Controlled Baseline

− One Assembly/Test Site, One Fabrication

Site

Extended Temperature Performance of

−55°C to 125°C

Enhanced Diminishing Manufacturing

Sources (DMS) Support

Enhanced Product Change Notification

Qualification Pedigree†

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 RO Error Amp

description

The UC1842A/3A/4A/5A family of control ICs is a pin-for-pin compatible improved version of the UC3842/3/4/5

family. Providing the necessary features to control current mode switched mode power supplies, this family has

the following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is

trimmed to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V

for VCC over 5 V.

The difference between members of this family are shown in the table below.