HIGH PERFORMANCE RESONANT MODE CONTROLLERS

The MC34066/MC33066 are high performance resonant mode controllers designed for off–line and dc–to–dc converter applications that utilize frequency modulated constant on–time or constant off–time control. These integrated circuits feature a variable frequency oscillator with programmable deadtime, precision retriggerable one–shot timer, temperature compensated reference, high gain wide–bandwidth error amplifier with a precision output clamp, steering flip–flop, and dual high current totem pole outputs ideally suited for driving power MOSFETs.

•Variable Frequency Oscillator with a Control Range Exceeding 1000:1

•Programmable Oscillator Deadtime Allows Constant Off–Time Operation

•Precision Retriggerable One–Shot Timer

•Internally Trimmed Bandgap Reference

•5.0 MHz Error Amplifier with Precision Output Clamp

•Dual High Current Totem Pole Outputs

•Selectable Undervoltage Lockout Thresholds with Hysteresis

•Enable Input

•Programmable Soft–Start Circuitry

•Low Startup Current for Off–Line Operation