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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