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Can you please let me know the working of 1845 PWM controllor which was with UNITRODE now its with TI

Other Parts Discussed in Thread: UC2845

The datasheet gives very little information about the working of the 1845 PWM IC ... I specifically want to know how the COMP pin has effect on the output of the IC what is the voltage range on the comp pin4774.uc2845.pdf which causes thr PWM to shift between low to high