MC34067PG

The MC34067PG is a high-performance Resonant Mode Controller designed for off- line and DC to DC converter applications that utilize frequency modulated constant off-time or constant deadtime control. It features 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.

• 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
• 4MHz 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

Applications

Industrial