• Document: KA7500C. SMPS Controller. Features. Description. Internal Block Diagram.
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www.fairchildsemi.com KA7500C SMPS Controller Features Description • Internal regulator provides a stable 5V reference supply The KA7500C is used for the control circuit of the pulse trimmed to ±1 % Accuracy. width modulation switching regulator. The KA7500C con- • Uncommitted output TR for 200mA sink or source sists of 5V reference voltage circuit, two error amplifiers, current flip flop, an output control circuit, a PWM comparator, a • Output control for push-pull or single-ended operation dead time comparator and an oscillator. This device can be • Variable duty cycle by dead time control (pin 4) Complete operated in the switching frequency of 1 KHz to 300 KHz. PWM control circuit The precision of voltage reference(Vref) is improved up to • On-chip oscillator with master or slave operation ±1% with trimming. This provides a better output voltage • Internal circuit prohibits double pulse at either output regulation. The operating temperature range is -25°C ~ +85°C 16-DIP 1 16-SOP 1 Internal Block Diagram Rev. 5.0 ©2000 Fairchild Semiconductor International KA7500C Absolute Maximum Ratings Parameter Symbol Value Unit Supply Voltage VCC 42 V Collector Supply Voltage VC 42 V Output Current IO 250 mA Amplifier Input Voltage VIN VCC + 0.3 V 1 (KA7500C) Power Dissipation (TA = 25°C) PD W 0.9 (KA7500CD) Operating Temperature Range TOPR -25 ~ +85 °C Storage Temperature Range TSTG -65 ~ + 150 °C Recommended Operationg Conditions Parameter Symbol Min. Typ. Max. Unit Power Supply Voltage VCC 7.0 15 40 V Collector Output Voltage VC1,VC2 - 30 40 V Collector Output Current (Each transistor) IC1,IC2 - - 200 mA Amplifier Input Voltage VIN 0.3 - VCC-2.0 V Current Into Feedback Terminal Ifb - - 0.3 mA Reference Output Current Iref - - 10 mA Timing Resistor RT 1.8 30 500 ΚΩ Timing Capacitor CT 0.0047 0.001 10 uF Oscillator Frequency fosc 1.0 40 200 kHz PWM Input Voltage (Pins 3, 4, 13) - 0.3 - 5.3 V 2 KA7500C Electrical Characteristics (VCC = 20V, f = 10KHz, TA = -25°C to + 85°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit REFERENCE SECTION IREF = 1mA, TA=25°C(Note1) 4.95 5.0 5.05 Reference Output Voltage VREF V IREF = 1mA 4.9 5.0 5.1 Line Regulation RLine VCC = 7V to 40V - 2.0 25 mV Load Regulation RLOAD IREF = 1mA to 10mA - 1.0 15 mV Short-Circuit Output Current ISC VREF = 0V

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