User`s guide

SMPS AC/DC Reference Design User’s Guide
DS70320B-page 88 © 2008 Microchip Technology Inc.
FIGURE A-14: PRIMARY SIDE HARDWARE FAULT CIRCUITRY SCHEMATIC
R92 47K R3 10K
220pF
C39
220pF
C37
R106
1M
R80
1M
R83
1M
4K7
R87
R76
4K7
R18
470R
R16
470R
100pF
C44
R117
100K 100KR129
R2
DNP
R94
47K R7 100K
220pF
C36
220pF
C5
4K7
R82
4K7
R28
R17
470R
R14
470R
R15
470R
R121
4K7
0R
R97
3.3K
R13
220pF
C6
R19
470R
R90
10K
R32
10K
R31
1M
Under-Voltage AC
Over-Voltage AC
R4
4K7
R130 4K7
4K7
R190
R89
100K
R86
10K
R93
47K
R25
10K
R29
4K7
R30
1M
R122
1M
R91
47K
R188 4.7K
R85
10K
R84
10K
R88
10K
R33
10K
R95
10K
R81
10K
R36
10K