POWER INTEGRATIONS SC1117DG-TL

SC1117DG incorporates a 700 V power MOSFET, oscillator, simple ON/OFF control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit and thermal shutdown circuitry onto a monolithic IC. The startup and operating power are derived directly from the DRAIN pin, eliminating the need for a bias winding and associated circuitry. SC1117DG combines a high-voltage power MOSFET switch with a power supply controller in one device. Unlike conventional PWM (pulse width modulator) controllers, a simple ON/OFF control regulates the output voltage. The controller consists of an oscillator, feedback (sense and logic) circuit, 5.8 V regulator, BYPASS pin undervoltage circuit, over-temperature protection, frequency jittering, current limit circuit, and leading edge blanking integrated with a 700 V power MOSFET. The SC1117DG incorporates additional circuitry for auto-restart.

• Fully integrated auto-restart for short circuit and open-loop protection
• Frequency jittering greatly reduces EMI
• Meets HV creepage requirements between DRAIN and all other pins both on the PCB and at the package
• Lowest component count switcher solution
• Accurate hysteretic thermal shutdown protection – automatic recovery improves field reliability
• Universal input range allows worldwide operation
• Simple ON/OFF control, no loop compensation needed
• Very low component count – higher reliability and single side printed circuit board
• Auto-restart reduces delivered power by 95% during short circuit and open-loop fault conditions
• High bandwidth provides fast turn-on with no overshoot and excellent transient load response
• Ideal for Buck/Buck-Boost configuration
• Simplified feedback in non-isolated flyback configuration
• Easily meets all global energy efficiency regulations with no added components
• No-load consumption < 300 mW without bias winding at 265 VAC input (< 30 mW with bias winding)
• ON/OFF control provides constant efficiency to very light loads – ideal for mandatory CEC regulations

• Supplies for appliances, industrial systems, and metering