L7818ABD2TR [STMICROELECTRONICS]
18V FIXED POSITIVE REGULATOR, PSSO2, D2PAK-3;
| 型号： | L7818ABD2TR |
| 厂家： | 
ST |
| 描述： | 18V FIXED POSITIVE REGULATOR, PSSO2, D2PAK-3 输出元件 调节器 |
| 文件： | 总18页 (文件大小：116K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L7800AB/AC
SERIES
PRECISION 1A REGULATORS
■
■
OUTPUT CURRENT IN EXCESS OF 1A
OUTPUT VOLTAGES OF 5; 6; 8; 9; 12; 15;
18; 20; 24V
■
■
■
■
THERMAL OVERLOAD PROTECTION
OUTPUT TRANSITION SOA PROTECTION
2% OUTPUT VOLTAGE TOLERANCE
GUARANTEED IN EXTENDED
TEMPERATURE RANGE
TO-220
TO-220FP
DESCRIPTION
The L7800A series of three terminal positive
regulators is available in TO-220, TO-220FP and
2
D PAK packages and several fixed output
2
voltages, making it useful in a wide range of
applications. These regulators can provide local
on-card regulation, eliminating the distribution
problem associated with single point regulation.
Each type employs internal current limiting,
thermal shut-down and safe area protection,
making it essentially indestructible. If adeguate
heat sinking is provided, they can deliver over 1A
D PAK
output current, Although designed primarily as
fixed voltage regulators, these devices can be
used with external components to obtain
adjustable voltage and currents.
SCHEMATIC DIAGRAM
October 2001
1/18
L7800AB/AC SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
DC Input Voltage (for V = 5 to 18V)
35
40
V
V
O
V
I
I
(for V = 20, 24V)
O
Output Current
Internally Limited
Internally Limited
-65 to +150
mA
mW
°C
O
P
Power Dissipation
D
T
Storage Temperature Range
stg
Operating Junction Temperature Range (for L7800AC)
(for L7800AB)
0 to +150
-40 to +125
°C
°C
T
op
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
2
Symbol
Parameter
TO-220
TO-220FP
Unit
D PAK
R
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
3
5
3
°C/W
°C/W
thj-case
R
50
60
62.5
thj-amb
SHEMATIC DIAGRAM
2/18
L7800AB/AC SERIES
CONNECTION DIAGRAM (top view)
TO-220
TO-220FP
2
D PAK
ORDERING CODES
2
TYPE
TO-220
TO-220FP
OUTPUT VOLTAGE
D PAK (*)
L7805AB
L7805AC
L7806AB
L7806AC
L7808AB
L7808AC
L7809AB
L7809AC
L7812AB
L7812AC
L7815AB
L7815AC
L7818AB
L7818AC
L7820AB
L7820AC
L7824AB
L7824AC
L7805ABV
L7805ACV
L7806ABV
L7806ACV
L7808ABV
L7808ACV
L7809ABV
L7809ACV
L7812ABV
L7812ACV
L7815ABV
L7815ACV
L7818ABV
L7818ACV
L7820ABV
L7820ACV
L7824ABV
L7824ACV
L7805ABP
L7805ACP
L7806ABP
L7806ACP
L7808ABP
L7808ACP
L7809ABP
L7809ACP
L7812ABP
L7812ACP
L7815ABP
L7815ACP
L7818ABP
L7818ACP
L7820ABP
L7820ACP
L7824ABP
L7824ACP
L7805ABD2T
L7805ACD2T
L7806ABD2T
L7806ACD2T
L7808ABD2T
L7808ACD2T
L7809ABD2T
L7809ACD2T
L7812ABD2T
L7812ACD2T
L7815ABD2T
L7815ACD2T
L7818ABD2T
L7818ACD2T
L7820ABD2T
L7820ACD2T
L7824ABD2T
L7824ACD2T
5 V
5 V
6 V
6 V
8 V
8 V
9 V
9 V
12 V
12 V
15 V
15 V
18 V
18 V
20 V
20 V
24 V
24 V
(*) Available in Tape & Reel with the suffix ”R” for fixed version and ”-R” for adjustable version.
APPLICATION CIRCUITS
3/18
L7800AB/AC SERIES
TEST CIRCUITS
Figure 1 : DC Parameter
Figure 2 : Load Regulation
Figure 3 : Ripple Rejection
4/18
L7800AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L7805A (V =10V, I =1A, T = 0 to 150°C (L7805AC),
I
O
J
T = -40 to 125°C (L7805AB), unless otherwise specified.)
J
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
4.9
Typ.
Max.
5.1
Unit
V
V
V
T
= 25°C
J
5
5
O
O
I
= 5mA to 1A
P
≤ 15W
O
4.8
5.2
V
O
V = 7.5 to 20V
I
∆V (*) Line Regulation
V = 7.5 to 25V
I = 500 mA
O
7
10
2
50
50
25
50
100
100
50
6
mV
mV
mV
mV
mV
V
O
I
V = 8 to 12V
I
V = 8 to 12V
T = 25°C
J
I
V = 7.3 to 20V
T = 25°C
7
I
J
∆V (*) Load Regulation
I
I
I
= 5mA to 1A
25
30
8
O
O
O
O
= 5mA to 1.5A T = 25°C
J
= 250 to 750mA
V
I
Quiescent Current
T
= 25°C
J
4.3
mA
q
6
mA
mA
∆I
Quiescent Current Change V = 8 to 25V
I = 500 mA
O
0.8
q
I
V = 7.5 to 20V
T = 25°C
0.8
0.5
mA
mA
dB
I
J
I
= 5mA to 1A
O
SVR
Supply Voltage Rejection
V = 8 to 18V
f = 120Hz
68
I
I
= 500mA
O
O
V
Dropout Voltage
I
= 1A
T = 25°C
2
V
d
J
eN
Output Noise Voltage
Output Resistance
T
= 25°C
B =10Hz to 100KHz
10
µV/V
mΩ
A
A
O
R
f =1KHz
V = 35V
17
O
I
Short Circuit Current
Short Circuit Peak Current
T = 25°C
A
0.2
2.2
-1.1
sc
I
I
T
= 25°C
J
A
scp
∆V /∆T Output Voltage Drift
mv/°C
O
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account
O
separately. Pulse testing with low duty cycle is used.
5/18
L7800AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L7806A (V =11V, I =1A, T = 0 to 150°C (L7806AC),
I
O
J
T = -40 to 125°C (L7806AB), unless otherwise specified.)
J
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
5.88
5.76
Typ.
Max.
6.12
6.24
Unit
V
V
V
T
= 25°C
J
6
6
O
O
I
= 5mA to 1A
P
≤ 15W
O
V
O
V = 8.6 to 21V
I
∆V (*) Line Regulation
V = 8.6 to 25V
I = 500 mA
O
9
11
3
60
60
30
60
100
100
50
6
mV
mV
mV
mV
mV
V
O
I
V = 9 to 13V
I
V = 9 to 13V
T = 25°C
J
I
V = 8.3 to 21V
T = 25°C
9
I
J
∆V (*) Load Regulation
I
I
I
= 5mA to 1A
25
30
10
4.3
O
O
O
O
= 5mA to 1.5A T = 25°C
J
= 250 to 750mA
V
I
Quiescent Current
T
= 25°C
J
mA
q
6
mA
mA
∆I
Quiescent Current Change V = 9 to 25V
I = 500 mA
O
0.8
q
I
V = 8.6 to 21V
T = 25°C
0.8
0.5
mA
mA
dB
I
J
I
= 5mA to 1A
O
SVR
Supply Voltage Rejection
V = 9 to 19V
f = 120Hz
65
I
I
= 500mA
O
O
V
Dropout Voltage
I
= 1A
T = 25°C
2
V
d
J
eN
Output Noise Voltage
Output Resistance
T
= 25°C
B =10Hz to 100KHz
10
µV/V
mΩ
A
A
O
R
f =1KHz
V = 35V
17
O
I
Short Circuit Current
Short Circuit Peak Current
T = 25°C
A
0.2
2.2
-0.8
sc
I
I
T
= 25°C
J
A
scp
∆V /∆T Output Voltage Drift
mV/°C
O
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account
O
separately. Pulse testing with low duty cycle is used.
6/18
L7800AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L7808A (V =14V, I =1A, T = 0 to 150°C (L7808AC),
I
O
J
T = -40 to 125°C (L7808AB), unless otherwise specified.)
J
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
7.84
7.7
Typ.
Max.
8.16
8.3
Unit
V
V
V
T
= 25°C
J
8
8
O
O
I
= 5mA to 1A
P
≤ 15W
O
V
O
V =10.6 to 23V
I
∆V (*) Line Regulation
V = 10.6 to 25V
I = 500 mA
O
12
15
5
80
80
40
80
100
100
50
6
mV
mV
mV
mV
mV
V
O
I
V = 11 to 17V
I
V = 11 to 17V
T = 25°C
J
I
V = 10.4 to 23V
T = 25°C
12
25
30
10
4.3
I
J
∆V (*) Load Regulation
I
I
I
= 5mA to 1A
O
O
O
O
= 5mA to 1.5A T = 25°C
J
= 250 to 750mA
V
I
Quiescent Current
T
= 25°C
J
mA
q
6
mA
mA
∆I
Quiescent Current Change V = 11 to 25V
I = 500 mA
O
0.8
q
I
V = 10.6 to 23V
T = 25°C
0.8
0.5
mA
mA
dB
I
J
I
= 5mA to 1A
O
SVR
Supply Voltage Rejection
V = 11.5 to 21.5V f = 120Hz
62
I
I
= 500mA
O
O
V
Dropout Voltage
I
= 1A
T = 25°C
2
V
d
J
eN
Output Noise Voltage
Output Resistance
T
= 25°C
B =10Hz to 100KHz
10
µV/V
mΩ
A
A
O
R
f =1KHz
V = 35V
18
O
I
Short Circuit Current
Short Circuit Peak Current
T = 25°C
A
0.2
2.2
-0.8
sc
I
I
T
= 25°C
J
A
scp
∆V /∆T Output Voltage Drift
mV/°C
O
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account
O
separately. Pulse testing with low duty cycle is used.
7/18
L7800AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L7809A (V =15V, I =1A, T = 0 to 150°C (L7809AC),
I
O
J
T = -40 to 125°C (L7809AB), unless otherwise specified.)
J
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
8.82
8.65
Typ.
Max.
9.18
9.35
Unit
V
V
V
T
= 25°C
J
9
9
O
O
I
= 5mA to 1A
P
≤ 15W
O
V
O
V =10.6 to 23V
I
∆V (*) Line Regulation
V = 10.6 to 25V
I = 500 mA
O
12
15
5
90
90
45
90
100
100
50
6
mV
mV
mV
mV
mV
V
O
I
V = 11 to 17V
I
V = 11 to 17V
T = 25°C
J
I
V = 10.4 to 23V
T = 25°C
12
25
30
10
4.3
I
J
∆V (*) Load Regulation
I
I
I
= 5mA to 1A
O
O
O
O
= 5mA to 1.5A T = 25°C
J
= 250 to 750mA
V
I
Quiescent Current
T
= 25°C
J
mA
q
6
mA
mA
∆I
Quiescent Current Change V = 11 to 25V
I = 500 mA
O
0.8
q
I
V = 10.6 to 23V
T = 25°C
0.8
0.5
mA
mA
dB
I
J
I
= 5mA to 1A
O
SVR
Supply Voltage Rejection
V = 11.5 to 21.5V f = 120Hz
61
I
I
= 500mA
O
O
V
Dropout Voltage
I
= 1A
T = 25°C
2
V
d
J
eN
Output Noise Voltage
Output Resistance
T
= 25°C
B =10Hz to 100KHz
10
µV/V
mΩ
A
A
O
R
f =1KHz
V = 35V
18
O
I
Short Circuit Current
Short Circuit Peak Current
T = 25°C
A
0.2
2.2
-0.8
sc
I
I
T
= 25°C
J
A
scp
∆V /∆T Output Voltage Drift
mV/°C
O
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account
O
separately. Pulse testing with low duty cycle is used.
8/18
L7800AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L7812A (V =19V, I =1A, T = 0 to 150°C (L7812AC),
I
O
J
T = -40 to 125°C (L7812AB), unless otherwise specified.)
J
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
11.75
11.5
Typ.
12
Max.
12.25
12.5
Unit
V
V
V
T = 25°C
J
O
O
I
= 5mA to 1A
P
≤ 15W
O
12
V
O
V =14.8 to 27V
I
∆V (*) Line Regulation
V = 14.8 to 30V
I = 500 mA
O
13
16
6
120
120
60
mV
mV
mV
mV
mV
V
O
I
V = 16 to 22V
I
V = 16 to 22V
T = 25°C
J
I
V = 14.5 to 27V
T = 25°C
13
25
30
10
4.4
120
100
100
50
I
J
∆V (*) Load Regulation
I
I
I
= 5mA to 1A
O
O
O
O
= 5mA to 1.5A T = 25°C
J
= 250 to 750mA
V
I
Quiescent Current
T
= 25°C
J
6
mA
q
6
mA
mA
∆I
Quiescent Current Change V = 15 to 30V
I = 500 mA
O
0.8
q
I
V = 14.8 to 27V
T = 25°C
0.8
0.5
mA
mA
dB
I
J
I
= 5mA to 1A
O
SVR
Supply Voltage Rejection
V = 15 to 25V
f = 120Hz
60
I
I
= 500mA
O
O
V
Dropout Voltage
I
= 1A
T = 25°C
2
V
d
J
eN
Output Noise Voltage
Output Resistance
T
= 25°C
B =10Hz to 100KHz
10
18
0.2
2.2
-1
µV/V
mΩ
A
A
O
R
f =1KHz
V = 35V
O
I
Short Circuit Current
Short Circuit Peak Current
T = 25°C
A
sc
I
I
T
= 25°C
J
A
scp
∆V /∆T Output Voltage Drift
mV/°C
O
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account
O
separately. Pulse testing with low duty cycle is used.
9/18
L7800AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L7815A (V =23V, I =1A, T = 0 to 150°C (L7815AC),
I
O
J
T = -40 to 125°C (L7815AB), unless otherwise specified.)
J
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
14.7
14.4
Typ.
15
Max.
15.3
15.6
Unit
V
V
V
T = 25°C
J
O
O
I
= 5mA to 1A
P
≤ 15W
O
15
V
O
V = 17.9 to 30V
I
∆V (*) Line Regulation
V = 17.9 to 30V
I = 500 mA
O
13
16
6
150
150
75
mV
mV
mV
mV
mV
V
O
I
V = 20 to 26V
I
V = 20 to 26V
T = 25°C
J
I
V = 17.5 to 30V
T = 25°C
13
25
30
10
4.4
150
100
100
50
I
J
∆V (*) Load Regulation
I
I
I
= 5mA to 1A
O
O
O
O
= 5mA to 1.5A T = 25°C
J
= 250 to 750mA
V
I
Quiescent Current
T
= 25°C
J
6
mA
q
6
mA
mA
∆I
Quiescent Current Change V = 17.5 to 30V
I = 500 mA
O
0.8
q
I
V = 17.5 to 30V
T = 25°C
0.8
0.5
mA
mA
dB
I
J
I
= 5mA to 1A
O
SVR
Supply Voltage Rejection
V = 18.5 to 28.5V f = 120Hz
58
I
I
= 500mA
O
O
V
Dropout Voltage
I
= 1A
T = 25°C
2
V
d
J
eN
Output Noise Voltage
Output Resistance
T
= 25°C
B =10Hz to 100KHz
10
19
0.2
2.2
-1
µV/V
mΩ
A
A
O
R
f =1KHz
V = 35V
O
I
Short Circuit Current
Short Circuit Peak Current
T = 25°C
A
sc
I
I
T
= 25°C
J
A
scp
∆V /∆T Output Voltage Drift
mV/°C
O
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account
O
separately. Pulse testing with low duty cycle is used.
10/18
L7800AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L7818A (V =27V, I =1A, T = 0 to 150°C (L7818AC),
I
O
J
T = -40 to 125°C (L7818AB), unless otherwise specified.)
J
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
17.64
17.3
Typ.
18
Max.
18.36
18.7
Unit
V
V
V
T = 25°C
J
O
O
I
= 5mA to 1A
P
≤ 15W
O
18
V
O
V = 21 to 33V
I
∆V (*) Line Regulation
V = 21 to 33V
I = 500 mA
O
25
28
10
5
180
180
90
mV
mV
mV
mV
mV
V
O
I
V = 24 to 30V
I
V = 24 to 30V
T = 25°C
J
I
V = 20.6 to 33V
T = 25°C
180
100
100
50
I
J
∆V (*) Load Regulation
I
I
I
= 5mA to 1A
25
30
10
4.5
O
O
O
O
= 5mA to 1.5A T = 25°C
J
= 250 to 750mA
V
I
Quiescent Current
T
= 25°C
J
6
mA
q
6
mA
mA
∆I
Quiescent Current Change V = 21 to 33V
I = 500 mA
O
0.8
q
I
V = 21 to 33V
T = 25°C
0.8
0.5
mA
mA
dB
I
J
I
= 5mA to 1A
O
SVR
Supply Voltage Rejection
V = 22 to 32V
f = 120Hz
57
I
I
= 500mA
O
O
V
Dropout Voltage
I
=1 A
T = 25°C
2
V
d
J
eN
Output Noise Voltage
Output Resistance
T
= 25°C
B =10Hz to 100KHz
10
19
0.2
2.2
-1
µV/V
mΩ
A
A
O
R
f =1KHz
V = 35V
O
I
Short Circuit Current
Short Circuit Peak Current
T = 25°C
A
sc
I
I
T
= 25°C
J
A
scp
∆V /∆T Output Voltage Drift
mV/°C
O
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account
O
separately. Pulse testing with low duty cycle is used.
11/18
L7800AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L7820A (V =28V, I =1A, T = 0 to 150°C (L7820AC),
I
O
J
T = -40 to 125°C (L7820AB), unless otherwise specified.)
J
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
19.6
19.2
Typ.
20
Max.
20.4
20.8
Unit
V
V
V
T = 25°C
J
O
O
I
= 5mA to 1A
P
≤ 15W
O
20
V
O
V = 23 to 35V
I
∆V (*) Line Regulation
V = 23 to 35V
I = 500 mA
O
200
200
100
200
100
100
50
mV
mV
mV
mV
mV
V
O
I
V = 26 to 32V
I
V = 26 to 32V
T = 25°C
J
I
V = 23 to 32V
T = 25°C
J
I
∆V (*) Load Regulation
I
I
I
= 5mA to 1A
25
30
10
4.5
O
O
O
O
= 5mA to 1.5A T = 25°C
J
= 250 to 750mA
V
I
Quiescent Current
T
= 25°C
J
6
mA
q
6
mA
mA
∆I
Quiescent Current Change V = 23 to 35V
I = 500 mA
O
0.8
q
I
V = 23 to 35V
T = 25°C
0.8
0.5
mA
mA
dB
I
J
I
= 5mA to 1A
O
SVR
Supply Voltage Rejection
V = 24 to 35V
f = 120Hz
56
I
I
= 500mA
O
O
V
Dropout Voltage
I
=1 A
T = 25°C
2
V
d
J
eN
Output Noise Voltage
Output Resistance
T
= 25°C
B =10Hz to 100KHz
10
20
0.2
2.2
-1
µV/V
mΩ
A
A
O
R
f =1KHz
V = 35V
O
I
Short Circuit Current
Short Circuit Peak Current
T = 25°C
A
sc
I
I
T
= 25°C
J
A
scp
∆V /∆T Output Voltage Drift
mV/°C
O
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account
O
separately. Pulse testing with low duty cycle is used.
12/18
L7800AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L7824A (V =33V, I =1A, T = 0 to 150°C (L7824AC),
I
O
J
T = -40 to 125°C (L7824AB), unless otherwise specified.)
J
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
23.5
23
Typ.
24
Max.
24.5
25
Unit
V
V
V
T = 25°C
J
O
O
I
= 5mA to 1A
P
≤ 15W
O
24
V
O
V = 27.3 to 38V
I
∆V (*) Line Regulation
V = 27 to 38V
I = 500 mA
O
31
35
14
31
25
30
10
4.6
240
240
120
240
100
100
50
mV
mV
mV
mV
mV
V
O
I
V = 30 to 36V
I
V = 30 to 36V
T = 25°C
J
I
V = 26.7 to 38V
T = 25°C
J
I
∆V (*) Load Regulation
I
I
I
= 5mA to 1A
O
O
O
O
= 5mA to 1.5A T = 25°C
J
= 250 to 750mA
V
I
Quiescent Current
T
= 25°C
J
6
mA
q
6
mA
mA
∆I
Quiescent Current Change V = 27.3 to 38V
I = 500 mA
O
0.8
q
I
V = 27.3 to 38V
T = 25°C
0.8
0.5
mA
mA
dB
I
J
I
= 5mA to 1A
O
SVR
Supply Voltage Rejection
V = 28 to 38V
f = 120Hz
54
I
I
= 500mA
O
O
V
Dropout Voltage
I
=1 A
T = 25°C
2
V
d
J
eN
Output Noise Voltage
Output Resistance
T
= 25°C
B =10Hz to 100KHz
10
µV/V
mΩ
A
A
O
R
f =1KHz
V = 35V
20
O
I
Short Circuit Current
Short Circuit Peak Current
T = 25°C
A
0.2
2.2
-1.5
sc
I
I
T
= 25°C
J
A
scp
∆V /∆T Output Voltage Drift
mV/°C
O
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account
O
separately. Pulse testing with low duty cycle is used.
13/18
L7800AB/AC SERIES
APPLICATION INFORMATION
DESIGN CONSIDERATION
Figure 5 : DC Parameter
The L7800A Series of fixed voltage regulators are
designed with Thermal Overload Protection that
shuts down the circuit when subjected to an
excessive power overload condition, Internal
Short-circuit Protection that limits the maximum
current the circuit will pass, and Output transistor
Safe-Area Compensation that reduces the output
short-circuit current as the voltage across the pass
transistor is increased. In many low current
applications, compensation capacitors are not
required. However, it is recommended that the
regulator input be bypassed with capacitor if the
regulator is connected to the power supply filter
with long lengths, or if the output load capacitance
is large. An input bypass capacitor should be
selected to provide good high frequency
characteristics to insure stable operation under all
load conditions. A 0.33mF or larger tantalum,
mylar or other capacitor having low internal
impedance at high frequencies should be chosen.
The bypass capacitor should be mounted with the
shortest possible leads directly across the
regulators input terminals. Normally good
construction techniques should be used to
minimize ground loops and lead resistance drops
since the regulator has no external sense lead.
The addition of an operational amplifier allows
adjustment to higher or intermediate values while
retaining regulation characteristics. The minimum
voltage obtained with the arrangement is 2V
greater than the regulator voltage.
V , 7.0 to 20V
O
V - V ≥ 2.0V
I
O
Figure 6 : DC Parameter
V
BEQ1
R
=
1
I
β
Q1
I
-
REQ
Q1
V
BEQ1
R
1
I
= I
REG
+ Q (I
REG
)
O
1
The circuit of figure 6 can be modified to provide
supply protection against short circuit by adding a
short circuit sense resistor, RSC, and an
additional PNP transistor. The current sensing
PNP must be able to handle the short circuit
current of the three terminal regulator Therefore a
four ampere plastic power transistor is specified.
Figure 7 : DC Parameter
Figure 4 : DC Parameter
V
R
xx
I
=
+ I
d
O
1
14/18
L7800AB/AC SERIES
TO-220 MECHANICAL DATA
mm.
inch
DIM.
MIN.
4.40
1.23
2.40
TYP
MAX.
4.60
1.32
2.72
MIN.
0.173
0.048
0.094
TYP.
MAX.
0.181
0.051
0.107
A
C
D
D1
E
1.27
0.050
0.49
0.61
1.14
1.14
4.95
2.4
0.70
0.88
1.70
1.70
5.15
2.7
0.019
0.024
0.044
0.044
0.194
0.094
0.393
0.027
0.034
0.067
0.067
0.203
0.106
0.409
F
F1
F2
G
G1
H2
L2
L4
L5
L6
L7
L9
DIA.
10.0
10.40
16.4
0.645
13.0
2.65
15.25
6.2
14.0
2.95
15.75
6.6
0.511
0.104
0.600
0.244
0.137
0.147
0.551
0.116
0.620
0.260
0.154
0.151
3.5
3.93
3.85
3.75
P011C
15/18
L7800AB/AC SERIES
TO-220FP MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
4.60
2.7
MIN.
0.173
0.098
0.098
0.017
0.030
0.045
0.045
0.194
0.094
0.393
TYP.
MAX.
0.181
0.106
0.108
0.027
0.039
0.067
0.067
0.204
0.106
0.409
A
B
4.40
2.5
D
2.5
2.75
0.70
1
E
0.45
0.75
1.15
1.15
4.95
2.4
F
F1
F2
G
1.70
1.70
5.2
G1
H
2.7
10.0
10.40
L2
L3
L4
L6
L7
DIA.
16
0.630
28.6
9.8
15.9
9
30.6
10.6
16.4
9.3
1.126
0.385
0.626
0.354
0.118
1.204
0.417
0.645
0.366
0.126
3
3.2
L3
L6
L7
¯
1 2 3
L4
L2
16/18
L7800AB/AC SERIES
2
D PAK MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
A1
A2
B
4.4
2.49
0.03
0.7
4.6
2.69
0.23
0.93
1.7
0.173
0.098
0.001
0.027
0.044
0.017
0.048
0.352
0.181
0.106
0.009
0.036
0.067
0.023
0.053
0.368
B2
C
1.14
0.45
1.23
8.95
0.6
C2
D
1.36
9.35
D1
E
8
0.315
0.335
10
10.4
0.393
0.409
E1
G
8.5
4.88
15
5.28
15.85
1.4
0.192
0.590
0.050
0.055
0.094
0.208
0.624
0.055
0.068
0.126
L
L2
L3
M
1.27
1.4
1.75
3.2
2.4
R
0.4
0.016
V2
0°
8°
0°
8°
P011P6G
17/18
L7800AB/AC SERIES
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use ofsuch information nor for any infringement of patents orother rights of third parties which mayresult from
its use. No license is granted by implication or otherwise under any patent orpatent rights of STMicroelectronics.Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
TheST logo is a registered trademark of STMicroelectronics
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18/18
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