Description
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. 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
*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

MC33066, MC34066DW, MC34066P, MC33066DW, MC33066P

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Description
The Series STR-F6600 is specifically designed to satisfy the requirements for increased integration and reliability in off-line quasi-resonant flyback converters.
The series incorporates a primary control and drive circuit with discrete avalanche-rated power MOSFETs.
Covering the power range from below 25 watts up to 300 watts for 100/115/230 VAC inputs, and up to 150 watts for 85 to 265 VAC universal input, these devices can be used in a range of applications, from battery chargers and set top boxes, to televisions, monitors, and industrial power supply units.
Cycle-by-cycle current limiting, under-voltage lockout with hysteresis, over-voltage protection, and thermal shutdown protects the power supply during the normal overload and fault conditions.
Over-voltage protection and thermal shutdown are latched after a short delay.
The latch may be reset by cycling the input supply.
Low-current startup and a low-power standby mode selected from the secondary circuit completes a comprehensive suite of features.
The series is provided in a five-pin overmolded TO-3P style package, affording dielectric isolation without compromising thermal characteristics.

FEATURES
*Flyback Operation with Quasi-Resonant Soft Switching
for Low Power Dissipation and EMI
*Rugged Avalanche-Rated MOSFET
*Choice of MOSFET Voltage and rDS(on)
*Full Over-Current Protection (no blanking)
*Under-Voltage Lockout with Hysteresis
*Over-Voltage Protection
*Direct Voltage Feedback
*Low Start-up Current (<400 μA)
*Low-Frequency, Low-Power Standby Operation
*Overmolded 5-Pin Package

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