UC1843A Datasheet PDF - TI

The UCx84xA family of control ICs is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

● Optimized for Off-Line and DC-DC Converters

● Low Start-Up Current (< 0.5 mA)

● Trimmed Oscillator Discharge Current

● Automatic Feedforward Compensation

● Pulse-by-Pulse Current Limiting

● Enhanced Load Response Characteristics

● Undervoltage Lockout With Hysteresis

● Double Pulse Suppression

● High-Current Totem Pole Output

● Internally-Trimmed Bandgap Reference

● Up to 500-kHz Operation