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AND8242D 19 V 30 A Universal Input ACDC Adaptor Using NCP1271 Prepared by Jon Kraft and Kahou Wong ON Semiconductor INTRODUCTION PWM switching The NCP1271 is one of the latest fixedfrequency currentmode controllers with 1 adjustable SoftSkipt standby operation for lowlevel audible noise 2 integrated highvoltage startup for saving standby power 3 timer based overload fault detection and 4 internal latch protection features Table 1 summarizes all the features of an NCP1271 based power supply ......
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