Bel Power Solutions point-of-load converters are
recommended for use with regulated bus converters in an
Intermediate Bus Architecture (IBA). The YM12S05 nonisolated DC-DC converters deliver up to 5A of output
current in an industry-standard surface-mount package.
Operating from a 9.6-14 VDC input, the YM12S05
converters are ideal choices for Intermediate Bus
Architectures where Point-of-Load power (POL) delivery
is generally a requirement. They provide an extremely
tight regulated programmable output voltage of 0.7525 V
to 5.5 V.
• RoHS lead free and lead-solder-exempted products are
available
• Delivers up to 5 A (28 W)
• Extended input range 9.6 V – 14 V
• No derating up to 85 C (70 °C for 5V and 3.3V)
• Surface-mount package
• Industry-standard footprint and pinout
• Small size and low profile: 0.80” x 0.45” x 0.247”
(20.32 x 11.43 x 6.27mm)
• Weight: 0.079 oz [2.26 g]
• Co-planarity < 0.003"
• 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 ON/OFF
• Fixed frequency operation
• Auto-reset output overcurrent protection
• Auto-reset overtemperature protection
• High reliability, MTBF approx. 71.8 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
The Y-Series 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 V and 3.3 V outputs), even without airflow at
natural convection. 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
Distributed Power Architectures
Data communications
Telecommunications
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
Feature Characteristics
Switching Frequency
310
Output Voltage Trim Range1
By external resistor, See Trim Table 1
0.7525
kHz
Turn-On Delay Time
Full resistive load
With Vin = (Converter Enabled, then Vin applied)
From Vin = Vin(min) to Vo=0.1* Vo(nom)
7.5
ms
With Enable (Vin = Vin(nom) applied, then enabled)
From enable to Vo= 0.1*Vo(nom)
7.5
ms
Rise time (Full resistive load)
From 0.1*Vo(nom) to 0.9*Vo(nom)
7
ON/OFF Control 2
ms
Converter Off
2.4
Vin
VDC
Converter On
-5
0.8
VDC
14
VDC
Input Characteristics
Operating Input Voltage Range
Input Under Voltage Lockout
Maximum Input Current
9.6
9.0
VDC
Turn-off Threshold
8.8
VDC
5 ADC Out @ 9.6 VDC In
VOUT = 5.0 VDC
2.9
ADC
VOUT = 3.3 VDC
2.0
ADC
VOUT = 2.5 VDC
1.6
ADC
VOUT = 2.0 VDC
1.4
ADC
VOUT = 1.8 VDC
1.25
ADC
VOUT = 1.5 VDC
1.0
ADC
VOUT = 1.2 VDC
0.8
ADC
VOUT = 1.0 VDC
0.7
ADC
Input Stand-by Current (Converter disabled)
Input No Load Current (Converter enabled)
Input Reflected-Ripple Current - is
Input Voltage Ripple Rejection
12
Turn-on Threshold
1
mA
VOUT = 5.0 VDC
65
mA
VOUT = 3.3 VDC
47
mA
VOUT = 2.5 VDC
35
mA
VOUT = 2.0 VDC
28
mA
VOUT = 1.8 VDC
25
mA
VOUT = 1.5 VDC
20
mA
VOUT = 1.2 VDC
17
mA
VOUT = 1.0 VDC
15
mA
VOUT = 5.0 VDC
55
mAP-P
VOUT = 3.3 VDC
48
mAP-P
VOUT = 2.5 VDC
43
mAP-P
VOUT = 2.0 VDC
38
mAP-P
VOUT = 1.8 VDC
35
mAP-P
VOUT = 1.5 VDC
32
mAP-P
VOUT = 1.2 VDC
28
mAP-P
VOUT = 1.0 VDC
25
mAP-P
120Hz
72
dB
See Fig. D for setup. (BW=20MHz)
Notes:
1
2
The output voltage should not exceed 5.5V.
The converter is on if the ON/OFF pin is left open.
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Output Characteristics
Output Voltage Set Point (no load)
-1.5
Vout
+1.5
%Vout
Output Regulation3
Over Line
Over Load
Output Voltage Range
(Overall operating input voltage, resistive load
and temperature conditions until end of life )
Output Ripple and Noise - 20MHz bandwidth
Full resistive load
From no load to full load
1
mV
0.25
%Vout
-2.5
+2.5
%Vout
Over line, load and temperature (Fig. D)
Peak-to-Peak
VOUT = 5.0 VDC
55
70
mVP-P
Peak-to-Peak
VOUT = 0.7525 VDC
40
50
mVP-P
Min ESR > 1mΩ
1,000
μF
Min ESR > 10 mΩ
2,000
μF
5
A
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 2.5A to 5A with di/dt = 5 A/μS
Co = 47 μF ceramic. + 1 μF ceramic
Settling Time (VOUT < 10% peak deviation)
Iout step from 5A to 2.5A with di/dt = -5 A/μS
A
2
Arms
100
mV
20
µs
100
mV
20
µs
VOUT = 5.0 VDC
92.0
%
VOUT = 3.3 VDC
88.5
%
VOUT = 2.5 VDC
86.5
%
VOUT = 2.0 VDC
84.5
%
VOUT = 1.8 VDC
83.5
%
VOUT = 1.5 VDC
81.5
%
VOUT = 1.2 VDC
79.0
%
VOUT = 1.0 VDC
76.0
%
Co = 47 μF ceramic + 1 μF ceramic
Settling Time (VOUT < 10% peak deviation)
Efficiency
10
Full load (5A)
Notes:
3
Trim resistor connected across the GND and TRIM pins of the converter.
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Input and Output Impedance
The Y-Series 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 47μF) 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 10μF (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 47μF-100μF 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 YM12S05 has been designed for stable operation with no external capacitance on the output. It is recommended
to place low ESR ceramic capacitors to minimize output ripple voltage. Low ESR ceramic capacitors placed as close
as possible to the load 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 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 that is referenced to
GND (Pin 4). The typical connections are shown in Fig. A.
To turn the converter on the ON/OFF pin should be at logic low or left open, and to turn the converter off the ON/OFF
pin should be at logic high or connected to Vin.
The ON/OFF pin is internally pulled-down. 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, add a pull-up resistor (R*) of 75K to
Vin as shown in Fig. A.
Vin
R*
Y-Series
Converter
Vout
(Top View)
ON/OFF
Vin
Rload
GND
TRIM
CONTROL
INPUT
Fig. A: Circuit configuration for ON/OFF function.
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 2.3V – 5V
- sourcing up to 0.75 mA when connected to Vin
Output Voltage Programming (Pin 3)
The output voltage can be programmed from 0.7525V to 5.5V by connecting an external resistor between TRIM pin
(Pin 3) and GND pin (Pin 4); see Fig. B. Note that when trim resistor is not connected, output voltage of the converter
is 0.7525V.
A trim resistor, RTRIM, for a desired output voltage can be calculated using the following equation:
RTRIM =
10.5
−1
(VO -REQ - 0.7525)
[k]
where,
RTRIM = Required value of trim resistor [k]
VO−REQ = Desired (trimmed) output voltage [V]
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Y-Series
Converter
Vin
Vout
(Top View)
ON/OFF
Vin
Rload
TRIM
GND
RTRIM
Fig. B: 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 with no voltage drop in
between. Table 1 provides the trim resistor values for popular output voltages.
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 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:
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 value can be chosen depending on the required
output voltage range [k].
Control voltages with REXT = 0 and REXT = 15K 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 = 15K)
0.700
0.436
0.223
-0.097
-0.417
-0.631
-1.164
-2.017
-3.831
-4.364
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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 9.0V for the converter to turn on. Once the converter has been turned on, it will
shut off when the input voltage drops below typically 8.8V.
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 over-load or short circuit condition is removed, Vout will return to nominal
value.
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 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 7.5 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 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 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 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. C for optimum measuring thermocouple locations.
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Fig. C: Location of the thermocouple for thermal testing
Thermal Derating
Load current vs. ambient temperature and airflow rates are given in Figs. x.1 to x.2 for maximum temperature of
120°C. Ambient temperature was varied between 25 °C and 85 °C, with airflow rates from 30 to 500 LFM (0.15m/s to
2.5 m/s), and vertical and horizontal converter mounting.
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 thermographic image, or
(ii) The maximum current rating of the converter (5A)
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. C should not exceed 120 °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 9.6V, 12V and 14V.
Power Dissipation
Fig. x.4 shows the power dissipation vs. load current plot for Ta = 25ºC, airflow rate of 200 LFM (1 m/s) with vertical
mounting and input voltages of 9.6V, 12V and 14V.
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 Fig.
D.
iS
Vin
1 H
source
inductance
Vsource
Vout
Y-Series
CIN
1F
ceramic
capacitor
DC/DC
Converter
47F
ceramic
capacitor
GND
CO
47F
ceramic
capacitor
Vout
GND
Fig. D: Test setup for measuring input reflected ripple currents, is and output voltage ripple.
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6
5
5
Load Current [Adc]
Load Current [Adc]
6
4
3
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)
2
1
4
3
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)
2
1
0
0
20
30
40
50
60
70
80
20
90
30
40
60
70
80
90
Fig. 5.0V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 5.0V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1 and
maximum MOSFET temperature 120 C.
Fig. 5.0V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 5.0V converter mounted vertically
with Vin = 12V, air flowing from pin 5 to pin 1 and maximum
MOSFET temperature 120 C.
3.0
0.90
2.5
Power Dissipation [W]
0.95
0.85
Efficiency
50
Ambient Temperature [°C]
Ambient Temperature [°C]
0.80
0.75
14 V
12 V
9.6 V
0.70
2.0
1.5
1.0
14 V
12 V
9.6 V
0.5
0.65
0.0
0
1
2
3
4
5
6
0
1
Load Current [Adc]
2
3
4
5
6
Load Current [Adc]
Fig. 5.0V.3: Efficiency vs. load current and input voltage for
Vout = 5.0V converter mounted vertically with air flowing from
pin 5 to pin 1 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 = 5.0V converter mounted vertically with air flowing from
pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25 C.
Fig. 5.0V.5: Turn-on transient for Vout = 5.0V with
application of Vin at full rated load current (resistive) and
47μF external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time scale:
5 ms/div.
Fig. 5.0V.6: Output voltage ripple (10mV/div.) at full rated
load current into a resistive load with external capacitance
47μF ceramic + 1μF ceramic and Vin = 12V for Vout = 5.0V.
Time scale: 2 μs/div.
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Fig. 5.0V.8: Output voltage response for Vout = 5.0V to
negative load current step change from 5A to 2.5A with slew
rate of -5A/μs at Vin = 12V. Top trace: output voltage
(100mV/div.); Bottom trace: load current (2A/div.). Co = 47μF
ceramic. Time scale: 20μs/div.
6
6
5
5
Load Current [Adc]
Load Current [Adc]
Fig. 5.0V.7: Output voltage response for Vout = 5.0V to
positive load current step change from 2.5A to 5A with slew
rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mV/div.); Bottom trace: load current (2A/div.). Co = 47μF
ceramic. Time scale: 20μs/div.
4
3
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)
2
1
4
3
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)
2
1
0
0
20
30
40
50
60
70
80
90
20
30
40
Ambient Temperature [°C]
Fig. 3.3V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 3.3V converter mounted vertically
with Vin = 12V, air flowing from pin 5 to pin 1 and maximum
MOSFET temperature 120 C.
60
70
80
90
Fig. 3.3V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 3.3V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1 and
maximum MOSFET temperature 120 C.
3.0
0.90
2.5
Power Dissipation [W]
0.95
0.85
Efficiency
50
Ambient Temperature [°C]
0.80
0.75
14 V
12 V
9.6 V
0.70
2.0
1.5
1.0
14 V
12 V
9.6 V
0.5
0.65
0.0
0
1
2
3
4
5
6
0
1
Load Current [Adc]
Fig. 3.3V.3: Efficiency vs. load current and input voltage for
Vout = 3.3V converter mounted vertically with air flowing from
pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25 C.
2
3
4
5
6
Load Current [Adc]
Fig. 3.3V.4: Power Loss vs. load current and input voltage for
Vout = 3.3V converter mounted vertically with air flowing from
pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25 C.
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Fig. 3.3V.6: Output voltage ripple (10mv/div) at full rated load
current into a resistive load with external capacitance 47μF
ceramic + 1μF ceramic and Vin = 12V for Vout = 3.3V. Time
scale: 2 μs/div.
Fig. 3.3V.7: Output voltage response for Vout = 3.3V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
Fig. 3.3V.8: Output voltage response for Vout = 3.3V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
6
6
5
5
Load Current [Adc]
Load Current [Adc]
Fig. 3.3V.5: Turn-on transient for Vout = 3.3V with
application of Vin = 12V at full rated load current (resistive)
and 47μF external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
4
3
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)
2
1
4
3
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)
2
1
0
0
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 2.5V.1: Available load current vs. ambient temperature
and airflow rates for Vout = 2.5V converter mounted vertically
with Vin = 12V, air flowing from pin 5 to pin 1 and maximum
MOSFET temperature 120C.
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 = 2.5V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1 and
maximum MOSFET temperature 120C.
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0.95
2.5
0.90
Power Dissipation [W]
2.0
Efficiency
0.85
0.80
0.75
14 V
12 V
9.6 V
1.5
1.0
14 V
12 V
9.6 V
0.5
0.70
0.65
0.0
0
1
2
3
4
5
6
0
1
2
Load Current [Adc]
3
4
5
6
Load Current [Adc]
Fig. 2.5V.3: Efficiency vs. load current and input voltage for
Vout = 2.5V converter mounted vertically with air flowing
from pin 5 to pin 1 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 = 2.5V converter mounted vertically with air flowing
from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25
C.
Fig. 2.5V.4: Turn-on transient for Vout = 2.5V with
application of Vin = 12V at full rated load current (resistive)
and 47μF external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 2.5V.5: Output voltage ripple (10mv/div) at full rated load
current into a resistive load with external capacitance 47μF
ceramic + 1μF ceramic and Vin = 12V for Vout = 2.5V. Time
scale: 2 μs/div.
Fig. 2.5V.7: Output voltage response for Vout = 2.5V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
Fig. 2.5V.8: Output voltage response for Vout = 2.5V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
+1 866.513.2839
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© 2015 Bel Power Solutions, Inc.
BCD.00636_AA1
6
5
5
Load Current [Adc]
Load Current [Adc]
6
4
3
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)
2
1
4
3
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)
2
1
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 = 2.0V converter mounted vertically
with Vin = 12V, air flowing from pin 5 to pin 1 and maximum
MOSFET temperature 120 C.
60
70
80
90
Fig. 2.0V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 2.0V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1 and
maximum MOSFET temperature 120 C.
0.95
2.5
0.90
Power Dissipation [W]
2.0
0.85
Efficiency
50
Ambient Temperature [°C]
0.80
0.75
14 V
12 V
9.6 V
1.5
1.0
14 V
12 V
9.6 V
0.5
0.70
0.0
0.65
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Load Current [Adc]
Load Current [Adc]
Fig. 2.0V.3: Efficiency vs. load current and input voltage for
Vout = 2.0V converter mounted vertically with air flowing
from pin 5 to pin 1 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 = 2.0V converter mounted vertically with air flowing
from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25
C.
Fig. 2.0V.5: Turn-on transient for Vout = 2.0V with
application of Vin = 12V at full rated load current (resistive)
and 47μF external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 2.0V.6: Output voltage ripple (10mv/div) at full rated load
current into a resistive load with external capacitance 47μF
ceramic + 1μF ceramic and Vin = 12V for Vout = 2.0V. Time
scale: 2 μs/div.
+1 866.513.2839
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© 2015 Bel Power Solutions, Inc.
BCD.00636_AA1
Fig. 2.0V.8: Output voltage response for Vout = 2.0V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
6
6
5
5
Load Current [Adc]
Load Current [Adc]
Fig. 2.0V.7: Output voltage response for Vout = 2.0V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
4
3
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)
2
1
4
3
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)
2
1
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 = 1.8V converter mounted vertically
with Vin = 12V, air flowing from pin 5 to pin 1 and maximum
MOSFET temperature 120 C.
60
70
80
90
Fig. 1.8V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.8V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1 and
maximum MOSFET temperature 120 C.
0.95
2.5
0.90
Power Dissipation [W]
2.0
0.85
Efficiency
50
Ambient Temperature [°C]
0.80
0.75
14 V
12 V
9.6 V
1.5
1.0
14 V
12 V
9.6 V
0.5
0.70
0.65
0.0
0
1
2
3
4
5
6
0
1
2
Load Current [Adc]
Fig. 1.8V.3: Efficiency vs. load current and input voltage for
Vout = 1.8V converter mounted vertically with air flowing
from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25
C.
3
4
5
6
Load Current [Adc]
Fig. 1.8V.4: Power Loss vs. load current and input voltage
for Vout = 1.8V converter mounted vertically with air flowing
from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25
C.
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BCD.00636_AA1
Fig. 1.8V.6: Output voltage ripple (10mv/div) at full rated load
current into a resistive load with external capacitance 47μF
ceramic + 1μF ceramic and Vin = 12V for Vout = 1.8V. Time
scale: 2 μs/div.
Fig. 1.8V.7: Output voltage response for Vout = 1.8V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
Fig. 1.8V.8: Output voltage response for Vout = 1.8V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
6
6
5
5
Load Current [Adc]
Load Current [Adc]
Fig. 1.8V.5: Turn-on transient for Vout = 1.8V with
application of Vin = 12V at full rated load current (resistive)
and 47μF external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
4
3
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)
2
1
4
3
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)
2
1
0
0
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
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 from pin 5 to pin 1 and maximum
MOSFET temperature 120 C.
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 = 1.5V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1 and
maximum MOSFET temperature 120 C.
+1 866.513.2839
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© 2015 Bel Power Solutions, Inc.
BCD.00636_AA1
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
1
2
3
4
5
6
0
1
2
Load Current [Adc]
3
4
5
6
Load Current [Adc]
Fig. 1.5V.3: Efficiency vs. load current and input voltage for
Vout = 1.5V converter mounted vertically with air flowing
from pin 5 to pin 1 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 = 1.5V converter mounted vertically with air flowing
from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25
C.
Fig. 1.5V.5: Turn-on transient for Vout = 1.5V with
application of Vin = 12V at full rated load current (resistive)
and 47μF external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 1.5V.6: Output voltage ripple (10mv/div) at full rated load
current into a resistive load with external capacitance 47μF
ceramic + 1μF ceramic and Vin = 12V for Vout = 1.5V. Time
scale: 2 μs/div.
Fig. 1.5V.7: Output voltage response for Vout = 1.5V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
Fig. 1.5V.8: Output voltage response for Vout = 1.5V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
+1 866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00636_AA1
6
5
5
Load Current [Adc]
Load Current [Adc]
6
4
3
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)
2
1
4
3
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)
2
1
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 = 1.2V converter mounted vertically
with Vin = 12V, air flowing from pin 5 to pin 1 and maximum
MOSFET temperature 120 C.
Fig. 1.2V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.2V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1 and
maximum MOSFET temperature 120 C.
0.90
2.0
Power Dissipation [W]
0.85
Efficiency
0.80
0.75
0.70
14 V
12 V
9.6 V
1.5
1.0
14 V
12 V
9.6 V
0.5
0.65
0.60
0.0
0
1
2
3
4
5
6
0
1
2
Load Current [Adc]
3
4
5
6
Load Current [Adc]
Fig. 1.2V.3: Efficiency vs. load current and input voltage for
Vout = 1.2V converter mounted vertically with air flowing
from pin 5 to pin 1 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 = 1.2V converter mounted vertically with air flowing
from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25
C.
Fig. 1.2V.5: Turn-on transient for Vout = 1.2V with
application of Vin = 12V at full rated load current (resistive)
and 47μF external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 1.2V.6: Output voltage ripple (10mv/div) at full rated load
current into a resistive load with external capacitance 47μF
ceramic + 1μF ceramic and Vin = 12V for Vout = 1.2V. Time
scale: 2 μs/div.
+1 866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00636_AA1
Fig. 1.2V.8: Output voltage response for Vout = 1.2V to a
negative load current step change from 5A to 2.5A with a
slew rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
6
6
5
5
Load Current [Adc]
Load Current [Adc]
Fig. 1.2V.6: Output voltage response for Vout = 1.2V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
4
3
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)
2
1
4
3
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)
2
1
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 = 1.0V converter mounted vertically
with Vin = 12V, air flowing from pin 5 to pin 1 and maximum
MOSFET temperature 120 C.
Fig. 1.0V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.0V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1 and
maximum MOSFET temperature 120 C.
0.90
2.0
Power Dissipation [W]
0.85
Efficiency
0.80
0.75
0.70
14 V
12 V
9.6 V
1.5
1.0
14 V
12 V
9.6 V
0.5
0.65
0.60
0.0
0
1
2
3
4
5
6
0
1
Load Current [Adc]
Fig. 1.0V.3: Efficiency vs. load current and input voltage for
Vout = 1.0V converter mounted vertically with air flowing from
pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25C.
2
3
4
5
6
Load Current [Adc]
Fig. 1.0V.4: Power Loss vs. load current and input voltage for
Vout = 1.0V converter mounted vertically with air flowing from
pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and Ta = 25 C.
+1 866.513.2839
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© 2015 Bel Power Solutions, Inc.
BCD.00636_AA1
Fig. 1.0V.5: Turn-on transient for Vout = 1.0V with
application of Vin = 12V at full rated load current (resistive)
and 47μF external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 1.0V.6: Output voltage ripple (10mv/div) at full rated load
current into a resistive load with external capacitance 47μF
ceramic + 1μF ceramic and Vin = 12V for Vout = 1.0V. Time
scale: 2 μs/div.
Fig. 1.0V.7: Output voltage response for Vout = 1.0V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
Fig. 1.0V.8: Output voltage response for Vout = 1.0V to a
negative load current step change from 5A to 2.5A with a
slew rate of 5A/μs at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47μF
ceramic. Time scale: 20 μs/div.
+1 866.513.2839
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© 2015 Bel Power Solutions, Inc.
BCD.00636_AA1
2
1
3
4
5
PAD/PIN CONNECTIONS
Pad/Pin #
Function
1
ON/OFF
2
Vout
3
TRIM
4
GND
5
Vin
TOP VIEW
SIDE VIEW
YM12S Platform Notes
•
•
•
•
•
•
YM12S Pinout (Surface Mount)
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Gold over Nickel
Module Weight: 0.079 oz [2.26 g]
Module Height: 0.260” Max., 0.234” Min.
Recommended Surface-Mount Pads:
Min. 0.080” X 0.112” [2.03 x 2.84]
Product Series
Input Voltage
Mounting Scheme
Rated Load Current
YM
12
S
05
Y-Series
9.6 V – 14 V
S Surface-Mount
RoHS Compatible
–
5A
(0.7525 V to 5.5 V)
No Suffix RoHS
lead-solder-exempt compliant
G RoHS compliant for all six
substances
The example above describes P/N YM12S05G: 9.6V – 14V input, surface mount, 5A at 0.7525V to 5.5V output, and RoHS compliant.
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.
+1 866.513.2839
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© 2015 Bel Power Solutions, Inc.
BCD.00636_AA1
