HTC KOREA LM3842/3 Current Mode PWM Controller

- 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.