DESCRIPTION

are fixed frequency current mode PWM controller. They are specially designed for OFF−Line and DC to DC converter applications with a minimal 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, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current limiting.

FEATURES

•  Low Start-Up and Operating Current

•  High Current Totem Pole Output

•  Undervoltage Lockout With Hysteresis

•   Operating Frequency Up To