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L78S10T
Datasheet
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SGS Thomson Microelectronics L78S10T, L78S09CV, L78S09CT, L78S05T, L78S05CV Datasheet

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L78S00
SER IES
January 1993
2A POSITIVEVOLTAGE REGULATORS
.OUTPUTCURRENT TO 2A
.OUTPUTVOLTAGESOF5;7.5; 9; 10;12; 15;
18 ; 24V
.THERMALOVERLOAD PROTECTION
.OUTPUTTRANSISTOR SOA PROTECTION
DESCRIPTION
The L78S00 series ofthree-terminal positive regu­lators is available in TO-220 and TO-3 packages and with several fixed output voltages, making it useful in a widerange of applications. Theseregu­lators canprovide local on-cardregulation, eliminat­ing the distribution problems associated with single pointregulation. Eachtypeemploysinternalcurrent limiting, thermal shut-down and safe area protec­tion,makingitessentially indestructible. Ifadequate heat sinking is provided, they can deliver over 2A outputcurrent. Althoughdesigned primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents.
TO-220
BLOCK DIAGRAM
TO-3
1/21
ABSOLUTE MAXI MUM RAT IN G S
Symbol Parameter Value Unit
V
i
DC Input Voltage (for Vo= 5 to 18V)
(for V
o
=24V)
35 40
V V
I
o
Output Current Internally limited
P
tot
Power Dissipation Internally limited
T
stg
Storage Temperature – 65 to + 150 °C
T
op
Operating Junction Temperature (for L78S00)
(for L78S00C )
–55to+150
0to+150
°C °C
THERMALDATA
TO-220 TO-3
R
th j-case
R
th j-amb
Thermal Resistance Junction-case Thermal Resistance Junction-ambient
Max Max
3
50
4
35
°C/W °C/W
CONN E CTION DIAGRAMS A N D ORDERI NG 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 L78S24C
L78S05CV L78S75CV L78S09CV L78S10CV L78S12CV L78S15CV L78S18CV L78S24CV
L78S05T L78S05CT L78S75T L78S75CT L78S09T L78S09CT L78S10T L78S10CT L78S12T L78S12CT L78S15T L78S15CT L78S18T L78S18CT L78S24T L78S24CT
5V 5V
7.5V
7.5V 9V 9V 10V 10V 12V 12V 15V 15V 18V 18V 24V 24V
L78S00 SERIES
2/21
APPLICATION CIRCUIT
SCHEMAT IC D I AGRAM
L78S00 SERIES
3/21
TEST CIRCUI TS Figure 1 : DC Parameters. Figure 2 : Load Regulation.
Figure 3 : Ripple Rejection.
L78S00 SERIES
4/21
ELECTRICAL CHARACTERISTICS FOR L78S05 (refer to the test circuits, Tj=25oC, Vi= 10V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 4.8 5 5.2 V
V
o
Output Voltage Io=1A Vi= 7 V 4.75 5 5.25 V
∆V
o
Line Regulation Vi= 7 to 25 V
Vi= 8 to 25 V
100
50
mV mV
∆V
o
Load Regulation Io= 20 mA to 2 A 100 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 7 to 25 V 1.3 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= -55 to 150oC -1.1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 40 µV
SVR Supply Voltage Rejection f = 120 Hz 60 dB
V
i
Operating Input Voltage Io≤ 1.5 A 8 V
R
o
Output Resistance f = 1KHz 17 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
ELECTRICAL CHARACTERISTICS FOR L78S75 (refer to the test circuits, Tj=25oC, Vi= 12.5V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 7.15 7.5 7.9 V
V
o
Output Voltage Io=1A Vi= 9.5 V 7.1 7.5 7.95 V
∆V
o
Line Regulation Vi= 9.5 to 25 V
V
i
= 10.5 to 20 V
120
60
mV mV
∆V
o
Load Regulation Io= 20 mA to 2 A 120 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 9.5 to 25 V 1.3 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= -55 to 150oC -0.8 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 52 µV
SVR Supply Voltage Rejection f = 120 Hz 54 dB
V
i
Operating Input Voltage Io≤ 1.5 A 10.5 V
R
o
Output Resistance f = 1KHz 16 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
L78S00 SERIES
5/21
ELECTRICAL CHARACTERISTICS FOR L78S09 (refer to the test circuits, Tj=25oC, Vi= 14V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 8.65 9 9.35 V
V
o
Output Voltage Io=1A Vi= 11 V 8.6 9 9.4 V
∆V
o
Line Regulation Vi=11to25V
Vi=11to20V
130
65
mV mV
∆V
o
Load Regulation Io= 20 mA to 2 A 130 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 11 to 25 V 1.3 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= -55 to 150oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 60 µV
SVR Supply Voltage Rejection f = 120 Hz 53 dB
V
i
Operating Input Voltage Io≤ 1.5 A 12 V
R
o
Output Resistance f = 1KHz 17 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
ELECTRICAL CHARACTERISTICS FOR L78S10 (refer to the test circuits, Tj=25oC, Vi= 15V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 9.5 10 10.5 V
V
o
Output Voltage Io=1A Vi= 12.5 V 9.4 10 10.6 V
∆V
o
Line Regulation Vi= 12.5 to 30 V
V
i
=14to22V
200 100
mV mV
∆V
o
Load Regulation Io= 20 mA to 2 A 150 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 12.5 to 30 V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= -55 to 150oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 65 µV
SVR Supply Voltage Rejection f = 120 Hz 53 dB
V
i
Operating Input Voltage Io≤ 1.5 A 13 V
R
o
Output Resistance f = 1KHz 17 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
L78S00 SERIES
6/21
ELECTRICAL CHARACTERISTICS FOR L78S12 (refer to the test circuits, Tj=25oC, Vi= 19V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 11.5 12 12.5 V
V
o
Output Voltage Io=1A Vi= 14.5 V 11.4 12 12.6 V
∆V
o
Line Regulation Vi= 14.5 to 30 V
Vi=16to22V
240 120
mV mV
∆V
o
Load Regulation Io= 20 mA to 2 A 160 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 14.5 to 30 V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= -55 to 150oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 75 µV
SVR Supply Voltage Rejection f = 120 Hz 53 dB
V
i
Operating Input Voltage Io≤ 1.5 A 15 V
R
o
Output Resistance f = 1KHz 18 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
ELECTRICAL CHARACTERISTICS FOR L78S15 (refer to the test circuits, Tj=25oC, Vi= 23V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 14.4 15 15.6 V
V
o
Output Voltage Io=1A Vi= 17.5 V 14.25 15 15.75 V
∆V
o
Line Regulation Vi= 17.5 to 30 V
V
i
=20to26V
300 150
mV mV
∆V
o
Load Regulation Io= 20 mA to 2 A 180 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 17.5 to 30 V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= -55 to 150oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 90 µV
SVR Supply Voltage Rejection f = 120 Hz 52 dB
V
i
Operating Input Voltage Io≤ 1.5 A 18 V
R
o
Output Resistance f = 1KHz 19 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
L78S00 SERIES
7/21
ELECTRICAL CHARACTERISTICS FOR L78S18 (refer to the test circuits, Tj=25oC, Vi= 26V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 17.1 18 18.9 V
V
o
Output Voltage Io=1A Vi= 20.5 V 17 18 19 V
∆V
o
Line Regulation Vi= 20.5 to 30 V
Vi=22to28V
360 180
mV mV
∆V
o
Load Regulation Io= 20 mA to 2 A 200 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi=22to33V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= -55 to 150oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 110 µV
SVR Supply Voltage Rejection f = 120 Hz 49 dB
V
i
Operating Input Voltage Io≤ 1.5 A 21 V
R
o
Output Resistance f = 1KHz 22 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
ELECTRICAL CHARACTERISTICS FOR L78S24 (refer to the test circuits, Tj=25oC, Vi= 33V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 23 24 25 V
V
o
Output Voltage Io=1A Vi= 27 V 22.8 24 25.2 V
∆V
o
Line Regulation Vi=27to38V
V
i
=30to36V
480 240
mV mV
∆V
o
Load Regulation Io= 20 mA to 2 A 250 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 8 to 25 V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= -55 to 150oC -1.5 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 170 µV
SVR Supply Voltage Rejection f = 120 Hz 48 dB
V
i
Operating Input Voltage Io≤ 1.5 A 27 V
R
o
Output Resistance f = 1KHz 23 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
L78S00 SERIES
8/21
ELECTRICAL CHARACTERISTICS FOR L78S05C (refer to the test circuits, Tj=25oC, Vi= 10V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 4.8 5 5.2 V
V
o
Output Voltage Io=1A Vi= 7 V 4.75 5 5.25 V
∆V
o
Line Regulation Vi= 7 to 25 V
Vi= 8 to 12 V
100
50
mV mV
∆V
o
Load Regulation Io= 20 mA to 1.5 A
Io=2A 80
100 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 7 to 25 V 1.3 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= 0 to 70oC -1.1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 40 µV
SVR Supply Voltage Rejection f = 120 Hz 54 dB
V
i
Operating Input Voltage Io≤ 1.5 A 8 V
R
o
Output Resistance f = 1KHz 17 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
ELECTRICAL CHARACTERISTICS FOR L78S75C (refer to the test circuits, Tj=25oC, Vi= 12.5V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 7.15 7.5 7.9 V
V
o
Output Voltage Io=1A Vi= 9.5 V 7.1 7.5 7.95 V
∆V
o
Line Regulation Vi= 9.5 to 25 V
V
i
= 10.5 to 20 V
120
60
mV mV
∆V
o
Load Regulation Io= 20 mA to 1.5 A
Io= 2 A 100
140 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 9.5 to 25 V 1.3 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= 0 to 70oC -0.8 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 52 µV
SVR Supply Voltage Rejection f = 120 Hz 48 dB
V
i
Operating Input Voltage Io≤ 1.5 A 10.5 V
R
o
Output Resistance f = 1KHz 16 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
L78S00 SERIES
9/21
ELECTRICAL CHARACTERISTICS FOR L78S09C (refer to the test circuits, Tj=25oC, Vi= 14V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 8.65 9 9.35 V
V
o
Output Voltage Io=1A Vi= 11 V 8.6 9 9.4 V
∆V
o
Line Regulation Vi=11to25V
Vi=11to20V
130
65
mV mV
∆V
o
Load Regulation Io= 20 mA to 1.5 A
Io= 2 A 100
170 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 11 to 25 V 1.3 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= 0 to 70oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 60 µV
SVR Supply Voltage Rejection f = 120 Hz 47 dB
V
i
Operating Input Voltage Io≤ 1.5 A 12 V
R
o
Output Resistance f = 1KHz 17 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
ELECTRICAL CHARACTERISTICS FOR L78S10C (refer to the test circuits, Tj=25oC, Vi= 15V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 9.5 10 10.5 V
V
o
Output Voltage Io=1A Vi= 12.5 V 9.4 10 10.6 V
∆V
o
Line Regulation Vi= 12.5 to 30 V
V
i
=14to22V
200 100
mV mV
∆V
o
Load Regulation Io= 20 mA to 1.5 A
Io= 2 A 150
240 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 12.5 to 30 V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= 0 to 70oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 65 µV
SVR Supply Voltage Rejection f = 120 Hz 47 dB
V
i
Operating Input Voltage Io≤ 1.5 A 13 V
R
o
Output Resistance f = 1KHz 17 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
L78S00 SERIES
10/21
ELECTRICAL CHARACTERISTICS FOR L78S12C (refer to the test circuits, Tj=25oC, Vi= 19V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 11.5 12 12.5 V
V
o
Output Voltage Io=1A Vi= 14.5 V 11.4 12 12.6 V
∆V
o
Line Regulation Vi= 14.5 to 30 V
Vi=16to22V
240 120
mV mV
∆V
o
Load Regulation Io= 20 mA to 1.5 A
Io= 2 A 150
240 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 14.5 to 30 V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= 0 to 70oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 75 µV
SVR Supply Voltage Rejection f = 120 Hz 47 dB
V
i
Operating Input Voltage Io≤ 1.5 A 15 V
R
o
Output Resistance f = 1KHz 18 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
ELECTRICAL CHARACTERISTICS FOR L78S15C (refer to the test circuits, Tj=25oC, Vi= 23V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 14.4 15 15.6 V
V
o
Output Voltage Io=1A Vi= 17.5 V 14.25 15 15.75 V
∆V
o
Line Regulation Vi= 17.5 to 30 V
V
i
=20to26V
300 150
mV mV
∆V
o
Load Regulation Io= 20 mA to 1.5 A
Io= 2 A 150
300 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 17.5 to 30 V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= 0 to 70oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 90 µV
SVR Supply Voltage Rejection f = 120 Hz 46 dB
V
i
Operating Input Voltage Io≤ 1.5 A 18 V
R
o
Output Resistance f = 1KHz 19 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
L78S00 SERIES
11/21
ELECTRICAL CHARACTERISTICS FOR L78S18C (refer to the test circuits, Tj=25oC, Vi= 26V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 17.1 18 18.9 V
V
o
Output Voltage Io=1A Vi= 20.5 V 17 18 19 V
∆V
o
Line Regulation Vi= 20.5 to 30 V
Vi=22to28V
360 180
mV mV
∆V
o
Load Regulation Io= 20 mA to 1.5 A
Io= 2 A 200
360 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi= 20.5 to 30 V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= 0 to 70oC -1 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 110 µV
SVR Supply Voltage Rejection f = 120 Hz 43 dB
V
i
Operating Input Voltage Io≤ 1.5 A 21 V
R
o
Output Resistance f = 1KHz 22 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
ELECTRICAL CHARACTERISTICS FOR L78S24C (refer to the test circuits, Tj=25oC, Vi= 33V, Io= 500 mA unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
Output Voltage 23 24 25 V
V
o
Output Voltage Io=1A Vi= 27 V 22.8 24 25.2 V
∆V
o
Line Regulation Vi=27to38V
V
i
=30to36V
480 240
mV mV
∆V
o
Load Regulation Io= 20 mA to 1.5 A
Io= 2 A 300
480 mV
I
d
Quiescent Current 8mA
∆I
d
Quiescent Current Change Io= 20 mA to 1A 0.5 mA
∆I
d
Quiescent Current Change Io=20mA Vi=27to38V 1 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA Tj= 0 to 70oC -1.5 mV/oC
e
N
Output Noise Voltage B = 10Hz to 100KHz 170 µV
SVR Supply Voltage Rejection f = 120 Hz 42 dB
V
i
Operating Input Voltage Io≤ 1.5 A 27 V
R
o
Output Resistance f = 1KHz 28 mΩ
I
sc
Short Circuit Current Vi= 27 V 500 mA
I
scp
Short Circuit Peack Current 3 A
L78S00 SERIES
12/21
Figure 6 : Supply VoltageRejection vs. Frequen-
cy.
Figure 7 : Output Voltage vs. JunctionTempera-
ture.
Figure 4 : Dropout Voltage vs. Junction Tempera-
ture.
Figure 5 : Peak OutputCurrent vs. Input/Output
Differential Voltage.
Figure8 : Output Impedance vs. Frequency. Figure9 : Quiescent Current vs. JunctionTempe-
rature.
L78S00 SERIES
13/21
Figure 12 : QuiescentCurrent vs. Input Voltage.
Figure 13 : Fixed OutputRegulator. Figure 14 : Constant Current Regulator.
Figure 10 : Load Transient Response. Figure 11 : Line TransientResponse.
Notes : 1. To specify an output voltage, substitute voltage
value for ”XX”.
2. Although no output capacitor is needed for sta­bility, it does improve transient response.
3. Required if regulator is located an appreciable dis-tance from power supply filter.
V
XX
IO=+I
d
R
1
L78S00 SERIES
14/21
Figure15 : Circuitfor Increasing Output Voltage. Figure 16 : Adjustable Output Regulator
(7 to 30V).
Figure 17 : 0.5 to 10V Regulator. Figure 18 : High Current Voltage Regulator.
V
BEQ
1
R1=
I
Q
1
I
REQ
–
β
Q
1
V
BEQ
1
IO=I
REG
+Q1[I
REG
–]
R
1
R
4
V
O=VXX
R
1
IR1≥ 5I
d
R
2
V0=VXX(1 + ) + IdR
2
R
1
Figure 19 : High Output Current with Short Circuit
Protection.
Figure 20 : TrackingVoltage Regulator.
V
BEQ
2
RSC=
I
SC
L78S00 SERIES
15/21
Figure 21 : Positiveand NegativeRegulator. Figure 22 : Negative Output Voltage Circuit.
Figure 23 : Switching Regulator. Figure 24 : High Input Voltage Circuit.
VIN=Vi–(VZ+VBE)
(*) D1and D2are necessary if the load is connected be­tween + V0and – V0.
Figure 25 : High Input Voltage Circuit. Figure 26 : High Output VoltageRegulator.
VIN=VZ-V
BE
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Figure 27 : High Input and Output Voltage. Figure 28 : Reducing Power Dissipation with
Dropping Resistor.
VO=VXX+V
Z1
V
i(min)–VXX–VDROP(max)
R=
I
O(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 : AdjustableOutput Voltage with Tem-
peratureCompensation.
Note :Q2is conn ec ted as a diode in order to compensate
the variation of the Q1VBEwit h the tem perature. C allows a slow rise-time of the V
O
R
2
VO=VXX(1+ ) + V
BE
R
1
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Figure 32 : Light Controllers (V
o min=Vxx+VBE
).
VOfalls when the lightgoes up VOrises when the light goes up
Figure 33 : Protectionagainst Input Short-circuit
withHigh Capacitance Loads.
Applications with high capacitance loads and an outputvoltage greater than 6 volts needan external diode(see fig.33)to protect the deviceagainst input short circuit. In this case the input voltage falls rapidly while the output voltage decreases showly. The capacitancedischarges by means of the Base­Emitter junction of the series pass transistor in the regulator. If the energy is sufficientlyhigh, the tran­sistor may be destroyed. The external diode by­passes thecurrent from the IC to ground.
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DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 11.00 13.10 0.433 0.516
B 0.97 1.15 0.038 0.045
C 1.50 1.65 0.059 0.065
D 8.32 8.92 0.327 0.351
E 19.00 20.00 0.748 0.787
G 10.70 11.10 0.421 0.437
N 16.50 17.20 0.649 0.677
P 25.00 26.00 0.984 1.023
R 4.00 4.09 0.157 0.161
U 38.50 39.30 1.515 1.547
V 30.00 30.30 1.187 1.193
C
D
N
B
V
U
R
A
P
E
G
O
P003F
TO-3 MECHANICAL DATA
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DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.40 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 0.107
D1 1.27 0.050
E 0.49 0.70 0.019 0.027
F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067
G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 0.409
L2 16.4 0.645 L4 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.2 15.9 0.598 0.625 L7 6.2 6.6 0.244 0.260 L9 3.5 4.2 0.137 0.165
DIA. 3.75 3.85 0.147 0.151
L6
A
C
D
E
D1
F
G
L7
L2
Dia.
F1
L5
L4
H2
L9
F2
G1
TO-220 MECHANICAL DATA
P011C
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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 infringementof patents or other rights of third parties which may results from its use. No license isgranted by implication or otherwise underany patent or patentrights of SGS-THOMSON Microelectronics. Specificationsmentioned in this publication are subject to changewithout notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronicsproductsare notauthorizedforuse ascritical componentsinlife supportdevices orsystems withoutexpress written approval of SGS-THOMSON Microelectonics.
1994 SGS-THOMSON Microelectronics - All RightsReserved
SGS-THOMSON MicroelectronicsGROUP OF COMPANIES
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Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A
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