UC3843BD1013TR ST AC-DC Controllers

The UC3843BD1013TR is a fixed frequency current-mode PWM controller from STMicroelectronics, operating from 7.6V to 30V supply with UVLO thresholds of 8.5V (turn-on) and 7.6V (turn-off), making it ideal for DC-DC converter applications rather than off-line systems. For selection, verify the maximum duty cycle approaching 100% (compared to UC3845's 50% limit), 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 -25°C to +85°C. Applications include non-isolated DC-DC converters (buck, boost, flyback, forward), battery-powered equipment, automotive DC-DC converters, LED drivers, industrial power supplies, and any low-to-mid power conversion where the input voltage is 8.5V to 30V and wide duty cycle range is required. In stock at HL Electronics – request a quote for fast delivery.