Texas Instruments UCC28782EVM-030, User Manual

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1 Using the UCC28782EVM-030 65-W USB-C PD High-Density Active-Clamp Flyback
Converter
Table of Contents
1 Using the UCC28782EVM-030 65-W USB-C PD High-Density Active-Clamp Flyback Converter .................................... 2
2 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines ............................................ 3
3 Description .............................................................................................................................................................................. 4
4 Electrical Performance Specifications ................................................................................................................................. 6
5 Schematic Diagram ................................................................................................................................................................ 7
6 Description .............................................................................................................................................................................. 9
6.1 Typical Application............................................................................................................................................................. 9
6.2 Using the EVM on a Load with USB-C PD Communication............................................................................................... 9
6.3 Using the EVM on a Load without USB-C PD Communication.......................................................................................... 9
7 Test Setup .............................................................................................................................................................................. 10
7.1 Test Setup Requirements................................................................................................................................................. 10
7.2 Test Setup Diagram.......................................................................................................................................................... 11
7.3 Test Points........................................................................................................................................................................ 11
8 Performance Data and Typical Characteristic Curves ...................................................................................................... 12
8.1 Efficiency Result of 4-Point Average on 20-Vout.............................................................................................................. 12
8.2 Efficiency Result of 4-Point Average at 15-Vout............................................................................................................... 13
8.3 Efficiency Result of 4-Point Average at 9-Vout................................................................................................................. 14
8.4 Efficiency Result of 4-Point Average at 5-Vout................................................................................................................. 15
8.5 Efficiency Typical Results................................................................................................................................................. 16
8.6 Output Characteristics...................................................................................................................................................... 16
8.7 Switching Frequency........................................................................................................................................................ 17
8.8 Key Switching Waveforms and Operation Mode Load Current........................................................................................ 17
8.9 Start Up............................................................................................................................................................................ 18
8.10 Output Voltage Adjustment by USB-C PD..................................................................................................................... 19
8.11 Line Transient Response................................................................................................................................................ 19
8.12 Output Ripple Voltage.................................................................................................................................................... 19
8.13 Boost Function for VDD Bias......................................................................................................................................... 21
8.14 X-Capacitor Discharge................................................................................................................................................... 21
8.15 USB-C PD Over Current Limit........................................................................................................................................ 21
8.16 Load Transient Response.............................................................................................................................................. 22
8.17 EN55022 Class B Conducted EMI Test Result.............................................................................................................. 23
8.18 Thermal Images at Full Load (20V and 3.25 A)............................................................................................................. 25
9 Transformer Details .............................................................................................................................................................. 27
10 EVM Assembly and Layout ................................................................................................................................................ 28
11 List of Materials ................................................................................................................................................................... 30
12 Revision History ................................................................................................................................................................. 32
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2 Using the UCC28782EVM-030 65-W USB-C PD High-Density Active-Clamp
Flyback Converter SLUUBZ3B – MAY 2020 – REVISED AUGUST 2020
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