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