NCP1027P100G(2015) Просмотр технического описания (PDF) - ON Semiconductor

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NCP1027P100G
(Rev.:2015)

High-Voltage Switcher for Medium Power Offline SMPS Featuring Low Standby Power

ON Semiconductor 

NCP1027

In Figure 27, one can see that the VCC is still alive,

testifying for a badly coupled power secondary and

primary auxiliary windings. Some situations exist where an

output short−circuit make the auxiliary winding collapse

before the timer completion. In this particular case, the

Undervoltage Lock Out (UVLO) circuitry has the priority

and safely cuts off all driving pulses. Figure 28 describes

this variation.

Figure 28. The auxiliary winding collapses in presence of a short−circuit. Pulses are immediately stopped

as VCC crosses the minimum operating voltage, VCC(min).

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