YS12S10 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 10 A
The
Features
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
UL60950 recognition in U.S. & Canada, and
DEMKO certification per IEC/EN60950
Products: Y-Series
Applications
Intermediate Bus Architectures
Telecommunications
Data communications
Distributed Power Architectures
Servers, workstations
Benefits
High efficiency– no heat sink required
(0.95 at 5 VDC output)
Reduces total solution board area
Tape and reel packing
Compatible with pick & place equipment
Minimizes part numbers in inventory
Low cost
Description
Power-One’s point-of-load converters are recommended for use with regulated bus converters in an Intermediate
Bus Architecture (IBA). The YS12S10 non-isolated 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.
MCD10206 Rev. 1.0, 24-Jun-10
Page 1 of 27
www.power-one.com
YS12S10 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 10 A
Electrical Specifications
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 12 VDC, Vout = 0.7525 - 5.5 VDC, unless otherwise specified.
Parameter
Absolute Maximum Ratings
Input Voltage
Operating Ambient Temperature
Storage Temperature
Continuous
Notes
Min
-0.3
-40
-55
Typ
Max
15
85
125
Units
VDC
°C
°C
kHz
Feature Characteristics
Switching Frequency
Output Voltage Trim Range
1
Remote Sense Compensation
1
300
By external resistor, See Trim Table 1
Full resistive load
From Vin = Vin(min) to Vo = 0.1* Vo(nom)
From enable to Vo = 0.1*Vo(nom)
From 0.1*Vo(nom) to 0.9*Vo(nom)
-5
2.4
3
0.7525
5.5
0.5
VDC
VDC
Turn-On Delay Time
With Vin (Converter Enabled,
then Vin applied)
With Enable (Vin = Vin(nom) applied,
then enabled)
Rise time
2
(Full resistive load)
ON/OFF Control (Positive Logic)
3
Converter Off
Converter On
ON/OFF Control (Negative Logic)
Converter Off
Converter On
3
3
4
0.8
Vin
Vin
0.8
ms
ms
ms
VDC
VDC
VDC
VDC
2.4
-5
Additional Notes:
1
The output voltage should not exceed 5.5 VDC.
2
Note that the startup time is the sum of turn-on delay time and rise time.
3
The converter is ON if the ON/OFF pin is left open.
MCD10206 Rev. 1.0, 24-Jun-10
Page 2 of 27
www.power-one.com
YS12S10 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 10 A
Electrical Specifications (continued)
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 12 VDC, Vout = 0.7525 - 5.5 VDC, unless otherwise specified.
Parameter
Input Characteristics
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
Turn-off Threshold
Maximum Input Current
Notes
Min
9.6
Typ
12
9.0
8.5
Max
14
Units
VDC
VDC
VDC
10 ADC Out @ 9.6 VDC In
V
OUT
= 5.0 VDC
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 2.0 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
V
OUT
= 0.7525 VDC
5.5
3.7
2.8
2.3
2.1
1.8
1.5
1.3
1.1
5
V
OUT
= 5.0 VDC
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 2.0 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
V
OUT
= 0.7525 VDC
76
60
45
41
38
35
33
30
28
36
34
32
31
30
29
26
23
20
72
ADC
ADC
ADC
ADC
ADC
ADC
ADC
ADC
ADC
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
P-P
mA
P-P
mA
P-P
mA
P-P
mA
P-P
mA
P-P
mA
P-P
mA
P-P
mA
P-P
dB
Input Stand-by Current (Converter disabled)
Input No Load Current (Converter enabled)
Input Reflected-Ripple Current -
i
s
See Fig. D for setup. (BW = 20 MHz)
V
OUT
= 5.0 VDC
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 2.0 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
V
OUT
= 0.7525 VDC
Input Voltage Ripple Rejection
120 Hz
MCD10206 Rev. 1.0, 24-Jun-10
Page 3 of 27
www.power-one.com
YS12S10 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 10 A
Electrical Specifications (continued)
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 12 VDC, Vout = 0.7525 - 5.5 VDC, unless otherwise specified.
Parameter
Output Characteristics
Output Voltage Set Point (no load)
Output Regulation
4
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
Peak-to-Peak
Peak-to-Peak
External Load Capacitance
Min ESR > 1mΩ
Min ESR > 10 mΩ
Output Current Range
Output Current Limit Inception (I
OUT
)
Output Short-Circuit Current
Notes
Min
-1.5
Typ
Vout
1
5
Max
+1.5
2
12
+2.5
Units
%Vout
mV
mV
%Vout
Full resistive load
From no load to full load
-2.5
Over line, load and temperature (Fig. D)
V
OUT
= 1.0 VDC
V
OUT
= 5.0 VDC
Plus full load (resistive)
10
25
20
40
1,000
5,000
mV
P-P
mV
P-P
μF
μF
ADC
ADC
Arms
mV
µs
mV
µs
mV
µs
mV
µs
%
%
%
%
%
%
%
%
%
0
20
Short = 10 mΩ, continuous
Co = 10
μF
ceramic. + 1
μF
ceramic
Co = 10
μF
ceramic + 1
μF
ceramic
Co = 330
μF
polymer capacitors
Co = 330
μF
polymer capacitors
Full load (10 A)
V
OUT
= 5.0 VDC
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 2.0 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
V
OUT
= 0.7525 VDC
95.0
94.0
93.0
91.5
90.5
89.5
87.5
86.0
84.0
3
150/(180
5
)
30
150/(180 )
30
100/(120 )
55
100/(120 )
55
5
5
5
10
Dynamic Response
Iout step from 5 A to 10 A with di/dt = 5 A/μs
Settling Time (V
OUT
< 10% peak deviation)
Iout step from 10 A to 5 A with di/dt = -5 A/μs
Settling Time (V
OUT
< 10% peak deviation)
Iout step from 5 A to 10 with di/dt = 5 A/μs
Settling Time (V
OUT
< 10% peak deviation)
Iout step from 10 A to 5 A with di/dt = -5 A/μs
Settling Time (V
OUT
< 10% peak deviation)
Efficiency
Additional Notes:
4
Trim resistor connected across the GND and TRIM pins of the converter.
5
For V
OUT
= 5.0 VDC only. See the waveforms section for dynamic response and settling time for different output voltages.
MCD10206 Rev. 1.0, 24-Jun-10
Page 4 of 27
www.power-one.com
YS12S10 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 10 A
Operations
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*
Vin
Y-Series
Converter
(Top View)
SENSE
ON/OFF
Vout
Rload
GND
CONTROL
INPUT
TRIM
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.
Vin
Y-Series
Converter
(Top View)
ON/OFF
Vin
Rload
SENSE
Rw
Vout
GND
TRIM
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.
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MCD10206 Rev. 1.0, 24-Jun-10
Page 5 of 27
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