• RoHS lead-free solder and lead-solder-exempted products
are available
• Delivers up to 10 A (55 W)
• Extended input range 9.6 to 14 VDC
• No derating up to 85 C (70 °C for 5 VDC)
• Surface-mount package
• Industry-standard footprint and pinout
• Small size and low-profile: 1.30” x 0.53” x 0.314”
(33.02 x 13.46 x 7.98 mm)
• Weight: 0.22 oz [6.12 g]
• Co-planarity < 0.003", maximum
• Synchronous Buck Converter topology
• Start-up into pre-biased output
• No minimum load required
• Programmable output voltage via external resistor
• Operating ambient temperature: -40 °C to 85 °C
• Remote output sense
• Remote ON/OFF (positive or negative)
• Fixed-frequency operation
• Auto-reset output overcurrent protection
• Auto-reset overtemperature protection
• High reliability, MTBF approx. 27.2 million hours
calculated per Telcordia TR-332, Method I Case 1
• All materials meet UL94, V-0 flammability rating
• Safety approved to UL/CSA 62368-1 and
EN/IEC 62368-1
Bel Power Solutions point-of-load converters are
recommended for use with regulated bus converters in an
Intermediate Bus Architecture (IBA). The YS12S10 nonisolated DC-DC converter delivers up to 10 A of output
current in an industry-standard surface-mount package.
Operating from a 9.6 to 14 VDC input, the YS12S10
converters are ideal choices for Intermediate Bus
Architectures where Point-of-Load (POL) power delivery
is generally a requirement. The converters provide an
extremely tight regulated, programmable output voltage
of 0.7525 to 5.5 VDC.
The YS12S10 converters provide exceptional thermal
performance, even in high temperature environments with
minimal airflow. No derating is required up to 85 C (up to
70 C for 5 VDC output), even without airflow at natural
convection. This performance is accomplished through
the use of advanced circuitry, packaging, and processing
techniques to achieve a design possessing ultra-high
efficiency, excellent thermal management, and a very
low-body profile.
The low-body profile and the preclusion of heat sinks
minimize impedance to system airflow, thus enhancing
cooling for both upstream and downstream devices. The
use of 100% automation for assembly, coupled with
advanced power electronics, and thermal design, results
in a product with extremely high reliability.
▪
▪
▪
▪
▪
Intermediate Bus Architectures
Telecommunications
Data communications
Distributed Power Architectures
Servers, workstations
▪
▪
▪
▪
▪
▪
High efficiency – no heat sink required
Reduces total solution board area
Tape and reel packing
Compatible with pick & place equipment
Minimizes part numbers in inventory
Low cost
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 12 VDC, Vout = 0.7525 – 5.5 V, unless otherwise specified.
PARAMETER
NOTES
MIN
Continuous
TYP
MAX
UNITS
Absolute Maximum Ratings
Input Voltage
-0.3
15
VDC
Operating Ambient Temperature
-40
85
°C
Storage Temperature
-55
125
°C
5.5
VDC
0.5
VDC
Feature Characteristics
Switching Frequency
Output Voltage Trim Range1
300
By external resistor, See Trim Table 1
0.7525
Remote Sense Compensation1
Turn-On Delay Time
Full resistive load
With Vin (Converter Enabled, then Vin applied) From Vin = Vin(min) to Vo = 0.1* Vo(nom)
With Enable (Vin = Vin(nom) applied, then enabled) From enable to Vo = 0.1*Vo(nom)
Rise time2 (Full resistive load)
kHz
From 0.1*Vo(nom) to 0.9*Vo(nom)
3
ms
3
ms
4
ms
ON/OFF Control (Positive Logic) 3
Converter Off
-5
0.8
VDC
Converter On
2.4
Vin
VDC
Converter Off
2.4
Vin
VDC
Converter On
-5
0.8
VDC
14
VDC
ON/OFF Control (Negative Logic)3
Input Characteristics
Operating Input Voltage Range
9.6
12
Input Under Voltage Lockout
Turn-on Threshold
9.0
VDC
Turn-off Threshold
8.5
VDC
Maximum Input Current
10 ADC Out @ 9.6 VDC In
VOUT = 5.0 VDC
5.5
ADC
VOUT = 3.3 VDC
3.7
ADC
VOUT = 2.5 VDC
2.8
ADC
VOUT = 2.0 VDC
2.3
ADC
VOUT = 1.8 VDC
2.1
ADC
VOUT = 1.5 VDC
1.8
ADC
VOUT = 1.2 VDC
1.5
ADC
VOUT = 1.0 VDC
1.3
ADC
VOUT = 0.7525 VDC
1.1
ADC
Input Stand-by Current (Converter disabled)
Input No Load Current (Converter enabled)
Input Reflected-Ripple Current - is
5
mA
VOUT = 5.0 VDC
76
mA
VOUT = 3.3 VDC
60
mA
VOUT = 2.5 VDC
45
mA
VOUT = 2.0 VDC
41
mA
VOUT = 1.8 VDC
38
mA
VOUT = 1.5 VDC
35
mA
VOUT = 1.2 VDC
33
mA
VOUT = 1.0 VDC
30
mA
VOUT = 0.7525 VDC
28
mA
VOUT = 5.0 VDC
36
mAP-P
VOUT = 3.3 VDC
34
mAP-P
VOUT = 2.5 VDC
32
mAP-P
VOUT = 2.0 VDC
31
mAP-P
See Fig. D for setup. (BW = 20 MHz)
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Input Voltage Ripple Rejection
VOUT = 1.8 VDC
30
mAP-P
VOUT = 1.5 VDC
29
mAP-P
VOUT = 1.2 VDC
26
mAP-P
VOUT = 1.0 VDC
23
mAP-P
VOUT = 0.7525 VDC
20
mAP-P
120 Hz
72
dB
Output Characteristics
Output Voltage Set Point (no load)
-1.5
Vout
+1.5
%Vout
Output Regulation4
Over Line
Over Load
Output Voltage Range
(Over all operating input voltage, resistive load
and temperature conditions until end of life )
Output Ripple and Noise – 20 MHz bandwidth
Full resistive load
1
2
mV
From no load to full load
5
12
mV
-2.5
+2.5
%Vout
Over line, load and temperature (Fig. D)
Peak-to-Peak
VOUT = 1.0 VDC
10
20
mVP-P
Peak-to-Peak
VOUT = 5.0 VDC
25
40
mVP-P
Min ESR > 1mΩ
1,000
μF
Min ESR > 10 mΩ
5,000
μF
10
ADC
External Load Capacitance
Plus full load (resistive)
Output Current Range
0
Output Current Limit Inception (IOUT)
Output Short-Circuit Current
Short = 10 mΩ, continuous
Dynamic Response
Iout step from 5 A to 10 A with di/dt = 5 A/μs
Co = 10 μF ceramic. + 1 μF ceramic
Settling Time (VOUT < 10% peak deviation)
Iout step from 10 A to 5 A with di/dt = -5 A/μs
20
ADC
3
Arms
150/(1805)
mV
30
µs
Co = 10 μF ceramic + 1 μF ceramic
150/(1805)
mV
Settling Time (VOUT < 10% peak deviation)
Iout step from 5 A to 10 with di/dt = 5 A/μs
30
µs
Co = 330 μF polymer capacitors
100/(1205)
mV
Settling Time (VOUT < 10% peak deviation)
Iout step from 10 A to 5 A with di/dt = -5 A/μs
55
µs
Co = 330 μF polymer capacitors
100/(1205)
mV
55
µs
VOUT = 5.0 VDC
95.0
%
VOUT = 3.3 VDC
94.0
%
VOUT = 2.5 VDC
93.0
%
VOUT = 2.0 VDC
91.5
%
VOUT = 1.8 VDC
90.5
%
VOUT = 1.5 VDC
89.5
%
VOUT = 1.2 VDC
87.5
%
VOUT = 1.0 VDC
86.0
%
VOUT = 0.7525 VDC
84.0
%
Settling Time (VOUT < 10% peak deviation)
Efficiency
Full load (10 A)
Notes:
1
The output voltage should not exceed 5.5V.
2
Note that start-up time is the sum of turn-on delay time and rise time.
3
The converter is on if ON/OFF pin is left open.
4
Trim resistor connected across the GND and TRIM pins of the converter.
5
For VOUT = 5.0 VDC only. See the waveforms section for dynamic response and settling time for different output voltages.
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Input and Output Impedance
The YS12S10 converter should be connected via a low impedance to the DC power source. 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. It is recommended to use decoupling capacitors (minimum 47 μF) placed as close as possible to the
converter’s input pins in order to ensure stability of the converter and reduce input ripple voltage. Internally, the
converter has 20 μF (low ESR ceramics) of input capacitance.
In a typical application, low - ESR tantalum or POS capacitors will be sufficient to provide adequate ripple voltage
filtering at the input of the converter. However, very low ESR ceramic capacitors
47 to 100 μF are recommended at the input of the converter in order to minimize the input ripple voltage. They should
be placed as close as possible to the input pins of the converter.
The YS12S10 has been designed for stable operation with or without external capacitance. Low ESR ceramic
capacitors placed as close as possible to the load (minimum 47 μF) are recommended for better transient
performance and lower output voltage ripple.
It is important to keep low resistance and low inductance PCB traces for connecting your load to the output pins of
the converter. This is required to maintain good load regulation since the converter does not have a SENSE pin for
compensating voltage drops associated with the power distribution system on your PCB.
ON/OFF (Pin 1)
The ON/OFF pin (Pin 1) is used to turn the power converter on or off remotely via a system signal. There are two
remote control options available, positive logic (standard option) and negative logic, with both are referenced to GND
(Pin 5). The typical connections are shown in Fig. A.
The positive logic version turns the converter on when the ON/OFF pin is at a logic high or left open, and turns the
converter off when at a logic low or shorted to GND.
The negative logic version turns the converter on when the ON/OFF pin is at a logic low or left open, and turns the
converter off when the ON/OFF pin is at a logic high or connected to Vin.
Vin
R*
Y-Series
Converter
SENSE
(Top View)
ON/OFF
Vout
Vin
Rload
GND
TRIM
CONTROL
INPUT
R* is for negative logic option only
Fig. A: Circuit configuration for ON/OFF function.
The ON/OFF pin is internally pulled up to Vin for a positive logic version, and pulled down for a negative logic version.
A TTL or CMOS logic gate, open-collector (open-drain) transistor can be used to drive the ON/OFF pin. When using
open-collector (open-drain) transistor with a negative logic option, add a pull-up resistor (R*) of 75 kΩ to Vin as shown
in Fig. A.
This device must be capable of:
sinking up to 0.2 mA at a low level voltage of 0.8 V
sourcing up to 0.25 mA at a high logic level of 2.3 to 5 V
sourcing up to 0.75 mA when connected to Vin.
-
Remote Sense (Pin 2)
The remote sense feature of the converter compensates for voltage drops occurring only between Vout pin (Pin 4) of
the converter and the load. The SENSE (Pin 2) pin should be connected at the load or at the point where regulation is
required (see Fig. B). There is no sense feature on the output GND return pin, where the solid ground plane should
provide a low voltage drop.
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Vin
Y-Series
Converter
SENSE
(Top View)
Rw
ON/OFF
Vout
GND
TRIM
Vin
Rload
Rw
Fig. B: Circuit configuration for ON/OFF function.
If remote sensing is not required, the SENSE pin must be connected to the Vout pin (Pin 4) 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 value.
Because the sense lead carries minimal current, large traces on the end-user board are not required. However, sense
trace should be located close to a ground plane to minimize system noise and ensure the optimum performance.
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 up to 0.5 V 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.
Output Voltage Programming (Pin 3)
The output voltage can be programmed from
0.7525 to 5.5 V by connecting an external resistor between TRIM pin (Pin 3) and GND pin (Pin 5); see Fig. C. Note that
when trim resistor is not connected, output voltage of the converter is 0.7525 V.
A trim resistor, RTRIM, for a desired output voltage can be calculated using the following equation:
RTRIM =
10.5
−1
(VO -REQ - 0.7525)
[kΩ]
where,
RTRIM = Required value of trim resistor [kΩ]
VO−REQ = Desired (trimmed) output voltage [V]
Vin
Y-Series
Converter
SENSE
(Top View)
ON/OFF
Vout
Vin
Rload
GND
TRIM
R T-INCR
Fig. C: Configuration for programming output voltage.
Note that the tolerance of a trim resistor directly affects the output voltage tolerance. It is recommended to use
standard 1% or 0.5% resistors; for tighter tolerance, two resistors in parallel are recommended rather than one
standard value from Table 1.
The ground pin of the trim resistor should be connected directly to the converter GND pin (Pin 5) with no voltage drop
in between. Table 1 provides the trim resistor values for popular output voltages.
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Table 1: Trim Resistor Value
V0-REG [V]
0.7525
1.0
1.2
1.5
1.8
2.0
2.5
3.3
5.0
5.5
RTRIM [kΩ]
open
41.42
22.46
13.05
9.02
7.42
5.01
3.12
1.47
1.21
The Closest Standard Value [kΩ]
41.2
22.6
13.0
9.09
7.50
4.99
3.09
1.47
1.21
The output voltage can also be programmed by external voltage source. To make trimming less sensitive, a series
external resistor REXT is recommended between TRIM pin and programming voltage source. Control Voltage can be
calculated by the formula:
VCTRL = 0.7 −
(1 + REXT )(VO-REQ - 0.7525)
15
[V]
where
VCTRL = Control voltage [V]
REXT = External resistor between TRIM pin and voltage source; the kΩ value can be chosen depending on the
required output voltage range.
Control voltages with REXT = 0 and REXT = 15 kΩ are shown in Table 2.
Table 2: Control Voltage [VDC]
V0-REG [V]
0.7525
1.0
1.2
1.5
1.8
2.0
2.5
3.3
5.0
5.5
VCTRL (REXT = 0)
0.700
0.684
0.670
0.650
0.630
0.617
0.584
0.530
0.417
0.384
VCTRL(REXT = 15 kΩ)
0.700
0.436
0.223
-0.097
-0.417
-0.631
-1.164
-2.017
-3.831
-4.364
Input Undervoltage Lockout
Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops
below a pre-determined voltage; it will start automatically when Vin returns to a specified range.
The input voltage must be typically 9.0 V for the converter to turn on. Once the converter has been turned on, it will
shut off when the input voltage drops below typically 8.5 V.
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent and short circuit conditions. Upon sensing an overcurrent condition,
the converter will enter hiccup mode. Once overload or short circuit condition is removed, Vout will return to nominal
value.
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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 converter meets North American and International safety regulatory requirements per UL/CSA 62368-1 and
EN/IEC 62368-1. The maximum DC voltage between any two pins is Vin under all operating conditions. Therefore, the
unit has ELV (extra low voltage) output; it meets ES1 requirements under the condition that all input voltages are ELV.
The converter is not internally fused. To comply with safety agencies’ requirements, a recognized fuse with a
maximum rating of 15 Amps must be used in series with the input line.
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 vertical and horizontal mountings, 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.
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 twoounce copper, were used to provide traces for connectivity to the converter.
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 tunnels 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. D for the optimum measuring thermocouple location.
Fig. D: Location of the thermocouple for thermal testing.
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Thermal Derating
Load current vs. ambient temperature and airflow rates are given in Figs. x.1 to x.2 for maximum temperature of 110
°C. Ambient temperature was varied between 25 °C and 85 °C, with airflow rates from 30 to 500 LFM (0.15 m/s to 2.5
m/s), and vertical and horizontal converter mountings. The airflow during the testing is parallel to the long axis of the
converter, going from pin 1 and pin 6 to pins 2–5.
For each set of conditions, the maximum load current is defined as the lowest of:
(i) The output current at which any MOSFET temperature does not exceed a maximum specified temperature
(110 °C) as indicated by the thermographic image, or
(ii) The maximum current rating of the converter (10 A)
During normal operation, derating curves with maximum FET temperature less than or equal to
110 °C should not be exceeded. Temperature on the PCB at the thermocouple location shown in Fig. D should not
exceed 110 °C in order to operate inside the derating curves.
Efficiency
Figure x.3 shows the efficiency vs. load current plot for ambient temperature of 25 ºC, airflow rate of
200 LFM (1 m/s) and input voltages of 9.6 V, 12 V, and 14 V.
Power Dissipation
Fig. x.4 shows the power dissipation vs. load current plot for Ta = 25 ºC, airflow rate of 200 LFM (1 m/s) with vertical
mounting and input voltages of 9.6 V, 12 V, and 14 V.
Ripple and Noise
The output voltage ripple waveform is measured at full rated load current. Note that all output voltage waveforms are
measured across a 1 μF ceramic capacitor.
The output voltage ripple and input reflected ripple current waveforms are obtained using the test setup shown in
Figure E.
iS
1 H
source
inductance
Vsource
Y-Series
CIN
4x47F
ceramic
capacitor
DC-DC
Converter
1F
ceramic
capacitor
CO
100F
ceramic
capacitor
Vout
Fig. E: Test setup for measuring input reflected-ripple currents, is and output voltage ripple.
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12
10
10
Load Current [Adc]
Load Current [Adc]
12
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
0
0
20
30
40
50
60
70
80
90
20
30
40
Ambient Temperature [°C]
Fig. 5.0V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 5.0 V converter mounted
vertically with Vin = 12 V, and maximum MOSFET
temperature 110 C.
60
70
80
90
Fig. 5.0V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 5.0 V converter mounted
horizontally with Vin = 12 V, and maximum MOSFET
temperature 110 C.
1.00
3.0
2.5
Power Dissipation [W]
0.95
Efficiency
50
Ambient Temperature [°C]
0.90
0.85
14 V
12 V
9.6 V
0.80
2.0
1.5
1.0
14 V
12 V
9.6 V
0.5
0.75
0.0
0
2
4
6
8
10
12
0
2
4
Load Current [Adc]
6
8
10
12
Load Current [Adc]
Fig. 5.0V.3: Efficiency vs. load current and input voltage for
Vout = 5.0 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 5.0V.4: Power loss vs. load current and input voltage for
Vout = 5.0 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 5.0V.5: Turn-on transient for Vout = 5.0 V with
application of Vin at full rated load current (resistive) and 100
μF external capacitance at Vin = 12 V. Top trace: Vin (10
V/div.); Bottom trace: output voltage (1 V/div.); Time scale: 2
ms/div.
Fig. 5.0V.6: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with external capacitance
100 μF ceramic + 1 μF ceramic, and Vin = 12 V for Vout =
5.0 V. Time scale: 2 μs/div.
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Fig. 5.0V.8: Output voltage response for Vout = 5.0 V to
negative load current step change from 10 A to 5 A with slew
rate of -5 A/μs at Vin = 12 V. Top trace: output voltage
(100 mV/div.); Bottom trace: load current (5 A/div.). Co =
100 μF ceramic. Time scale: 20 μs/div.
12
12
10
10
Load Current [Adc]
Load Current [Adc]
Fig. 5.0V.7: Output voltage response for Vout = 5.0 V to
positive load current step change from 5 A to 10 A with slew
rate of 5 A/μs at Vin = 12 V. Top trace: output voltage
(100 mV/div.); Bottom trace: load current (5 A/div.). Co =
100 μF ceramic. Time scale: 20 μs/div.
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
0
0
20
30
40
50
60
70
80
90
20
30
40
Ambient Temperature [°C]
60
70
80
90
Ambient Temperature [°C]
Fig. 3.3V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 3.3 V converter mounted
vertically with Vin = 12 V, and maximum MOSFET
temperature 110 C.
Fig. 3.3V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 3.3 V converter mounted
horizontally with Vin = 12 V, and maximum MOSFET
temperature 110 C.
1.00
3.0
2.5
Power Dissipation [W]
0.95
Efficiency
50
0.90
0.85
14 V
12 V
9.6 V
0.80
2.0
1.5
1.0
14 V
12 V
9.6 V
0.5
0.75
0.0
0
2
4
6
8
10
12
0
2
4
Load Current [Adc]
Fig. 3.3V.3: Efficiency vs. load current and input voltage for
Vout = 3.3 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
6
8
10
12
Load Current [Adc]
Fig. 3.3V.4: Power loss vs. load current and input voltage for
Vout = 3.3 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
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tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
Fig. 3.3V.6: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with external capacitance
100 μF ceramic + 1 μF ceramic, and Vin = 12 V for Vout =
3.3 V. Time scale: 2 μs/div.
Fig. 3.3V.7: Output voltage response for Vout = 3.3 V to
positive load current step change from 5 A to 10 A with slew
rate of 5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale:
20 μs/div.
Fig. 3.3V.8: Output voltage response for Vout = 3.3 V to
negative load current step change from 10 A to 5 A with slew
rate of -5 A/μs at Vin = 12 V. Top trace: output voltage 100
mV/div.); Bottom trace: load current (2 A/div.). Co = 100 μF
ceramic. Time scale: 20 μs/div.
12
12
10
10
Load Current [Adc]
Load Current [Adc]
Fig. 3.3V.5: Turn-on transient for Vout = 3.3 V with
application of Vin at full rated load current (resistive) and 100
μF external capacitance at Vin = 12 V. Top trace: Vin (10
V/div.); Bottom trace: output voltage (1 V/div.); Time scale: 2
ms/div.
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
0
0
20
30
40
50
60
70
80
Ambient Temperature [°C]
Fig. 2.5V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 2.5 V converter mounted
vertically with Vin = 12 V, and maximum MOSFET
temperature 110 C.
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 2.5V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 2.5 V converter mounted
horizontally with Vin = 12 V, and maximum MOSFET
temperature 110 C.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
1.00
3.0
2.5
Power Dissipation [W]
Efficiency
0.95
0.90
0.85
14 V
12 V
9.6 V
0.80
2.0
1.5
1.0
14 V
12 V
9.6 V
0.5
0.75
0.0
0
2
4
6
8
10
12
0
2
4
Load Current [Adc]
6
8
10
12
Load Current [Adc]
Fig. 2.5V.3: Efficiency vs. load current and input voltage for
Vout = 2.5 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 2.5V.4: Power loss vs. load current and input voltage for
Vout = 2.5 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 2.5V.5: Turn-on transient for Vout = 2.5 V with
application of Vin at full rated load current (resistive) and 47
μF external capacitance at Vin = 12 V. Top trace: Vin (10
V/div.); Bottom trace: output voltage (1 V/div.); Time scale: 2
ms/div.
Fig. 2.5V.6: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with external capacitance
100 μF ceramic + 1 μF ceramic, and Vin = 12 V for Vout =
2.5 V. Time scale: 2 μs/div.
Fig. 2.5V.7: Output voltage response for Vout = 2.5 V to
positive load current step change from 5 A to 10 A with slew
rate of 5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale:
20 μs/div.
Fig. 2.5V.8: Output voltage response for Vout = 2.5 V to
negative load current step change from 10 A to 5 A with slew
rate of -5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale:
20 μs/div.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
12
10
10
Load Current [Adc]
Load Current [Adc]
12
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
0
0
20
30
40
50
60
70
80
90
20
30
40
Ambient Temperature [°C]
Fig. 2.0V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 2.0 V converter mounted
vertically with Vin = 12 V, and maximum MOSFET
temperature 110 C.
60
70
80
90
Fig. 2.0V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 2.0 V converter mounted
horizontally with Vin = 12 V, and maximum MOSFET
temperature 110 C.
1.00
3.0
2.5
Power Dissipation [W]
0.95
Efficiency
50
Ambient Temperature [°C]
0.90
0.85
14 V
12 V
9.6 V
0.80
2.0
1.5
1.0
14 V
12 V
9.6 V
0.5
0.75
0.0
0
2
4
6
8
10
12
0
2
4
Load Current [Adc]
6
8
10
12
Load Current [Adc]
Fig. 2.0V.3: Efficiency vs. load current and input voltage for
Vout = 2.0 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 2.0V.4: Power loss vs. load current and input voltage for
Vout = 2.0 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 2.0V.5: Turn-on transient for Vout = 2.0 V with
application of Vin at full rated load current (resistive) and 100
μF external capacitance at Vin = 12 V. Top trace: Vin (10
V/div.); Bottom trace: output voltage (1 V/div.); Time scale: 2
ms/div.
Fig. 2.0V.6: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with external capacitance
100 μF ceramic + 1 μF ceramic, and Vin = 12 V for Vout =
2.0 V. Time scale: 2 μs/div.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
Fig. 2.0V.8: Output voltage response for Vout = 2.0 V to
negative load current step change from 10 A to 5 A with slew
rate of -5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale:
20 μs/div.
12
12
10
10
Load Current [Adc]
Load Current [Adc]
Fig. 2.0V.7: Output voltage response for Vout = 2.0 V to
positive load current step change from 5 A to 10 A with slew
rate of 5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale:
20 μs/div.
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
0
0
20
30
40
50
60
70
80
90
20
30
40
Ambient Temperature [°C]
Fig. 1.8V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 1.8 V converter mounted
vertically with Vin = 12 V, and maximum MOSFET
temperature 110 C.
60
70
80
90
Fig. 1.8V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.8 V converter mounted
horizontally with Vin = 12 V, and maximum MOSFET
temperature 110 C.
1.00
3.0
2.5
Power Dissipation [W]
0.95
Efficiency
50
Ambient Temperature [°C]
0.90
0.85
14 V
12 V
9.6 V
0.80
2.0
1.5
1.0
14 V
12 V
9.6 V
0.5
0.75
0.0
0
2
4
6
8
10
12
0
2
4
Load Current [Adc]
Fig. 1.8V.3: Efficiency vs. load current and input voltage for
Vout = 1.8 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
6
8
10
12
Load Current [Adc]
Fig. 1.8V.4: Power loss vs. load current and input voltage for
Vout = 1.8 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
Fig. 1.8V.6: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with external capacitance
100 μF ceramic + 1 μF ceramic, and Vin = 12 V for Vout =
1.8 V. Time scale: 2 μs/div.
Fig. 1.8V.7: Output voltage response for Vout = 1.8 V to
positive load current step change from 5 A to 10 A with slew
rate of 5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale: 20 μs/div.
Fig. 1.8V.8: Output voltage response for Vout = 1.8 V to
negative load current step change from 10 A to 5 A with slew
rate of -5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale: 20 μs/div.
12
12
10
10
Load Current [Adc]
Load Current [Adc]
Fig. 1.8V.5: Turn-on transient for Vout = 1.8 V with
application of Vin at full rated load current (resistive) and 100
μF external capacitance at Vin = 12 V. Top trace: Vin (10
V/div.); Bottom trace: output voltage (1 V/div.); Time scale: 2
ms/div.
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
0
0
20
30
40
50
60
70
80
Ambient Temperature [°C]
Fig. 1.5V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 1.5 V converter mounted
vertically with Vin = 12 V, and maximum MOSFET
temperature 110 C.
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 1.5V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.5 V converter mounted
horizontally with Vin = 12 V, and maximum MOSFET
temperature 110 C.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
0.95
2.0
Power Dissipation [W]
Efficiency
0.90
0.85
0.80
14 V
12 V
9.6 V
0.75
0.70
1.5
1.0
14 V
12 V
9.6 V
0.5
0.0
0
2
4
6
8
10
12
0
2
4
Load Current [Adc]
6
8
10
12
Load Current [Adc]
Fig. 1.5V.3: Efficiency vs. load current and input voltage for
Vout = 1.5 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 1.5V.4: Power loss vs. load current and input voltage for
Vout = 1.5 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 1.5V.5: Turn-on transient for Vout = 1.5 V with
application of Vin at full rated load current (resistive) and 100
μF external capacitance at Vin = 12 V. Top trace: Vin (10
V/div.); Bottom trace: output voltage (1 V/div.); Time scale: 2
ms/div.
Fig. 1.5V.6: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with external capacitance
100 μF ceramic + 1 μF ceramic, and Vin = 12 V for Vout = 1.5
V. Time scale: 2 μs/div.
Fig. 1.5V.7: Output voltage response for Vout = 1.5 V to
positive load current step change from 5 A to 10 A with slew
rate of 5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (2 A/div.). Co = 100 μF
ceramic. Time scale: 20 μs/div.
Fig. 1.5V.8: Output voltage response for Vout = 1.5 V to
negative load current step change from 10 A to 5 A with slew
rate of -5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (2 A/div.). Co = 100 μF
ceramic. Time scale: 20 μs/div.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
12
10
10
Load Current [Adc]
Load Current [Adc]
12
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
0
0
20
30
40
50
60
70
80
90
20
30
40
Ambient Temperature [°C]
50
60
70
80
90
Ambient Temperature [°C]
Fig. 1.2V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 1.2 V converter mounted
vertically with Vin = 12 V, and maximum MOSFET
temperature 110 C.
Fig. 1.2V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.2 V converter mounted
horizontally with Vin = 12 V, and maximum MOSFET
temperature 110 C.
0.95
2.0
Power Dissipation [W]
Efficiency
0.90
0.85
0.80
14 V
12 V
9.6 V
0.75
0.70
1.5
1.0
14 V
12 V
9.6 V
0.5
0.0
0
2
4
6
8
10
12
0
2
4
Load Current [Adc]
6
8
10
12
Load Current [Adc]
Fig. 1.2V.3: Efficiency vs. load current and input voltage for
Vout = 1.2 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 1.2V.4: Power loss vs. load current and input voltage for
Vout = 1.2 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 1.2V.5: Turn-on transient for Vout = 1.2 V with
application of Vin at full rated load current (resistive) and 100
μF external capacitance at Vin = 12 V. Top trace: Vin (10
V/div.); Bottom trace: output voltage (1 V/div.); Time scale: 5
ms/div.
Fig. 1.2V.6: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with external capacitance
100 μF ceramic + 1 μF ceramic, and Vin = 12 V for Vout = 1.2
V. Time scale: 2 μs/div.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
Fig. 1.2V.8: Output voltage response for Vout = 1.2 V to
negative load current step change from 10 A to 5 A with slew
rate of -5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale: 20 μs/div.
12
12
10
10
Load Current [Adc]
Load Current [Adc]
Fig. 1.2V.7: Output voltage response for Vout = 1.2 V to
positive load current step change from 5 A to 10 A with slew
rate of 5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale: 20 μs/div.
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
0
0
20
30
40
50
60
70
80
90
20
30
40
Ambient Temperature [°C]
50
60
70
80
90
Ambient Temperature [°C]
Fig. 1.0V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 1.0 V converter mounted
vertically with Vin = 12 V, and maximum MOSFET
temperature 110 C.
Fig. 1.0V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.0 V converter mounted
horizontally with Vin = 12 V, and maximum MOSFET
temperature 110 C.
0.90
2.0
Power Dissipation [W]
Efficiency
0.85
0.80
0.75
14 V
12 V
9.6 V
0.70
0.65
1.5
1.0
14 V
12 V
9.6 V
0.5
0.0
0
2
4
6
8
10
12
0
2
4
Load Current [Adc]
Fig. 1.0V.3: Efficiency vs. load current and input voltage for
Vout = 1.0 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
6
8
10
12
Load Current [Adc]
Fig. 1.0V.4: Power loss vs. load current and input voltage for
Vout = 1.0 V converter mounted vertically with air flowing at
a rate of 200 LFM (1 m/s) and Ta = 25 C.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
Fig. 1.0V.6: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with external capacitance
100 μF ceramic + 1 μF ceramic, and Vin = 12 V for Vout = 1.0
V. Time scale: 2 μs/div.
Fig. 1.0V.7: Output voltage response for Vout = 1.0 V to
positive load current step change from 5 A to 10 A with slew
rate of 5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co =100 μF
ceramic. Time scale: 20 μs/div.
Fig. 1.0V.8: Output voltage response for Vout = 1.0 V to
negative load current step change from 10 A to 5 A with slew
rate of -5 A/μs at Vin = 12 V. Top trace: output voltage (100
mV/div.); Bottom trace: load current (5 A/div.). Co = 100 μF
ceramic. Time scale: 20 μs/div.
12
12
10
10
Load Current [Adc]
Load Current [Adc]
Fig. 1.0V.5: Turn-on transient for Vout = 1.0 V with
application of Vin at full rated load current (resistive) and 100
μF external capacitance at Vin = 12 V. Top trace: Vin (10
V/div.); Bottom trace: output voltage (1 V/div.); Time scale: 2
ms/div.
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
8
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
4
2
0
0
20
30
40
50
60
70
80
Ambient Temperature [°C]
Fig. 0.7525V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 0.7525 V converter
mounted vertically with Vin = 12 V, and maximum MOSFET
temperature 110 C.
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 0.7525V.2: Available load current vs. ambient
temperature and airflow rates for Vout = 0.7525 V converter
mounted horizontally with Vin = 12 V, and maximum
MOSFET temperature 110 C.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
0.90
2.0
Power Dissipation [W]
Efficiency
0.85
0.80
0.75
14 V
12 V
9.6 V
0.70
0.65
1.5
1.0
14 V
12 V
9.6 V
0.5
0.0
0
2
4
6
8
10
12
0
2
4
Load Current [Adc]
6
8
10
12
Load Current [Adc]
Fig. 0.7525V.3: Efficiency vs. load current and input voltage
for Vout = 0.7525 V converter mounted vertically with air
flowing at a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 0.7525V.4: Power loss vs. load current and input voltage
for Vout = 0.7525 V converter mounted vertically with air
flowing at a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 0.7525V.5: Turn-on transient for Vout = 0.7525 V with
application of Vin at full rated load current (resistive) and
100 μF external capacitance at Vin = 12 V. Top trace: Vin
(10 V/div.); Bottom trace: output voltage (0.5 V/div.); Time
scale: 2 ms/div.
Fig. 0.7525V.6: Output voltage ripple (20 mV/div.) at full
rated load current into a resistive load with external
capacitance 100 μF ceramic + 1 μF ceramic, and Vin = 12 V
for Vout = 0.7525 V. Time scale: 2 μs/div.
Fig. 0.7525V.7: Output voltage response for Vout = 0.7525 V
to positive load current step change from 5 A to 10 A with
slew rate of 5 A/μs at Vin = 12 V. Top trace: output voltage
(100 mV/div.); Bottom trace: load current (5 A/div.). Co =100
μF ceramic. Time scale: 20 μs/div.
Fig. 0.7525V.8: Output voltage response for Vout = 0.7525 V
to negative load current step change from 10 A to 5 A with
slew rate of -5 A/μs at Vin = 12 V. Top trace: output voltage
(100 mV/div.); Bottom trace: load current (5 A/div.). Co = 100
μF ceramic. Time scale: 20 μs/div.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00644_AA2
PAD/PIN CONNECTIONS
Pad/Pin #
Function
1
ON/OFF
2
SENSE
3
TRIM
4
Vout
5
GND
6
Vin
2
3
4
5
1(*)
6
YS12S Platform Notes
TOP VIEW
(*) PIN # 1 ROTATED 90°
•
•
•
•
•
•
SIDE VIEW
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Gold over Nickel
Converter Weight: 0.23 oz [6.50 g]
Converter Height: 0.327” Max., 0.301” Min.
Recommended Surface-Mount Pads:
Min. 0.080” X 0.112” [2.03 x 2.84]
YS12S Pinout (Surface Mount)
Product
Series
YS
Y-Series
Input
Voltage
12
9.6 V – 14 V
Mounting Scheme
S
S Surface-Mount
Rated Load
Current
10
10 A
(0.7525 V to 5.5 V)
–
Enable Logic
RoHS Compatible
0
G
0 Standard
(Positive Logic)
No Suffix RoHS
lead-solder-exempt compliant
D Opposite of Standard
(Negative Logic)
G RoHS compliant for all
six substances
The example above describes P/N YS12S10-0G: 9.6V – 14V input, surface mount, 10A at 0.7525V to 5.5V output, standard enable
logic, and RoHS compliant for all six substances. Please consult factory regarding availability of a specific version.
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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