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YNC12S20 Schematic ( PDF Datasheet ) - Power-One

Teilenummer YNC12S20
Beschreibung DC-DC Converter
Hersteller Power-One
Logo Power-One Logo 



Gesamt 28 Seiten
		
YNC12S20 Datasheet, Funktion
www.DataSheet4U.com
YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
The 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
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 recognition in U.S. & Canada, and DEMKO
certification per IEC/EN 60950
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.
OCT 12, 2006 revised to APR 23, 2007
Page 1 of 28
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YNC12S20 Datasheet, Funktion
www.DataSheet4U.com
YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
Vin
NexTM-c Series
SENSE
Converter
ON/OFF
(Top View)
Vout
Rw
Vin
GND
TRIM
Rload
Rw
Fig. B: Remote sense circuit configuration.
Because the sense lead carries minimal current,
large traces on the end-user board are not
required. However, sense traces should be
located close to a ground plane to minimize
system noise and ensure 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 0.5V 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
0.7525V to 5.5V 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:
RTRIM
=
10.5
(VO-REQ - 0.7525)
1
[kΩ]
where,
RTRIM = Required value of trim resistor [kΩ]
VOREQ = Desired (trimmed) output voltage [V]
Vin
NexTM-c Series
SENSE
Converter
ON/OFF
(Top View)
Vout
Vin
GND
TRIM
Rload
RTRIM
Fig. C: Configuration for programming output voltage.
Note that the tolerance of a trim resistor directly
affects the output voltage tolerance. It is
recommended to use standard 1% or 0.5%
resistors; for tighter tolerance, two resistors in
parallel are recommended rather than one
standard value from Table 1.
The ground pin of the trim resistor should be
connected directly to the converter GND pin (Pin
5) with no voltage drop in between. Table 1
provides the trim resistor values for popular output
voltages.
Table 1: Trim Resistor Value
V0-REG [V]
RTRIM [k]
The Closest
Standard Value [k]
0.7525
open
1.0 41.2
41.2
1.2 22.46
22.6
1.5 13.0
13.0
1.8 9.0
9.09
2.0 7.4
7.32
2.5 5.0
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 the TRIM pin and the
programming voltage source. Control Voltage can
be calculated by the formula:
VCTRL
=
0.7
(1 +
REXT)(VO-REQ
15
-
0.7525)
where,
[V]
OCT 12, 2006 revised to APR 23, 2007
Page 6 of 28
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6 Page







YNC12S20 pdf, datenblatt
www.DataSheet4U.com
YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
25
20
15
10
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
5
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
0
20 30 40 50 60 70 80 90
Ambient Temperature [°C]
Fig. 3.3V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 3.3 V converter
mounted vertically with Vin = 12 V, and maximum
MOSFET temperature 120 °C.
1.00
0.95
0.90
0.85
0.80
14 V
12 V
9.6 V
0.75
0 4 8 12 16 20 24
Load Current [Adc]
Fig. 3.3V.2: Efficiency vs. load current and input
voltage for Vout = 3.3 V converter mounted vertically
with air flowing at a rate of 200 LFM (1 m/s) and Ta =
25 °C.
10
8
6
4
14 V
12 V
2 9.6 V
0
0 4 8 12 16 20 24
Load Current [Adc]
Fig. 3.3V.3: Power loss vs. load current and input
voltage for Vout = 3.3 V converter mounted vertically
with air flowing at a rate of 200 LFM (1 m/s) and Ta =
25 °C.
OCT 12, 2006 revised to APR 23, 2007
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