High Safety Standby Ladder Mode GreenLine™ PWM Controller
●The MC44604 is an enhanced high performance controller that is specifically designed for off–line and dc–to–dc converter applications.
●The MC44604 is a modification of the MC44603. The MC44604 offers enhanced safety and reliable power management in its protection features (foldback, overvoltage detection, soft–start, accurate demagnetization detection). Its high current totem pole output is also ideally suited for driving a power MOSFET but can also be used for driving a bipolar transistor in low power converters (< 150 W).
●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
●• 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
●GreenLine Controller:
●• Low Startup and Operating Current
●• Patented Standby Ladder Mode for Low Standby Losses
●• Low dV/dT for Low EMI
