High Voltage Switching Regulator

The MC33365 is a monolithic high voltage switching regulator that is specifically designed to operate from a rectified 240 Vac line source. This integrated circuit features an on?chip 700 V/1.0 A SENSEFET power switch, 450 V active off?line startup FET, duty cycle controlled oscillator, current limiting comparator with a programmable threshold and leading edge blanking, latching pulse width modulator for double pulse suppression, high gain error amplifier, and a trimmed internal bandgap reference. Protective features include cycle?by?cycle current limiting, input undervoltage lockout with hysteresis, bulk capacitor voltage sensing, and thermal shutdown. This device is available in a 16?lead dual?in?line package.

? On?Chip 700 V, 1.0 A SENSEFET Power Switch

? Rectified 240 Vac Line Source Operation

? On?Chip 450 V Active Off?Line Startup FET

? Latching PWM for Double Pulse Suppression

? Cycle?By?Cycle Current Limiting

? Input Undervoltage Lockout with Hysteresis

? Bulk Capacitor Voltage Comparator

? Trimmed Internal Bandgap Reference

? Internal Thermal Shutdown