Texas Instruments High-Performance Analog AC DC Converters, Offline Switches UCC2804D/81221

The UCC2804D/81221 is a low-power BiCMOS current-mode PWM controller designed for offline and DC-to-DC fixed frequency switching power supplies. It features a typical starting supply current of 100¬µA and an operating supply current of 500¬µA, allowing for efficient power management. The device operates at frequencies up to 1MHz and includes internal soft start and fault soft start capabilities, enhancing system reliability during startup and fault conditions. This controller incorporates internal leading-edge blanking for the current sense signal, which helps to improve performance by reducing noise sensitivity. It provides a 1 Amp totem-pole output with a typical response time of 70ns from the current sense to the gate drive output. The UCC2804D/81221 also features a 1.5% tolerance voltage reference, making it suitable for applications requiring precise voltage regulation. The part is available in an 8-pin SOIC package and is specified for operation within a temperature range of -40¬8C to +85¬8C. Its pin configuration is compatible with the UC3842 and UC3842A families, facilitating easy integration into existing designs. The UCC2804D/81221 is a suitable choice for engineers looking for a reliable and efficient PWM controller for their power supply designs.