onsemi AC DC Converters, Offline Switches MC33364D

The MC33364D is a variable frequency SMPS controller designed for critical conduction mode operation, optimized for high-density power supplies. It features an integrated high-voltage startup that reduces power dissipation by approximately 0.7 W compared to traditional resistor bootstrapped circuits. Key functionalities include an on-board reference, under-voltage lockout (UVLO), a watchdog timer for output switching initiation, a zero current detector for maintaining critical conduction, and cycle-by-cycle current limiting. The MC33364D incorporates a frequency clamp set at 126 kHz, which can be adjusted by connecting external resistors. It operates within a temperature range of -25°C to +125°C and includes over-temperature protection and shutdown capabilities. The device is available in a Pb-free and halide-free package, making it suitable for environmentally conscious applications. The MC33364D is packaged in an SO-8 configuration, facilitating compact designs.