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LM7905CT 数据手册 - National
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LM7905CT数据手册
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TL/H/7340
LM79XX Series 3-Terminal Negative Regulators
November 1994
LM79XX Series 3-Terminal Negative Regulators
General Description
The LM79XX series of 3-terminal regulators is available with
fixed output voltages of
b
5V,
b
8V,
b
12V, and
b
15V.
These devices need only one external componentÐa com-
pensation capacitor at the output. The LM79XX series is
packaged in the TO-220 power package and is capable of
supplying 1.5A of output current.
These regulators employ internal current limiting safe area
protection and thermal shutdown for protection against vir-
tually all overload conditions.
Low ground pin current of the LM79XX series allows output
voltage to be easily boosted above the preset value with a
resistor divider. The low quiescent current drain of
these devices with a specified maximum change with line
and load ensures good regulation in the voltage boosted
mode.
For applications requiring other voltages, see LM137 data
sheet.
Features
Y
Thermal, short circuit and safe area protection
Y
High ripple rejection
Y
1.5A output current
Y
4% tolerance on preset output voltage
Connection Diagrams
TO-220 Package
TL/H/7340–14
Front View
Order Number LM7905CT, LM7912CT or LM7915CT
See NS Package Number TO3B
Typical Applications
Fixed Regulator
TL/H/7340–3
*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.
²
Required for stability. For value given, capacitor must be
solid tantalum. 25 mF aluminum electrolytic may be substi-
tuted. 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.
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
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