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LM-340 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer LM-340
Beschreibung Series 3-Terminal Positive Regulators
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 14 Seiten
LM-340 Datasheet, Funktion
January 1995
LM140A LM140 LM340A LM340 LM7800C
Series 3-Terminal Positive Regulators
General Description
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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 Complete specifications at 1A load
Y Output voltage tolerances of g2% at Tj e 25 C and
g4% over the temperature range (LM140A LM340A)
Y Line regulation of 0 01% of VOUT V of DVIN at 1A load
(LM140A LM340A)
Y Load regulation of 0 3% of VOUT A (LM140A LM340A)
Y Internal thermal overload protection
Y Internal short-circuit current limit
Y Output transistor safe area protection
Y Pa Product Enhancement tested
Device Output Voltages
Packages
LM140A LM140 5 12 15
TO-3 (K)
LM340A LM340 5 12 15
TO-3 (K) TO-220 (T)
LM7800C
5 6 8 12 15
18 24
TO-220 (T) TO-263 (S)
(5V and 12V only)
Typical Applications
Fixed Output Regulator
Adjustable Output Regulator
Current Regulator
TL H 7781–1
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 – 2
VOUT e 5V a (5V R1 a IQ) R2 5V R1 l 3 IQ
load regulation (Lr)
(R1 a R2) R1 (Lr of
LM340-5)
TL H 7781 – 3
V2-3
IOUT e R1 a IQ
DIQ e 1 3 mA over line and load changes
C1995 National Semiconductor Corporation TL H 7781
RRD-B30M115 Printed in U S A






LM-340 Datasheet, Funktion
LM7818C
Electrical Characteristics
0 C s TJ s a150 C VI e 27V IO e 500 mA CI e 0 33 mF CO e 0 1 mF unless otherwise specified
Symbol
Parameter
Conditions (Note 4)
LM7818C
Min Typ Max
VO
DVO
DVO
VO
IQ
DIQ
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VN
DVI DVO
VDO
RO
IOS
IPK
DVO DT
Output Voltage
Line Regulation
Load Regulation
Output Voltage
Quiescent Current
Quiescent
Current Change
With Line
With Load
Noise
Ripple Rejection
Dropout Voltage
Output Resistance
Output Short Circuit Current
Peak Output Current
Average Temperature
Coefficient of Output Voltage
TJ e 25 C
TJ e 25 C
21V s VI s 33V
24V s VI s 30V
TJ e 25 C
5 0 mA s IO s 1 5A
250 mA s IO s 750 mA
22V s VI s 33V 5 0 mA s IO s 1 0A P s 15W
TJ e 25 C
22V s VI s 33V
5 0 mA s IO s 1 0A
TA e 25 C 10 Hz s f s 100 kHz
f e 120 Hz IO e 350 mA TJ e 25 C
IO e 1 0A TJ e 25 C
f e 1 0 kHz
TJ e 25 C VI e 35V
TJ e 25 C
IO e 5 0 mA
17 3
17 1
53
18 0
15
50
12
40
45
110
69
20
22
0 20
21
10
18 7
360
180
360
180
18 9
80
10
05
Units
V
mV
mV
V
mA
mA
mV
dB
V
mX
A
A
mV C
LM7824C
Electrical Characteristics
0 C s TJ s a150 C VI e 33V IO e 500 mA CI e 0 33 mF CO e 0 1 mF unless otherwise specified
Symbol
Parameter
Conditions (Note 4)
LM7824C
Min Typ Max
Units
VO
DVO
DVO
VO
IQ
DIQ
VN
DVI DVO
VDO
RO
IOS
IPK
DVO DT
Output Voltage
Line Regulation
Load Regulation
Output Voltage
Quiescent Current
Quiescent
Current Change
With Line
With Load
Noise
Ripple Rejection
Dropout Voltage
Output Resistance
Output Short Circuit Current
Peak Output Current
Average Temperature
Coefficient of Output Voltage
TJ e 25 C
TJ e 25 C
27V s VI s 38V
30V s VI s 36V
TJ e 25 C
5 0 mA s IO s 1 5A
250 mA s IO s 750 mA
28V s VI s 38V 5 0 mA s IO s 1 0A P s 15W
TJ e 25 C
28V s VI s 38V
5 0 mA s IO s 1 0A
TA e 25 C 10 Hz s f s 100 kHz
f e 120 Hz IO e 350 mA TJ e 25 C
IO e 1 0A TJ e 25 C
f e 1 0 kHz
TJ e 25 C VI e 35V
TJ e 25 C
IO e 5 0 mA
23 0
22 8
50
24 0
18
60
12
40
46
170
66
20
28
0 15
21
15
25 0
480
240
480
240
25 2
80
10
05
V
mV
mV
V
mA
mA
mV
dB
V
mX
A
A
mV C
Note 4 All characteristics are measured with a 0 22 mF capacitor from input to ground and a 0 1 mF capacitor from output to ground All characteristics except
noise voltage and ripple rejection ratio are measured using pulse techniques (tw s 10 ms duty cycle s 5%) Output voltage changes due to changes in internal
temperature must be taken into account separately
6

6 Page









LM-340 pdf, datenblatt
Physical Dimensions inches (millimeters)
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TO-3 Metal Can Package (K)
Order Number LM340AK-5 0 LM140K-5 0 LM340K-5 0 LM140K-12 LM340K-12
LM140K-15 LM340K-15 LM7806CK LM7808CK LM7818CK or LM7824CK
NS Package Number K02A
12

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