P1012AP13 datasheet(12/25 Pages) ONSEMI

tên linh kiện	P1012AP13

Giải thích chi tiết về linh kiện	Self-Supplied Monolithic Switcher for Low Standby- Power Offline SMPS

PDF	25 Pages

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nhà sản xuất	ONSEMI [ON Semiconductor]

Trang chủ	http://www.onsemi.com

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NCP1010, NCP1011, NCP1012, NCP1013, NCP1014

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Figure 20. A more detailed view of the NCP101X offers better insight on how to

properly wire an auxiliary winding.

Startup Source

Drain

−

VCCON = 8.5 V

VCCOFF = 7.5 V

VCC

Rlimit

I > 7.4m

(Typ.)

CVcc

Caux

Laux

Ground

Vclamp = 8.7 V typ.

Permanent

Latch

Figure 21. The burst frequency becomes so low that it is difficult to keep

an adequate level on the auxiliary VCC . . .

u30 ms

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 22 pictures the peak current evolution of the

NCP101X entering standby.

P1012AP13 bảng dữ liệu(PDF) 12 Page - ON Semiconductor