Current Mode PWM Controller 1A 8-Pin SOIC T/R

The UC2843A control IC is a pin-for-pin compatible improved version of the UC2843. Providing the necessary features to control current mode switched mode power supplies, this device has the following improved features. Start up current is specified to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During undervoltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

Qualified for Automotive Applications

Extended Temperature Performance of-40°C to 125°C

Optimized for Off-Line and DC-to-DC Converters

Low Start-Up Current (<0.5 mA)

Trimmed Oscillator-Discharge Current

Automatic Feed-Forward Compensation

Pulse-by-Pulse Current Limiting

Enhanced Load-Response Characteristics

Under-Voltage Lockout With Hysteresis

Double-Pulse Suppression

High-Current Totem-Pole Output

Internally Trimmed Bandgap Reference

500-kHz Operation

Low R_O Error Amp