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NCP1351 Variable Off Time PWM

消耗积分:10 | 格式:rar | 大小:526 | 2010-04-13

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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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