Description
The SQ6601PT is a hybrid IC consists from power MOSFET and a controller IC, designed for Indirect feed-back Quasi-Resonant (including low frequency PRC)fly-back converter type SMPS (Switching Mode Power Supply) applications. this IC realizes high efficiency, low noise, downsizing and standardizing of a power supply system reducing external components count and simplifying the circuit designs. the device is provided in a five pin over-molded TO-220 style package, affording dielectric isolation without compromising thermal characteristics. (Note). PRC is abbreviation of “Pulse Ratio Control” (On-width control with fixed OFF-time).

Features
• Quasi-Resonant Operation
• Low-loss, Pulse-Ration-Control standby mode
• Under-voltage lockout with Hysteresis
• Adjustable switching speed for EMI control
• Low start-up circuit current (100uA max)
• Active low-pass filter for stabilizing the operation in case of light load
• Avalanche Energy Guaranteed MOSFET with high VDSS
• Built-in constant voltage drive circuit
• Built-in step drive circuit
• Built-in low frequency PRC mode (≒20kHz)
• Pulse-by-pulse Overcurrent Protection (OCP)
• Overvoltage Protection with latch mode (OVP)
• Thermal Shutdown with latch mode (TSD)
• Over-molded Five-Pin Package