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The fundamentalchallenge of power supply design is to simultaneously realize two conflicting objectives: good electrical performanceand low cost. TheUC3842 is an integrated pulse width modulator (PWM) designedwith both theseobjectives inmind.This IC provides designersan inexpensive controllerwith which they can obtain all the performance advantages of current-mode operation. In addition,theUC3842 is optimized for efficient power sequencingof off-line converters and for driving increasingly popularPOWERMOS.
