OVP TSD Cycle-by-cycle current limiting, under-voltage lockout with hyster- esis, over-voltage protection, and thermal shutdown protects the power supply during the normal overload and fault conditions. Over-voltage protection and thermal shutdown are latched after a short delay. The latch may be reset by cycling the input supply. Low-current startup and a low-power standby mode selected from the secondary circuit completes a comprehensive suite of features.
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STRF6654 Sanken Electric Co., Ltd., STRF6654 Datasheet
Regulation is achieved as in fixed off-time mode but instead of having a fixed off-time, the demagnetization of the transformer is sensed by a second comparator. This comparator threshold, Vth 2 is nominally 1. Quasiresonance sensing makes use of the natural magnetizing and leakage inductances and self-capacitances of the power circuit. Once the current in the output diode stops flowing, the primary stored energy rings as shown by VP and VDS.
¿Cómo comprobar el funcionamiento del STR F6654?