Current Mode PWM Controller 750mA 16-Pin PDIP Rail

The MC44605 is a high performance current mode controller that is specifically designed for off-line converters. This circuit has several distinguishing features that make it particularly suitable for multisynchronized monitor applications. The MC44605 synchronization arrangement enables operation from 16 kHz up to 130 kHz. This product was optimized to operate with universal mains voltage, i.e., from 80 V to 280 V, and its high current totem pole output makes it ideally suited for driving a power MOSFET. The MC44605 protections enable a well-controlled and safe power management. Four major faults while detected, activate the analogic counter of a disabling bl Deg Ck designed to perform a latched circuit output inhibition.

• This is a Pb-Free Device Current Mode Controller
• Current 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
• Externally Programmable Reference Current
• Secondary or Primary Sensing (Availability of Error Amplifier Output)
• Synchronization Facility
• High Current Totem Pole Output
• Vcc Undervoltage Lockout with Hysteresis
• Low Output dV/dT for Low EMI Radiations
• Low Startup and Operating Current Safety/Protection Features
• Soft-Start Feature
• Demagnetization (Zero Current Detection) Protection
• Overvoltage Protection Facility against Open Loop
• EHT Overvoltage Protection (E.H.T.OVP): Detection of too High Synchronization Pulses
• Winding Short Circuit Detection (W.S.C.D.)
• Limitation of the Maximum Input Power (M.P.L.): Calculation of Input Power for Overload Protection
• Overheating Detection (O.H.D.): to Prevent the Power Switch from an Excessive Heating