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+1-866.513.2839
Asia-Pacific
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Europe, Middle East
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BCD.00645_AA
RoHS lead-free solder and lead-solder-exempted products
are available
Delivers up to 16 A (88 W)
Extended input range 9.6 V – 14 V
High efficiency (0.948 at 5 V output)
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: 0.23 oz [6.50 g]
Coplanarity less than 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
UL 60950 recognition in U.S. & Canada, and DEMKO
certification per IEC/EN 60950
Bel Power Solutions point-of-load converters are
recommended for use with regulated bus converters in an
Intermediate Bus Architecture (IBA). The YS12S16 non-
isolated DC-DC converters deliver up to 16 A of output
current in an industry-standard surface-mount package.
Operating from a 9.6-14 VDC input, the YS12S16
converters are ideal choices for Intermediate Bus
Architectures where point-of-load power delivery is
generally a requirement. They provide an extremely tight
regulated programmable output voltage of 0.7525 V to 5.5
V.
The YS12S16 converters provide exceptional thermal
performance, even in high temperature environments with
minimal airflow. This 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
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
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
UNITS
Absolute Maximum Ratings
Input Voltage
Continuous
VDC
Operating Ambient Temperature
°C
Storage Temperature
°C
Feature Characteristics
Switching Frequency
kHz
Output Voltage Trim Range1
By external resistor, See Trim Table 1
VDC
Remote Sense Compensation1
Percent of VOUT(NOM)
VDC
Turn-On Delay Time2
Full resistive load
With Vin = (Converter Enabled, then Vin applied)
From Vin = Vin(min) to Vo=0.1* Vo(nom)
ms
With Enable (Vin = Vin(nom) applied, then enabled)
From enable to Vo= 0.1*Vo(nom)
ms
Rise time2 (Full resistive load)
From 0.1*Vo(nom) to 0.9*Vo(nom)
ms
ON/OFF Control (Positive Logic)3
Converter Off
VDC
Converter On
VDC
ON/OFF Control (Negative Logic) 3
Converter Off
VDC
Converter On
VDC
Input Characteristics
Operating Input Voltage Range
VDC
Input Under Voltage Lockout
Turn-on Threshold
VDC
Turn-off Threshold
VDC
Maximum Input Current
16 ADC Out @ 9.6 VDC In
VOUT = 5.0 VDC
ADC
VOUT = 3.3 VDC
ADC
VOUT = 2.5 VDC
ADC
VOUT = 2.0 VDC
ADC
VOUT = 1.8 VDC
ADC
VOUT = 1.5 VDC
ADC
VOUT = 1.2 VDC
ADC
VOUT = 1.0 VDC
ADC
VOUT = 0.7525 VDC
ADC
Input Stand-by Current (Converter disabled)
mA
Input No Load Current (Converter enabled)
VOUT = 5.0 VDC
mA
VOUT = 3.3 VDC
mA
VOUT = 2.5 VDC
mA
VOUT = 2.0 VDC
mA
VOUT = 1.8 VDC
mA
VOUT = 1.5 VDC
mA
VOUT = 1.2 VDC
mA
VOUT = 1.0 VDC
mA
VOUT = 0.7525 VDC
mA
Input Reflected-Ripple Current -
is
See Fig. E for setup. (BW = 20 MHz)
VOUT = 5.0 VDC
mAP-P
VOUT = 3.3 VDC
mAP-P
VOUT = 2.5 VDC
mAP-P
VOUT = 2.0 VDC
mAP-P
VOUT = 1.8 VDC
mAP-P
VOUT = 1.5 VDC
mAP-P
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
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BCD.00645_AA
VOUT = 1.2 VDC
mAP-P
VOUT = 1.0 VDC
mAP-P
VOUT = 0.7525 VDC
mAP-P
Input Voltage Ripple Rejection
120 Hz
dB
Output Characteristics
Output Voltage Set Point (no load)
+1.5
%Vout
Output Regulation
Over Line
Full resistive load
mV
Over Load
From no load to full load
mV
Output Voltage Range
(Over all operating input voltage, resistive load
and temperature conditions until end of life )
+2.5
%Vout
Output Ripple and Noise - 20MHz bandwidth
Over line, load and temperature (Fig. E)
Peak-to-Peak
VOUT = 0.7525 VDC
19
mVP-P
Peak-to-Peak
VOUT = 5.0 VDC
65
mVP-P
External Load Capacitance
Plus full load (resistive)
Min ESR > 1mΩ
1,000
μF
Min ESR > 10 mΩ
5,000
μF
Output Current Range
16
A
Output Current Limit Inception (IOUT)
A
Output Short- Circuit Current , RMS Value
Short=10 mΩ, continuous
A
Dynamic Response
Load current change from 8A – 16A, di/dt = 5 A/μS
Co = 100μF ceramic + 470 μF POS
mV
Settling Time (VOUT < 10% peak deviation)
µs
Unloading current change from 16A – 8A, di/dt = -5 A/μS
Co = 100 μF ceramic + 470 μF POS
mV
Settling Time (VOUT < 10% peak deviation)
µs
Efficiency
Full load (16A)
VOUT = 5.0 VDC
%
VOUT = 3.3 VDC
%
VOUT = 2.5 VDC
%
VOUT = 2.0 VDC
%
VOUT = 1.8 VDC
%
VOUT = 1.5 VDC
%
VOUT = 1.2 VDC
%
VOUT = 1.0 VDC
%
VOUT = 0.7525 VDC
%
Notes:
1 The output voltage should not exceed 5.5V (taking into account both the programming and remote sense compensation).
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.
YS12S16 DC-DC Converter
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866.513.2839
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BCD.00645_AA
Input and Output Impedance
The YS12S16 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 input pins in order to ensure stability of the converter and reduce input ripple voltage. Internally, the
converter has 30 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 μF-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 YS12S16 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 improved transient
performance and lower output voltage ripple.
It is important to keep low resistance and low inductance PCB traces for connecting load to the output pins of the
converter in order to maintain good load regulation.
ON/OFF (Pin 1)
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 (standard option) and negative logic, and both are referenced to GND. 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.
Fig. A: Circuit configuration for ON/OFF function.
The negative logic version turns the converter on when the ON/OFF pin is at logic low or left open, and turns the
converter off when the ON/OFF pin is at a logic high or connected to Vin.
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 75K 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 V – 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 low voltage drop.
Rload
Vin
CONTROL
INPUT
Vin
Vin
GND
ON/OFF
SENSE
(Top View)
Converter
TRIM
Vout
R*
R* is for negative logic option only
Y-Series
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
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BCD.00645_AA
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.
Fig. B: Remote sense circuit configuration.
Because the sense lead carries minimal current, large trace on the end-user board are not required. However, sense
trace should be located close to a ground plane to minimize system noise and insure optimum performance.
When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power
capability of the converter, 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 V to 5.5 V by connecting an external resistor between TRIM pin (Pin 3) and GND pin (Pin 5); see Fig. C.
A trim resistor, RTRIM, for a desired output voltage can be calculated using the following equation:
1
0.7525)- (V 5.10
RREQ-O
RIMT
[k]
where,
TRIMR
Required value of trim resistor [k]
REQOV
Desired (trimmed) output voltage [V]
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.
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.
VinVin
Rw
Rw
Rload
Vin
GND
ON/OFF (Top View)
Converter
TRIM
SENSE
Vout
Y-Series
Vin
RTRIM
Rload
Converter
Vin
GND
ON/OFF (Top View)
TRIM
Vout
SENSE
Y-Series
YS12S16 DC-DC Converter
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BCD.00645_AA
Table 1: Trim Resistor Value
V0-REG [V]
RTRIM [kΩ]
The Closest Standard Value [kΩ]
0.7525
open
1.0
41.42
41.2
1.2
22.46
22.6
1.5
13.05
13.0
1.8
9.02
9.09
2.0
7.42
7.50
2.5
5.01
4.99
3.3
3.12
3.09
5.0
1.47
1.47
5.5
1.21
1.21
The output voltage can be also 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:
15 0.7525)- )(VR1(
7.0V REQ-OEXT
CTRL
[V]
where,
CTRLV
Control voltage [V]
EXTR
External resistor between TRIM pin and voltage source; the value can be chosen depending on the required
output voltage range [k].
Control voltages with
EXTR
0 and
EXTR
15K are shown in Table 2.
Table 2: Control Voltage [VDC]
V0-REG [V]
VCTRL (REXT = 0)
VCTRL(REXT = 15K)
0.7525
0.700
0.700
1.0
0.684
0.436
1.2
0.670
0.223
1.5
0.650
-0.097
1.8
0.630
-0.417
2.0
0.617
-0.631
2.5
0.584
-1.164
3.3
0.530
-2.017
5.0
0.417
-3.831
5.5
0.384
-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 at least 9.6V (typically 9V) for the converter to turn on. Once the converter has been turned
on, it will shut off when the input voltage drops below typically 8.5V.
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent and short circuit conditions. Upon sensing an over-current condition,
the converter will enter hiccup mode. Once over-load or short circuit condition is removed, Vout will return to nominal
value.
YS12S16 DC-DC Converter
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866.513.2839
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BCD.00645_AA
Overtemperature Protection (OTP)
The converter will shut down under an over-temperature 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 UL60950 and EN60950.
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 SELV 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 mounting, efficiency, start-up 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, comprising two-
ounce 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 tunnel facilities 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. . It is recommended the use of AWG #40 gauge thermocouples to
ensure measurement accuracy. Careful routing of the thermocouple leads will further minimize measurement error.
Refer to Fig. D for optimum measuring thermocouple locations.
Fig. D: Location of the thermocouple for thermal testing.
YS12S16 DC-DC Converter
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BCD.00645_AA
Thermal Derating
Load current vs. ambient temperature and airflow rates are given in Figs. x.1 for maximum temperature of 120 °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 converter mounting. The airflow during the testing is parallel to the short 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
(120 °C) as indicated by the thermo-graphic image, or
(ii) The maximum current rating of the converter (16 A)
During normal operation, derating curves with maximum FET temperature less than or equal to 120 °C should not be
exceeded. Temperature on the PCB at the thermocouple location shown in Fig. D should not exceed 120 °C in order
to operate inside the derating curves.
Efficiency
Figure x.2 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.3 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 F ceramic capacitor.
The output voltage ripple and input reflected ripple current waveforms are obtained using the test setup shown in
Figure E.
Fig. E: Test setup for measuring input reflected ripple currents, is and output voltage ripple.
iS
Vout
Vsource
1F
ceramic
capacitor
1 H
source
inductance DC/DC
Converter
4x47F
ceramic
capacitor
100F
ceramic
capacitor
CO
CIN
Y-Series
YS12S16 DC-DC Converter
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BCD.00645_AA
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
4
8
12
16
20
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)
Fig. 5.0V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 5.0V converter mounted vertically
with Vin = 12V, and maximum MOSFET temperature
120C.
Load Current [Adc]
0 3 6 9 12 15 18
Efficiency
0.75
0.80
0.85
0.90
0.95
1.00
14 V
12 V
9.6 V
Fig. 5.0V.2: Efficiency vs. load current and input voltage for
Vout = 5.0V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Load Current [Adc]
0 3 6 9 12 15 18
Power Dissipation [W]
0
1
2
3
4
5
6
14 V
12 V
9.6 V
Fig. 5.0V.3: Power loss vs. load current and input voltage for
Vout = 5.0V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Fig. 5.0V.4: Turn-on transient for Vout = 5.0V with
application of Vin at full rated load current (resistive) and
100
μ
F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
2ms/div.
Fig. 5.0V.5: Output voltage ripple (20mV/div.) at full rated
load current into a resistive load with external capacitance
100
μ
F ceramic + 1
μ
F ceramic and Vin = 12V for Vout = 5.0V.
Time scale: 2
μ
s/div.
Fig. 5.0V.6: Output voltage response for Vout = 5.0V to
positive load current step change from 8A to 16A with slew
rate of 5A/
μ
s at Vin = 12V. Top trace: output voltage
(200mV/div.); Bottom trace: load current (5A/div.). Co =
100
μ
F ceramic. Time scale: 20
μ
s/div.
YS12S16 DC-DC Converter
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866.513.2839
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BCD.00645_AA
Fig. 5.0V.7: Output voltage response for Vout = 5.0V to negative load current step change from 16A to 8A with slew rate of -5A/
μ
s at
Vin = 12V. Top trace: output voltage (200mV/div.); Bottom trace: load current (5A/div.). Co = 100
μ
F ceramic. Time scale: 20
μ
s/div.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
4
8
12
16
20
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)
Fig. 3.3V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 3.3V converter mounted vertically
with Vin = 12V, and maximum MOSFET temperature
120C.
Load Current [Adc]
0 3 6 9 12 15 18
Efficiency
0.75
0.80
0.85
0.90
0.95
1.00
14 V
12 V
9.6 V
Fig. 3.3V.2: Efficiency vs. load current and input voltage for
Vout = 3.3V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Load Current [Adc]
0 3 6 9 12 15 18
Power Dissipation [W]
0
1
2
3
4
5
6
14 V
12 V
9.6 V
Fig. 3.3V.3: Power loss vs. load current and input voltage for
Vout = 3.3V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Fig. 3.3V.4: Turn-on transient for Vout = 3.3V with
application of Vin at full rated load current (resistive) and
100
μ
F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
2ms/div.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Fig. 3.3V.5: Output voltage ripple (20mV/div.) at full rated
load current into a resistive load with external capacitance
100
μ
F ceramic + 1
μ
F ceramic and Vin = 12V for Vout = 3.3V.
Time scale: 2
μ
s/div.
Fig. 3.3V.6: Output voltage response for Vout = 3.3V to
positive load current step change from 8A to 16A with slew
rate of 5A/
μ
s at Vin = 12V. Top trace: output voltage
(200mV/div.); Bottom trace: load current (5A/div.). Co =
100
μ
F ceramic. Time scale: 20
μ
s/div.
Fig. 3.3V.7: Output voltage response for Vout = 3.3V to negative load current step change from 16A to 8A with slew rate of -5A/
μ
s at
Vin = 12V. Top trace: output voltage (200mV/div.); Bottom trace: load current (5A/div.). Co = 100
μ
F ceramic. Time scale: 20
μ
s/div.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
4
8
12
16
20
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)
Fig. 2.5V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 2.5V converter mounted
vertically with Vin = 12V, and maximum MOSFET
temperature 120C.
Load Current [Adc]
0 3 6 9 12 15 18
Efficiency
0.75
0.80
0.85
0.90
0.95
1.00
14 V
12 V
9.6 V
Fig. 2.5V.2: Efficiency vs. load current and input voltage for
Vout = 2.5V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Load Current [Adc]
0 3 6 9 12 15 18
Power Dissipation [W]
0
1
2
3
4
5
6
14 V
12 V
9.6 V
Fig. 2.5V.3: Power loss vs. load current and input voltage for
Vout = 2.5V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Fig. 2.5V.4: Turn-on transient for Vout = 2.5V with
application of Vin at full rated load current (resistive) and
100
μ
F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
2ms/div.
Fig. 2.5V.5: Output voltage ripple (20mV/div.) at full rated
load current into a resistive load with external capacitance
100
μ
F ceramic + 1
μ
F ceramic and Vin = 12V for Vout = 2.5V.
Time scale: 2
μ
s/div.
Fig. 2.5V.6: Output voltage response for Vout = 2.5V to
positive load current step change from 8A to 16A with slew
rate of 5A/
μ
s at Vin = 12V. Top trace: output voltage
(200mV/div.); Bottom trace: load current (5A/div.). Co =
100
μ
F ceramic. Time scale: 20
μ
s/div.
Fig. 2.5V.7: Output voltage response for Vout = 2.5V to negative load current step change from 16A to 8A with slew rate of -5A/
μ
s at
Vin = 12V. Top trace: output voltage (200mV/div.); Bottom trace: load current (5A/div.). Co = 100
μ
F ceramic. Time scale: 20
μ
s/div.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
4
8
12
16
20
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)
Fig. 2.0V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 2.0V converter mounted
vertically with Vin = 12V, and maximum MOSFET
temperature 120C.
Load Current [Adc]
0 3 6 9 12 15 18
Efficiency
0.75
0.80
0.85
0.90
0.95
1.00
14 V
12 V
9.6 V
Fig. 2.0V.2: Efficiency vs. load current and input voltage for
Vout = 2.0V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Load Current [Adc]
0 3 6 9 12 15 18
Power Dissipation [W]
0
1
2
3
4
5
6
14 V
12 V
9.6 V
Fig. 2.0V.3: Power loss vs. load current and input voltage for
Vout = 2.0V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Fig. 2.0V.4: Turn-on transient for Vout = 2.0V with
application of Vin at full rated load current (resistive) and
100
μ
F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
2ms/div.
Fig. 2.0V.5: Output voltage ripple (20mV/div.) at full rated
load current into a resistive load with external capacitance
100
μ
F ceramic + 1
μ
F ceramic and Vin = 12V for Vout = 2.0V.
Time scale: 2
μ
s/div.
Fig. 2.0V.6: Output voltage response for Vout = 2.0V to
positive load current step change from 8A to 16A with slew
rate of 5A/
μ
s at Vin = 12V. Top trace: output voltage
(200mV/div.); Bottom trace: load current (5A/div.). Co =
100
μ
F ceramic. Time scale: 20
μ
s/div.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Fig. 2.0V.7: Output voltage response for Vout = 2.0V to negative load current step change from 16A to 8A with slew rate of -5A/
μ
s at
Vin = 12V. Top trace: output voltage (200mV/div.); Bottom trace: load current (5A/div.). Co = 100
μ
F ceramic. Time scale: 20
μ
s/div.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
4
8
12
16
20
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)
Fig. 1.8V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 1.8V converter mounted
vertically with Vin = 12V, and maximum MOSFET
temperature 120C.
Load Current [Adc]
0 3 6 9 12 15 18
Efficiency
0.75
0.80
0.85
0.90
0.95
1.00
14 V
12 V
9.6 V
Fig. 1.8V.2: Efficiency vs. load current and input voltage for
Vout = 1.8V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Load Current [Adc]
0 3 6 9 12 15 18
Power Dissipation [W]
0
1
2
3
4
5
6
14 V
12 V
9.6 V
Fig. 1.8V.3: Power loss vs. load current and input voltage for
Vout = 1.8V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Fig. 1.8V.4: Turn-on transient for Vout = 1.8V with
application of Vin at full rated load current (resistive) and
100
μ
F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
2ms/div.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Fig. 1.8V.5: Output voltage ripple (20mV/div.) at full rated
load current into a resistive load with external capacitance
100
μ
F ceramic + 1
μ
F ceramic and Vin = 12V for Vout = 1.8V.
Time scale: 2
μ
s/div.
Fig. 1.8V.6: Output voltage response for Vout = 1.8V to
positive load current step change from 8A to 16A with slew
rate of 5A/
μ
s at Vin = 12V. Top trace: output voltage
(200mV/div.); Bottom trace: load current (5A/div.). Co =
100
μ
F ceramic. Time scale: 20
μ
s/div.
Fig. 1.8V.7: Output voltage response for Vout = 1.8V to negative load current step change from 16A to 8A with slew rate of -5A/
μ
s at
Vin = 12V. Top trace: output voltage (200mV/div.); Bottom trace: load current (5A/div.). Co = 100
μ
F ceramic. Time scale: 20
μ
s/div.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
4
8
12
16
20
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)
Fig. 1.5V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 1.5V converter mounted vertically
with Vin = 12V, air flowing and maximum MOSFET
temperature 120C.
Load Current [Adc]
0 3 6 9 12 15 18
Efficiency
0.70
0.75
0.80
0.85
0.90
0.95
14 V
12 V
9.6 V
Fig. 1.5V.2: Efficiency vs. load current and input voltage for
Vout = 1.5V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Load Current [Adc]
0 3 6 9 12 15 18
Power Dissipation [W]
0
1
2
3
4
5
14 V
12 V
9.6 V
Fig. 1.5V.3: Power loss vs. load current and input voltage for
Vout = 1.5V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Fig. 1.5V.4: Turn-on transient for Vout = 1.5V with
application of Vin at full rated load current (resistive) and
100
μ
F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
2ms/div.
Fig. 1.5V.5: Output voltage ripple (20mV/div.) at full rated
load current into a resistive load with external capacitance
100
μ
F ceramic + 1
μ
F ceramic and Vin = 12V for Vout = 1.5V.
Time scale: 2
μ
s/div.
Fig. 1.5V.6: Output voltage response for Vout = 1.5V to
positive load current step change from 8A to 16A with slew
rate of 5A/
μ
s at Vin = 12V. Top trace: output voltage
(200mV/div.); Bottom trace: load current (5A/div.). Co =
100
μ
F ceramic. Time scale: 20
μ
s/div.
Fig. 1.5V.7: Output voltage response for Vout = 1.5V to negative load current step change from 16A to 8A with slew rate of -5A/
μ
s at
Vin = 12V. Top trace: output voltage (200mV/div.); Bottom trace: load current (5A/div.). Co = 100
μ
F ceramic. Time scale: 20
μ
s/div.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
4
8
12
16
20
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)
Fig. 1.2V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 1.2V converter mounted vertically
with Vin = 12V, and maximum MOSFET temperature
120C.
Load Current [Adc]
0 3 6 9 12 15 18
Efficiency
0.70
0.75
0.80
0.85
0.90
0.95
14 V
12 V
9.6 V
Fig. 1.2V.2: Efficiency vs. load current and input voltage for
Vout = 1.2V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Load Current [Adc]
0 3 6 9 12 15 18
Power Dissipation [W]
0
1
2
3
4
5
14 V
12 V
9.6 V
Fig. 1.2V.3: Power loss vs. load current and input voltage for
Vout = 1.2V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Fig. 1.2V.4: Turn-on transient for Vout = 1.2V with
application of Vin at full rated load current (resistive) and
100
μ
F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
2ms/div.
Fig. 1.2V.5: Output voltage ripple (20mV/div.) at full rated
load current into a resistive load with external capacitance
100
μ
F ceramic + 1
μ
F ceramic and Vin = 12V for Vout = 1.2V.
Time scale: 2
μ
s/div.
Fig. 1.2V.6: Output voltage response for Vout = 1.2V to
positive load current step change from 8A to 16A with slew
rate of 5A/
μ
s at Vin = 12V. Top trace: output voltage
(200mV/div.); Bottom trace: load current (5A/div.). Co =
100
μ
F ceramic. Time scale: 20
μ
s/div.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Fig. 1.2V.7: Output voltage response for Vout = 1.2V to negative load current step change from 16A to 8A with slew rate of -5A/
μ
s at
Vin = 12V. Top trace: output voltage (200mV/div.); Bottom trace: load current (5A/div.). Co = 100
μ
F ceramic. Time scale: 20
μ
s/div.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
4
8
12
16
20
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)
Fig. 1.0V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 1.0V converter mounted vertically
with Vin = 12V, and maximum MOSFET temperature
120C.
Load Current [Adc]
0 3 6 9 12 15 18
Efficiency
0.60
0.65
0.70
0.75
0.80
0.85
0.90
14 V
12 V
9.6 V
Fig. 1.0V.2: Efficiency vs. load current and input voltage for
Vout = 1.0V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Load Current [Adc]
0 3 6 9 12 15 18
Power Dissipation [W]
0
1
2
3
4
5
14 V
12 V
9.6 V
Fig. 1.0V.3: Power loss vs. load current and input voltage for
Vout = 1.0V converter mounted vertically with air flowing at a
rate of 200 LFM (1 m/s) and Ta = 25C.
Fig. 1.0V.4: Turn-on transient for Vout = 1.0V with
application of Vin at full rated load current (resistive) and
100
μ
F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
2ms/div.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Fig. 1.0V.5: Output voltage ripple (20mV/div.) at full rated
load current into a resistive load with external capacitance
100
μ
F ceramic + 1
μ
F ceramic and Vin = 12V for Vout = 1.0V.
Time scale: 2
μ
s/div.
Fig. 1.0V.6: Output voltage response for Vout = 1.0V to
positive load current step change from 8A to 16A with slew
rate of 5A/
μ
s at Vin = 12V. Top trace: output voltage
(200mV/div.); Bottom trace: load current (5A/div.). Co =
100
μ
F ceramic. Time scale: 20
μ
s/div.
Fig. 1.0V.7: Output voltage response for Vout = 1.0V to negative load current step change from 16A to 8A with slew rate of -5A/
μ
s at
Vin = 12V. Top trace: output voltage (200mV/div.); Bottom trace: load current (5A/div.). Co = 100
μ
F ceramic. Time scale: 20
μ
s/div.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
4
8
12
16
20
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)
Fig. 0.7525V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 1.0V converter
mounted vertically with Vin = 12V, and maximum MOSFET
temperature 120C.
Load Current [Adc]
0 3 6 9 12 15 18
Efficiency
0.65
0.70
0.75
0.80
0.85
0.90
14 V
12 V
9.6 V
Fig. 0.7525V.2: Efficiency vs. load current and input voltage
for Vout = 0.7525V converter mounted vertically with air
flowing at a rate of 200 LFM (1 m/s) and Ta = 25C.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
Load Current [Adc]
0 3 6 9 12 15 18
Power Dissipation [W]
0
1
2
3
4
5
14 V
12 V
9.6 V
Fig. 0.7525V.3: Power loss vs. load current and input voltage
for Vout = 0.7525V converter mounted vertically with air
flowing at a rate of 200 LFM (1 m/s) and Ta = 25C.
Fig. 0.7525V.4: Turn-on transient for Vout = 0.7525V with
application of Vin at full rated load current (resistive) and
100
μ
F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
2ms/div.
Fig. 0.7525V.5: Output voltage ripple (20mV/div.) at full rated
load current into a resistive load with external capacitance
100
μ
F ceramic + 1
μ
F ceramic and Vin = 12V for Vout =
0.7525V. Time scale: 2
μ
s/div.
Fig. 0.7525V.6: Output voltage response for Vout = 0.7525V
to positive load current step change from 8A to 16A with
slew rate of 5A/
μ
s at Vin = 12V. Top trace: output voltage
(200mV/div.); Bottom trace: load current (5A/div.). Co =
100
μ
F ceramic. Time scale: 20
μ
s/div.
Fig. 0.7525V.7: Output voltage response for Vout = 0.7525V to negative load current step change from 16A to 8A with slew rate of -
5A/
μ
s at Vin = 12V. Top trace: output voltage (200mV/div.); Bottom trace: load current (5A/div.). Co = 100
μ
F ceramic. Time scale:
20
μ
s/div.
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA
YS12S Pinout (Surface Mount)
Product
Series
Input
Voltage
Mounting Scheme
Rated Load
Current
Enable Logic
RoHS Compatible
YM
12
S
16
–
0
G
Y-Series
9.6 V – 14 V
S Surface-Mount
16 A
(0.7525 V to 5.5 V)
0 Standard
(Positive Logic)
D Opposite of Standard
(Negative Logic)
No Suffix RoHS
lead-solder-exempt compliant
G RoHS compliant for all
six substances
The example above describes P/N YS12S16-0G: 9.6V – 14V input, surface mount, 16A 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.
TOP VIEW
(*) PIN # 1 ROTATED 90°
6
SIDE VIEW
345
1(*)
2
PAD/PIN CONNECTIONS
Pad/Pin #
Function
1
ON/OFF
2
SENSE
3
TRIM
4
Vout
5
GND
6
Vin
YS12S Platform Notes
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]
YS12S16 DC-DC Converter
© 2015 Bel Power Solutions, Inc.
866.513.2839
tech.support@psbel.com
BCD.00645_AA