TEST Report

30W Active-Clamp-Flyback(ACF) ith Gan FETs reference design

for a high power density AC/DC Wall Charger

Description 30W Charger uses the UCC28780 active clamp flyback controller to generate a

15V/12V/9V/5V adjustable output voltage. The maximum power rating is 30W at 15V

output, and up to 3A at 5V/9V output voltage settings. This design reaches a peak

efficiency of over 92% using GaN MOSFETs. The average efficiency and standby

power levels are designed to meet DoE level VI limits. Board dimensions are 1.34” x

1.41” x 0.708 (34mm x 36mm x 18mm).

1 Test Prerequisites 1.1 Voltage and Current Requirements

Line Input Voltage Range : 90Vac~265Vac

Line Input Frequency : 47Hz~63Hz

DC Output Voltage/Current : 15V/2A, 12V/2.5A, 9V/3A, 5V/3A

1.2 Required Equipment

AC voltage source : Chroma 61601

AC power meter : YOKOGAWA WT210

Electronic load : Chroma 63102

Multi-meters : Agilent 34401A

Oscilloscope : Tektronix MSO 4104B

2. Input & Output Characteristics 2.1 Efficiency Data VS Output

(Note: The efficiency is measured from PCB END.)

2.2 Input Power No Load

2.3 Start-up Time

2.4 Brown-in and Brown-out

2.5 Hold up time

3. Output Characteristics

3.1 Output Ripple Voltage

3.2 Load Transient

3. 3 Loop Gain

115Vac/60Hz

15V/2A

12V/2.5A

9V/3A

5V/3A

230Vac

15V/2A

12V/2.5A

9V/3A

5V/3A