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LM120 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI)

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Giải thích chi tiết về linh kiện  Series 3-Terminal Negative Regulators
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TLH7767
November 1994
LM120LM320
Series 3-Terminal Negative Regulators
General Description
The LM120 series are three-terminal negative regulators
with a fixed output voltage of b5V b12V and b15V and
up to 15A load current capability Where other voltages are
required the LM137 and LM137HV series provide an output
voltage range of b12V to b47V
The LM120 need only one external componenta compen-
sation capacitor at the output making them easy to apply
Worst case guarantees on output voltage deviation due to
any combination of line load or temperature variation as-
sure satisfactory system operation
Exceptional effort has been made to make the LM120 Se-
ries immune to overload conditions The regulators have
current limiting which is independent of temperature com-
bined with thermal overload protection Internal current limit-
ing protects against momentary faults while thermal shut-
down prevents junction temperatures from exceeding safe
limits during prolonged overloads
Although primarily intended for fixed output voltage applica-
tions the LM120 Series may be programmed for higher out-
put voltages with a simple resistive divider The low quies-
cent drain current of the devices allows this technique to be
used with good regulation
Features
Y
Preset output voltage error less than g3%
Y
Preset current limit
Y
Internal thermal shutdown
Y
Operates with input-output voltage differential down to
1V
Y
Excellent ripple rejection
Y
Low temperature drift
Y
Easily adjustable to higher output voltage
LM120 Series Packages and Power Capability
Rated
Design
Device
Package
Power
Load
Dissipation
Current
LM120LM320
TO-3 (K)
20W
15A
TO-39 (H)
2W
05A
LM320
TO-220 (T)
15W
15A
LM320M
TO-202 (P)
75W
05A
Typical Applications
Dual Trimmed Supply
TLH7767 – 3
Fixed Regulator
TLH7767 – 2
Required if regulator is separated from filter capacitor by more than 3
For
value given capacitor must be solid tantalum 25 mF aluminum electrolytic
may be substituted
Required for stability For value given capacitor must be solid tantalum 25
m
F aluminum electrolytic may substituted Values given may be increased
without limit
For output capacitance in excess of 100 mF a high current diode from
input to output (1N4001 etc) will protect the regulator from momentary
input shorts
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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