NCP1351 Variable Off Time PWM

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上傳日期: 2010-04-13

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標簽:NCP1351(2)PW(15)

NCP1351 pdf,detasheet

Variable Off TIme PWM Controller

The NCP1351 is a current-mode controller targeTIng low power
off-line flyback Switched Mode Power Supplies (SMPS) where cost
is of utmost importance. Based on a fixed peak current technique
(quasi-fixed TON), the controller decreases its switching frequency as
the load becomes lighter. As a result, a power supply using the
NCP1351 naturally offers excellent no-load power consumpTIon,
while opTImizing the efficiency in other loading conditions. When the
frequency decreases, the peak current is gradually reduced down to
approximately 30% of the maximum peak current to prevent
transformer mechanical resonance.

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