LM3842/3

HTC Korea 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.

LM3842/3 features :

• Automatic feed forward compensation
• Optimized for offline converter
• Double pulse suppression
• Current mode operation to 500kHz
• High gain totem pole output
• Internally trimmed bandgap reference
• Undervoltage lockout with hysteresis
• Low start up current: < 0.3mA
  
• Moisture sensitivity level 3