High Safety Pulsed Mode Standby GreenLine PWM Controller

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.

Current 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

• Pulsed Mode Standby for Low Standby Losses

• Low dV/dT for Low EMI

Features

• Pb−Free Package is Available*