MC34067DWR2G

ZVS零电压开关谐振模式工作

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

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Variable Frequency Oscillator with a Control Range Exceeding 1000:1

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Precision One-Shot Timer for Controlled Off-Time

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Internally Trimmed Bandgap Reference

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4.0 MHz Error Amplifier

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Dual High Current Totem Pole Outputs

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Selectable Undervoltage Lockout Thresholds with Hysteresis

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Enable Input

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Programmable Soft-Start Circuitry

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Low Startup Current for Off-Line Operation

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Pb-Free Packages are Available*