MC44603AP - Enhanced Mixed Frequency Mode GreenLine TM PWM Controller:Fixed Frequency, Variable Frequency,Standby Mode

The MC44603A is an enhanced high performance controller that is

specifically designed for off–line and dc–to–dc converter applications. This

device has the unique ability of automatically changing operating modes if

the converter output is overloaded, unloaded, or shorted, offering the

designer additional protection for increased system reliability. The

MC44603A has several distinguishing features when compared to

conventional SMPS controllers. These features consist of a foldback facility

for overload protection, a standby mode when the converter output is slightly

loaded, a demagnetization detection for reduced switching stresses on

transistor and diodes, and a high current totem pole output ideally suited for

driving a power MOSFET. It can also be used for driving a bipolar transistor

in low power converters (< 150 W). It is optimized to operate in

discontinuous mode but can also operate in continuous mode. Its advanced

design allows use in current mode or voltage mode control applications.

Current or Voltage Mode Controller

• Operation up to 250 kHz Output Switching Frequency

• Inherent Feed Forward Compensation

• Latching PWM for Cycle–by–Cycle Current Limiting

• Oscillator with Precise Frequency Control

High Flexibility

• Externally Programmable Reference Current

• Secondary or Primary Sensing

• Synchronization Facility

• High Current Totem Pole Output

• Undervoltage Lockout with Hysteresis

Safety/Protection Features

• Overvoltage Protection Against Open Current and Open Voltage Loop

• Protection Against Short Circuit on Oscillator Pin

• Fully Programmable Foldback

• Soft–Start Feature

• Accurate Maximum Duty Cycle Setting

• Demagnetization (Zero Current Detection) Protection

• Internally Trimmed Reference

• Enhanced Output Drive

GreenLine Controller: Low Power Consumption in Standby Mode

• Low Startup and Operating Current

• Fully Programmable Standby Mode

• Controlled Frequency Reduction in Standby Mode

• Low dV/dT for Low EMI Radiations

GreenLine is a trademark of Motorola, Inc.

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