NCP1336 데이터 시트보기 (PDF) - ON Semiconductor

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NCP1336

Quasi-Resonant Current Mode Controller for High Power Universal Off-Line Supplies

ON Semiconductor 

NCP1336A/B

Time Out

In case of extremely damped free oscillations, the ZCD

comparator can be unable to detect the valleys.

Consequently, the decimal counter clock is in low state and

the drive pulses stops. To avoid such situation, NCP1336

integrates a Time Out function that acts as a clock for the

decimal counter. The controller thus continues its normal

operation. To avoid having a too big step in frequency, the

time out duration is set to 5.25 ms. Figures 15 and 16 detail

the time out operation.

ZCD

Laux

10 V

ESD

+

Vth

DRV

+

-

Leakage

Blanking

3 ms Pulse

demag

1234

Decimal Counter

clk

rst

Vdd

5 ms

Timeout

+

+-

100 ns

Figure 14. Time Out Circuit

http://onsemi.com

16

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