This document describes the features and characteristics of the SLUS431A product, including secondary-side PWM control, isolated PWM command through a pulse transformer, initial free-running soft-startup, up to 400kHz synchronizable switching frequency, high-current FET drive, multi-mode overcurrent protection, programmable volt-second clamp, undervoltage lockout, low-current startup, and programmable overvoltage and undervoltage protection.
The UCC2961 is an advanced primary‑side startup controller designed for isolated switch‑mode power converters. It offers secondary‑side PWM control, high‑current FET drive (1.5 A sink, 0.75 A source), programmable over‑/undervoltage protection, and a synchronizable free‑running oscillator up to 400 kHz.
The datasheet details absolute‑maximum ratings, electrical characteristics such as input voltage range, reference voltage, and oscillator frequency, as well as pin descriptions and package options. It also includes mechanical dimensions for tape‑and‑reel packaging and TI’s standard warranty and safety notices.
| Reference voltage (REF pin) | 5.0 V |
|---|---|
| High‑current FET drive capability | 1.5 A sink, 0.75 A source |
The REF pin supplies a 5‑V reference output.
The OUT pin can sink 1.5 A and source 0.75 A for the MOSFET gate drive.