L7824AB [STMICROELECTRONICS]
PRECISION 1A REGULATORS; 精密1A稳压器
| 型号： | L7824AB |
| 厂家： | 
ST |
| 描述： | PRECISION 1A REGULATORS |
| 文件： | 总17页 (文件大小：110K) |
| 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 1 A
OUTPUT VOLTAGESOF 5; 6; 8; 9; 12; 15; 18;
20; 24V
■
■
■
■
THERMAL OVERLOADPROTECTION
OUTPUT TRANSITION SOA PROTECTION
2% OUTPUT VOLTAGETOLERANCE
GUARANTEED IN EXTENDED
TEMPERATURE RANGE
DESCRIPTION
The L7800A series of three-terminal positive
regulators is available in TO-220 and D2PAK
packages and several fixed output voltages,
D2PAK
making it useful in
a
wide range of
applications.These regulators can provide local
on-card regulation, eliminating the distribution
problems associated with single point regulation.
Each type employs internal current limiting,
thermal shut-down and safe area protection,
making it essentially indestructible. If adequate
heat sinking is provided, they can deliver over 1A
output current. Although designed primarily as
fixed voltage regulators, these devices can be
used with external components to obtain
adjustablevoltages and currents.
TO-220
BLOCK DIAGRAM
1/17
November 1999
L7800AB/AC
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
DC InputVoltage (for VO = 5 to 18V)
(forVO = 20, 24V)
Value
Unit
Vi
35
40
V
V
Io
Output Current
Internally limited
Internally limited
Ptot
Top
Power Dissipation
Operating Junction Temperature Range (for L7800AC)
(for L7800AB)
0 to 150
-40 to 125
oC
oC
Tstg
Storage Temperature Range
- 65 to 150
oC
THERMAL DATA
Symbol
Parameter
D2PAK
TO-220
Unit
Rthj-case Thermal Resistance Junction-case
Rthj-amb Thermal Resistance Junction-ambient
Max
Max
3
62.5
3
50
oC/W
oC/W
CONNECTION DIAGRAM AND ORDERING NUMBERS (top view)
TO-220
D2PAK
Type
L7805AB
TO-220
L7805ABV
D2PAK (*)
L7805ABD2T
Output Voltage
5V
5V
6V
6V
8V
8V
9V
9V
12V
12V
15V
15V
18V
18V
24V
24V
L7805AC
L7806AB
L7806AC
L7808AB
L7808AC
L7809AB
L7809AC
L7812AB
L7812AC
L7815AB
L7815AC
L7818AB
L7818AC
L7820AB
L7820AC
L7824AB
L7824AC
L7805ACV
L7806ABV
L7806ACV
L7808ABV
L7808ACV
L7809ABV
L7809ACV
L7812ABV
L7812ACV
L7815ABV
L7815ACV
L7818ABV
L7818ACV
L7820ABV
L7820ACV
L7824ABV
L7824ACV
L7805ACD2T
L7806ABD2T
L7806ACD2T
L7808ABD2T
L7808ACD2T
L7809ABD2T
L7809ACD2T
L7812ABD2T
L7812ACD2T
L7815ABD2T
L7815ACD2T
(*) AVAILABLE IN TAPE AND REEL WITH ”-TR” SUFFIX
2/17
L7800AB/AC
APPLICATION CIRCUIT
SCHEMATIC DIAGRAM
3/17
L7800AB/AC
TEST CIRCUITS
Figure 1 : DC Parameter
Figure 2 : Load Regulation.
Figure 3 : Ripple Rejection.
4/17
L7800AB/AC
o
ELECTRICAL CHARACTERISTICS FOR L7805A
(Vi = 10V, Io = 1 A, Tj = 0 to 125 C (L7805AC),
Tj = -40 to 125 oC (L7805AB)unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
4.9
Typ.
Max.
5.1
Unit
V
Tj = 25 oC
5
5
Vo
Io = 5 mA to 1 A
Vi = 7.5to 20 V
Po ≤ 15 W
4.8
5.2
V
∆Vo* LineRegulation
∆Vo* Load Regulation
Vi = 7.5to 25 V Io = 500 mA
Vi = 8 to 12 V
7
10
2
50
5
25
50
mV
mV
mV
mV
Vi = 8 to 12 V
Tj = 25 oC
Vi = 7.3to 20 V Tj = 25 oC
7
Io = 5 mA to 1 A
25
30
8
100
100
50
mV
mV
mV
Io = 5 mA to 1.5 A Tj = 25 oC
Io = 250 to 750 mA
Id
Quiescent Current
Tj = 25 oC
4.3
6
6
mA
I
Quiescent Current Change
Vi = 8 to 25 V
Vi = 7.5to 20 V
Io = 5 mA to 1 A
Io = 500 mA
Tj = 25 oC
0.8
0.8
0.5
mA
mA
mA
∆
d
SVR Supply Voltage Rejection
Vi = 8 to 18 V
Io = 500 mA
f = 120Hz
68
dB
Vd
eN
Ro
Isc
Iscp
V
Dropout Voltage
Io = 1 A
Tj = 25 oC
2
V
µV/Vo
mΩ
A
Output Noise Voltage
Output Resistance
B = 10Hz to 100KHz
f = 1KHz
Tj = 25 oC
10
17
Short Circuit Current
Short Circuit Peack Current
Output Voltage Drift
Vi = 35 V Tamb = 25 oC
Tj = 25 oC
0.2
2.2
-1.1
A
mV/oC
∆
o
∆T
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
5/17
L7800AB/AC
o
ELECTRICAL CHARACTERISTICS FOR L7806A
(Vi = 11V, Io = 1 A, Tj = 0 to 125 C (L7806AC),
Tj = -40 to 125 oC (L7806AB)unless otherwise specified)
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
5.88
5.76
Typ.
Max.
6.12
6.24
Unit
V
Vo
Tj = 25 oC
6
6
Vo
Io = 5 mA to 1 A
Vi = 8.6to 21 V
Po 15 W
V
≤
V * LineRegulation
o
Vi = 8.6to 25 V Io = 500 mA
Vi = 9 to 13 V
9
11
3
60
60
30
60
mV
mV
mV
mV
∆
Vi = 9 to 13 V
Tj = 25 oC
Vi = 8.3to 21 V Tj = 25 oC
9
∆Vo* Load Regulation
Io = 5 mA to 1 A
25
30
10
100
100
50
mV
mV
mV
Io = 5 mA to 1.5 A Tj = 25 oC
Io = 250 to 750 mA
Id
Quiescent Current
Tj = 25 oC
4.3
6
6
mA
I
Quiescent Current Change
Vi = 9 to 25 V
Vi = 8.6to 21 V
Io = 5 mA to 1 A
Io = 500 mA
Tj = 25 oC
0.8
0.8
0.5
mA
mA
mA
∆
d
SVR Supply Voltage Rejection
Vi = 9 to 19 V
Io = 500 mA
f = 120Hz
65
dB
Vd
eN
Ro
Isc
Iscp
V
Dropout Voltage
Io = 1 A
Tj = 25 oC
2
V
Output Noise Voltage
Output Resistance
B = 10Hz to 100KHz
Tj = 25 oC
10
V/V
µ
o
f = 1KHz
17
m
Ω
Short Circuit Current
Short Circuit Peack Current
Output Voltage Drift
Vi = 35 V Tamb = 25 oC
Tj = 25 oC
0.2
2.2
-0.8
A
A
mV/oC
∆
o
∆T
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
6/17
L7800AB/AC
o
ELECTRICAL CHARACTERISTICS FOR L7808A
(Vi = 14V, Io = 1 A, Tj = 0 to 125 C (L7808AC),
Tj = -40 to 125 oC (L7808AB)unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
7.84
7.7
Typ.
Max.
8.16
8.3
Unit
V
Tj = 25 oC
8
8
Vo
Io = 5 mA to 1 A
Vi = 10.6to 23 V
Po 15 W
V
≤
V * LineRegulation
o
Vi = 10.6to 25 V Io = 500 mA
Vi = 11 to 17 V
12
15
5
80
80
40
80
mV
mV
mV
mV
∆
Vi = 11 to 17 V
Tj = 25 oC
Vi = 10.4to 23 V Tj = 25 oC
12
∆Vo* Load Regulation
Io = 5 mA to 1 A
25
30
10
100
100
50
mV
mV
mV
Io = 5 mA to 1.5 A Tj = 25 oC
Io = 250 to 750 mA
Id
Quiescent Current
Tj = 25 oC
4.3
6
6
mA
I
Quiescent Current Change
Vi = 11 to 25 V
Vi = 10.6to 23 V
Io = 5 mA to 1 A
Io = 500 mA
Tj = 25 oC
0.8
0.8
0.5
mA
mA
mA
∆
d
SVR Supply Voltage Rejection
Vi = 11.5to 21.5 V
Io = 500 mA
f = 120 Hz
62
dB
Vd
eN
Ro
Isc
Iscp
V
Dropout Voltage
Io = 1 A
Tj = 25 oC
2
V
Output Noise Voltage
Output Resistance
B = 10Hz to 100KHz
Tj = 25 oC
10
V/V
µ
o
f = 1KHz
18
m
Ω
Short Circuit Current
Short Circuit Peack Current
Output Voltage Drift
Vi = 35 V Tamb = 25 oC
Tj = 25 oC
0.2
2.2
-0.8
A
A
mV/oC
∆
o
∆T
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
7/17
L7800AB/AC
o
ELECTRICAL CHARACTERISTICS FOR L7809A
(Vi = 15V, Io = 1 A, Tj = 0 to 125 C (L7809AC),
Tj = -40 to 125 oC (L7809AB)unless otherwise specified)
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
8.82
8.65
Typ.
Max.
9.18
9.35
Unit
V
Vo
Tj = 25 oC
9
9
Vo
Io = 5 mA to 1 A
Vi = 10.6to 23 V
Po 15 W
V
≤
V * LineRegulation
o
Vi = 10.6to 25 V Io = 500 mA
Vi = 11 to 17 V
12
15
5
90
90
45
90
mV
mV
mV
mV
∆
Vi = 11 to 17 V
Tj = 25 oC
Vi = 10.4to 23 V Tj = 25 oC
12
∆Vo* Load Regulation
Io = 5 mA to 1 A
25
30
10
100
100
50
mV
mV
mV
Io = 5 mA to 1.5 A Tj = 25 oC
Io = 250 to 750 mA
Id
Quiescent Current
Tj = 25 oC
4.3
6
6
mA
I
Quiescent Current Change
Vi = 11 to 25 V
Vi = 10.6to 23 V
Io = 5 mA to 1 A
Io = 500 mA
Tj = 25 oC
0.8
0.8
0.5
mA
mA
mA
∆
d
SVR Supply Voltage Rejection
Vi = 11.5to 21.5 V
Io = 500 mA
f = 120 Hz
61
dB
Vd
eN
Ro
Isc
Iscp
V
Dropout Voltage
Io = 1 A
Tj = 25 oC
2
V
Output Noise Voltage
Output Resistance
B = 10Hz to 100KHz
Tj = 25 oC
10
V/V
µ
o
f = 1KHz
18
m
Ω
Short Circuit Current
Short Circuit Peack Current
Output Voltage Drift
Vi = 35 V Tamb = 25 oC
Tj = 25 oC
0.2
2.2
-0.8
A
A
mV/oC
∆
o
∆T
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
8/17
L7800AB/AC
o
ELECTRICAL CHARACTERISTICS FOR L7812A
(Vi = 19V, Io = 1 A, Tj = 0 to 125 C (L7812AC),
Tj = -40 to 125 oC (L7812AB)unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
11.75
11.5
Typ.
12
Max.
12.25
12.5
Unit
V
Tj = 25 oC
Vo
Io = 5 mA to 1 A
Vi = 14.8to 27 V
Po 15 W
12
V
≤
V * LineRegulation
o
Vi = 14.8to 30 V Io = 500 mA
Vi = 16 to 22 V
13
16
6
120
120
60
mV
mV
mV
mV
∆
Vi = 16 to 22 V
Tj = 25 oC
Vi = 14.5to 27 V Tj = 25 oC
13
120
∆Vo* Load Regulation
Io = 5 mA to 1 A
25
30
10
100
100
50
mV
mV
mV
Io = 5 mA to 1.5 A Tj = 25 oC
Io = 250 to 750 mA
Id
Quiescent Current
Tj = 25 oC
4.4
6
6
mA
I
Quiescent Current Change
Vi = 15 to 30 V
Vi = 14.8to 27 V
Io = 5 mA to 1 A
Io = 500 mA
Tj = 25 oC
0.8
0.8
0.5
mA
mA
mA
∆
d
SVR Supply Voltage Rejection
Vi = 15 to 25 V
Io = 500 mA
f = 120 Hz
60
dB
Vd
eN
Ro
Isc
Iscp
V
Dropout Voltage
Io = 1 A
Tj = 25 oC
2
V
Output Noise Voltage
Output Resistance
B = 10Hz to 100KHz
Tj = 25 oC
10
18
0.2
2.2
-1
V/V
µ
o
f = 1KHz
m
Ω
Short Circuit Current
Short Circuit Peack Current
Output Voltage Drift
Vi = 35 V Tamb = 25 oC
Tj = 25 oC
A
A
mV/oC
∆
o
∆T
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
9/17
L7800AB/AC
o
ELECTRICAL CHARACTERISTICS FOR L7815A
(Vi = 23V, Io = 1 A, Tj = 0 to 125 C (L7815AC),
Tj = -40 to 125 oC (L7815AB)unless otherwise specified)
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
14.7
14.4
Typ.
15
Max.
15.3
15.6
Unit
V
Vo
Tj = 25 oC
Vo
Io = 5 mA to 1 A
Vi = 17.9to 30 V
Po 15 W
15
V
≤
V * LineRegulation
o
Vi = 17.9to 30 V Io = 500 mA
Vi = 20 to 26 V
13
16
6
150
150
75
mV
mV
mV
mV
∆
Vi = 20 to 26 V
Tj = 25 oC
Vi = 17.5to 30 V Tj = 25 oC
13
150
∆Vo* Load Regulation
Io = 5 mA to 1 A
25
30
10
100
100
50
mV
mV
mV
Io = 5 mA to 1.5 A Tj = 25 oC
Io = 250 to 750 mA
Id
Quiescent Current
Tj = 25 oC
4.4
6
6
mA
I
Quiescent Current Change
Vi = 17.5to 30 V
Vi = 17.5to 30 V
Io = 5 mA to 1 A
Io = 500 mA
Tj = 25 oC
0.8
0.8
0.5
mA
mA
mA
∆
d
SVR Supply Voltage Rejection
Vi = 18.5to 28.5 V
Io = 500 mA
f = 120 Hz
Tj = 25 oC
58
dB
Vd
eN
Ro
Isc
Iscp
V
Dropout Voltage
Io = 1 A
Tj = 25 oC
2
V
Output Noise Voltage
Output Resistance
B = 10Hz to 100KHz
10
19
0.2
2.2
-1
V/V
µ
o
f = 1KHz
m
Ω
Short Circuit Current
Short Circuit Peack Current
Output Voltage Drift
Vi = 35 V Tamb = 25 oC
Tj = 25 oC
A
A
mV/oC
∆
o
∆T
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
10/17
L7800AB/AC
o
ELECTRICAL CHARACTERISTICS FOR L7818A
(Vi = 27V, Io = 1 A, Tj = 0 to 125 C (L7818AC),
Tj = -40 to 125 oC (L7818AB)unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
17.64
17.3
Typ.
18
Max.
18.36
18.7
Unit
V
Tj = 25 oC
Vo
Io = 5 mA to 1 A
Vi = 21 to 33 V
Po 15 W
18
V
≤
V * LineRegulation
o
Vi = 21 to 33 V Io = 500 mA
Vi = 24 to 30 V
25
28
10
5
180
180
90
mV
mV
mV
mV
∆
Vi = 24 to 30 V
Tj = 25 oC
Vi = 20.6to 33 V Tj = 25 oC
180
∆Vo* Load Regulation
Io = 5 mA to 1 A
25
30
10
100
100
50
mV
mV
mV
Io = 5 mA to 1.5 A Tj = 25 oC
Io = 250 to 750 mA
Id
Quiescent Current
Tj = 25 oC
4.5
6
6
mA
I
Quiescent Current Change
Vi = 21 to 33 V
Vi = 21 to 33 V
Io = 5 mA to 1 A
Io = 500 mA
Tj = 25 oC
0.8
0.8
0.5
mA
mA
mA
∆
d
SVR Supply Voltage Rejection
Vi = 22 to 32 V
Io = 500 mA
f = 120 Hz
57
dB
Vd
eN
Ro
Isc
Iscp
V
Dropout Voltage
Io = 1 A
Tj = 25 oC
2
V
Output Noise Voltage
Output Resistance
B = 10Hz to 100KHz
Tj = 25 oC
10
19
0.2
2.2
-1
V/V
µ
o
f = 1KHz
m
Ω
Short Circuit Current
Short Circuit Peack Current
Output Voltage Drift
Vi = 35 V Tamb = 25 oC
Tj = 25 oC
A
A
mV/oC
∆
o
∆T
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
11/17
L7800AB/AC
o
ELECTRICAL CHARACTERISTICS FOR L7820A
(Vi = 28V, Io = 1 A, Tj = 0 to 125 C (L7820AC),
Tj = -40 to 125 oC (L7820AB)unless otherwise specified)
Symbol
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
19.6
19.2
Typ.
20
Max.
20.4
20.8
Unit
V
Vo
Tj = 25 oC
Vo
Io = 5 mA to 1 A
Vi = 23 to 35 V
Po 15 W
20
V
≤
V * LineRegulation
o
Vi = 23 to 35 V Io = 500 mA
Vi = 26 to 32 V
Vi = 26 to 32 V
200
200
100
200
mV
mV
mV
mV
∆
Tj = 25 oC
Tj = 25 oC
Vi = 23 to 32 V
∆Vo* Load Regulation
Io = 5 mA to 1 A
25
30
10
100
100
50
mV
mV
mV
Io = 5 mA to 1.5 A Tj = 25 oC
Io = 250 to 750 mA
Id
Quiescent Current
Tj = 25 oC
4.5
6
6
mA
I
Quiescent Current Change
Vi = 23 to 35 V
Vi = 23 to 35 V
Io = 5 mA to 1 A
Io = 500 mA
Tj = 25 oC
0.8
0.8
0.5
mA
mA
mA
∆
d
SVR Supply Voltage Rejection
Vi = 24 to 35 V
Io = 500 mA
f = 120 Hz
56
dB
Vd
eN
Ro
Isc
Iscp
V
Dropout Voltage
Io = 1 A
Tj = 25 oC
2
V
Output Noise Voltage
Output Resistance
B = 10Hz to 100KHz
Tj = 25 oC
10
20
0.2
2.2
-1
V/V
µ
o
f = 1KHz
m
Ω
Short Circuit Current
Short Circuit Peack Current
Output Voltage Drift
Vi = 35 V Tamb = 25 oC
Tj = 25 oC
A
A
mV/oC
∆
o
∆T
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
12/17
L7800AB/AC
o
ELECTRICAL CHARACTERISTICS FOR L7824A
(Vi = 33V, Io = 1 A, Tj = 0 to 125 C (L7824AC),
Tj = -40 to 125 oC (L7824AB)unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Output Voltage
Test Conditions
Min.
23.5
23
Typ.
24
Max.
24.5
25
Unit
V
Tj = 25 oC
Vo
Io = 5 mA to 1 A
Vi = 27.3to 38 V
Po 15 W
24
V
≤
V * LineRegulation
o
Vi = 27 to 38 V Io = 500 mA
Vi = 30 to 36 V
31
35
14
31
240
240
120
240
mV
mV
mV
mV
∆
Vi = 30 to 36 V
Tj = 25 oC
Vi = 26.7to 38 V Tj = 25 oC
∆Vo* Load Regulation
Io = 5 mA to 1 A
25
30
10
100
100
50
mV
mV
mV
Io = 5 mA to 1.5 A Tj = 25 oC
Io = 250 to 750 mA
Id
Quiescent Current
Tj = 25 oC
4.6
6
6
mA
I
Quiescent Current Change
Vi = 27.3to 38 V
Vi = 27.3to 38 V
Io = 5 mA to 1 A
Io = 500 mA
Tj = 25 oC
0.8
0.8
0.5
mA
mA
mA
∆
d
SVR Supply Voltage Rejection
Vi = 28 to 38 V
Io = 500 mA
f = 120 Hz
54
dB
Vd
eN
Ro
Isc
Iscp
V
Dropout Voltage
Io = 1 A
Tj = 25 oC
2
V
Output Noise Voltage
Output Resistance
B = 10Hz to 100KHz
Tj = 25 oC
10
V/V
µ
o
f = 1KHz
20
m
Ω
Short Circuit Current
Short Circuit Peack Current
Output Voltage Drift
Vi = 35 V Tamb = 25 oC
Tj = 25 oC
0.2
2.2
-1.5
A
A
mV/oC
∆
o
∆T
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
13/17
L7800AB/AC
APPLICATIONS INFORMATION
DESIGN CONSIDERATIONS
connected to the power supply filter with long
wire 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 0.33µF 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 regulatorhas no external sense lead.
The L7800ASeries of fixed voltage regulatorsare
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 a capacitor if the regulator is
Figure 4 :
Figure 5 :
Adjustable Output Regulator.
Current Regulator.
VO, 7.0V to 20V
Vi – VO ≥ 2.0V
V XX
R 1
The addition of an operational amplifier allows
adjustment to higher or intermediate values while
retaining regulation characteristics. The minimum
voltage obtainable with this arrangement is 2.0V
greaterthan the regulator voltage.
IO
=
+ I d
Figure 6 : Current Boost Regulator.
Figure 7 : Short-circuit Protection.
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
V BEQ1
R1 =
I Q1
I REQ
−
β Q1
IO = I REG + Q 1 (I REG
V BEQ1
R 1
−
)
three-terminal
regulator.
Therefore,
a
four-ampere plastic power transistor is specified.
14/17
L7800AB/AC
TO-220 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
4.40
1.23
2.40
TYP.
MAX.
4.60
1.32
2.72
MIN.
0.173
0.048
0.094
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
L2
Dia.
L5
L9
L7
L6
L4
P011C
15/17
L7800AB/AC
2
TO-263 (D PAK) MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
4.4
TYP.
MAX.
4.6
MIN.
0.173
0.098
0.027
0.044
0.017
0.048
0.352
0.393
0.192
0.590
0.050
0.055
MAX.
0.181
0.106
0.036
0.067
0.023
0.053
0.368
0.409
0.208
0.624
0.055
0.068
A
A1
B
2.49
0.7
2.69
0.93
1.7
B2
C
1.14
0.45
1.23
8.95
10
0.6
C2
D
1.36
9.35
10.4
5.28
15.85
1.4
E
G
4.88
15
L
L2
L3
1.27
1.4
1.75
D
A
C
C2
DETAIL”A”
DETAIL”A”
A1
B
B2
E
G
L3
L2
L
P011P6/F
16/17
L7800AB/AC
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of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. Thispublication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in lifesupport devices or systems withoutexpress written approval of STMicroelectronics.
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17/17
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