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DESCRIPTION Fixed frequency current-mode PWM controller. It is specially designed for Off Line And DC-to-DC converter applications with minimal external component. This integrated circuit features a trimmed oscillator for precise duty cycle control. a temperature compensated reference, high gain arror amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built in under-voltage lockout and current limiting. FEATURES  Automatic Feed Forward Compensation High Gain Totem Pole Output Internally Trimmed Bandgap Reference Undervoltage Lockout with Hysteresis Low Start Up Current Optimized for offline converter Double pulse suppression Current mode operation to 500KHz