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