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 enhanced features. Startup current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3mA. During the under-voltage lockout, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V.
