UNITRODE UCC3581 Manuals

UCC3581 is a voltage mode pulse width modulator designed to control low power isolated DC-DC converters, primarily used for single switch forward and flyback converters. It features BiCMOS circuitry for low startup and operating current, while being able to drive power MOSFETs at frequencies up to 100kHz. The UCC3581 oscillator allows programming of both the frequency and the maximum duty cycle with two resistors and a capacitor. It includes programmable soft start circuitry, overcurrent detection, a 7.5V linear preregulator for controlling chip VDD during startup, and an on-board 4.0V logic supply. The UCC3581 provides functions to maximize light load efficiency that are not normally found in PWM controllers.

The UCC3581 is a low-power voltage mode pulse width modulator designed to control low-power isolated DC-DC converters. It features low startup and operating current, and can drive power MOSFETs at frequencies up to 100kHz. The device includes programmable soft start circuitry, overcurrent detection, and a linear preregulator, making it suitable for single switch forward and flyback converters.