DATA SHEET www.
onsemi.
com PWM Current-Mode Controller for Free Running Quasi-Resonant Operation NCP1338 The NCP1338 combines a true current mode modulator and a demagnetization detector which ensures full Borderline/Critical Conduction Mode in any load/line conditions together with minimum drain voltage switching (Quasi−Resonant operation).
The transformer core reset detection is done internally, without using any external signal, due to the Soxyless concept.
The frequency is internally limited to 130 kHz, preventing the controller from operating above the 150 kHz CISPR−22 EMI starting limit.
By monitoring the feedback pin activity, the controller enters skip mode as soon as the power deman...

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