IL3843

TECHNICAL DATA Fixed Frequency Current Mode PWM Controller IL3843 DESCRIPTION Fixed frequency current-mode PWM controller. It is specially designed for Off Line And DC-to-DC converter applications with minimal external component. This integrated circuit features a trimmed oscillator for precise duty cycle control. a temperature compensated reference, high gain arror amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built in under-voltage lockout and current limiting. www.DataSheet4U.com FEATURES ♦ Automatic Feed Forward Compensation ♦High Gain Totem Pole Output ♦Internally Trimmed Bandgap Reference ♦Undervoltage Lockout with Hysteresis ♦Low Start Up Current ♦Optimized for offline converter ♦Double pulse suppression ♦Current mode operation to 500KHz ORDERING INFORMATION Device IL3843 Operating Temperature Range TA=0° to +70°C Package DIP-8 Rev. 01 IL3843 PIN FUNCTION DESCRIPTION Pin Function No. 1 Compensation 2 3 4 5 7 8 Voltage Feedback Current Sense RT/CT GND Vcc VREF Description This pln is the Error Amplifier output and is made available for loop compensation This is the inverting input of the Error Amplifier. It is normally connected to the switching power supply outpul through a resistor divider. A voltage proportional to inductor current is connected to this input. The PWM uses this. information to terminate the output switch conduction The Oscillator frequency an...