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PDF YNC12S20 Data sheet ( Hoja de datos )
| Número de pieza | YNC12S20 | |
| Descripción | DC-DC Converter | |
| Fabricantes | Power-One | |
| Logotipo |  |
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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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1 page  
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YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
Operation
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
NexTM-c Series
SENSE
Converter
R*
(Top View)
ON/OFF
Vout
Vin
GND
TRIM
Rload
CONTROL
INPUT
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.
OCT 12, 2006 revised to APR 23, 2007
Page 5 of 28
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YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
Fig. 5.0V.4: Turn-on transient for Vout = 5.0 V with
application of Vin at full rated load current
(resistive) and 100 μF external capacitance at Vin =
12 V. Top trace: Vin (10 V/div.); Bottom trace:
output voltage (1 V/div.); Time scale: 2 ms/div.
Fig. 5.0V.5: Output voltage ripple (20 mV/div.) at full
rated load current into a resistive load with external
capacitance 100 μF ceramic + 1 μF ceramic and Vin =
12 V for Vout = 5.0 V. Time scale: 2 μs/div.
Fig. 5.0V.6: Output voltage response for Vout = 5.0 V
to positive load current step change from 10 A to 20 A
with slew rate of 5 A/μs at Vin = 12 V. Top trace:
output voltage (200 mV/div.); Bottom trace: load
current (5 A/div.). Co = 100 μF ceramic. Time scale:
20 μs/div.
Fig. 5.0V.7: Output voltage response for Vout = 5.0 V
to negative load current step change from 20 A to
10 A with slew rate of -5 A/μs at Vin = 12 V. Top
trace: output voltage (200 mV/div.); Bottom trace: load
current (5 A/div.). Co = 100 μF ceramic. Time scale:
20 μs/div.
OCT 12, 2006 revised to APR 23, 2007
Page 11 of 28
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| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet YNC12S20.PDF ] | |
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