ON Semiconductor NCP1568D User Manual
EVBUM2776/D
Specifications
Output Voltage
5, 9, 12, 15, 20 V
Ripple
< 2%
Nominal Current
3 A / 2.25 A @ 20 V
Max Current
3 A / 2.25 A @ 20 V
Min Current
Zero
Device
Application
Input Voltage
Output Power
Topology
I/O Isolation
NCP1568D
PoE to USB−PD
37 Vdc − 57 Vdc
45 W
Active Clamp
Isolated
NCP1568D PoE Input
USB-PD Evaluation Board
User's Manual
Circuit Description
This evaluation board manual describes a 45 W universal
input 5 V, 9 V, 15 V and 20 V output evaluation board for
Power over Ethernet to USB−PD applications. This featured
power supply is an active−clamp flyback topology utilizing
ON Semiconductor’s NCP1568D PWM controller,
NCP51530 HB Driver, NCP4308 SR Controller and
FUSB3307 USB−PD Controller . This design note provides
complete circuit schematic, PCB, BOM and transformer
information of the evaluation board. It also provide
efficiency, transient response, output ripple and thermal data
of the evaluation board.
This design utilized NCP1568 and NCP51530 for the
active clamp flyback topology. Active clamp flyback
topology effectively recycles the leakage energy. Another
feature of this topology is the ZVS operation of the power
MOSFETS. Because of no leakage losses and ZVS
operation, this topology is suited for high frequency
operation which results in size reduction of the transformer.
Hence Active clamp flyback topology is well suited for high
power density sub 100 W power supplies.
NCP1568D is a highly integrated DC−DC PWM
controller designed to implement an active clamp flyback
topology. It features adaptive frequency scheme which
optimizes frequency of operation and hence the efficiency
over all load and input voltages. The NCP1568 features a
HV startup circuit.
NCP51530 is a 700 V high side and low side driver with
2 A current drive capability for DC−DC power supplies and
inverters. NCP51530 offers best in class propagation delay,
low quiescent current and low switching current at high
frequencies of operation. This device is tailored for highly
efficient power supplies operating at high frequencies.
NCP4308 is high performance driver tailored to control a
synchronous rectification MOSFET in switch mode power
supplies.
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EVAL BOARD USER’S MANUAL
FUSB3307 is a fully compliant, highly integrated USB
Power Delivery (PD) power source controller that can
control a DC−DC port power regulator or the opto−coupler
in the secondary side of an AC−DC adapter.
Key Features
• PoE Compatible DC−DC Input Voltages (37 V – 57 V)
• High Full Load and Average Efficiency
• Low Standby Power
• Very Low Ripple and Noise
• High Frequency Operation up to 400 kHz
• Thermal and OVP Protection
• Adaptive Frequency Operation based on Input and
Output Load Conditions
• Adaptive ZVS Operation
• Inherent SCP and OCP Protection
• Board Dimensions: 2.23” x 1.34” x 0.58”
NCP51530
NCP4308D
FUSB3307
FDMS86255
FDMS86101
© Semiconductor Components Industries, LLC, 2020
November, 2020 − Rev. 0
Adapter
Flyback
1 Publication Order Number:
EVBUM2776/D
EVBUM2776/D
Figure 1. Top View of the Evaluation Board
Figure 2. Full View of the Evaluation Board
Figure 3. View of the Daughter Card
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EVBUM2776/D
MAIN BOARD LAYOUT
Figure 4. Main Board Top Layer
Figure 5. Main Board Inner Layer 1
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EVBUM2776/D
Figure 6. Main Board Inner Layer 2
Figure 7. Main Board Bottom Layer
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EVBUM2776/D
DAUGHTER BOARD LAYOUT
Figure 8. Daughter Card Top Layer
Figure 9. Daughter Card Inner Layer 1
Figure 10. Daughter Card Inner Layer 2
Figure 11. Daughter Card Bottom Layer
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EVBUM2776/D
MAIN BOARD SCHEMATIC
Figure 12. Main Board Schematic
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DAUGHTER BOARD SCHEMATIC
Figure 13. Daughter Card Schematic
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EVBUM2776/D
MAGNETIC DESIGN
Figure 14. Transformer Design (Core: Hitachi ML29D)
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Evaluation Board Efficiency Data
Efficiency (%)
15 V Output Efficiency vs. Load
V
V
V
100%
95%
90%
85%
EVBUM2776/D
20 V Output Efficiency vs. Load
Efficiency (%)
100%
80%
75%
70%
65%
60%
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25
Output Current (A)
Figure 15. 20 V Efficiency Plot
95%
90%
85%
37 V
48 V
57 V
80%
75%
70%
65%
60%
0 0.5 1 1.5 2 2.5 3
Output Current (A)
Figure 16. 15 V Efficiency Plot
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9
37
48
57
100%
95%
90%
85%
EVBUM2776/D
12 V Output Efficiency vs. Load
Efficiency (%)
100%
80%
75%
70%
65%
60%
0 0.5 1 1.5 2 2.5 3
Output Current (A)
Figure 17. 12 V Efficiency Plot
9 V Output Efficiency vs. Load
95%
90%
85%
37 V
48 V
57 V
Efficiency (%)
80%
75%
70%
65%
60%
0 0.5 1 1.5 2 2.5 3
Output Current (A)
Figure 18. 9 V Efficiency Plot
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37 V
48 V
57 V
100%
95%
90%
85%
EVBUM2776/D
5 V Output Efficiency vs. Load
Efficiency (%)
80%
75%
70%
65%
60%
0 0.5 1 1.5 2 2.5 3
Output Current (A)
Figure 19. 5 V Efficiency Plot
OUTPUT RIPPLE
37 V
48 V
57 V
Figure 20. 37 Vin 5 Vout Output Ripple
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