... typeBipolarIntegrationMedium scopeOperating temperature-40~125(°C)3. PT1101 IS PWM/VFM Step-Down DC/DC Controller 4. GENERAL DESCRIPTION: The ... a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, an oscillator, an error amplifier with internal ... performance while maintaining stability. For example, with its PWM/VFM alternative circuit, when the load current is small, the ...