UC3843B Current Mode PWM Controller IC – SMPS Control | STMicroelectronics

MPN:UC3843B

The UC3843B is a current-mode PWM controller IC from STMicroelectronics, designed for high-efficiency switch-mode power supplies (SMPS). It provides precise duty-cycle control, fast dynamic response, and excellent line and load regulation, making it ideal for flyback, forward, and DC-DC converter designs.

With built-in features such as under-voltage lockout (UVLO), low start-up current, and cycle-by-cycle current limiting, the UC3843B ensures safe, stable, and reliable power control in both consumer and industrial power systems.