The MC33363A 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/1.5 A MOSFET power switch, 500 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, output overvoltage protection, and thermal shutdown.

• Enhanced Power Capability Over MC33363
• On-Chip 700 V, 1.5 A MOSFET Power Switch
• Rectified 240 Vac Line Source Operation
• On-Chip 500 V Active Off-Line Startup FET
• Latching PWM for Double Pulse Suppression
• Cycle-By-Cycle Current Limiting
• Input Undervoltage Lockout with Hysteresis
• Output Overvoltage Protection Comparator
• Trimmed Internal Bandgap Reference
• Internal Thermal Shutdown