The MC34067/MC33067 are high performance zero voltage switch resonant mode controllers designed for off- line and dc- to- dc converter applications that utilize frequency modulated constant off-time or constant deadtime control. These integrated circuits feature a variable frequency oscillator, a precise retriggerable one-shot timer, temperature compensated reference, high gain wide bandwidth error amplifier, steering flip-flop, and dual high current totem pole outputs ideally suited for driving power MOSFETs.
Also included are protective features consisting of a high speed fault comparator and latch, programmable soft- start circuitry, input undervoltage lockout with selectable thresholds, and reference undervoltage lockout. These devices are available in dual-in-line and surface mount packages.
Features
•Zero Voltage Switch Resonant Mode Operation
•Variable Frequency Oscillator with a Control Range Exceeding 1000:1
•Precision One-Shot Timer for Controlled Off-T ime
•Internally Trimmed Bandgap Reference
•4.0 MHz Error Amplifier
•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
•Pb-Free Packages are Available*
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MC34067.pdf
