/div.). Bottom trace: load current (1A/div.). Current
slew rate: 5 A/μs. Co = 94μF tantalum + 1μF ceramic. Time scale:
0.5 ms/div.
Fig. 8.0V.11: Output voltage ripple (50 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 8.0V.12: Test Setup for measuring input reflected ripple
currents, ic and is
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SQ48 DC-DC Series
Fig. 8.0V.13: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 8.0V.14 for test setup. Time scale: 1μs/div.
Fig. 8.0V.14: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 8.0V.14 for test setup. Time scale: 1μs/div.
Fig. 8.0V.15: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 8.0V.16: Load current (top trace, 5A/div., 20 ms/div.) into a 10
mΩ short circuit during restart, at Vin = 48V. Bottom trace
(5A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
tech.support@psbel.com
SQ48 DC-DC Series
19
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 6.0 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Input Characteristics
Maximum Input Current
8 ADC, 6.0 VDC Out @ 36 VDC In
Input Stand-by Current
Input No Load Current (0 load
on the output)
Vin = 48V, converter disabled
3
1.5
mADC
ADC
Vin = 48V, converter enabled
45
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
Output Regulation
6.000
6.060
VDC
Over Line
±2
±10
mV
Over Load
±2
±10
mV
6.090
VDC
Output Voltage Range
Output Ripple and Noise - 25
MHz
bandwidth
External Load Capacitance
5.940
Over line, load and temperature4
5.910
Full load + 10 μF tantalum + 1 μF ceramic
45
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
8.4
PK
μF
8
ADC
10
11.5
ADC
15
25
A
5.3
Arms
0
Current Limit Inception
mVPK-
10,000
Plus full load (resistive)
Output Current Range
60
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
di/dt = 5 A/μs
Co = 1 μF ceramic
Co = 450© μF tantalum + 1 μF ceramic
160
mV
80
mV
200
μs
100% Load
89.0
%
50% Load
89.0
%
Settling Time to 1%
Efficiency
4
-40 ºC to 85 ºC.
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SQ48 DC-DC Series
Figure 6.0V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T08060 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 6.0V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T08060 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Fig. 6.0V.3: Efficiency vs. load current and input voltage for
SQ48T/S08060 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 6.0V.4: Efficiency vs. load current and ambient temperature
for SQ48T/S08060 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
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SQ48 DC-DC Series
21
Fig. 6.0V.5: Power dissipation vs. load current and input voltage
for SQ48T/S08060 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 6.0V.6: Power dissipation vs. load current and ambient
temperature for SQ48T/S08060 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
Fig. 6.0V.7: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(2V/div.). Time scale: 2ms/div.
Fig. 6.0V.8: Turn-on transient at full rated load current (resistive)
plus 10,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (2V/div.).
Time scale: 5ms/div.
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SQ48 DC-DC Series
Fig. 6.0V.9: Output voltage response to load current step-change
(2 A – 4 A – 2 A) at Vin = 48V. Top trace: output voltage
(100mV/div.). Bottom trace: load current (2A/div.). Current slew
rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.2 ms/div.
Fig. 6.0V.10: Output voltage response to load current stepchange (2 A – 4 A – 2 A) at Vin = 48V. Top trace: output voltage
(100 mV/div.). Bottom trace: load current (2A/div.). Current slew
rate: 5 A/μs. Co = 450μF tantalum + 1μF ceramic. Time scale: 0.2
ms/div.
Fig.6.0V.11: Output voltage ripple (50 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 6.0V.12: Test Setup for measuring input reflected ripple
currents, ic and is
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SQ48 DC-DC Series
23
Fig. 6.0V.13: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 6.0V.14 for test setup. Time scale: 1μs/div.
Fig. 6.0V.14: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 6.0V.14 for test setup. Time scale: 1μs/div.
Fig. 6.0V.15: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 6.0V.16: Load current (top trace, 10A/div., 20 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48V. Bottom trace
(10A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
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SQ48 DC-DC Series
24
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 5.0 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
1.65
ADC
Input Characteristics
Maximum Input Current
10 ADC, 5.0 VDC Out @ 36 VDC In
Input Stand-by Current
Vin = 48V, converter disabled
2.6
mADC
Input No Load Current (0 load
on the output)
Vin = 48V, converter enabled
40
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
4.950
5.000
5.050
VDC
±2
±5
mV
±2
±5
mV
Output Regulation
Over Line
Over Load
Output Voltage Range
Over line, load and temperature
5
Output Ripple and Noise - 25
MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
External Load Capacitance
Plus full load (resistive)
Output Current Range
4.925
5.075
45
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
10.5
PK
10,000
μF
10
ADC
12.5
14
ADC
20
30
A
5.3
Arms
0
Current Limit Inception
80
VDC
mVPK-
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
Co = 1 μF ceramic
200
mV
di/dt = 5 A/μs
Co = 450 μF tantalum + 1 μF ceramic
180
mV
400
μs
100% Load
87.0
%
50% Load
88.0
%
Settling Time to 1%
Efficiency
5
-40 ºC to 85 ºC.
tech.support@psbel.com
SQ48 DC-DC Series
25
Figure 5.0V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T10050 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 5.0V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T10050 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Figure 5.0V.3 Available load current vs. ambient air temperature
and airflow rates for SQ48S10050 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 5.0V.4 Available load current vs. ambient air temperature
and airflow rates for SQ48S10050 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
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SQ48 DC-DC Series
Fig. 5.0V.5: Efficiency vs. load current and input voltage for
SQ48T/S10050 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 5.0V.6: Efficiency vs. load current and ambient temperature
for SQ48T/S10050 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
Fig. 5.0V.7: Power dissipation vs. load current and input voltage
for SQ48T/S10050 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 5.0V.8: Power dissipation vs. load current and ambient
temperature for SQ48T/S10050 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
tech.support@psbel.com
SQ48 DC-DC Series
27
Fig. 5.0V.9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(2V/div.). Time scale: 2ms/div.
Fig. 5.0V.10: Turn-on transient at full rated load current (resistive)
plus 10,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (2V/div.).
Time scale: 5ms/div.
Fig. 5.0V.11: Output voltage response to load current stepchange (2.5A – 5A – 2.5A) at Vin = 48V. Top trace: output voltage
(200mV/div.). Bottom trace: load current (2A/div.). Current slew
rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.2 ms/div.
Fig. 5.0V.12: Output voltage response to load current stepchange (2.5A – 5A – 2.5A) at Vin = 48V. Top trace: output voltage
(200 mV/div.). Bottom trace: load current (2A/div.). Current slew
rate: 5 A/μs. Co = 450μF tantalum + 1μF ceramic. Time scale: 0.2
ms/div.
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SQ48 DC-DC Series
Fig.5.0V.13: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 5.0V.14: Test Setup for measuring input reflected ripple
currents, ic and is
Fig. 5.0V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 5.0V.14 for test setup. Time scale: 1μs/div.
Fig. 5.0V.16: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 5.0V.14 for test setup. Time scale: 1μs/div.
Fig. 5.0V.17: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 5.0V.18: Load current (top trace, 10A/div., 20 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48V. Bottom trace
(10A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
tech.support@psbel.com
SQ48 DC-DC Series
29
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 3.3 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Input Characteristics
Maximum Input Current
15 ADC, 3.3 VDC Out @ 36 VDC In
Input Stand-by Current
Input No Load Current (0 load
on the output)
Vin = 48V, converter disabled
2.6
1.6
mADC
ADC
Vin = 48V, converter enabled
42
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
Output Regulation
3.300
3.333
VDC
Over Line
±2
±5
mV
Over Load
±2
±5
mV
3.350
VDC
Output Voltage Range
Output Ripple and Noise - 25
MHz
bandwidth
External Load Capacitance
3.267
Over line, load and temperature6
3.250
Full load + 10 μF tantalum + 1 μF ceramic
30
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
15.75
PK
μF
15
ADC
18
20
ADC
30
40
A
5.3
Arms
0
Current Limit Inception
mVPK-
15,000
Plus full load (resistive)
Output Current Range
50
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
di/dt = 5 A/μs
Co = 1 μF ceramic
80
mV
Co = 450 μF tantalum + 1 μF ceramic
140
mV
100
μs
100% Load
89.5
%
50% Load
89.5
%
Settling Time to 1%
Efficiency
6
-40 ºC to 85 ºC.
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North America
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SQ48 DC-DC Series
Figure 3.3V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T15033 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 3.3V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T15033 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Figure 3.3V.3 Available load current vs. ambient air temperature
and airflow rates for SQ48S15033 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 3.3V.4 Available load current vs. ambient air temperature
and airflow rates for SQ48S15033 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
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SQ48 DC-DC Series
31
Fig. 3.3V.5: Efficiency vs. load current and input voltage for
SQ48T/S15033 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 3.3V.6: Efficiency vs. load current and ambient temperature
for SQ48T/S15033 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
Fig. 3.3V.7: Power dissipation vs. load current and input voltage
for SQ48T/S15033 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 3.3V.8: Power dissipation vs. load current and ambient
temperature for SQ48T/S15033 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
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32
SQ48 DC-DC Series
Fig. 3.3V.9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(2V/div.). Time scale: 2ms/div.
Fig. 3.3V.10: Turn-on transient at full rated load current (resistive)
plus 10,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (1V/div.).
Time scale: 2ms/div.
Fig. 3.3V.11: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.2 ms/div.
Fig. 3.3V.12: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 5 A/μs. Co = 450μF tantalum + 1μF ceramic. Time
scale: 0.2 ms/div.
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SQ48 DC-DC Series
33
Fig.3.3V.13: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 3.3V.14: Test Setup for measuring input reflected ripple
currents, ic and is
Fig. 3.3V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 3.3V.14 for test setup. Time scale: 1μs/div.
Fig. 3.3V.16: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 3.3V.14 for test setup. Time scale: 1μs/div.
Fig. 3.3V.17: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 3.3V.18: Load current (top trace, 10A/div., 20 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48V. Bottom trace
(20A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
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North America
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Asia-Pacific
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SQ48 DC-DC Series
34
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 2.5 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Input Characteristics
Maximum Input Current
15 ADC, 2.5 VDC Out @ 36 VDC In
Input Stand-by Current
Input No Load Current (0 load
on the output)
Vin = 48V, converter disabled
2.6
1.2
mADC
ADC
Vin = 48V, converter enabled
34
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
Output Regulation
2.500
2.525
VDC
Over Line
±2
±5
mV
Over Load
±2
±5
mV
2.538
VDC
Output Voltage Range
Output Ripple and Noise - 25
MHz
bandwidth
External Load Capacitance
2.475
Over line, load and temperature7
2.462
Full load + 10 μF tantalum + 1 μF ceramic
30
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
15.75
PK
μF
15
ADC
18
20
ADC
30
40
A
5.3
Arms
0
Current Limit Inception
mVPK-
15,000
Plus full load (resistive)
Output Current Range
50
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
di/dt = 5 A/μs
Co = 1 μF ceramic
120
mV
Co = 450 μF tantalum + 1 μF ceramic
120
mV
100
μs
100% Load
87.0
%
50% Load
87.5
%
Settling Time to 1%
Efficiency
7
-40 ºC to 85 ºC.
tech.support@psbel.com
SQ48 DC-DC Series
35
Figure 2.5V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T15025 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 2.5V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T15025 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Figure 2.5V.3 Available load current vs. ambient air temperature
and airflow rates for SQ48S15025 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 2.5V.4 Available load current vs. ambient air temperature
and airflow rates for SQ48S15025 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
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North America
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36
SQ48 DC-DC Series
Fig. 2.5V.5: Efficiency vs. load current and input voltage for
SQ48T/S15025 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 2.5V.6: Efficiency vs. load current and ambient temperature
for SQ48T/S15025 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
Fig. 2.5V.7: Power dissipation vs. load current and input voltage
for SQ48T/S15025 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 2.5V.8: Power dissipation vs. load current and ambient
temperature for SQ48T/S15025 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
tech.support@psbel.com
SQ48 DC-DC Series
37
Fig. 2.5V.9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(1V/div.). Time scale: 2ms/div.
Fig. 2.5V.10: Turn-on transient at full rated load current (resistive)
plus 10,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (1V/div.).
Time scale: 2ms/div.
Fig. 2.5V.11: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.2 ms/div.
Fig. 2.5V.12: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 5 A/μs. Co = 450μF tantalum + 1μF ceramic. Time
scale: 0.2 ms/div.
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38
SQ48 DC-DC Series
Fig. 2.5V.13: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 2.5V.14: Test Setup for measuring input reflected ripple
currents, ic and is
Fig. 2.5V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 2.5V.14 for test setup. Time scale: 1μs/div.
Fig. 2.5V.16: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 2.5V.14 for test setup. Time scale: 1μs/div.
Fig. 2.5V.17: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 2.5V.18: Load current (top trace, 20A/div., 20 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48V. Bottom trace
(20A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
tech.support@psbel.com
SQ48 DC-DC Series
39
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 2.0 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Input Characteristics
Maximum Input Current
15 ADC, 2.0 VDC Out @ 36 VDC In
Input Stand-by Current
Input No Load Current (0 load
on the output)
Vin = 48V, converter disabled
3
1.0
mADC
ADC
Vin = 48V, converter enabled
31
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
Output Regulation
2.000
2.02
VDC
Over Line
±2
±5
mV
Over Load
±2
±5
mV
2.030
VDC
Output Voltage Range
Output Ripple and Noise - 25
MHz
bandwidth
External Load Capacitance
1.98
Over line, load and temperature8
1.970
Full load + 10 μF tantalum + 1 μF ceramic
30
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
15.75
PK
μF
15
ADC
18
20
ADC
30
40
A
5.3
Arms
0
Current Limit Inception
mVPK-
15,000
Plus full load (resistive)
Output Current Range
50
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
di/dt = 5 A/μs
Co = 1 μF ceramic
80
mV
Co = 450 μF tantalum + 1 μF ceramic
60
mV
60
μs
100% Load
86.5
%
50% Load
87.0
%
Settling Time to 1%
Efficiency
8
-40 ºC to 85 ºC.
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
40
SQ48 DC-DC Series
Figure 2.0V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T15020 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 2.0V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T15020 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Figure 2.0V.3 Available load current vs. ambient air temperature
and airflow rates for SQ48S15020 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 2.0V.4 Available load current vs. ambient air temperature
and airflow rates for SQ48S15020 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
tech.support@psbel.com
SQ48 DC-DC Series
41
Fig. 2.0V.5: Efficiency vs. load current and input voltage for
SQ48T/S15020 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 2.0V.6: Efficiency vs. load current and ambient temperature
for SQ48T/S15020 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
Fig. 2.0V.7: Power dissipation vs. load current and input voltage
for SQ48T/S15020 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 2.0V.8: Power dissipation vs. load current and ambient
temperature for SQ48T/S15020 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
42
SQ48 DC-DC Series
Fig. 2.0V.9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(1V/div.). Time scale: 2ms/div.
Fig. 2.0V.10: Turn-on transient at full rated load current (resistive)
plus 10,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (1V/div.).
Time scale: 2ms/div.
Fig. 2.0V.11: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.2 ms/div.
Fig. 2.0V.12: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 5 A/μs. Co = 450μF tantalum + 1μF ceramic. Time
scale: 0.2 ms/div.
tech.support@psbel.com
SQ48 DC-DC Series
43
Fig. 2.0V.13: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 2.0V.14: Test Setup for measuring input reflected ripple
currents, ic and is
Fig. 2.0V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 2.0V.14 for test setup. Time scale: 1μs/div.
Fig. 2.0V.16: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 2.0V.14 for test setup. Time scale: 1μs/div.
Fig. 2.0V.17: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 2.0V.18: Load current (top trace, 20A/div., 20 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48V. Bottom trace
(20A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
SQ48 DC-DC Series
44
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 1.8 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Input Characteristics
Maximum Input Current
15 ADC, 1.8 VDC Out @ 36 VDC In
Input Stand-by Current
Input No Load Current (0 load
on the output)
Vin = 48V, converter disabled
2.6
0.9
mADC
ADC
Vin = 48V, converter enabled
29
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
Output Regulation
1.800
1.818
VDC
Over Line
±2
±4
mV
Over Load
±2
±5
mV
1.827
VDC
Output Voltage Range
Output Ripple and Noise - 25
MHz
bandwidth
External Load Capacitance
1.782
Over line, load and temperature9
1.773
Full load + 10 μF tantalum + 1 μF ceramic
30
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
15.75
PK
μF
15
ADC
18
20
ADC
30
40
A
5.3
Arms
0
Current Limit Inception
mVPK-
15,000
Plus full load (resistive)
Output Current Range
50
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
di/dt = 5 A/μs
Co = 1 μF ceramic
80
mV
Co = 450 μF tantalum + 1 μF ceramic
100
mV
100
μs
100% Load
85.5
%
50% Load
86.0
%
Settling Time to 1%
Efficiency
9
-40 ºC to 85 ºC.
tech.support@psbel.com
SQ48 DC-DC Series
45
Figure 1.8V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T15018 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 1.8V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T15018 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Figure 1.8V.3 Available load current vs. ambient air temperature
and airflow rates for SQ48S15018 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 1.8V.4 Available load current vs. ambient air temperature
and airflow rates for SQ48S15018 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
46
SQ48 DC-DC Series
Fig. 1.8V.5: Efficiency vs. load current and input voltage for
SQ48T/S15018 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.8V.6: Efficiency vs. load current and ambient temperature
for SQ48T/S15018 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
Fig. 1.8V.7: Power dissipation vs. load current and input voltage
for SQ48T/S15018 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.8V.8: Power dissipation vs. load current and ambient
temperature for SQ48T/S15018 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
tech.support@psbel.com
SQ48 DC-DC Series
47
Fig. 1.8V.9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(1V/div.). Time scale: 2ms/div.
Fig. 1.8V.10: Turn-on transient at full rated load current (resistive)
plus 10,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (1V/div.).
Time scale: 2ms/div.
Fig. 1.8V.11: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.2 ms/div.
Fig. 1.8V.12: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 5 A/μs. Co = 450μF tantalum + 1μF ceramic. Time
scale: 0.2 ms/div.
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
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BCD.00637_AB
Asia-Pacific
+86 755 298 85888
48
SQ48 DC-DC Series
Fig. 1.8V.13: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 1.8V.14: Test Setup for measuring input reflected ripple
currents, ic and is
Fig. 1.8V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 1.8V.14 for test setup. Time scale: 1μs/div.
Fig. 1.8V.16: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 1.8V.14 for test setup. Time scale: 1μs/div.
Fig. 1.8V.17: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 1.8V.18: Load current (top trace, 20A/div., 20 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48V. Bottom trace
(20A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
tech.support@psbel.com
SQ48 DC-DC Series
49
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 1.5 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Input Characteristics
Maximum Input Current
15 ADC, 1.5 VDC Out @ 36 VDC In
Input Stand-by Current
Input No Load Current (0 load
on the output)
Vin = 48V, converter disabled
2.6
0.75
mADC
ADC
Vin = 48V, converter enabled
25
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
Output Regulation
1.500
1.515
VDC
Over Line
±2
±4
mV
Over Load
±2
±4
mV
1.523
VDC
Output Voltage Range
Output Ripple and Noise - 25
MHz
bandwidth
External Load Capacitance
1.485
Over line, load and temperature10
1.477
Full load + 10 μF tantalum + 1 μF ceramic
30
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
15.75
PK
μF
15
ADC
18
20
ADC
30
40
A
5.3
Arms
0
Current Limit Inception
mVPK-
15,000
Plus full load (resistive)
Output Current Range
50
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
di/dt = 5 A/μs
Co = 1 μF ceramic
80
mV
Co = 450 μF tantalum + 1 μF ceramic
120
mV
100
μs
100% Load
84.5
%
50% Load
85.0
%
Settling Time to 1%
Efficiency
10
-40 ºC to 85 ºC.
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
50
SQ48 DC-DC Series
Figure 1.5V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T15015 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 1.5V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T15015 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Figure 1.5V.3 Available load current vs. ambient air temperature
and airflow rates for SQ48S15015 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 1.5V.4 Available load current vs. ambient air temperature
and airflow rates for SQ48S15015 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
tech.support@psbel.com
SQ48 DC-DC Series
51
Fig. 1.5V.5: Efficiency vs. load current and input voltage for
SQ48T/S15015 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.5V.6: Efficiency vs. load current and ambient temperature
for SQ48T/S15015 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
Fig. 1.5V.7: Power dissipation vs. load current and input voltage
for SQ48T/S15015 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.5V.8: Power dissipation vs. load current and ambient
temperature for SQ48T/S15015 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
52
SQ48 DC-DC Series
Fig. 1.5V.9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(0.5V/div.). Time scale: 2ms/div.
Fig. 1.5V.10: Turn-on transient at full rated load current (resistive)
plus 10,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (0.5V/div.).
Time scale: 2ms/div.
Fig. 1.5V.11: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.2 ms/div.
Fig. 1.5V.12: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 5 A/μs. Co = 450μF tantalum + 1μF ceramic. Time
scale: 0.2 ms/div.
tech.support@psbel.com
SQ48 DC-DC Series
53
Fig. 1.5V.13: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 1.5V.14: Test Setup for measuring input reflected ripple
currents, ic and is
Fig. 1.5V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 1.5V.14 for test setup. Time scale: 1μs/div.
Fig. 1.5V.16: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 1.5V.14 for test setup. Time scale: 1μs/div.
Fig. 1.5V.17: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 1.5V.18: Load current (top trace, 20A/div., 20 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48V. Bottom trace
(20A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
SQ48 DC-DC Series
54
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 1.2 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Input Characteristics
Maximum Input Current
15 ADC, 1.2 VDC Out @ 36 VDC In
Input Stand-by Current
Input No Load Current (0 load
on the output)
Vin = 48V, converter disabled
2.6
0.62
mADC
ADC
Vin = 48V, converter enabled
22
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPKPK
Output Characteristics
Output Voltage Set Point (no
load)
Output Regulation
1.200
1.212
VDC
Over Line
±1
±3
mV
Over Load
±1
±3
mV
1.218
VDC
Output Voltage Range
Output Ripple and Noise - 25
MHz
bandwidth
External Load Capacitance
1.188
Over line, load and temperature11
1.182
Full load + 10 μF tantalum + 1 μF ceramic
30
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
15.75
PK
μF
15
ADC
18
20
ADC
30
40
A
5.3
Arms
0
Current Limit Inception
mVPK-
15,000
Plus full load (resistive)
Output Current Range
50
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
di/dt = 5 A/μs
Co = 1 μF ceramic
90
mV
Co = 450 μF tantalum + 1 μF ceramic
120
mV
100
μs
100% Load
82.0
%
50% Load
83.0
%
Settling Time to 1%
Efficiency
11
-40 ºC to 85 ºC.
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SQ48 DC-DC Series
55
Figure 1.2V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T15012 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 1.2V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T15012 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Figure 1.2V.3 Available load current vs. ambient air temperature
and airflow rates for SQ48S15012 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 1.2V.4 Available load current vs. ambient air temperature
and airflow rates for SQ48S15012 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
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56
SQ48 DC-DC Series
Fig. 1.2V.5: Efficiency vs. load current and input voltage for
SQ48T/S15012 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.2V.6: Efficiency vs. load current and ambient temperature
for SQ48T/S15012 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
Fig. 1.2V.7: Power dissipation vs. load current and input voltage
for SQ48T/S15012 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.2V.8: Power dissipation vs. load current and ambient
temperature for SQ48T/S15012 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
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SQ48 DC-DC Series
57
Fig. 1.2V.9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(0.5V/div.). Time scale: 2ms/div.
Fig. 1.2V.10: Turn-on transient at full rated load current (resistive)
plus 10,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (0.5V/div.).
Time scale: 2ms/div.
Fig. 1.2V.11: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.2 ms/div.
Fig. 1.2V.12: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 5 A/μs. Co = 450μF tantalum + 1μF ceramic. Time
scale: 0.2 ms/div.
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North America
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Asia-Pacific
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58
SQ48 DC-DC Series
Fig. 1.2V.13: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 1.2V.14: Test Setup for measuring input reflected ripple
currents, ic and is
Fig. 1.2V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 1.2V.14 for test setup. Time scale: 1μs/div.
Fig. 1.2V.16: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 1.2V.14 for test setup. Time scale: 1μs/div.
Fig. 1.2V.17: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 1.2V.18: Load current (top trace, 20A/div., 20 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48V. Bottom trace
(20A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
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SQ48 DC-DC Series
59
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 1.0 VDC, unless otherwise specified.
PARAMETER
CONDITIONS/DESCRIPTION
MIN
TYP
MAX
UNITS
Input Characteristics
Maximum Input Current
15 ADC, 1.0 VDC Out @ 36 VDC In
Input Stand-by Current
Input No Load Current (0 load
on the output)
Input Reflected-Ripple Current
Vin = 48V, converter disabled
3
0.52
mADC
ADC
Vin = 48V, converter enabled
22
mADC
25MHz bandwidth
7.5
mAPK-PK
Output Characteristics
Output Voltage Set Point (no
load)
Output Regulation
1.000
1.010
VDC
Over Line
±1
±2
mV
Over Load
±1
±3
mV
1.015
VDC
50
mVPK-PK
Output Voltage Range
Output Ripple and Noise - 25
MHz
bandwidth
External Load Capacitance
0.990
Over line, load and temperature12
0.985
Full load + 10 μF tantalum + 1 μF ceramic
30
15,000
μF
15
ADC
18
20
ADC
30
40
A
5.3
Arms
Plus full load (resistive)
Output Current Range
0
Current Limit Inception
Non-latching
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
RMS Short-Circuit Current
Non-latching
15.75
Dynamic Response
Load Change 25% of Iout
Max, di/dt = 0.1 A/μs
di/dt = 5 A/μs
Co = 1 μF ceramic
90
mV
Co = 450 μF tantalum + 1 μF ceramic
140
mV
100
μs
100% Load
80.5
%
50% Load
81.0
%
Settling Time to 1%
Efficiency
12
-40 ºC to 85 ºC.
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
60
SQ48 DC-DC Series
Figure 1.0V.1 Available load current vs. ambient air temperature
and airflow rates for SQ48T15010 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 1.0V.2 Available load current vs. ambient air temperature
and airflow rates for SQ48T15010 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
Figure 1.0V.3 Available load current vs. ambient air temperature
and airflow rates for SQ48S15010 converter with D height pins
mounted vertically with Vin = 48V, air flowing from pin 3 to pin 1,
and maximum FET temperature ≤ 120°C.
Figure 1.0V.4 Available load current vs. ambient air temperature
and airflow rates for SQ48S15010 converter with D height pins
mounted horizontally with Vin = 48V, air flowing from pin 3 to pin
1, and maximum FET temperature ≤ 120°C.
tech.support@psbel.com
SQ48 DC-DC Series
61
Fig. 1.0V.5: Efficiency vs. load current and input voltage for
SQ48T/S15010 converter mounted vertically with air flowing from
pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.0V.6: Efficiency vs. load current and ambient temperature
for SQ48T/S15010 converter mounted vertically with Vin = 48V
and air flowing from pin 3 to pin 1 at a rate of 200LFM (1.0 m/s).
Fig. 1.0V.7: Power dissipation vs. load current and input voltage
for SQ48T/S15010 converter mounted vertically with air flowing
from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.0V.8: Power dissipation vs. load current and ambient
temperature for SQ48T/S15010 converter mounted vertically with
Vin = 48V and air flowing from pin 3 to pin 1 at a rate of 200LFM
(1.0m/s).
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
62
SQ48 DC-DC Series
Fig. 1.0V.9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48V, triggered via ON/OFF pin.
Top trace: ON/OFF signal 5V/div.). Bottom trace: output voltage
(0.5V/div.). Time scale: 2ms/div.
Fig. 1.0V.10: Turn-on transient at full rated load current (resistive)
plus 10,000 μF at Vin = 48V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5V/div.). Bottom trace: output voltage (0.5V/div.).
Time scale: 2ms/div.
Fig. 1.0V.11: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 0.1A/μs. Co = 1μF ceramic. Time scale: 0.2 ms/div.
Fig. 1.0V.12: Output voltage response to load current stepchange (3.75 A – 7.5 A – 3.75 A) at Vin = 48V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5A/div.). Current
slew rate: 5 A/μs. Co = 450μF tantalum + 1μF ceramic. Time
scale: 0.2 ms/div.
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SQ48 DC-DC Series
63
Fig. 1.0V.13: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10μF tantalum + 1 μF
ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 1.0V.14: Test Setup for measuring input reflected ripple
currents, ic and is
Fig. 1.0V.15: Input reflected ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48V. Refer to Fig. 1.0V.14 for test setup. Time scale: 1μs/div.
Fig. 1.0V.16: Input reflected ripple current, is (10 mA/div.), measured
through 10μH at the source at full rated full rated load current and
Vin= 48V. Refer to Fig. 1.0V.14 for test setup. Time scale: 1μs/div.
Fig. 1.0V.17: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost no
effect on current limit characteristic.
Fig. 1.0V.18: Load current (top trace, 20A/div., 20 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48V. Bottom trace
(20A/div., 1ms/div.) is an expansion of the on-time portion of the
top trace.
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+353 61 225 977
North America
+1 408 785 5200
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BCD.00637_AB
Asia-Pacific
+86 755 298 85888
64
SQ48 DC-DC Series
6.
tech.support@psbel.com
SQ48 DC-DC Series
65
HT
(MAX. HEIGHT)
CL
(MIN. CLEARANCE)
+0.000 [+0.00]
-0.038 [- 0.97]
+0.016 [+0.41]
-0.000 [- 0.00]
0.030 [0.77]
0.063 [1.60]
A
0.188 [4.77]
B
0.303 [7.69]
0.336 [8.53]
B
0.145 [3.68]
C
0.500 [12.70]
0.227 [5.77]
C
0.110 [2.79]
D
0.400 [10.16]
0.127 [3.23]
E
0.282 [7.16]
0.009 [0.23]
HEIGHT
OPTION
A
PAD/PIN CONNECTIONS
Pad/Pin #
Function
1
Vin (+)
2
ON/OFF
3
Vin (-)
4
Vout (-)
5
SENSE(-)
6
TRIM
7
SENSE(+)
8
Vout (+)
PL
PIN LENGTH
PIN
OPTION
±0.005 [±0.13]
SQE48S Platform Notes
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Gold over Nickel
Converter Weight: 0.66 oz [18.5 g]
Recommended Surface-Mount Pads:
Min. 0.080” X 0.112” [2.03 x 2.84]
Max. 0.092” X 0.124” [2.34 x 3.15]
SQE48T Platform Notes
All dimensions are in inches [mm]
Pins 1-3 and 5-7 are Ø 0.040” [1.02] with Ø 0.078” [1.98]
shoulder
Pins 4 and 8 are Ø 0.062” [1.57]
without shoulder
Pin Material: Brass
Pin Finish: Tin / Lead over Nickel or Matte Tin over
Nickel for “G” version
Converter Weight: 0.53 oz [15 g]
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
© 2016 Bel Power Solutions & Protection
BCD.00637_AB
Asia-Pacific
+86 755 298 85888
SQ48 DC-DC Series
66
7.
Product
Input
Series Voltage
SQ
48
OneEighth
Brick
Format
Mounting
Scheme
T
Rated Load
Current
15
012
15 15 A (1.0 –
3.3 V)
010 1.0 V
012 ⇒ 1.2 V
015 ⇒ 1.5 V
018 ⇒ 1.8 V
020 ⇒ 2.0 V
025 ⇒ 2.5 V
033 ⇒ 3.3 V
050 ⇒ 5.0 V
060 ⇒ 6.0 V
080 ⇒ 8.0 V
120 ⇒ 12.0 V
S
Surface
Mount
10 10 A (5.0 V)
T
Throughhole
05 5.3 A (8.0 V)
36-75 V
Output Voltage
08 8 A (6.0 V)
04 4 A (12.0 V)
-
ON/OFF
Logic
Maximum
Height [HT]
Pin Length
[PL]
Special
Features
N
B
A
0
SMT
0 ⇒ 0.00”
0 ⇒ STD
N
Negative
P
Positive
SMT
S ⇒ 0.273”
Through
hole
A ⇒ 0.303”
B ⇒ 0.336”
C ⇒ 0.500”
D ⇒ 0.400”
E ⇒ 0.282”
Through
hole
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
T⇒
Alternative
Trim
Option
(For 1.2 V,
1.0 V only)
Environmental
No Suffix
RoHS
lead-solderexemption
compliant
G RoHS
compliant for
all six
substances
The example above describes P/N SQ48T15012-NBA0: 36-75 V input, through-hole mounting, 15 A @ 1.2 V output, negative ON/OFF
logic, a maximum height of 0.336”, a through the board pin length of 0.188”, standard trim equations, and Eutectic Tin/Lead solder.
Please consult factory for the complete list of available options.
NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems, equipment
used in hazardous environments, or nuclear control systems.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date
manufactured. Specifications are subject to change without notice.
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