Regulating pulse width modulator sg3525an st sg3525an the b sg3525an b from b st b is a regulating pulse width modulator that has been designed to offer improved performance and lower external parts count when being used in the design of all types of switching power supplies the on chip reference is trimmed to plusmn 1 and the input common mode range of the error amplifier includes the reference voltage eliminating the need for external resistors a sync input to the oscillator allo