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SMPS AC/DC Reference Design User’s Guide
DS70320B-page 66 © 2008 Microchip Technology Inc.
The LED flashes the same number of times as the fault ID of the source that caused
the fault. The source of the fault can be decoded using the values in Table 3-6 and
Table 3- 7.
TABLE 3-6: FAULT SOURCE INDICATION ON PRIMARY SIDE
TABLE 3-7: FAULT SOURCE INDICATION ON SECONDARY SIDE
Fault ID Source of Fault
1 PCB overtemperature
2 PFC output overvoltage
3 ZVT overcurrent
4 AC overvoltage
5 AC undervoltage
6 Secondary UART failure
7 System overload
Fault ID Source of Fault
1 12V Buck overvoltage
2 12V Buck undervoltage
3 Multi-phase overcurrent
4 PCB overtemperature
5 Single-phase overcurrent
- SMPS AC/DC Reference Design 1
- User’s Guide 1
- Table of Contents 3
- Appendix B. Test Results 4
- DOCUMENTATION CONVENTIONS 7
- WARRANTY REGISTRATION 8
- RECOMMENDED READING 8
- THE MICROCHIP WEB SITE 8
- CUSTOMER SUPPORT 9
- DOCUMENT REVISION HISTORY 9
- SMPS AC/DC REFERENCE 11
- DESIGN USER’S GUIDE 11
- Chapter 1. Introduction 11
- 1.2 BLOCK DIAGRAM 12
- Introduction 13
- HV Bias Supply 24
- CONVERTERS 28
- Chapter 2. Hardware Design 29
- 2.1.1 Power-Train Design 30
- Hardware Design 31
- 2.2 FULL-BRIDGE ZVT CONVERTER 34
- 41.592.74 38
- Chapter 3. Software Design 55
- Software Design 57
- 3.5.1 Output Sequencing 68
- Table 3- 7 70
- Chapter 4. System Operation 71
- System Operation 73
- 4.1.4 System Connections 74
- 4.2 SYSTEM OPERATION 76
- Board Layouts and Schematics 81
- Test Results 101
- AC and 220 VAC 106
- AC WITH 106
- B.8 TEST RESULTS TABLE 108
- Appendix C. References 113
- Worldwide Sales and Service 118
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