YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
The
Features
RoHS lead-free solder and lead-solder-exempted
products are available
Delivers up to 20 A (100 W)
Extended input range 9.6 V – 14 V
High efficiency (0.94 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: 0.22 oz [6.12 g]
Coplanarity less than 0.003”, maximum
Synchronous Buck Converter topology
Source and sink capable
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 = TBD Million Hours
All materials meet UL94, V-0 flammability rating
UL 60950-1 recognition in the US & Canada, and TUV
SUD certification per IEC/EN 60950-1
Products: Y-Series
Applications
Intermediate Bus Architectures
Telecommunications
Data communications
Distributed Power Architectures
Servers, workstations
Benefits
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
Description
Power-One’s point-of-load converters are recommended for use with regulated bus converters in an
Intermediate Bus Architecture (IBA). The YNC12S20 non-isolated DC-DC converter delivers up to 20 A of
output current in an industry-standard surface-mount package. Operating from a 9.6 to 14 VDC input, the
YNC12S20 converter is an ideal choice for Intermediate Bus Architectures where point-of-load power delivery
is generally a requirement. It provides a resistor-programmable regulated output voltage of 0.7525V to 5.5V.
The Y-Series converters provide exceptional thermal performance, even in high temperature environments
with minimal airflow. This is accomplished through the use of circuit, packaging and processing techniques to
achieve 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.
ZD-02137 Rev. 2.1 21-Jun-10
Page 1 of 28
www.power-one.com
YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
Electrical Specifications
Conditions: T
A
=25ºC, Airflow=200 LFM (1 m/s), Vin=12 VDC, Vout = 0.7525 - 5.5V, unless otherwise specified.
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Ambient Temperature
Storage Temperature
Continuous
NOTES
MIN
-0.3
-40
-55
TYP
MAX UNITS
15
85
125
VDC
°C
°C
kHz
5.5
0.5
VDC
VDC
FEATURE CHARACTERISTICS
Switching Frequency
Output Voltage Programming Range
1
Remote Sense Compensation
Turn-On Delay Time
With Vin = (Module Enabled, then Vin applied)
With Enable (Vin = Vin(nom) applied, then enabled)
Rise time
ON/OFF Control (Positive Logic)
Module Off
Module On
ON/OFF Control (Negative Logic)
Module Off
Module On
Note:
1. The output voltage should not exceed 5.5V (taking into account both the programming and remote sense compensation).
2. Converter is on if ON/OFF pin is left open.
3. Note that start-up time is the sum of turn-on delay time and rise time.
2
2
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 10% to 90%, full resistive load
-5
2.4
2.4
-5
3
3
4
0.8
V
IN
V
IN
0.8
0.7525
ms
ms
ms
VDC
VDC
VDC
VDC
ZD-02137 Rev. 2.1 21-Jun-10
Page 2 of 28
www.power-one.com
YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
Electrical Specifications (continued)
Conditions: T
A
=25ºC, Airflow=200 LFM (1 m/s), Vin=12 VDC, Vout = 0.7525 - 5.5V, 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
8.5
MAX UNITS
14
VDC
VDC
VDC
11.1
7.6
5.9
4.8
4.4
3.8
3.1
2.7
2.2
ADC
ADC
ADC
ADC
ADC
ADC
ADC
ADC
ADC
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
P-P
dB
20 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
Input Stand-by Current (Module disabled)
Input No Load Current (Module enabled)
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
80
62
52
47
45
43
41
39
35
TBD
72
Input Reflected-Ripple Current -
i
s
Input Voltage Ripple Rejection
See Fig. F for setup. (BW=20 MHz)
120 Hz
ZD-02137 Rev. 2.1 21-Jun-10
Page 3 of 28
www.power-one.com
YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
Electrical Specifications (continued)
Conditions: T
A
=25 ºC, Airflow=200 LFM (1 m/s), Vin=12 VDC, Vout = 0.7525 – 5.5 V, unless otherwise specified.
PARAMETER
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
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 - 20MHz bandwidth (Fig. F)
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 , RMS Value
NOTES
MIN
-1.5
TYP
Vout
MAX UNITS
+1.5
%Vout
Full resistive load
From no load to full load
-2.5
Over line, load and temperature
V
OUT
= 0.7525 VDC
V
OUT
= 5.0 VDC
Plus full load (resistive)
2
10
+2.5
mV
mV
%Vout
10
35
15
50
1,000
5,000
mV
P-P
mV
P-P
μF
μF
A
A
A
0
26
Short=10 mΩ, continuous
Co = 100μF ceramic + 470 μF POS
Co = 100 μF ceramic + 470 μF POS
Full load (20A)
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
94
91
89
87
86
84
81.5
78
73.5
6
140
45
140
45
20
DYNAMIC RESPONSE
Load current change from 10A – 20A, di/dt = 5 A/μS
Settling Time (V
OUT
< 10% peak deviation)
Unloading current change 20A – 10A, di/dt = -5 A/μS
Settling Time (V
OUT
< 10% peak deviation)
mV
µs
mV
µs
%
%
%
%
%
%
%
%
%
EFFICIENCY
ZD-02137 Rev. 2.1 21-Jun-10
Page 4 of 28
www.power-one.com
YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
Operation
Vin
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 in order to ensure stability of the
converter and reduce input ripple voltage. The
converter has an internal input capacitance of 40
μF with very low ESR (ceramic capacitors).
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-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.
YNC12S20 has been designed for stable
operation with or without external capacitance.
Low ESR ceramic capacitors placed as close as
possible to the load (Min 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. 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.
Vin
Nex
-c
Series
Converter
(Top View)
TM
SENSE
R*
ON/OFF
Vout
Rload
GND
CONTROL
INPUT
TRIM
R* is for negative logic option only
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.
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 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
2.3V – 5V
- 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 a solid ground
plane is recommended to provide low voltage
drop.
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.
ZD-02137 Rev. 2.1 21-Jun-10
Page 5 of 28
www.power-one.com
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