This datasheet provides details about the UC1841 UC2841 UC3841 PWM controllers, including control, driving, monitoring and protection functions.
The UC1841 family of programmable off‑line PWM controllers from Unitrode is designed for versatile DC‑DC converter topologies, offering low‑current start, feed‑forward voltage regulation, and both voltage‑ and current‑mode operation. The devices include built‑in protection features such as over‑voltage, under‑voltage, and over‑current fault handling with latch‑off or automatic restart.
The datasheet lists absolute maximum ratings, electrical characteristics, functional block diagrams, and example application circuits for flyback and buck regulators. Detailed pin‑outs for DIL‑18, SOIC‑18, PLCC‑20 and LCC‑20 packages are provided, along with typical performance graphs and design equations.
| PWM Output Current (steady‑state) | 400 mA |
|---|---|
| Operating Temperature (UC1841) | -55 °C to +125 °C |
The devices provide built‑in protection against over‑voltage, under‑voltage, and over‑current faults, with options for latch‑off or automatic restart.