Rochester Electronics PMIC - Voltage Regulators - DC DC Switching Controllers UC3845D

The UC3845D is a current-mode pulse-width modulation (PWM) controller optimized for off-line and DC-DC converter applications. It features a low start-up current of less than 1mA, automatic feedforward compensation, and pulse-by-pulse current limiting, making it suitable for a variety of power supply designs. The device operates within a temperature range of 0¬8C to 70¬8C and supports a maximum switching frequency of up to 500kHz. The UC3845D includes an undervoltage lockout (UVLO) with hysteresis, enhanced load-response characteristics, and a high-current totem-pole output stage designed for driving N-channel MOSFETs. It is available in a 14-pin SOIC package, which facilitates integration into compact designs. This controller is particularly effective for applications requiring reliable switching regulation and can be used in transformer-coupled DC-DC converters.