GENERAL DESCRIPTION
The LND3842B/43B/44B/45B and LND3842A/43A/44A/45A are fixed frequency current mode PWM controllers. They are specially designed for OFF-line and DC to DC converter applications with a minimal of external components. Internally implemented circuits include a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator. Protection circuitry includes undervoltage lockout and current limiting.

FEATURES
• Low start-up and operating Current
• High Current Totem Pole Output
• Undervoltage Lockout with Hysterisis
• Operating Frequency up to 500KHZ