BenQ MP611 - Transformer and Snubber Circuit of Sub Power Board

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14. SYNC: oscillator synchronization input(input of synchronization signal)
15. CT: oscillator timing capacitor and resistor(to set oscillation frequency )
16. IDET: Non-inverting input to current error amplifier( input of inductor current signal)
5.6 Transformer and snubber circuit of Sub Power Board
1206
8
1
2
10
9
7
6
1206
C663
T651
D652
C651
R651
D662
C652D651
25V
1U
US1M
0.01U
1KV
(D)
2
W
39K
ES1D
630V
0.01U
P6KE200A
380V
To IC651 pin 7(Drain)
TO D703
In a flyback converter operated in the discontinuous mode, the energy stored in the flyback
transformer must be zero at the beginning and end of each switching period . During the on-time
energy is stored in the transformer and energy taken from the transformer when the switching transistor turn-off, the
stored energy is all delivered to the output .The flyback transformer is T651,
IC651 is the power module IC, it include PWM IC and MOSFET . R651,C651,D651, D652 are the snubber
circuit, which is reduce the spike voltage.