The UC1875/6/7/8 family of integrated circuits implements phase‑shift control of a bridge power stage, providing constant‑frequency PWM, zero‑voltage switching and configurable voltage or current mode operation. Features include programmable turn‑on delay, four 2 A totem‑pole outputs, undervoltage lockout, soft‑start and latchable over‑current protection.
Electrical characteristics cover supply voltage up to 20 V, output current up to 0.5 A, operating temperature ranges from –55 °C to 125 °C (UC1875 series) and detailed pin functions such as CLOCKSYNC for clock synchronization, CS+ for current‑fault detection, and RAMP for slope compensation. Packages are offered in 20‑pin DIP, 28‑pin SOIC, PLCC and ceramic variants.
| Undervoltage Lockout Start Threshold (UC1875) | 10.75 V |
|---|---|
| Operating Temperature Range (UC1875 series) | -55 °C to 125 °C |
| Number of Output Drivers | Four 2 A totem‑pole outputs |
The oscillator can operate above 2 MHz, making overall switching frequencies up to 1 MHz practical.
Each device provides four 2 A totem‑pole outputs (A‑B and C‑D pairs).
The CLOCKSYNC pin provides bi‑directional clock and synchronization functions.
The UVLO start threshold for UC1875 is 10.75 V.