PWM ICPulse Width Modulator Integrated Circuit
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Many integrated AC/DC PWM ICs include a 700 V-rated power switch since designers must take special care and perform worst-case analysis when designing power supplies for electric motor-based appliances.
By adjusting the duty cycle ratio of PWM IC (adjusting the resistance and capacitance), different output pulse with the same amplitude and variable width could be obtained.
Recently Richtek has been shifting away from its notebook and motherboard divisions and into PWM ICs for telecommunication and consumer applications.
As for PWM ICs, very few have a switching frequency reduction function, meaning that the engineer must design a discrete circuit around the IC.
Most PWM ICs sense switch current so that a switching cycle can be terminated if the current through the device becomes excessive.