UCC3583 is a synchronizable secondary side post regulator for precision regulation of the auxiliary outputs of multiple output power supplies. It contains a leading edge pulse width modulator, which generates the gate drive signal for a FET power switch connected in series with the rectifying diode. The turn-on of the power switch is delayed from the leading edge of the secondary power pulse to regulate the output voltage.
The UCC1583, UCC2583, and UCC3583 are synchronizable secondary‑side post regulators designed for precise regulation of auxiliary outputs in multi‑output power supplies. They provide leading‑edge modulation, high‑frequency operation (>500 kHz), and a high‑current gate driver (0.5 A sink/1.5 A source). The devices include built‑in UVLO, soft‑start, and programmable current limiting.
The datasheet details absolute maximum ratings, thermal impedance, pin descriptions, electrical characteristics, typical application circuits, and mechanical dimensions for the 14‑pin and 20‑pin packages. It also contains an important notice about TI’s warranty and product liability.
| Gate Driver Current Capability | 0.5 A sink / 1.5 A source |
|---|---|
| Supply Clamp Voltage | 13 V – 15 V |
| UVLO On‑Threshold Voltage | 8.5 V – 9.5 V |
The gate driver can sink 0.5 A and source 1.5 A.
The UVLO turns on at about 8.5 V–9.0 V and turns off at about 7.9 V–8.4 V.