ON Semiconductor NCP1568DC48WGEVB User Manual
NCP1568DC48WGEVB
Output Specification
Output Voltage
12 V
Nominal Current
4 A
Max Current
4 A
Min Current
Zero
Avg. Efficiency
>94% @ 12 V / 4 A at board end, 160 &
Ripple
<80 mV
Standby Power
<150 mW
Power Density
48 W/in^3
Protection
Adaptive UVP, OVP, OVP, SCP, OTP
Size
40 mm x 24 mm x 17 mm
Device
Application
Input Voltage
Output Power
Topology
I/O Isolation
NCP1568S02DBR2G
Server AUX power
120 Vdc to
48 W
Flyback
Isolated
48 W Server AUX Power
Supply Solution Evaluation
Board User's Manual
Circuit Description
This design note describes a 48 W, wide range DC input, constant
voltage power supply, NCP1568DC48WGEVB, intended for Server
AUX power supply and others DC input applications requiring fixed
voltage output, low profile, high efficiency and high power density.
The NCP1568DC48WGEVB uses an Active Clamp Flyback (ACF)
topology utilizing ON Semiconductor NCP1568 ACF controller,
NCP51530A half−bridge driver, NCP4306 synchronous rectified
controller and secondary NTMFS6B03 synchronous MOSFET. This
Design Note provides the complete circuit schematic details, PCB and
BOM for the NCP1568 48 W DC input Power adapter solution that
supports fixed 12 V output voltage and 4 A current.
This design uses an ACF topology to implement a Zero Voltage
Switching (ZVS) operation with high switching frequency and
secondary CLC circuitry to implement secondary Zero Current
Switching (ZCS). In order to keep cost low, (2) SJ MOSFETs are used
on the primary side for power switching.
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EVAL BOARD USER’S MANUAL
Key Features
• DC Input from 120 V to 400 V
• ACF Topology with ZVS Operation
• High Voltage Startup Current eliminates Startup
Resistor
• High Frequency Operation to allow Low Profile
Transformer: RM7 Transformer
• ACF Operation Frequency Range from 110 kHz to
400 kHz
• Quite Skip and Flyback DCM Operation with
Frequency Foldback at No Load and Light Load
• Rated Output Power: 12 V, 4 A
• Ripple and Noise <80 mV
• Efficiency: >94% at 156 Vdc and 320 Vdc @ Full Load
• Output OVP
• Output OCP, SCP
• Open Loop Protection
• Board Size: 40 mm x 24 mm x 17 mm
• Power Density: 48 W/inch^3
320 Vdc
NCP51530AMNTWG
NCP4306AADZZZAMNTWG
NTMFS6B03NT1G
© Semiconductor Components Industries, LLC, 2019
May, 2020 − Rev. 1
supply and other DC
input applications
400 Vdc
1 Publication Order Number:
EVBUM2661/D
(3 kV)
NCP1568DC48WGEVB
Top View Bottom View
Figure 1. Evaluation Board Photos
CIRCUIT SCHEMATIC
Figure 2. Circuit Schematic
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2
NCP1568DC48WGEVB
PCB
Figure 3. Top View of Mainboard PCB
Figure 4. Bottom View of Mainboard PCB
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3
NCP1568DC48WGEVB
T1 TRANSFORMER DESIGNS
Figure 5.
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4
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