Flyback PWM Voltage-Mode Controller

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Overview

The MC44604 is an enhanced high performance controller that is specifically designed for off-line and dc-to-dc converter applications. Its high current totem pole output is ideally suited for driving a power MOSFET.

The MC44604 is an evolution of the MC44603A. Like the MC44603A, the MC44604 has been optimized to operate with universal ac mains voltage from 80 V to 280 V. It also offers enhanced safety and reliable power management thanks to its protection features (foldback, overvoltage detection, soft-start, accurate demagnetization detection).

In addition, the MC44604 offers a new efficient way to reduce the standby operating power by means of a so-called pulsed mode standby operation of the converter, significantly reducing the converter consumption in standby mode.

  • 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
  • High Current Totem Pole Output
  • Undervoltage Lockout with Hysteresis Safety/Protection Features
  • Overvoltage Protection Facility Against Open 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
  • Low Startup and Operating Current
  • Pulsed Mode Standby for Low Standby Losses
  • Low dV/dT for Low EMI
  • Pb-Free Package is Available

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