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, inputundervoltage lockout with selectable thresholds, and reference undervoltage lockout.These devices are available in dual-in-line and surface mount packages.
●Features
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● Zero Voltage Switch Resonant Mode Operation
● Variable Frequency Oscillator with a Control Range Exceeding 1000:1
● Precision One-Shot Timer for Controlled Off-Time
● 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
