KA3843B

FAIRCHILD SEMICONDUCTOR  KA3843B  控制器, PWM, 25V-12V电源, 500 kHz, 5V/200mA输出, DIP-8

The is a fixed frequency current-mode PWM Controller for off-line and DC-to-DC converter applications with minimum external components. This integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator and a high current totem pole output ideally suited for driving a power MOSFET. The KA3843B is 8.5V on and 7.9V off and it can operate within 100% duty cycle.

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Low start up current

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Maximum duty clamp

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UVLO with hysteresis