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LM7800 Datasheet

  • LM7800

  • 3-Terminal Positive Regulators(324.81 k)

  • 326.36KB

  • 14頁

  • ETC

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LM140A LM140 LM340A LM340 LM7800C Series 3-Terminal Positive Regulators
January 1995
LM140A LM140 LM340A LM340 LM7800C
Series 3-Terminal Positive Regulators
General Description
The LM140A LM140 LM340A LM340 LM7800C monolith-
ic 3-terminal positive voltage regulators employ internal cur-
rent-limiting thermal shutdown and safe-area compensa-
tion making them essentially indestructible If adequate
heat sinking is provided they can deliver over 1 0A output
current They are intended as fixed voltage regulators in a
wide range of applications including local (on-card) regula-
tion for elimination of noise and distribution problems asso-
ciated with single-point regulation In addition to use as fixed
voltage regulators these devices can be used with external
components to obtain adjustable output voltages and cur-
rents
Considerable effort was expended to make the entire series
of regulators easy to use and minimize the number of exter-
nal components It is not necessary to bypass the output
although this does improve transient response Input by-
passing is needed only if the regulator is located far from
the filter capacitor of the power supply
The 5V 12V and 15V regulator options are available in the
steel TO-3 power package The LM340A LM340 LM7800C
series is available in the TO-220 plastic power package and
the LM7805 and LM7812 are also available in the surface-
mount TO-263 package
Features
Y
Y
Y
Y
Y
Y
Y
Y
Complete specifications at 1A load
Output voltage tolerances of
g
2% at T
j
e
25 C and
g
4% over the temperature range (LM140A LM340A)
Line regulation of 0 01% of V
OUT
V of
DV
IN
at 1A load
(LM140A LM340A)
Load regulation of 0 3% of V
OUT
A (LM140A LM340A)
Internal thermal overload protection
Internal short-circuit current limit
Output transistor safe area protection
P
a
Product Enhancement tested
Device
Output Voltages
Packages
TO-3 (K)
TO-3 (K) TO-220 (T)
TO-220 (T) TO-263 (S)
(5V and 12V only)
LM140A LM140 5 12 15
LM340A LM340 5 12 15
LM7800C
5 6 8 12 15
18 24
Typical Applications
Fixed Output Regulator
Adjustable Output Regulator
Current Regulator
TL H 7781 鈥?
TL H 7781 鈥?3
Required if the regulator is located far from the
power supply filter
Although no output capacitor is needed for sta-
bility it does help transient response (If need-
ed use 0 1
mF
ceramic disc)
TL H 7781 鈥?2
V2-3
a
I
Q
I
OUT
e
R1
DI
Q
e
1 3 mA over line and load changes
V
OUT
e
5V
a
(5V R1
a
I
Q
) R2 5V R1
l
3 I
Q
load regulation (L
r
)
(R1
a
R2) R1 (L
r
of
LM340-5)
C
1995 National Semiconductor Corporation
TL H 7781
RRD-B30M115 Printed in U S A

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