UC2843BN ST DC-DC Controllers

The UC2843BN is a high-performance fixed frequency current-mode PWM controller from STMicroelectronics in DIP-8 through-hole package, designed for DC-DC converter applications with UVLO thresholds of 8.5V (turn-on) and 7.9V (turn-off) and maximum duty cycle approaching 100%. For selection, verify trimmed oscillator for precise frequency control up to 500kHz, high-current totem pole output (1A peak) for driving MOSFETs, low start-up current (<0.5mA), current limiting with cycle-by-cycle control, and operating temperature from -40°C to +85°C. Features include automatic feed-forward compensation, pulse-by-pulse current limiting, internally trimmed bandgap reference, and UVLO with hysteresis. Ideal for DC-DC converters (buck, boost, flyback, forward), battery-powered equipment, automotive DC-DC converters, LED drivers, and any low-to-mid power conversion requiring <50% duty cycle with 8.5V UVLO threshold for primary side regulation. In stock at HL Electronics – request a quote for fast delivery.