MC-4  -  Series DataSheet
MC44608  -  Few External Components Reliable and Flexible SMPS Controller  -  ON Semiconductor  -  AC-DC Off-Line Controllers

  The MC44608 is a high performance voltage mode controller designed for off−line converters. This high voltage circuit that integrates the startup current source and the oscillator capacitor, requires few external components while offering a high flexibility and reliability.
  The device also features a very high efficiency standby management consisting of an effective Pulsed Mode operation. This technique enables the reduction of the standby power consumption to approximately 1.0 W while delivering 300 mW in a 150 W SMPS.
General Features
• Integrated Startup Current Source
• Lossless Off−Line Startup
• Direct Off−Line Operation
• Fast Startup
• Flexibility
• Duty Cycle Control
• Undervoltage Lockout with Hysteresis
• On Chip Oscillator Switching Frequency 40 or 75
• Secondary Control with Few External Components
• Pb−Free Packages are Available* Protections
• Maximum Duty Cycle Limitation
• Cycle by Cycle Current Limitation
• Demagnetization (Zero Current Detection) Protection
• “Over VCC Protection” Against Open Loop
• Programmable Low Inertia Over Voltage Protection Against Open Loop
• Internal Thermal Protection SMPS Controller
• Pulsed Mode Techniques for a Very High Efficiency Low Power Mode
• Lossless Startup
• Low dV/dT for Low EMI Radiations