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LM345
Negative 3-Amp Regulator
TL/H/7785
LM145/LM345
Negative
Three
Amp
Regulator
January 1995
LM145/LM345 Negative Three Amp Regulator
General Description
The LM145isa three-terminal negative regulator witha
fixed output voltageof b5Vandupto3A load current capa-
bility. This device needs onlyone external componentÐa
compensation capacitoratthe output, makingit easytoap-
ply. Worst case guaranteeson output voltage deviationdue any combinationof line, loador temperature variation
assure satisfactory system operation.
Exceptional efforthas been madeto makethe LM145im-
muneto overload conditions.The regulatorhas currentlim-
iting whichis independentof temperature, combined with
thermal overload protection. Internal current limiting pro-
tects against momentary faults while thermal shutdownpre-
vents junction temperatures from exceeding safe limitsdur-
ing prolonged overloads.
Although primarily intendedfor fixed output voltage applica-
tions, theLM145 maybe programmedfor higher output volt-
ages witha simple resistive divider.Thelow quiescent drain
currentofthe device allowsthis techniquetobe used with
good regulation.
The LM145 comesina hermetic TO-3 package ratedat
25W.A reduced temperaturerangepart LM345isalso avail-
able.
Features Output voltage accurateto better than g2% Current limit constant with temperature Internal thermal shutdown protection Operates with input-output voltage differentialof 2.8Vat
full rated load overfull temperature range Regulation guaranteed with 25W power dissipation3A output current guaranteed Onlyone external component needed Pa Product Enhancement tested
Schematic Diagram
TL/H/7785–1
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
