L78S12T [STMICROELECTRONICS]
2A POSITIVE VOLTAGE REGULATORS; 2A正电压调节器
| 型号： | L78S12T |
| 厂家： | 
ST |
| 描述： | 2A POSITIVE VOLTAGE REGULATORS |
| 文件： | 总21页 (文件大小：263K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L78S00
SERIES
2A POSITIVE VOLTAGE REGULATORS
.
.
OUTPUT CURRENT TO 2A
OUTPUT VOLTAGES OF5 ; 7.5; 9; 10; 12; 15 ;
18 ; 24V
THERMAL OVERLOAD PROTECTION
SHORT CIRCUIT PROTECTION
OUTPUT TRANSISTOR SOA PROTECTION
.
.
.
DESCRIPTION
TO-3
The L78S00 series of three-terminal positive regu-
lators is available in TO-220 and TO-3 packages
and with several fixed output voltages, making it
useful in a wide range of applications. These regu-
lators can provide local on-card regulation, eliminat-
ing the distribution problems associated with single
point regulation. Each type employs internal current
limiting, thermal shut-down and safe area protec-
tion, making it essentially indestructible. Ifadequate
heat sinking is provided, they can deliver over 2A
output current. Although designed primarily as fixed
voltage regulators, these devices can be used with
external components to obtain adjustable voltages
and currents.
TO-220
BLOCK DIAGRAM
January 1993
1/21
L78S00 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
Vi
DC Input Voltage (for Vo = 5 to 18V)
(for Vo = 24V)
35
40
V
V
Io
Output Current
Internally limited
Internally limited
– 65 to + 150
Pt ot
Tstg
To p
Power Dissipation
Storage Temperature
°C
Operating Junction Temperature (for L78S00)
(for L78S00C)
– 55 to + 150
0 to + 150
°C
°C
THERMAL DATA
TO-220
TO-3
Rt h j-case Thermal Resistance Junction-case
Rth j-amb Thermal Resistance Junction-ambient
Max
Max
3
50
4
35
°C/W
°C/W
CONNECTION DIAGRAMS AND ORDERING NUMBERS (top views)
Type
TO-220
TO-3
Output Voltage
L78S05
L78S05C
L78S75
L78S75C
L78S09
L78S09C
L78S10
L78S10C
L78S12
L78S12C
L78S15
L78S15C
L78S18
L78S18C
L78S24
L78S05T
L78S05CT
L78S75T
L78S75CT
L78S09T
L78S09CT
L78S10T
L78S10CT
L78S12T
L78S12CT
L78S15T
L78S15CT
L78S18T
L78S18CT
L78S24T
L78S24CT
5V
5V
7.5V
7.5V
9V
L78S05CV
L78S75CV
L78S09CV
L78S10CV
L78S12CV
L78S15CV
L78S18CV
L78S24CV
9V
10V
10V
12V
12V
15V
15V
18V
18V
24V
24V
L78S24C
2/21
L78S00 SERIES
APPLICATION CIRCUIT
SCHEMATIC DIAGRAM
3/21
L78S00 SERIES
TEST CIRCUITS
Figure 1 : DC Parameters.
Figure 2 : Load Regulation.
Figure 3 : Ripple Rejection.
4/21
L78S00 SERIES
ELECTRICAL CHARACTERISTICS FOR L78S05 (refer to the test circuits, Tj = 25 oC,
Vi = 10V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
4.8
Typ.
Max.
5.2
Unit
V
5
5
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 7 V
4.75
5.25
V
∆Vo
Vi = 7 to 25 V
Vi = 8 to 25 V
100
50
mV
mV
∆Vo
Id
Load Regulation
Io = 20 mA to 2 A
100
8
mV
mA
Quiescent Current
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1.3
mA
Io = 20 mA Vi = 7 to 25 V
mA
mV/oC
∆Vo
∆T
Io = 5 mA
Tj = -55 to 150 oC
-1.1
40
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
µV
dB
V
60
8
Io ≤ 1.5 A
Ro
f = 1KHz
17
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
ELECTRICAL CHARACTERISTICS FOR L78S75 (refer to the test circuits, Tj = 25 oC,
Vi = 12.5V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
7.15
7.1
Typ.
7.5
Max.
7.9
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 9.5 V
7.5
7.95
V
∆Vo
Vi = 9.5 to 25 V
Vi = 10.5 to 20 V
120
60
mV
mV
∆Vo
Id
Load Regulation
Io = 20 mA to 2 A
120
8
mV
mA
Quiescent Current
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1.3
mA
Io = 20 mA Vi = 9.5 to 25 V
mA
mV/oC
∆Vo
∆T
Io = 5 mA
Tj = -55 to 150 oC
-0.8
52
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
µV
dB
V
54
Io ≤ 1.5 A
10.5
Ro
f = 1KHz
16
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
5/21
L78S00 SERIES
ELECTRICAL CHARACTERISTICS FOR L78S09 (refer to the test circuits, Tj = 25 oC,
Vi = 14V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
8.65
8.6
Typ.
Max.
9.35
9.4
Unit
V
9
9
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 11 V
V
∆Vo
Vi = 11 to 25 V
Vi = 11 to 20 V
130
65
mV
mV
∆Vo
Id
Load Regulation
Io = 20 mA to 2 A
130
8
mV
mA
Quiescent Current
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1.3
mA
Io = 20 mA Vi = 11 to 25 V
mA
mV/oC
∆Vo
∆T
Io = 5 mA
Tj = -55 to 150 oC
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
60
µV
dB
V
53
12
Io ≤ 1.5 A
Ro
f = 1KHz
17
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
ELECTRICAL CHARACTERISTICS FOR L78S10 (refer to the test circuits, Tj = 25 oC,
Vi = 15V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
9.5
Typ.
10
Max.
10.5
10.6
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 12.5 V
9.4
10
V
∆Vo
Vi = 12.5 to 30 V
Vi = 14 to 22 V
200
100
mV
mV
∆Vo
Id
Load Regulation
Io = 20 mA to 2 A
150
8
mV
mA
Quiescent Current
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1
mA
Io = 20 mA Vi = 12.5 to 30 V
mA
mV/oC
∆Vo
∆T
Io = 5 mA
Tj = -55 to 150 oC
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
65
µV
dB
V
53
13
Io ≤ 1.5 A
Ro
f = 1KHz
17
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
6/21
L78S00 SERIES
ELECTRICAL CHARACTERISTICS FOR L78S12 (refer to the test circuits, Tj = 25 oC,
Vi = 19V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
11.5
11.4
Typ.
12
Max.
12.5
12.6
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 14.5 V
12
V
∆Vo
Vi = 14.5 to 30 V
Vi = 16 to 22 V
240
120
mV
mV
∆Vo
Id
Load Regulation
Io = 20 mA to 2 A
160
8
mV
mA
Quiescent Current
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1
mA
Io = 20 mA Vi = 14.5 to 30 V
mA
mV/oC
∆Vo
∆T
Io = 5 mA
Tj = -55 to 150 oC
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
75
µV
dB
V
53
15
Io ≤ 1.5 A
Ro
f = 1KHz
18
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
ELECTRICAL CHARACTERISTICS FOR L78S15 (refer to the test circuits, Tj = 25 oC,
Vi = 23V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
14.4
Typ.
15
Max.
15.6
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 17.5 V
14.25
15
15.75
V
∆Vo
Vi = 17.5 to 30 V
Vi = 20 to 26 V
300
150
mV
mV
∆Vo
Id
Load Regulation
Io = 20 mA to 2 A
180
8
mV
mA
Quiescent Current
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1
mA
Io = 20 mA Vi = 17.5 to 30 V
mA
mV/oC
∆Vo
∆T
Io = 5 mA
Tj = -55 to 150 oC
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
90
µV
dB
V
52
18
Io ≤ 1.5 A
Ro
f = 1KHz
19
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
7/21
L78S00 SERIES
ELECTRICAL CHARACTERISTICS FOR L78S18 (refer to the test circuits, Tj = 25 oC,
Vi = 26V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
17.1
17
Typ.
18
Max.
18.9
19
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 20.5 V
18
V
∆Vo
Vi = 20.5 to 30 V
Vi = 22 to 28 V
360
180
mV
mV
∆Vo
Id
Load Regulation
Io = 20 mA to 2 A
200
8
mV
mA
Quiescent Current
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1
mA
Io = 20 mA Vi = 22 to 33 V
mA
mV/oC
∆Vo
∆T
Io = 5 mA
Tj = -55 to 150 oC
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
110
µV
dB
V
49
21
Io ≤ 1.5 A
Ro
f = 1KHz
22
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
ELECTRICAL CHARACTERISTICS FOR L78S24 (refer to the test circuits, Tj = 25 oC,
Vi = 33V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
23
Typ.
24
Max.
25
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 27 V
22.8
24
25.2
V
∆Vo
Vi = 27 to 38 V
Vi = 30 to 36 V
480
240
mV
mV
∆Vo
Id
Load Regulation
Io = 20 mA to 2 A
250
8
mV
mA
Quiescent Current
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1
mA
Io = 20 mA Vi = 8 to 25 V
mA
mV/oC
∆Vo
∆T
Io = 5 mA
Tj = -55 to 150 oC
-1.5
170
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
µV
dB
V
48
27
Io ≤ 1.5 A
Ro
f = 1KHz
23
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
8/21
L78S00 SERIES
ELECTRICAL CHARACTERISTICS FOR L78S05C (refer to the test circuits, Tj = 25 oC,
Vi = 10V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
4.8
Typ.
Max.
5.2
Unit
V
5
5
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 7 V
4.75
5.25
V
∆Vo
Vi = 7 to 25 V
Vi = 8 to 12 V
100
50
mV
mV
∆Vo
Load Regulation
Io = 20 mA to 1.5 A
Io = 2 A
100
mV
80
Id
Quiescent Current
8
mA
mA
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1.3
Io = 20 mA Vi = 7 to 25 V
mA
mV/oC
o
∆Vo
∆T
Io = 5 mA
Tj = 0 to 70 C
-1.1
40
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
µV
dB
V
54
8
Io ≤ 1.5 A
Ro
f = 1KHz
17
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
ELECTRICAL CHARACTERISTICS FOR L78S75C (refer to the test circuits, Tj = 25 oC,
Vi = 12.5V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
7.15
7.1
Typ.
7.5
Max.
7.9
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 9.5 V
7.5
7.95
V
∆Vo
Vi = 9.5 to 25 V
Vi = 10.5 to 20 V
120
60
mV
mV
∆Vo
Load Regulation
Io = 20 mA to 1.5 A
Io = 2 A
140
mV
100
Id
Quiescent Current
8
mA
mA
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1.3
Io = 20 mA Vi = 9.5 to 25 V
mA
mV/oC
∆Vo
∆T
Io = 5 mA
Tj = 0 to 70 oC
-0.8
52
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
µV
dB
V
48
Io ≤ 1.5 A
10.5
Ro
f = 1KHz
16
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
9/21
L78S00 SERIES
ELECTRICAL CHARACTERISTICS FOR L78S09C (refer to the test circuits, Tj = 25 oC,
Vi = 14V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
8.65
8.6
Typ.
Max.
9.35
9.4
Unit
V
9
9
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 11 V
V
∆Vo
Vi = 11 to 25 V
Vi = 11 to 20 V
130
65
mV
mV
∆Vo
Load Regulation
Io = 20 mA to 1.5 A
Io = 2 A
170
mV
100
Id
Quiescent Current
8
mA
mA
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
0.5
1.3
Io = 20 mA Vi = 11 to 25 V
mA
mV/oC
o
∆Vo
∆T
Io = 5 mA
Tj = 0 to 70 C
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
60
µV
dB
V
47
12
Io ≤ 1.5 A
Ro
f = 1KHz
17
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
ELECTRICAL CHARACTERISTICS FOR L78S10C (refer to the test circuits, Tj = 25 oC,
Vi = 15V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
9.5
Typ.
10
Max.
10.5
10.6
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 12.5 V
9.4
10
V
∆Vo
Vi = 12.5 to 30 V
Vi = 14 to 22 V
200
100
mV
mV
∆Vo
Load Regulation
Io = 20 mA to 1.5 A
Io = 2 A
240
mV
150
Id
Quiescent Current
8
0.5
1
mA
mA
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
Io = 20 mA Vi = 12.5 to 30 V
mA
mV/oC
o
∆Vo
∆T
Io = 5 mA
Tj = 0 to 70 C
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
65
µV
dB
V
47
13
Io ≤ 1.5 A
Ro
f = 1KHz
17
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
10/21
L78S00 SERIES
ELECTRICAL CHARACTERISTICS FOR L78S12C (refer to the test circuits, Tj = 25 oC,
Vi = 19V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
11.5
11.4
Typ.
12
Max.
12.5
12.6
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 14.5 V
12
V
∆Vo
Vi = 14.5 to 30 V
Vi = 16 to 22 V
240
120
mV
mV
∆Vo
Load Regulation
Io = 20 mA to 1.5 A
Io = 2 A
240
mV
150
Id
Quiescent Current
8
0.5
1
mA
mA
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
Io = 20 mA Vi = 14.5 to 30 V
mA
mV/oC
o
∆Vo
∆T
Io = 5 mA
Tj = 0 to 70 C
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
75
µV
dB
V
47
15
Io ≤ 1.5 A
Ro
f = 1KHz
18
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
ELECTRICAL CHARACTERISTICS FOR L78S15C (refer to the test circuits, Tj = 25 oC,
Vi = 23V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
14.4
Typ.
15
Max.
15.6
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 17.5 V
14.25
15
15.75
V
∆Vo
Vi = 17.5 to 30 V
Vi = 20 to 26 V
300
150
mV
mV
∆Vo
Load Regulation
Io = 20 mA to 1.5 A
Io = 2 A
300
mV
150
Id
Quiescent Current
8
0.5
1
mA
mA
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
Io = 20 mA Vi = 17.5 to 30 V
mA
mV/oC
o
∆Vo
∆T
Io = 5 mA
Tj = 0 to 70 C
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
90
µV
dB
V
46
18
Io ≤ 1.5 A
Ro
f = 1KHz
19
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
11/21
L78S00 SERIES
ELECTRICAL CHARACTERISTICS FOR L78S18C (refer to the test circuits, Tj = 25 oC,
Vi = 26V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
17.1
17
Typ.
18
Max.
18.9
19
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 20.5 V
18
V
∆Vo
Vi = 20.5 to 30 V
Vi = 22 to 28 V
360
180
mV
mV
∆Vo
Load Regulation
Io = 20 mA to 1.5 A
Io = 2 A
360
mV
200
Id
Quiescent Current
8
0.5
1
mA
mA
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
Io = 20 mA Vi = 20.5 to 30 V
mA
mV/oC
o
∆Vo
∆T
Io = 5 mA
Tj = 0 to 70 C
-1
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
110
µV
dB
V
43
21
Io ≤ 1.5 A
Ro
f = 1KHz
22
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
ELECTRICAL CHARACTERISTICS FOR L78S24C (refer to the test circuits, Tj = 25 oC,
Vi = 33V, Io = 500 mA unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Min.
23
Typ.
24
Max.
25
Unit
V
Vo
Output Voltage
Line Regulation
Io = 1 A
Vi = 27 V
22.8
24
25.2
V
∆Vo
Vi = 27 to 38 V
Vi = 30 to 36 V
480
240
mV
mV
∆Vo
Load Regulation
Io = 20 mA to 1.5 A
Io = 2 A
480
mV
300
Id
Quiescent Current
8
0.5
1
mA
mA
∆Id
∆Id
Quiescent Current Change
Quiescent Current Change
Output Voltage Drift
Io = 20 mA to 1A
Io = 20 mA Vi = 27 to 38 V
mA
mV/oC
o
∆Vo
∆T
Io = 5 mA
Tj = 0 to 70 C
-1.5
170
eN
SVR
Vi
Output Noise Voltage
Supply Voltage Rejection
Operating Input Voltage
Output Resistance
B = 10Hz to 100KHz
f = 120 Hz
µV
dB
V
42
27
Io ≤ 1.5 A
Ro
f = 1KHz
28
500
3
mΩ
mA
A
Isc
Short Circuit Current
Vi = 27 V
Iscp
Short Circuit Peack Current
12/21
L78S00 SERIES
Figure 4 : Dropout Voltage vs. Junction Tempera-
Figure 5 : Peak Output Current vs. Input/Output
ture.
Differential Voltage.
Figure 6 : Supply Voltage Rejection vs. Frequen-
Figure 7 : Output Voltage vs. Junction Tempera-
cy.
ture.
Figure 8 : Output Impedance vs. Frequency.
Figure 9 : Quiescent Current vs. Junction Tempe-
rature.
13/21
L78S00 SERIES
Figure 10 : Load Transient Response.
Figure 11 : Line Transient Response.
Figure 12 : Quiescent Current vs. Input Voltage.
Figure 13 : Fixed Output Regulator.
Figure 14 : Constant Current Regulator.
VXX
IO =
+ Id
R1
Notes : 1. To specify an output voltage, substitute voltage
value for ”XX”.
2. Although no output capacitor is needed for sta-
bility, it does improve transient response.
3. Required if regulator is located an appreciable
dis-tance from power supply filter.
14/21
L78S00 SERIES
Figure 15 : Circuit for Increasing Output Voltage.
Figure 16 : Adjustable Output Regulator
(7 to 30V).
IR1 ≥ 5 Id
R2
R1
V0 = VXX (1 +
) + Id R2
Figure 17 : 0.5 to 10V Regulator.
Figure 18 : High Current Voltage Regulator.
VBEQ
1
R1 =
IQ
1
IREQ
–
βQ1
R4
VO = VXX
R1
VBEQ
1
IO = IREG + Q1 [IREG
–
]
R1
Figure 19 : High Output Current with Short Circuit
Figure 20 : Tracking Voltage Regulator.
Protection.
VBEQ
2
RSC
=
ISC
15/21
L78S00 SERIES
Figure 21 : Positive and Negative Regulator.
Figure 22 : Negative Output Voltage Circuit.
(*) D1 and D2 are necessary if the load is connected be-
tween + V0 and – V0.
Figure 23 : Switching Regulator.
Figure 24 : High Input Voltage Circuit.
VIN = Vi – (VZ + VBE
)
Figure 25 : High Input Voltage Circuit.
Figure 26 : High Output VoltageRegulator.
VIN = VZ - VBE
16/21
L78S00 SERIES
Figure 27 : High Input and Output Voltage.
Figure 28 : Reducing Power Dissipation with
Dropping Resistor.
Vi(min) – VXX – VDROP(max)
R =
VO = VXX + VZ1
IO(max) + Id(max)
Figure 29 : Remote Shuntdown.
Figure 30 : Power AM Modulator (unity voltage
gain, Io ≤ 1A).
Note : The circuit performs well up to 100KHz.
Figure 31 : Adjustable Output Voltage with Tem-
perature Compensation.
R2
VO = VXX (1 +
) + VBE
R1
Note :Q2 is connected as a diode in order to compensate
the variation of the Q1 VBE with the temperature. C
allows a slow rise-time of the VO
17/21
L78S00 SERIES
Figure 32 : Light Controllers (Vo min = Vxx + VBE).
VO falls when the light goes up
VO rises when the light goes up
Figure 33 : Protection against Input Short-circuit
with High Capacitance Loads.
Applications with high capacitance loads and an
output voltage greater than 6 volts need an external
diode(see fig. 33) to protect thedevice against input
short circuit. In this case the input voltage falls
rapidly while the output voltage decreases showly.
The capacitance discharges by means of the Base-
Emitter junction of the series pass transistor in the
regulator. If the energy is sufficiently high, the tran-
sistor may be destroyed. The external diode by-
passes the current from the IC to ground.
18/21
L78S00 SERIES
TO-3 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
11.00
0.97
TYP.
MAX.
13.10
1.15
MIN.
0.433
0.038
0.059
0.327
0.748
0.421
0.649
0.984
0.157
1.515
1.187
MAX.
0.516
0.045
0.065
0.351
0.787
0.437
0.677
1.023
0.161
1.547
1.193
A
B
C
D
E
G
N
P
R
U
V
1.50
1.65
8.32
8.92
19.00
10.70
16.50
25.00
4.00
20.00
11.10
17.20
26.00
4.09
38.50
30.00
39.30
30.30
A
D
P
C
G
R
P003F
19/21
L78S00 SERIES
TO-220 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
4.60
1.32
2.72
MIN.
0.173
0.048
0.094
MAX.
0.181
0.051
0.107
A
C
4.40
1.23
2.40
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
15.2
6.2
14.0
2.95
15.9
6.6
0.511
0.104
0.598
0.244
0.137
0.147
0.551
0.116
0.625
0.260
0.165
0.151
3.5
4.2
3.75
3.85
L2
Dia.
L5
L9
L7
L6
L4
P011C
20/21
L78S00 SERIES
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specificationsmentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproductsare notauthorized foruse ascritical componentsin life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
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