DAK-91【PDF 2/35 页】DESIGN ACCELERATOR KIT III SWTCH

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RDR-91 12 V, 1 A, Universal Input Supply

Table of Contents

11-Feb-13

1 ?

2 ?

3 ?

4 ?

Introduction ................................................................................................................. 4 ?

Power Supply Specification ........................................................................................ 5 ?

Circuit Diagram ........................................................................................................... 6 ?

Circuit Description ...................................................................................................... 7 ?

4.1 ?

4.2 ?

4.3 ?

4.4 ?

4.5 ?

4.6 ?

4.7 ?

4.8 ?

Input Rectification and Filtering ........................................................................... 7 ?

TNY278PG Operation ......................................................................................... 7 ?

Output Rectification and Filtering ........................................................................ 8 ?

Feedback and Output Voltage Regulation ........................................................... 8 ?

Output Overvoltage Shutdown ............................................................................ 8 ?

EMI Design Aspects ............................................................................................ 8 ?

Peak Primary Current Limit Selection .................................................................. 9 ?

Undervoltage Lockout ......................................................................................... 9 ?

5 ?

6 ?

7 ?

PCB Layout .............................................................................................................. 10 ?

Bill of Materials ......................................................................................................... 11 ?

Transformer Specification ......................................................................................... 12 ?

7.1 ?

7.2 ?

7.3 ?

7.4 ?

7.5 ?

Electrical Diagram ............................................................................................. 12 ?

Electrical Specifications ..................................................................................... 12 ?

Materials ............................................................................................................ 12 ?

Transformer Build Diagram ............................................................................... 13 ?

Transformer Construction .................................................................................. 13 ?

8 ?

9 ?

Transformer Design Spreadsheet............................................................................. 14 ?

Performance Data .................................................................................................... 16 ?

9.1 ?

9.2 ?

9.3 ?

9.4 ?

9.5 ?

9.6 ?

Efficiency ........................................................................................................... 16 ?

Active Mode CEC Measurement Data ............................................................... 17 ?

No-load Input Power (R8 not installed: no bias winding supplementation) ........ 18 ?

No-load Input Power (with R8 and bias winding supplementation).................... 19 ?

Available Standby Output Power ....................................................................... 20 ?

Regulation ......................................................................................................... 21 ?

9.6.1 ?

Load and Line ............................................................................................ 21 ?

10 ?

11 ?

Thermal Performance ........................................................................................... 22 ?

Waveforms ............................................................................................................ 23 ?

11.1 ? Drain Voltage and Current, Normal Operation................................................... 23 ?

11.2 ? Output Voltage Start-Up Profile ......................................................................... 24 ?

11.3 ? Drain Voltage and Current Start-Up Profile ....................................................... 24 ?

11.4 ? Load Transient Response (75% to 100% Load Step) ....................................... 25 ?

11.5 ? Output Ripple Measurements ............................................................................ 26 ?

11.5.1 ?

11.5.2 ?

Ripple Measurement Technique ................................................................ 26 ?

Measurement Results ................................................................................ 27 ?

11.6 ? Overvoltage Shutdown ...................................................................................... 27 ?

12 ?

13 ?

Line Surge............................................................................................................. 28 ?

Conducted EMI ..................................................................................................... 29 ?

13.1 ? 115 VAC, Full Load ........................................................................................... 29 ?

13.2 ? 230 VAC, Full Load ........................................................................................... 30 ?

14 ?

Audible Noise ........................................................................................................ 31 ?

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

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