LM145 LM345 Negative Three Amp Regulator
January 1995
LM145 LM345 Negative Three Amp Regulator
General Description
The LM145 is a three-terminal negative regulator with a
fixed output voltage of
b
5V and up to 3A load current capa-
bility This device needs only one external component a
compensation capacitor at the output making it easy to ap-
ply Worst case guarantees on output voltage deviation due
to any combination of line load or temperature variation
assure satisfactory system operation
Exceptional effort has been made to make the LM145 im-
mune to overload conditions The regulator has current lim-
iting which is independent of temperature combined with
thermal overload protection Internal current limiting pro-
tects against momentary faults while thermal shutdown pre-
vents junction temperatures from exceeding safe limits dur-
ing prolonged overloads
Although primarily intended for fixed output voltage applica-
tions the LM145 may be programmed for higher output volt-
ages with a simple resistive divider The low quiescent drain
current of the device allows this technique to be used with
good regulation
The LM145 comes in a hermetic TO-3 package rated at
25W A reduced temperature range part LM345 is also avail-
able
Features
Y
Y
Y
Y
Y
Y
Y
Y
Output voltage accurate to better than
g
2%
Current limit constant with temperature
Internal thermal shutdown protection
Operates with input-output voltage differential of 2 8V at
full rated load over full temperature range
Regulation guaranteed with 25W power dissipation
3A output current guaranteed
Only one external component needed
P
a
Product Enhancement tested
Schematic Diagram
TL H 7785 鈥?1
C
1995 National Semiconductor Corporation
TL H 7785
RRD-B30M115 Printed in U S A
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