P1014AP 데이터 시트보기 (PDF) - ON Semiconductor

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P1014AP

Self-Supplied Monolithic Switcher for Low Standby Power Offline SMPS

ON Semiconductor 

NCP1010, NCP1011, NCP1012, NCP1013, NCP1014

VCCON = 8.5 V

VCCOFF = 7.5 V

-

+

+

Drain

Startup Source

VCC

Rlimit

D1

+

−

+

Vclamp = 8.7 V typ.

Permanent

Latch

+

-

+

+

CVcc

+

Caux

I > 7.4m

(Typ.)

Ground

Laux

Figure 18. A more detailed view of the NCP101X offers better insight on how to

properly wire an auxiliary winding.

u30 ms

Figure 19. The burst frequency becomes so low that it is difficult to keep

an adequate level on the auxiliary VCC . . .

Lowering the Standby Power with Skip−Cycle

Skip−cycle offers an efficient way to reduce the standby

power by skipping unwanted cycles at light loads.

However, the recurrent frequency in skip often enters the

audible range and a high peak current obviously generates

acoustic noise in the transformer. The noise takes its origins

in the resonance of the transformer mechanical structure

which is excited by the skipping pulses. A possible

solution, successfully implemented in the NCP1200 series,

also authorizes skip−cycle but only when the power

demand has dropped below a given level. At this time, the

peak current is reduced and no noise can be heard.

Figure 20 pictures the peak current evolution of the

NCP101X entering standby.

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