HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Features
Applications
Telecommunications
Data communications
Wireless communications
Servers, workstations
Benefits
Cost-effective, single board design with optional
attached baseplate for cold plate cooling
applications and enhanced power capability.
High efficiency – no heat sink required
RoHS lead-free solder and lead-solder-exempted
products are available
Delivers up to 25 A of output
(13.5 A @ 70 °C, 200 LFM)
Industry-standard half-brick pinout
Optional baseplate attachment
On-board input differential LC-filter
Startup into pre-biased load
No minimum load required
Dimensions: 2.40” x 2.28” x 0.50”
(61.0 mm x 57.9 mm x 12.7 mm)
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Fixed frequency operation
Remote output voltage sense
Fully protected with automatic recovery
Positive or negative logic ON/OFF option
Output voltage trim range: +10%/−20% with
industry-standard trim equations
High reliability: MTBF approx. 8.7 million hours,
calculated per Telcordia TR-332, Method I Case 1
Recognized to UL60950-1/CSA 22.2 No. 60950-1,
and TUV approved to IEC_EN60950-1
Designed to meet Class B conducted emissions per
FCC and EN55022 when used with external filter
All materials meet UL94, V-0 flammability rating
Description
The HBC48T25120 power module is an open frame half-brick DC-DC converter providing a regulated and isolated
output voltage of 12.0 VDC with an output current up to 25 A suitable for today’s Distributed Power Architecture
applications. It offers outstanding thermal performance in high temperature environments.
This performance is accomplished through the use of patented/patent-pending circuits, packaging, and processing
techniques to achieve ultra-high efficiency, excellent thermal management, and a low mechanical profile.
This low-body profile minimizes impedance to system airflow, thereby enhancing cooling for both upstream and
downstream devices. For extended cooling purposes, a baseplate option is available. Attaching a heat sink or cold
plate further enhances the unit’s capability. 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 HBC48T25120 converter provides an output that can be trimmed from –20%
to +10% of the nominal output voltage, thereby providing outstanding design flexibility.
.
MCD10127 Rev. 1.1, 09-Jun-10
Page 1 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Electrical Specifications
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vi n = 48 VDC, unless otherwise specified.
Parameter
Notes
Absolute Maximum Ratings
Input Voltage
Continuous
Transient (100 msec)
Min
Typ
Max
Units
0
75
100
VDC
VDC
Operating Ambient Temperature
Operating Temperature
Component (Tc)
Baseplate (Tb)
-40
85
°C
-40
-40
125
110
°C
°C
Storage Temperature
-55
125
°C
Isolation Characteristics
Input to Output Isolation
1500
VDC
Input to Case Isolation
1500
VDC
Output to Case Isolation
1500
Isolation Capacitance
VDC
2.5
Isolation Resistance
ηF
10
MΩ
Feature Characteristics
Switching Frequency
Output Voltage Trim Range1
360
Industry-std. equations
Remote Sense Compensation1
Percent of VOUT(NOM)
Output Overvoltage Protection
Overtemperature Shutdown
Latching
Non-latching
-20
117
Component (Tc)
Baseplate (Tb)
122
kHz
+10
%
+10
%
127
%
140
125
°C
°C
Auto-Restart Period
Applies to all protection features
200
ms
Turn-On Time from Vin
Time from UVLO to Vo=90%Vo-nom
50
ms
Turn-On Time from enable
Time from Enable to Vo=90%Vo-nom
4
ms
ON/OFF Control (Positive Logic)
Converter Off (logic low)
-20
0.8
VDC
Converter On (logic high)
2.4
20
VDC
ON/OFF Control (Negative Logic)
Converter Off (logic high)
2.4
20
VDC
Converter On (logic low)
-20
0.8
VDC
MCD10127 Rev. 1.1, 09-Jun-10
Page 2 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Electrical Specifications (continued)
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
36
48
75
VDC
Turn-on Threshold
33
34
35
VDC
Turn-off Threshold
31
32
33
VDC
100
VDC
Input Characteristics
Operating Input Voltage Range
Input Under Voltage Lockout
Non-latching
Input Voltage Transient
100 ms
Maximum Input Current
12 VDC Out @ 25 ADC, Vin= 36 VDC
Input Stand-by Current
Vin = 48 V, converter disabled
3
Input No Load Current (0 load on the output)
Vin = 48 V, converter enabled
75
mADC
Input Reflected-Ripple Current
25 MHz bandwidth
20
mAPK-PK
Input Voltage Ripple Rejection
120 Hz
65
dB
10
ADC
mADC
Output Characteristics
Output Voltage Set Point (no load)
11.88
12.00
12.12
VDC
±4
±10
mV
Output Regulation
Over Line
Over Load
±4
Over line, load and temperature 2
Output Voltage Range
11.76
Output Ripple and Noise – 25 MHz bandwidth Full load, Co = 10 µF (tant.) + 1 µF (cer.)
External Load Capacitance
75
Plus full load (resistive)
Output Current Range
0
27.5
30
±10
mV
12.24
VDC
200
mVPK-PK
15,000
µF
25
ADC
33.5
ADC
Current Limit Inception
Non-latching
Peak Short-Circuit Current
Non-latching, Short = 10 mΩ
28
A
RMS Short-Circuit Current
Non-latching
5
ARMS
Co = 1 µF (ceramic)
50
mV
Co = 15,000 µF (OSCON)
120
mV
30
µs
100% Load
93
%
50% Load
95
%
Dynamic Response
Load Change 50%-75%-50%, di/dt = 0.1 A/µs
di/dt = 1 A/µs
Settling Time to 1%
Efficiency
Additional Notes:
.
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-up should not
exceed 10% of VOUT(NOM).
2
Operating ambient temperature range of -40 ºC to 85 ºC for converter.
MCD10127 Rev. 1.1, 09-Jun-10
Page 3 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Operations
Input and Output Impedance
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 100 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 15,000 µF on the
output.
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.
Remote Sense (Pins 6 and 8)
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 6) and SENSE(+) (Pin 8) pins should
be connected at the load or at the point where
regulation is required (see Fig. B).
Additionally, see the EMC section of this data sheet
for discussion of other external components which
may be required for control of conducted emissions.
ON/OFF (Pin 2)
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 and
negative logic, with both referenced to Vin(-). A
typical connection is shown in Fig. A.
VIN (+)
VOUT (+)
ON/OFF
SENSE (+)
(Top View)
VIN
Rw
TRIM
CASE
SENSE (-)
VIN (-)
VOUT (-)
Rload
Rw
Fig. B: Remote sense circuit configuration.
VIN (+)
VOUT (+)
ON/OFF
SENSE (+)
(Top View)
VIN
CAUTION
TRIM
CASE
SENSE (-)
VIN (-)
VOUT (-)
Rload
CONTROL
INPUT
Fig. A: 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 the 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 5 VDC
through a resistor. A properly de-bounced
mechanical switch, open-collector transistor, or FET
can be used to drive the input of the ON/OFF pin.
MCD10127 Rev. 1.1, 09-Jun-10
If remote sensing is not utilized, the SENSE(-) pin must be
connected to the Vout(-) pin (Pin 5), and the SENSE(+) pin must
be connected to the Vout(+) pin (Pin 9) 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.
The converter’s output overvoltage protection (OVP)
circuitry 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.
Page 4 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
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.
VIN (+)
VOUT (+)
ON/OFF
SENSE (+)
(Top View)
VIN
TRIM
CASE
SENSE (-)
VIN (-)
VOUT (-)
RT-INCR
Rload
Fig. C: Configuration for increasing output voltage.
Output Voltage Adjust /TRIM (Pin 7)
The output voltage can be adjusted up 10% or down
20% relative to the rated output voltage by the
addition of an externally connected resistor. (Trim up
to 10% at full load is guaranteed at Vin ≥ 40V.)
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(-) pin.
To increase the output voltage, refer to Fig. C. A trim
resistor, RT-INCR, should be connected between the
TRIM (Pin 7) and SENSE(+) (Pin 8), with a value of:
To decrease the output voltage (Fig. D), a trim
resistor, RT-DECR, should be connected between the
TRIM (Pin 7) and SENSE(-) (Pin 6), with a value of:
RTDECR
100
2
|Δ|
[kΩ]
where,
RTDECR Required value of trim-down resistor [kΩ]
and Δ is defined above.
Note:
RTINCR
VONOM (100 Δ) (100 2Δ)
1.225Δ
Δ
The above equations for calculation of trim resistor values match
those typically used in conventional industry-standard half-bricks.
[kΩ]
VIN (+)
VOUT (+)
ON/OFF
SENSE (+)
where,
RTINCR Required value of trim-up resistor [kΩ]
VONOM Nominal value of output voltage [V]
(VO -REQ VO -NOM)
Δ
X 100
VO -NOM
(Top View)
VIN
TRIM
CASE
SENSE (-)
VIN (-)
VOUT (-)
RT-DECR
Rload
[%]
Fig. D: Configuration for decreasing output voltage.
VOREQ Desired (trimmed) output voltage [V].
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.
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 110% 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.
MCD10127 Rev. 1.1, 09-Jun-10
Page 5 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Protection Features
Output Overvoltage Protection (OVP)
Input Undervoltage Lockout (UVLO)
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.
Output Overcurrent Protection (OCP)
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 60%
of the nominal value of output voltage, the converter
will shut down.
Once the converter has shut down, it will attempt to
restart nominally every 200 ms with a typical 3-5%
duty cycle. The attempted restart will continue
indefinitely until the overload or short circuit
conditions are removed or the output voltage rises
above 60% 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.
The converter will shut down if the output voltage
across Vout(+) (Pin 9) and Vout(-) (Pin 5) exceeds
the threshold of the OVP circuitry. The OVP circuitry
contains its own reference voltage, independent of
the output voltage regulation loop. Once the
converter has shut down, it will latch off. The latch
can be reset by toggling the enable pin OFF then ON
or by recycling the input voltage.
Overtemperature Protection (OTP)
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.
Safety Requirements
The converters meet North American and
International safety regulatory requirements per
UL60950-1 and EN60950-1. 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. A 15 Amp fuse is recommended for use
with this product.
The HBC48T25120 converter is 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 value above.
MCD10127 Rev. 1.1, 09-Jun-10
Page 6 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Startup Information (using negative ON/OFF)
Scenario #1: Initial Startup From Bulk Supply
ON/OFF function enabled, converter started via application
of VIN. See Figure E.
Time
Comments
t0
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 (after 50ms turn-on delay).
t3
Converter VOUT reaches 100% of nominal value.
For this example, the total converter startup time (t3- t1) is
typically 54 ms.
Fig. E: Startup scenario #1.
Scenario #2: Initial Startup Using ON/OFF Pin
With VIN previously powered, converter started via
ON/OFF pin. See Figure F.
Time
Comments
t0
VINPUT at nominal value.
t1
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.
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 G.
Time
Comments
t0
VIN and VOUT are at nominal values; ON/OFF pin
ON.
t1
ON/OFF pin arbitrarily disabled; converter output
falls to zero; turn-on inhibit delay period (200 ms
typical) is initiated, and ON/OFF pin action is
internally inhibited.
t2
ON/OFF pin is externally re-enabled.
If (t2- t1) ≤ 200 ms, external action of
ON/OFF pin is locked out by startup inhibit
timer.
If (t2- t1) > 200 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 F.
t4
End of converter turn-on delay.
t5
Converter VOUT reaches 100% of nominal value.
For the condition, (t2- t1) ≤ 200 ms, the total converter
startup time (t5- t2) is typically 204 ms. For (t2- t1) > 200 ms,
startup will be typically 4 ms after release of ON/OFF pin.
MCD10127 Rev. 1.1, 09-Jun-10
Page 7 of 16
Fig. F: Startup scenario #2.
Fig. G: Startup scenario #3.
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Characterization
General Information
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 horizontal mountings,
efficiency, startup and shutdown parameters, output
ripple and noise, transient response to load stepchange, overload, and short circuit.
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Fig. 1 and Fig. 2 for horizontal
converter mountings, with and without baseplate
option. Ambient temperature was varied between 25
°C and 85 °C, with airflow rates from 30 to 400 LFM
(0.15 to 2.0 m/s). For each set of conditions, the
maximum load current was defined as the lowest of:
The following pages contain specific plots or
waveforms associated with the converter. Additional
comments for specific data are provided below.
(i)
Test Conditions
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.
The lack of metallization 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 derating
temperatures in the application. Thermographic
imaging is preferable; if this capability is not
available, then thermocouples may be used. The use
of AWG #40 thermocouples is recommended to
ensure measurement accuracy. Careful routing of
the thermocouple leads will further minimize
measurement error. Refer to Fig. H and Fig. I for the
optimum thermocouple locations.
The output current at which any FET junction
temperature does not exceed a maximum
specified temperature of 125 °C as indicated by
a thermocouple measurement, or
(ii) The output current at which the base plate
temperature does not exceed a maximum
specified temperature of 110 °C as indicated by
thermocouple measure, or
(iii) The nominal rating of the converter (25 A).
During normal operation, derating curves with
maximum FET temperature less or equal to 125 °C
should not be exceeded. Temperature at the
thermocouple location shown in Fig. H and I should
not exceed 125 °C and 110°C respectively in order
to operate inside the derating curves.
Efficiency
Fig. 3 shows the efficiency vs. load current plot for
an ambient temperature of 25 ºC, airflow rate of 300
LFM (1.5 m/s) with horizontal mounting and input
voltages of 36 V, 48 V and 72 V. Also, a plot of
efficiency vs. load current, as a function of ambient
temperature with Vin = 48 V, airflow rate of 200 LFM
(1 m/s) with vertical mounting is shown in Fig. 4.
Power Dissipation
Fig. 5 shows the power dissipation vs. load current
plot for Ta = 25 ºC, airflow rate of 300 LFM (1.5 m/s)
with vertical mounting and input voltages of 36 V, 48
V and 75 V. Also, a plot of power dissipation vs. load
current, as a function of ambient temperature with
Vin = 48 V, airflow rate of 200 LFM (1 m/s) with
vertical mounting is shown in Fig. 6.
Startup
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 Figs. 7-8, respectively.
MCD10127 Rev. 1.1, 09-Jun-10
Page 8 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Dynamic Load Response
Figs. 9-10 capture the converter’s loop response
when subjected to a step load change of 50% load to
75% load to 50% load. Two load slew rates are
shown with minimal and maximum external
capacitive loading conditions.
Temperature Reference Information
Tc
Ripple and Noise
Fig. 11 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 12. The
corresponding waveforms are shown in Figs. 13-14.
Fig. H: Tc Reference Point Location (w/o Baseplate)
Output Current Limiting
Fig. 15 shows the output load current behavior.
Fig. 16 illustrates the converter’s response to a
shorted output condition.
0.36"
Electromagnetic Compatibility (EMC)
0.88"
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, Power-One 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.
1
2
9
8
Tb
3
7
6
4
5
Top View
Fig. I: Tb Reference Point Location (w/ Baseplate)
With the addition of a simple external filter, the
HBC48T25120 converter will pass the requirements
of Class B conducted emissions per EN55022 and
FCC requirements. Please contact Power-One
Applications Engineering for details of this testing.
MCD10127 Rev. 1.1, 09-Jun-10
Page 9 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Characterization (con’t)
Output Current Derating, f ( (TA & Airflow)
Output Derating Current
Output Derating Current
28
28
24
Output Current (A)
Output Current (A)
24
20
16
12
400 LFM
300 LFM
200 LFM
100 LFM
30 LFM
8
4
16
12
400 LFM
300 LFM
200 LFM
100 LFM
30 LFM
8
4
0
0
25
20
40
55
70
25
85
40
Fig. 1 : Available load current vs. ambient air
temperature and airflow rates for single board
converter mounted horizontally with air flowing from
pin 4 to pin 1, MOSFET junction temperature ≤ 125
°C, Vin = 48 V.
55
70
85
Ambient Temperature (C)
Ambient Temperature (C)
Fig. 2: Available load current vs. ambient air
temperature and airflow rates for converter with
baseplate mounted horizontally with air flowing from
pin 4 to pin 1, baseplate temperature ≤ 110 °C, Vin =
48 V.
Efficiency, f ( Load Current & Vin)
0.96
0.96
0.94
Efficiency
Efficiency
0.92
0.88
0.92
0.9
0.84
0.8
40C
55C
70C
0.88
36V
48V
75V
0.86
0
0.76
0
5
10
15
20
25
30
Load Current [A]
Fig. 3: Efficiency vs. load current and input voltage
for converter mounted vertically with air flowing from
pin 4 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta =
25 °C.
MCD10127 Rev. 1.1, 09-Jun-10
5
10
15
20
25
30
Iout [A]
Fig. 4: Efficiency vs. load current and ambient
temperature for converter mounted vertically with Vin
= 48 V and air flowing from pin 4 to pin 1 at a rate of
200 LFM (1.0 m/s).
Page 10 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
30
30
25
25
Power Displation [W]
Power Dissipation [W]
Power Dissipation, f ( (Load Current & Vin)
20
15
10
36V
48V
75V
5
20
15
10
40C
55C
70C
5
0
0
0
5
10
15
20
Load Current [A]
25
0
30
Fig. 5: Power dissipation vs. load current and input
voltage for converter mounted vertically with air
flowing from pin 4 to pin 1 at a rate of 300 LFM (1.5
m/s) and Ta = 25 °C.
5
10
15
20
25
30
Iout [A]
Fig. 6: Power dissipation vs. load current and
ambient temperature for converter mounted vertically
with Vin = 48 V and air flowing from pin 4 to pin 1 at
a rate of 200 LFM (1.0 m/s).
Vo Startup
Fig. 7: Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (5 V/div.).
Time scale: 5 ms/div.
MCD10127 Rev. 1.1, 09-Jun-10
Fig. 8: Turn-on transient at full rated load current
(resistive) plus 15,000 µF at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.).
Bottom trace: output voltage (5 V/div.). Time scale: 5
ms/div.
Page 11 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Dynamic Load Response
Fig. 9: Output voltage response to load current
stepchange (12.5 A – 18.75 A – 12.5 A) at Vin = 48
V. Top trace: output voltage (20 mV/div.). Bottom
trace: load current (10 A/div.). Current slew rate: 0.1
A/µs. Co = 10uF Tantalum + 1 µF ceramic. Time
scale: 0.2 ms/div.
Fig. 10: Output voltage response to load current
stepchange (12.5 A – 18.75 A – 12.5 A) at Vin = 48
V. Top trace: output voltage (20 mV/div.). Bottom
trace: load current (10 A/div.). Current slew rate: 1
A/µs. Co = 15,000 uF OSCON + 1 µF ceramic. Time
scale: 0.2 ms/div.
Output Ripple
Module
Fig. 11: Output voltage ripple (20 mV/div.) at full
rated load current into a resistive load with Co = 10
µF tantalum + 1 µF ceramic and Vin = 48 V. Time
scale: 1 µs/div.
MCD10127 Rev. 1.1, 09-Jun-10
Fig. 12: Test setup for measuring input reflected
ripple currents, ic and is.
Page 12 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Input Reflected Ripple Current
Fig. 13: Input reflected ripple current, ic (200
mA/div.), measured at input terminals at full rated
load current and Vin = 48 V. Refer to Fig. 12 for test
setup. Time scale: 1 µs/div.
Fig. 14: Input reflected ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated
load current and Vin = 48 V. Refer to Fig. 12 for test
setup. Time scale: 1 µs/div.
Output Current Limiting
14
12
Vout [V]
10
8
6
4
2
0
0
5
10
15
20
25
30
35
Iout [A]
Fig. 15: Output voltage vs. load current showing
current limit point and converter shutdown point.
Input voltage has almost no effect on current limit
characteristic.
MCD10127 Rev. 1.1, 09-Jun-10
Fig. 16: Load current (top trace, 20 A/div., 50
ms/div.) into a 10 mΩ short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div., 2 ms/div.) is an
expansion of the on-time portion of the top trace.
Page 13 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Conducted EMI, Input Lines
The following conducted EMI filter configuration and
component values are offered as a guideline to assist in
designing an effective filter solution in the customer’s
application. Many factors can affect overall EMI
performance; such as layout, wire routing and load
characteristics, among others. As a result, the final circuit
configuration and component values may differ from that
below.
Fig. 19: Conducted EMI Scan of the HBC48T25120
(w/ Input filter components per table above.)
Test conditions: Vin = 48 Vdc, Io = 80% rated (300 Watts)
Test Specification: (CISPR-22) NE55022 Class B (Peak Detect)
Ref. Des
Description
Manufacturer
C2
3.3 µF @100V MLC
AVX or Equivalent
100 µF @ 100V Alum.
Electrolytic
10,000 pF @ 1,000V
MLC
F4810 Input Filter
Module
Not used
Panasonic NGH
Series or Equiv.
C7, 8, 9
C5, 6,
C10, 11
F1
C1
AVX or Equivalent
Power-One
Fig. 18: EMI Filter Configuration & Component List
MCD10127 Rev. 1.1, 09-Jun-10
Page 14 of 16
www.power-one.com
HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Physical Information
Figure J: HBC48T25120-xCx0
(w/o Baseplate)
Figure K: HBC48T25120-xCxB
(w/ Baseplate)
HBC48T25120 Platform Notes
Pad/Pin Connections
Pad/Pin #
1
2
3
4
5
6
7
8
9
Function
Vin (+)
ON/OFF
Case (B Option)
Vin (-)
Vout (-)
SENSE(-)
TRIM
SENSE(+)
Vout (+)
MCD10127 Rev. 1.1, 09-Jun-10
All dimensions are in inches [mm]
Pins 1-4 and 6-8 are Ø 0.040” [1.02] with Ø 0.078”
[1.98] shoulder
Pins 5 and 9 are Ø 0.080” [2.03] without shoulder
Pin Material & Finish: CDA 360 (brass)
with 200-300 u" matte SN over
100-150 u" Ni
Converter Weight: 2 oz [56.7 g] (stand alone)
Converter Weight: 3 oz [85 g] (Heat sink
mountable)
Tolerances: (Unless otherwise indicated)
x.xxx in. +/- .010 [x.xx mm +/- 0.25]
x.xx in. +/- .020 [x.x mm +/- 0.5]
Page 15 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Converter Part Number Ordering Information
Height
Option
C
HT
(Max. Height)
C ±0.020
[+0.5]
0.50 [12.7]
CL
(Min. Clearance)
+0.016 [+0.41]
-0.000 [- 0.00]
0.035 [0.89]
Product
Series
Input
Voltage
Mounting
Scheme
Rated
Load
Current
Output
Voltage
HBC
48
T
25
120
HalfBrick
Format
36-75 V
T
Throughhole
±0.005 [±0.13]
A
B
-
0.188 [4.78]
0.145 [3.68]
ON/OFF
Logic
Maximum
Height [HT]
Pin
Length
[PL]
Special
Features
N
C
A
0
N
Negative
25 A
PL
Pin Length
Pin
Option
120 12 V
P
Positive
Through
hole
Through
hole
C 0.50”
A 0.188”
B 0.145”
0 Std.
B Baseplate
Environmental
No Suffix
RoHS leadsolder
exemption
compliant
G RoHS
lead-free
solder
compliant
The example above describes P/N HBC48T25120-NCA0: 36-75 V input, through-hole mounting, 25 A @ 12 V output, negative ON/OFF logic,
1
a maximum height of 0.50”, a through the board pin length of 0.188”, a single board (no baseplate), and Eutectic Tin/Lead solder . Please
consult factory for the complete list of available options.
1
[suffix option –xxxx_] The solder exemption is for customers choosing to elect the exemptions for lead in solders for servers, storage and
storage array systems, and network infrastructure equipment for switching, signaling, transmission, and network management for
telecommunications.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical
components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written
consent of the respective divisional president of Power-One, Inc.
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.
MCD10127 Rev. 1.1, 09-Jun-10
Page 16 of 16
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