KA7515

www.fairchildsemi.com KA7515 SMPS Controller Features Good load regulation over a wide load for external components. Internal soft-start for quiet start-up. Start-up supply current less than 1.6mA. Switch-oft supply current less than 10mA. Burst operation under short-circuit conditions Thermal shutdown through over-temperature. Description The KA7515 provides the necessary features to implement switching mode power supply with a minimal external parts count. Internally implemented circuits include 3V reference voltage block, supply voltage monitoring block to control output through supply voltage and overload amplifier block to control output by external road variation. The KA7515 controls the power MOSFET and performs all necessary regulation and monitoring function in free running flyback converters. 8-DIP 1 Internal Block Diagram Rev. 5.0 ©2000 Fairchild Semiconductor International KA7515 Absolute Maximum Ratings (TA=25°C) Parameter Supply Voltage Collector Supply Voltage Output current, Sink or Source Operating Temperature Storage Temperature Symbol VCC VC IO TOPR TSTG Value 20 13 12 -25 ~ + 85 -65 ~ + 150 Unit V V mA °C °C Electrical Characteristics (TA = 25°C) Parameter Start-up Hysteresis Start-up Current (1) Start-up Current (2) Start-up Current (3) Switch On Voltage Switch Off Voltage Switch On Current Switch Off Current Voltage Limiter (Pin 2) Voltage Limiter (Pin 3) Control Input Voltage Gain In Control Range Basic Value Maximum Peak Value Ove...