UC1543, UC1544
UC2543, UC2544
UC3543, UC3544
www.ti.com SLUS188A – APRIL 1997 – REVISED FEBRUARY 2007 Power Supply Supervisory Circuit
FEATURES Both over-and under-voltage sensing circuits can be
externally programmed for minimum time duration of
fault before triggering. All functions contain open
collector outputs which can be used independently or
wire-or’ed together, and although the SCR trigger is
directly connected only to the over-voltage sensing
circuit, it may be optionally activated by any of the
other outputs, or from an external signal. The O.V.
circuit also includes an optional latch and external
reset capability. Includes Over-Voltage, Under-Voltage, and
Current Sensing Circuits
Internal 1% Accurate Reference
Programmable Time Delays
SCR “Crowbar” Drive of 300 mA
Remote Activation Capability
Optional Over-Voltage Latch
Uncommitted Comparator Inputs for Low
Voltage Sensing (UC1544 Series Only) DESCRIPTION
The monolithic integrated circuits contain all the …
