[[Champion Microelectronic Corp.]

GENERAL DESCRIPTION

The CM3842/43 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 totem pole output which is suitable for driving MOSFETs.

FEATURES

◆ Low Start-Up current ( typ. 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 8-Pin S.O.I.C.

APPLICATIONS

◆ Off-line flyback or forward converters.

◆ DC-to-DC buck or boost converter.

◆ Monitor Power Supply]