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uc3843 pdf

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The UC3842/UC3843/UC3844/UC3845 are  fixedfrequencycurrent-mode PWM controller. They  are specially  designed for Off-Line and DC to DC  converter applicaTIons with minimum external components.  These 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 totempole output for driving a Power MOSFET. The UC3842 and UC3844 have UVLO  thresholds of 16V (on)  and  10V  (off). The UC3843 and UC3845 are 8.5V(on) and 7.9V (off). The UC3842 and UC3843 can operate within  100% duty cycle. The UC3844 and UC3845 can operate with 50% duty cycle.
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