深圳市中立信电子科技有限公司

UC2843AD8TR

1• 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

• Create a Custom Design Using the UCx84xA With

the WEBENCH® Power Designer
UC2843AD8TR  

2  Applications

• Switch Mode Power Supplies (SMPS)

• DC-DC Converters

• Power Modules

• Industrial PSU

• Battery Operated PSU

3    UC2843AD8TR Description

The UCx84xA family of control devices is a pin-for-pin

compatible improved version of the UCx84x family.

Providing the necessary features to control currentmode

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.