DESCRIPTION

The AMC3842B/43B/44B/45B are fixed frequency current-mode PWM controllers specially designed for OFF-Line switching power supply and DC-to-DC converters with a minimum number of external components. These devices feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totempole output which is suitable for driving MOSFETs.

FEATURES

?● Low Start-Up current (max. 200μA)

?● Optimized for Off-Line and DC-to-DC Converters

?● Maximum Duty Cycle

?● U.V.L.O. with Hysteresis

?● Operating Frequency Up to 500KHz

?● Internal Trimmed Bandgap Reference

?● High Current Totem Pole Output

?● Error Amplifier With Low Output Resistance

?● Available in 8-Pin Plastic DIP and Surface Mount 14-Pin S.O.I.C.

?● Identical pin assignment to earlier UC384X series.