STMicroelectronics, Inc. DC DC Switching Controllers E-UC3843BD1

The E-UC3843BD1 is a high-performance current mode PWM controller designed for off-line or DC to DC fixed frequency control applications. It features a trimmed oscillator that guarantees a frequency of 250 kHz, with the capability to operate up to 500 kHz. The controller includes automatic feed-forward compensation, cycle-by-cycle current limiting through a latching PWM mechanism, and an internally trimmed reference with undervoltage lockout. This controller is suitable for driving N-channel MOSFETs with a high current totem pole output stage, capable of sourcing or sinking up to 1 A. The device operates with low start-up and operating currents, making it efficient for various applications. The E-UC3843BD1 has specific under-voltage lockout thresholds of 8.5 V (on) and 7.9 V (off), allowing for operation with duty cycles approaching 100%. Engineers considering this product should note its minimal external parts count and robust performance characteristics, which make it a viable option for implementing efficient DC-DC conversion solutions.