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NCP1072

High-Voltage Switcher for Low Power Offline SMPS

ON Semiconductor 

NCP1070, NCP1071, NCP1072, NCP1075, NCP1076, NCP1077

almost impossible exercise since many parameters are

involved, including the converter time constants. Fine

tuning of Rlimit thus requires a few iterations and

experiments on a breadboard to check the auxiliary voltage

variations but also the output voltage excursion in fault.

Once properly adjusted, the fail−safe protection will

preclude any lethal voltage runaways in case a problem

would occur in the feedback loop.

Figure 28. The Burst Frequency Becomes so Low That it is Difficult to Keep an Adequate Level on the Auxiliary

VCC...

Figure 29 describes the main signal variations when the

part operates in auto−recovery OVP:

Figure 29. If the VCC Current Exceeds a Certain Threshold, an Auto−Recovery Protection is Activated

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