UC2844
Description
TheUC3842/3/4/5family of controlICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal externalparts count.Internallyimplementedcircuits include undervoltagelockout featuring start-up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM paratorwhich also providescurrentlimit control,and a totem pole output stage designed to source or sink high peak current.
Key Features
- The output stage, suitable for driving N-Channel MOSFETs, is low in theoff-state
- Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges
- The UC3842 and UC3843 can operate to duty cycles approaching 100%
- October 1998 1/11 UC2842/3/4/5-UC3842/3/4/5
