KA7500B

www.fairchildsemi.com KA7500B SMPS Controller Features Internal Regulator Provides a Stable 5V Reference Supply Trimmed to 5% Uncommitted Output TR for 200mA Sink or Source Current Output Control For Push-Pull or Single Ended Operation Variable Duty Cycle By Dead Time Control (Pin 4) Complete PWM Control Circuit On-Chip Oscillator With Master or Slave Operation Internal Circuit Prohibits Double Pulse at Either Output Description The KA7500B is used for the control circuit of the PWM switching regulator. The KA7500B consists of 5V reference voltage circuit, two error amplifiers, a flip flop, an output control circuit, a PWM comparator, a dead time comparator and an oscillator. This device can be operated in the switching frequency of 1kHz to 300kHz. 16-DIP 1 16-SOP 1 Internal Block Diagram Rev. 1.0.0 ©2002 Fairchild Semiconductor Corporation KA7500B Absolute Maximum Ratings Parameter Supply Voltage Collector Supply Voltage Output Current Amplifier Input Voltage Power Dissipation (TA = 25°C) Operating Temperature Range Storage Temperature Range Symbol VCC VC IO VIN PD TOPR TSTG Value 42 42 250 VCC +0.3 1 (KA7500B) 0.9 (KA7500BD) 0 ~ +70 -65 ~ +150 Unit V V mA V W °C °C 2 KA7500B Electrical Characteristics (VCC = 20V, f = 10kHz, TA = 0°C to +70°C, unless otherwise specified) Parameter REFERENCE SECTION Reference Output Voltage Line Regulation Temperature Coefficient of VREF Load Regulation Short-Circuit Output Current OSCILLATOR SECTION Oscillation Frequ...