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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NCP1568DC48WGEVB
PCB
Figure 3. Top View of Mainboard PCB
Figure 4. Bottom View of Mainboard PCB
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NCP1568DC48WGEVB
T1 TRANSFORMER DESIGNS
Figure 5.
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NCP1568DC48WGEVB
)
Efficiency
Test Condition: all efficiency are tested at board end
At 75% load At 100% load
95
94
93
92
91
90
89
88
Efficiency(%)
87
86
85
120 160 320 395
Vdc
Figure 6. Efficiency
95
94
93
92
91
90
89
88
Efficiency(%)
87
86
85
120 160 320 395
Vdc
(CH1 Vsw, CH2: Vadrv, CH3: Vsec−drain, CH4: Vsyn−drv)
Figure 7. Startup Waveform at 120 Vdc
120 Vdc (CH1 Vsw, CH2: Vadrv, CH3: Vsec−drain, CH4: Vsyn−drv) 395 Vdc (CH1 Vsw, CH2: Vadrv, CH3: Vsec−drain, CH4: Vsyn−drv
Figure 8. Working Waveform at Full Load
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NCP1568DC48WGEVB
(CH2: Io, CH3: Vsec−drain, CH4: Vo) (CH2: Io, CH3: Vsec−drain, CH4: Vo)
Figure 9. Output Ripple at Full Load
Test condition: 0 − 4 A, 10 ms cycle, 125 mA/ms, 1 m cable,
tested at E−load
Figure 10. Dynamic Test at 160 Vdc
Test condition: 0 − 2 A, 10 ms cycle, 125 mA/ms, 1 m cable,
tested at E−load
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NCP1568DC48WGEVB
(CH2: Io, CH3: Vsec−drain, CH4: Vo) (CH2: Io, CH3: Vsec−drain, CH4: Vo)
395 Vdc input, 500 MHz BW
395 Vdc input, 20 MHz BW
Test condition: 0.1 A − 4.0 A, 10 ms cycle, 125 mA/ms, 1 m cable,
tested at E−load
Figure 11. Dynamic Test at 160 Vdc
(CH2: Vadrv, CH3: Vsec−drain)
Figure 12. Secondary Voltage Stress during DCM to ACF Mode Transition
Test condition: 1 A − 4 A, 10 ms cycle, 125 mA/ms, 1 m cable,
tested at E−load
(CH2: Vadrv, CH3: Vsec−drain)
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NCP1568DC48WGEVB
Table 1. THERMAL IMAGE @ 12 V / 4 A Output
Input
Component Side
Back side
120 Vdc
160 Vdc
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NCP1568DC48WGEVB
320 Vdc
395 Vdc
Table 1. THERMAL IMAGE @ 12 V / 4 A Output (continued)
Input Back sideComponent Side
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NCP1568DC48WGEVB
T able 2. BILL OF MATERIAL
Item
Qty
Reference
Type
Part Name
Package
MFR
Value
Description
14C1 C3 C29
Ceramic
/885012105018
402
Wurth
0.1 uF,
Capacitor, Ceramic,
21C52
Ceramic
/885012206071
603
Wurth
0.1 uF,
Capacitor, Ceramic,
34C6 C26
Ceramic
C3225X7T2W224K
1210
TDK
0.22 uF,
Capacitor, Ceramic,
42C9 C34
Ceramic
/885012205055
402
Wurth
101
Capacitor, Ceramic,
51C42
Ceramic
/885012205061
402WE102
Capacitor, Ceramic,
62C46−47
Ceramic
/885012205061
402WE102
Capacitor, Ceramic,
71C8
Ceramic
/885012206076
603
Wurth
1 uF,
Capacitor, Ceramic,
81C43
Ceramic
/885012206076
603WE1 uF,
Capacitor, Ceramic,
91C12
Ceramic
C1608X7R2A222K
603
TDK
2.2 nF,
Capacitor, Ceramic,
104C56−57
Ceramic
C3216X5R1V226M
1206
TDK
22 uF
Capacitor, Ceramic,
111C27
Ceramic
C1608X6S1C475M
603
TDK
4.7 uF,
Capacitor, Ceramic,
121C10
Ceramic
CS65−B2GA101K-
Lead type
TDK
470 pF,
Y Capacitor,safety
131D6
Switching
BAS21HT1G
SOD323
ON
0.2 A,
Swiching diode, 0.2 A,
142D26 D29
Schotty
BAT54XV2T1G
SOD523
ON
0.2 A,
Schotty diode, SMD
151D22
Ultrafast
ES1JFL
SOD123
ON
1 A,
Ultrafast diode, SMD
161D1
Schotty
NTSAF5100T3G
SOD123FL
ON
5 A,
Schotty Rectifier, 5 A,
171F1
Fuse
20T−016H
Axial lead
Hollyfuse
1.6 A,
Micro Fuse, 1.6 A /
181U8
voltage
NCP431ACSNT1G
SOT23
ON
PROGRAMMABLE
191U2
ACF con-
NCP1568S02AD-
TSSOP16
ON
ACF controller
201U7
Syn. recti-
NCP4306AADZZ-
SO8ONSyn. Rectified Con-
211U1
HB driver
NCP51530AMN-
DFN10
ON
HB driver
221NTC1
NTC
SD-
603
Shunlord
100k
replaced by 13k resis-
231U4
Optical
FODM1009
LSOP4
ON
optical coupler, stan-
241L6
SMD In-
/744314200
7050WE2.2 uH
WE−HCI SMD Flat
252R6 R72
Resistor
Std
402
Std1Resistor, Chip, 1/16W,
261R18
Resistor
Std
402
Std
1.8k
Resistor, Chip, 1/16W,
C44
C45 C48
C60 C62
Capacitor
Capacitor
Capcitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capcitor
Capacitor
Capcitor
diode
160AC
YNKA
25 V
25 V
450 V
25 V
25 V
100 V
16 V
Y1
250 V
25 V, 10%
25 V, 10%
Chip, 10%
50 V, 10%
50 V, 10%
50 V, 5%
10%
25 V, 10%
SMD, 5%
SMD, 5%
16 V, 10%
standard approved,
10%
250 V
diode
diode
rectifier
reference
troller
fied controller
coupler
ductor
BR2G
ZAMNTWG
TWG
NT1608X104J4250HTF
4X4
30 V
600 V
100 V
250 Vac
100 V
250 V
PRECISION REFERENCE
troller
tor
dard SOP package
Wire High Current Inductor
1%
1%
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T able 2. BILL OF MATERIAL (continued)
273R32
Resistor
Std
402
Std
100k
Resistor, Chip, 1/16W,
281R37
Resistor
Std
402
Std
120k
Resistor, Chip, 1/16W,
291R13
Resistor
Std
402
Std
150
Resistor, Chip, 1/16W,
301R17
Resistor
Std
402
Std
16k
Resistor, Chip, 1/16W,
312R1 R22
Resistor
Std
402
Std1KResistor, Chip, 1/16W,
321R9
Resistor
Std
402
Std22Resistor, Chip, 1/16W,
331R8
Resistor
Std
603
Std
24k
Resistor, Chip, 1/16W,
342R89−90
Resistor
Std
402
Std
4.7
Resistor, Chip, 1/16W,
352R2 R20
Resistor
Std
402
Std
47k
Resistor, Chip, 1/16W,
361R3
Resistor
Std
402
Std
510
Resistor, Chip, 1/16W,
371R45
Resistor
Std
402
Std
56k
Resistor, Chip, 1/16W,
381R7
Resistor
Std
402
Std
91k
Resistor, Chip, 1/16W,
391R29
Resistor
Std
402
StdncResistor, Chip, 1/16W,
401R4
Resistor
ERJ8BQFR062V
1206
Panasonic
0.62
Resistor, Chip, 1/2W,
411R5
Resistor
ERJ8BQFR068V
1206
Panasonic
0.68
Resistor, Chip, 1/2W,
421R31
Resistor
Std
1206
Std1kResistor, Chip, 1/4W,
432R12 R34
Resistor
Std
805
Std20Resistor, Chip, 1/5W,
441R83
Resistor
Std
1206
Std
300K
Resistor, Chip, 1/4W,
451T1
Trans-
RM7
TH type
Wurth
RM7, 8Pin
462C13−14
Electrolyt-
PX471M016E120P
6.3 mm x
CapXon
470 uF,
size: 6.3 mm x 12 mm
471C21
ECAP
KF Series
5 mm x
CapXon
47 uF,
size: 6.3 mm x 11 mm
481C32
ECAP
KF Series
8 mm x
CapXon
6.8 uF,
size: 8 mm x 12 mm
491Q18
MOSFET
NTMFS6B03NT1G
QFN5X6
ON
MOSFET, NChan,
502Q23−24
MOSFET
IPL60R360P6S
ThinkPAK5-
INFINEON
MOSFET, NChan,
511ZD11
zener
MM3Z11VT1G
SOD323
ON
16v
GENERIC ZENER−
52412V4A
connec-
Std
Ø1mm
Std
connection ternimal or
Item DescriptionValueMFRPackagePart NameTypeReferenceQty
NCP1568DC48WGEVB
R91−92
1%
1%
1%
1%
1%,
1%
1%
1%
1%
1%
1%
1%
1%,
GND V+
V−
former
ic solid
capacitor
tion ternimal
12 mm
11 mm
12 mm
X6
1%
1%
1%
1%
1%
16 V
25 V
420 V
100 V
600 V
DIODE
wire
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NCP1568DC48WGEVB
References
ON Semiconductor datasheet for NCP1568, NCP51530, NCP4306, NTMFS6B03
ON Semiconductor Design Notes DN05043
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