UC3845BN ST DC-DC Controllers

The UC3845BN 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) . For selection, verify maximum duty cycle of 48% (limited by internal toggle flip-flop), 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 0°C to +70°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. In stock at HL Electronics – request a quote for fast delivery.