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NCP1351 Variable Off Time PWM

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  • 标      签: NCP1351 PW

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NCP1351 pdf,detasheet Variable Off TIme PWM Controller The NCP1351 is a current-mode controller targeTIng low poweroff-line flyback Switched Mode Power Supplies (SMPS) where costis of utmost importance. Based on a fixed peak current technique(quasi-fixed TON), the controller decreases its switching frequency asthe load becomes lighter. As a result, a power supply using theNCP1351 naturally offers excellent no-load power consumpTIon,while opTImizing the efficiency in other loading conditions. When thefrequency decreases, the peak current is gradually reduced down toapproximately 30% of the maximum peak current to preventtransformer mechanical resonance.
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