DESCRIPTION

The LM384xA are fixed frequency current-mode PWM controller. They are specially designed for Off-Line and DC-to-DC converter applications with minimal external components.

These integrated circuits features 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 ideally suited for driving a power MOSFET.

Protection circuitry includes built in under-voltage lockout and current limiting.

FEATURES

● Automatic feed forward compensation

● Optimized for offline converter

● Double pulse suppression

● Current mode operation to 500 KHz

● High gain totem pole output

● Internally trimmed bandgap reference

● Undervoltage lockout with hysteresis

● Low start up current :＜ 0.3 mA

● Moisture Sensitivity Level 3