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2022-09-24 23:33:15
MC33368 - High Voltage GreenLine Power Factor Controller
The MC33368's active power factor controller is used as a feature to improve preconverter in off-line power supply applications. The MC33368 is optimized for low power consumption, requiring a high density power supply with minimal board area, reduced component count and low power dissipation. Narrow body SOIC packages offer a small footprint. The integrated high voltage startup saves about 0.7 W of power compared to the resistive bootstrap circuit. The MC33368 features a watchdog timer to initiate output switching that forces the line current to follow a quadrant multiplier instantaneous line voltage , an under-voltage lockout (UVLO) circuit monitors the VCC supply voltage and drives a CMOS driver for the MOSFET. The MC33368 also includes a programmable output switching frequency clamp. Protection features include an output overvoltage comparator to minimize overshoot, a restart delay timer and cycle-by-cycle current limit.
• Lossless Shutdown Startup • Output Overvoltage Comparator • Leading Edge Blanking (LEB) Immunity • Watchdog Timer Start Switch • Restart Delay Timer