herunterladen
TL/H/7744
LM78LXX Series 3-Terminal Positive Regulators
February 1995
LM78LXX Series 3-Terminal Positive Regulators
General Description
The LM78LXX series of three terminal positive regulators is
available with several fixed output voltages making them
useful in a wide range of applications. When used as a ze-
ner diode/resistor combination replacement, the LM78LXX
usually results in an effective output impedance improve-
ment of two orders of magnitude, and lower quiescent cur-
rent. These regulators can provide local on card regulation,
eliminating the distribution problems associated with single
point regulation. The voltages available allow the LM78LXX
to be used in logic systems, instrumentation, HiFi, and other
solid state electronic equipment.
The LM78LXX is available in the metal three-lead TO-39(H)
package, the plastic TO-92 (Z) package, and the plastic
SO-8 (M) package. With adequate heat sinking the regulator
can deliver 100 mA output current. Current limiting is includ-
ed to limit the peak output current to a safe value. Safe area
protection for the output transistors is provided to limit inter-
nal power dissipation. If internal power dissipation becomes
too high for the heat sinking provided, the thermal shutdown
circuit takes over preventing the IC from overheating.
Features
Y
Output voltage tolerances of
g
5% (LM78LXXAC) over
the temperature range
Y
Output current of 100 mA
Y
Internal thermal overload protection
Y
Output transistor safe area protection
Y
Internal short circuit current limit
Y
Available in plastic TO-92 and metal TO-39 and plastic
SO-8 low profile packages
Y
No external components
Y
Output voltages of 5.0V, 6.2V, 8.2V, 9.0V, 12V, 15V
Connection Diagrams
(TO-39)
Metal Can Package (H)
TL/H/7744–1
Bottom View
Order Number LM78L05ACH,
LM78L12ACH or LM78L15ACH
See NS Package Number H03A
SO-8 Plastic (M)
(Narrow Body)
TL/H/7744–2
Top View
Order Number LM78L05ACM,
LM78L12ACM or LM78L15ACM
See NS Package Number M08A
(TO-92)
Plastic Package (Z)
TL/H/7744–3
Bottom View
Order Number
LM78L05ACZ, LM78L09ACZ,
LM78L12ACZ, LM78L15ACZ,
LM78L62ACZ or LM78L82ACZ
See NS Package Number Z03A
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
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