LM3842/3/4/5/A

CURRENT MODE PWM CONTROLLER

Description

LM3842/3/4/5/A

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

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.

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