STMicroelectronics L78S10CV Short circuit protection Datasheet

L78S
2 A positive voltage regulator IC
Datasheet - production data
Description
TO-220
Features
• Output current up to 2 A
• Output voltages of 5; 7.5; 9; 10; 12; 15; 18; 24 V
The L78S series of three-terminal positive
regulators is available in TO-220 package and
several fixed output voltages, 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 embeds internal current
limiting, thermal shut-down and safe area
protection, making it essentially indestructible. If
adequate heat sinking is provided, they can
deliver over 2 A output current. Although
designed primarily as fixed voltage regulators,
these devices can be used with external
components to obtain adjustable voltages and
currents.
• Thermal protection
• Short circuit protection
• Output transition SOA protection
Table 1. Device summary
TO-220 packages
Part numbers
Output voltage
Dual gauge
Single gauge
L78S05C
L78S05CV-DG
L78S05CV
5V
L78S75C
L78S75CV-DG
L78S75CV
7.5 V
L78S09C
L78S09CV-DG
L78S09CV
9V
L78S10C
L78S10CV-DG
L78S10CV
10 V
L78S12C
L78S12CV-DG
L78S12CV
12 V
L78S15C
L78S15CV-DG
L78S15CV
15 V
L78S18C
L78S18CV
18 V
L78S24C
L78S24CV
24 V
March 2014
This is information on a product in full production.
DocID2148 Rev 8
1/35
www.st.com
Contents
L78S
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4
Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
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L78S
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics of L78S05C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical characteristics of L78S75C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical characteristics of L78S09C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical characteristics of L78S10C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electrical characteristics of L78S12C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical characteristics of L78S15C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electrical characteristics of L78S18C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electrical characteristics of L78S24C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TO-220 (dual gauge) mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
TO-220 SG (single gauge) mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
DocID2148 Rev 8
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List of figures
L78S
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
Figure 41.
4/35
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DC parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Ripple rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Dropout voltage vs. junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Peak output current vs. input/output differential voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Output impedance vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Output voltage vs. junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Quiescent current vs. junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Load transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Line transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Quiescent current vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Fixed output regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Constant current regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Circuit for increasing output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Adjustable output regulator (7 to 30 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
0.5 to 10 V regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
High current voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
High output current with short circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Tracking voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Positive and negative regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Negative output voltage circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Switching regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
High input voltage circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
High input voltage circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
High output voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
High input and output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Reducing power dissipation with dropping resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Remote shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Power AM modulator (unity voltage gain, IO £ 1 A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Adjustable output voltage with temperature compensation . . . . . . . . . . . . . . . . . . . . . . . . 26
Light controllers (VOmin = VXX + VBE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Protection against input short-circuit with high capacitance loads . . . . . . . . . . . . . . . . . . . 27
TO-220 (dual gauge) drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
TO-220 SG (single gauge) drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Tube for TO-220 (dual gauge) (mm.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Tube for TO-220 (single gauge) (mm.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
DocID2148 Rev 8
L78S
1
Diagram
Diagram
Figure 1. Block diagram
DocID2148 Rev 8
5/35
35
Pin configuration
2
L78S
Pin configuration
Figure 2. Pin connections (top view)
*5281'
72
Figure 3. Schematic diagram
6/35
DocID2148 Rev 8
L78S
3
Maximum ratings
Maximum ratings
Table 2. Absolute maximum ratings
Symbol
Parameter
Value
for VO= 5 to 18V
35
for VO= 24V
40
VI
DC input voltage
IO
Output current
Internally limited
PD
Power dissipation
Internally limited
TSTG
Storage temperature range
TOP
Operating junction temperature range
Note:
Unit
V
-65 to 150
°C
0 to 150
°C
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3. Thermal data
Symbol
Parameter
TO-220
Unit
RthJC
Thermal resistance junction-case
5
°C/W
RthJA
Thermal resistance junction-ambient
50
°C/W
Figure 4. Application circuits
4
DocID2148 Rev 8
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Test circuits
4
L78S
Test circuits
Figure 5. DC parameter
4
Figure 6. Load regulation
4
Figure 7. Ripple rejection
4
8/35
DocID2148 Rev 8
L78S
5
Electrical characteristics
Electrical characteristics
Refer to the test circuits, TJ = 25 °C, VI = 10 V, IO = 500 mA, unless otherwise specified.
Table 4. Electrical characteristics of L78S05C
Symbol
Parameter
VO
Output voltage
VO
Output voltage
ΔVO
Line regulation
ΔVO
Load regulation
IQ
ΔIQ
ΔVO/ΔT
eN
Test conditions
IO = 1 A, VI = 7 V
Min.
Typ.
Max.
Unit
4.8
5
5.2
V
4.75
5
5.25
V
VI = 7 to 25 V
100
VI = 8 to 25 V
50
IO = 20 mA to 1.5 A
100
mV
mV
IO = 2 A
80
Quiescent current
Quiescent current change
8
IO = 20 mA to 1 A
0.5
VI = 7 to 25 V, IO = 20 mA
1.3
Output voltage drift
IO = 5 mA, TJ = 0 °C to 70 °C
Output noise voltage
B = 10 Hz to 100 kHz
mA
mA
-1.1
mV/°C
40
µV
54(1)
dB
8
V
SVR
Supply voltage rejection
f = 120 Hz
VI
Operating input voltage
IO ≤ 1 A
RO
Output resistance
f = 1 kHz
17
mΩ
Isc
Short circuit current
VI = 27 V
500
mA
Iscp
Short circuit peak current
3
A
1. Guaranteed by design.
DocID2148 Rev 8
9/35
35
Electrical characteristics
L78S
Refer to the test circuits, TJ = 25 °C, VI = 12.5 V, IO = 500 mA, unless otherwise specified.
Table 5. Electrical characteristics of L78S75C
Symbol
Parameter
VO
Output voltage
VO
Output voltage
ΔVO
Line regulation
ΔVO
Load regulation
IQ
ΔIQ
ΔVO/ΔT
eN
Test conditions
IO = 1 A, VI = 9.5 V
Min.
Typ.
Max.
Unit
7.15
7.5
7.9
V
7.1
7.5
7.95
V
VI = 9.5 to 25 V
120
VI = 10.5 to 20 V
60
IO = 20 mA to 1.5 A
140
mV
mV
IO = 2 A
100
Quiescent current
Quiescent current change
8
IO = 20 mA to 1 A
0.5
VI = 9.5 to 25 V, IO = 20 mA
1.3
Output voltage drift
IO = 5 mA, TJ = 0 °C to 70 °C
Output noise voltage
B = 10 Hz to 100 kHz
mA
mA
-0.8
mV/°C
52
µV
SVR
Supply voltage rejection
f = 120 Hz
48(1)
VI
Operating input voltage
IO ≤ 1 A
10.5
RO
Output resistance
f = 1 kHz
16
mΩ
Isc
Short circuit current
VI = 27 V
500
mA
Iscp
Short circuit peak current
3
A
1. Guaranteed by design.
10/35
DocID2148 Rev 8
dB
V
L78S
Electrical characteristics
Refer to the test circuits, TJ = 25 °C, VI = 14 V, IO = 500 mA, unless otherwise specified.
Table 6. Electrical characteristics of L78S09C
Symbol
Parameter
VO
Output voltage
VO
Output voltage
ΔVO
Line regulation
ΔVO
Load regulation
IQ
ΔIQ
ΔVO/ΔT
eN
Test conditions
IO = 1 A, VI = 11 V
Min.
Typ.
Max.
Unit
8.65
9
9.35
V
8.6
9
9.4
V
VI = 11 to 25 V
130
VI = 11 to 20 V
65
IO = 20 mA to 1.5 A
170
mV
mV
IO = 2 A
100
Quiescent current
Quiescent current change
8
IO = 20 mA to 1 A
0.5
VI = 11 to 25 V, IO = 20 mA
1.3
Output voltage drift
IO = 5 mA, TJ = 0 °C to 70 °C
Output noise voltage
B = 10 Hz to 100 kHz
mA
mA
-1
mV/°C
60
µV
47(1)
dB
12
V
SVR
Supply voltage rejection
f = 120 Hz
VI
Operating input voltage
IO ≤ 1 A
RO
Output resistance
f = 1 kHz
17
mΩ
Isc
Short circuit current
VI = 27 V
500
mA
Iscp
Short circuit peak current
3
A
1. Guaranteed by design.
DocID2148 Rev 8
11/35
35
Electrical characteristics
L78S
Refer to the test circuits, TJ = 25 °C, VI = 15 V, IO = 500 mA, unless otherwise specified.
Table 7. Electrical characteristics of L78S10C
Symbol
Parameter
VO
Output voltage
VO
Output voltage
ΔVO
Line regulation
ΔVO
Load regulation
IQ
ΔIQ
ΔVO/ΔT
eN
Test conditions
IO = 1 A, VI = 12.5 V
Min.
Typ.
Max.
Unit
9.5
10
10.5
V
9.4
10
10.6
V
VI = 12.5 to 30 V
200
VI = 14 to 22 V
100
IO = 20 mA to 1.5 A
240
mV
mV
IO = 2 A
150
Quiescent current
Quiescent current change
8
IO = 20 mA to 1 A
0.5
mA
VI = 12.5 to 30 V, IO = 20 mA
Output voltage drift
IO = 5 mA, TJ = 0 °C to 70 °C
Output noise voltage
B = 10 Hz to 100 kHz
mA
1
-1
mV/°C
65
µV
47(1)
dB
13
V
SVR
Supply voltage rejection
f = 120 Hz
VI
Operating input voltage
IO ≤ 1 A
RO
Output resistance
f = 1 kHz
17
mΩ
Isc
Short circuit current
VI = 27 V
500
mA
Iscp
Short circuit peak current
3
A
1. Guaranteed by design.
12/35
DocID2148 Rev 8
L78S
Electrical characteristics
Refer to the test circuits, TJ = 25 °C, VI = 19 V, IO = 500 mA, unless otherwise specified.
Table 8. Electrical characteristics of L78S12C
Symbol
Parameter
VO
Output voltage
VO
Output voltage
ΔVO
Line regulation
ΔVO
Load regulation
IQ
ΔIQ
ΔVO/ΔT
eN
Test conditions
IO = 1 A, VI = 14.5 V
Min.
Typ.
Max.
Unit
11.5
12
12.5
V
11.4
12
12.6
V
VI = 14.5 to 30 V
240
VI = 16 to 22 V
120
IO = 20 mA to 1.5 A
240
mV
mV
IO = 2 A
150
Quiescent current
Quiescent current change
8
IO = 20 mA to 1 A
0.5
mA
VI = 14.5 to 30 V, IO = 20 mA
Output voltage drift
IO = 5 mA, TJ = 0 °C to 70 °C
Output noise voltage
B =10 Hz to 100 kHz
mA
1
-1
mV/°C
75
µV
47(1)
dB
15
V
SVR
Supply voltage rejection
f = 120 Hz
VI
Operating input voltage
IO ≤ 1 A
RO
Output resistance
f = 1 kHz
18
mΩ
Isc
Short circuit current
VI = 27 V
500
mA
Iscp
Short circuit peak current
3
A
1. Guaranteed by design.
DocID2148 Rev 8
13/35
35
Electrical characteristics
L78S
Refer to the test circuits, TJ = 25 °C, VI = 23 V, IO = 500 mA, unless otherwise specified.
Table 9. Electrical characteristics of L78S15C
Symbol
Parameter
VO
Output voltage
VO
Output voltage
ΔVO
Line regulation
ΔVO
Load regulation
IQ
ΔIQ
ΔVO/ΔT
eN
Test conditions
IO = 1 A, VI = 17.5 V
Min.
Typ.
Max.
Unit
14.4
15
15.6
V
14.25
15
15.75
V
VI = 17.5 to 30 V
300
VI = 20 to 26 V
150
IO = 20 mA to 1.5 A
300
mV
mV
IO = 2 A
150
Quiescent current
Quiescent current change
8
IO = 20 mA to 1 A
0.5
mA
VI = 17.5 to 30 V, IO = 20 mA
Output voltage drift
IO = 5 mA, TJ = 0 °C to 70 °C
Output noise voltage
B =10 Hz to 100 kHz
mA
1
-1
mV/°C
90
µV
46(1)
dB
18
V
SVR
Supply voltage rejection
f = 120 Hz
VI
Operating input voltage
IO ≤ 1 A
RO
Output resistance
f = 1 kHz
19
mΩ
Isc
Short circuit current
VI = 27 V
500
mA
Iscp
Short circuit peak current
3
A
1. Guaranteed by design.
14/35
DocID2148 Rev 8
L78S
Electrical characteristics
Refer to the test circuits, TJ = 25 °C, VI = 26 V, IO = 500 mA, unless otherwise specified.
Table 10. Electrical characteristics of L78S18C
Symbol
Parameter
VO
Output voltage
VO
Output voltage
ΔVO
Line regulation
ΔVO
Load regulation
IQ
ΔIQ
ΔVO/ΔT
eN
Test conditions
IO = 1 A, VI = 20.5 V
Min.
Typ.
Max.
Unit
17.1
18
18.9
V
17
18
19
V
VI = 20.5 to 30 V
360
VI = 22 to 28 V
180
IO = 20 mA to 1.5 A
360
mV
mV
IO = 2 A
200
Quiescent current
Quiescent current change
8
IO = 20 mA to 1 A
0.5
mA
VI = 20.5 to 30 V, IO = 20 mA
Output voltage drift
IO = 5 mA, TJ = 0 °C to 70 °C
Output noise voltage
B =10 Hz to 100 kHz
mA
1
-1
mV/°C
110
µV
43(1)
dB
21
V
SVR
Supply voltage rejection
f = 120 Hz
VI
Operating input voltage
IO ≤ 1 A
RO
Output resistance
f = 1 kHz
22
mΩ
Isc
Short circuit current
VI = 27 V
500
mA
Iscp
Short circuit peak current
3
A
1. Guaranteed by design.
DocID2148 Rev 8
15/35
35
Electrical characteristics
L78S
Refer to the test circuits, TJ = 25 °C, VI = 33 V, IO = 500 mA, unless otherwise specified.
Table 11. Electrical characteristics of L78S24C
Symbol
Parameter
VO
Output voltage
VO
Output voltage
ΔVO
Line regulation
ΔVO
Load regulation
IQ
ΔIQ
ΔVO/ΔT
eN
Test conditions
IO = 1 A, VI = 27 V
Min.
Typ.
Max.
Unit
23
24
25
V
22.8
24
25.2
V
VI = 27 to 38 V
480
VI = 30 to 36 V
240
IO = 20 mA to 1.5 A
480
mV
mV
IO = 2 A
300
Quiescent current
Quiescent current change
8
IO = 20 mA to 1 A
0.5
mA
VI = 27 to 38 V, IO = 20 mA
Output voltage drift
IO = 5 mA, TJ = 0 °C to 70 °C
Output noise voltage
B = 10 Hz to 100 kHz
mA
1
-1.5
mV/°C
170
µV
42(1)
dB
27
V
SVR
Supply voltage rejection
f = 120 Hz
VI
Operating input voltage
IO ≤ 1 A
RO
Output resistance
f = 1 kHz
28
mΩ
Isc
Short circuit current
VI = 27 V
500
mA
Iscp
Short circuit peak current
3
A
1. Guaranteed by design.
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DocID2148 Rev 8
L78S
6
Typical performance
Typical performance
Figure 8. Dropout voltage vs. junction
temperature
Figure 9. Peak output current vs. input/output
differential voltage
Figure 10. Output impedance vs. frequency
Figure 11. Output voltage vs. junction
temperature
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35
Typical performance
L78S
Figure 12. Supply voltage rejection vs.
frequency
Figure 13. Quiescent current vs. junction
temperature
Figure 14. Load transient response
Figure 15. Line transient response
Figure 16. Quiescent current vs. input voltage
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L78S
Typical performance
Figure 17. Fixed output regulator
1. Although no output capacitor is need for stability, it does improve transient response.
2. Required if regulator is located an appreciable distance from power supply filter.
Figure 18. Constant current regulator
4
,2 9;;5,G
Figure 19. Circuit for increasing output voltage
4
,5 Ż,G
92 9;; 55 ,G5
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35
Typical performance
L78S
Figure 20. Adjustable output regulator (7 to 30 V)
Figure 21. 0.5 to 10 V regulator
VO=VXXR4/R1
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L78S
Typical performance
Figure 22. High current voltage regulator
4
9%(4
5 BBBBBBBBBBBBBB
,5(4 ,4E4
9%(4
,2 ,5(*4 ,5(*BBBBB
B
5
Figure 23. High output current with short circuit protection
4
56& 9%(
%(4
4,6&
DocID2148 Rev 8
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Typical performance
L78S
Figure 24. Tracking voltage regulator
4
Figure 25. Positive and negative regulator
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DocID2148 Rev 8
L78S
Typical performance
Figure 26. Negative output voltage circuit
Figure 27. Switching regulator
Figure 28. High input voltage circuit
4
9,1 9, 9=9%(
DocID2148 Rev 8
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35
Typical performance
L78S
Figure 29. High input voltage circuit
4
Figure 30. High output voltage regulator
4
Figure 31. High input and output voltage
4
92 9;;9=
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DocID2148 Rev 8
L78S
Typical performance
Figure 32. Reducing power dissipation with dropping resistor
4
9, PLQ 9;;9'523 PD[
5 BBBB
BBBBBB
BBBBBB
BBBBBB
BBBBBB
BBBB
,2 PD[[ ,G PD[
Figure 33. Remote shutdown
4
DocID2148 Rev 8
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35
Typical performance
L78S
Figure 34. Power AM modulator (unity voltage gain, IO ≤ 1 A)
4
Note:
The circuit performs well up to 100 kHz.
Figure 35. Adjustable output voltage with temperature compensation
4
92 9;; 55 9%(
Note:
26/35
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.
DocID2148 Rev 8
L78S
Typical performance
Figure 36. Light controllers (VOmin = VXX + VBE)
92ULVHVZKHQWKHOLJKWJRHVXS
92IDOOVZKHQWKHOLJKWJRHVXS
Figure 37. Protection against input short-circuit with high capacitance loads
4
1. Application with high capacitance loads and an output voltage greater than 6 volts need an external diode
(see Figure 30 on page 24) to protect the device against input short circuit. In this case the input voltage
falls rapidly while the output voltage decrease slowly. The capacitance discharges by means of the BaseEmitter junction of the series pass transistor in the regulator. If the energy is sufficiently high, the transistor
may be destroyed. The external diode by-passes the current from the IC to ground.
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35
Package mechanical data
7
L78S
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
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L78S
Package mechanical data
Figure 38. TO-220 (dual gauge) drawing
BW\SH$B5HYB7
DocID2148 Rev 8
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35
Package mechanical data
L78S
Table 12. TO-220 (dual gauge) mechanical data
mm
Dim.
Min.
Typ.
A
4.40
4.60
b
0.61
0.88
b1
1.14
1.70
c
0.48
0.70
D
15.25
15.75
D1
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Max.
1.27
E
10
10.40
e
2.40
2.70
e1
4.95
5.15
F
1.23
1.32
H1
6.20
6.60
J1
2.40
2.72
L
13
14
L1
3.50
3.93
L20
16.40
L30
28.90
∅P
3.75
3.85
Q
2.65
2.95
DocID2148 Rev 8
L78S
Package mechanical data
Figure 39. TO-220 SG (single gauge) drawing
BUHY'
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Package mechanical data
L78S
Table 13. TO-220 SG (single gauge) mechanical data
mm
Dim.
Min.
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Typ.
Max.
A
4.40
4.60
b
0.61
0.88
b1
1.14
1.70
c
0.48
0.70
D
15.25
15.75
E
10
10.40
e
2.40
2.70
e1
4.95
5.15
F
0.51
0.60
H1
6.20
6.60
J1
2.40
2.72
L
13
14
L1
3.50
3.93
L20
16.40
L30
28.90
∅P
3.75
3.85
Q
2.65
2.95
DocID2148 Rev 8
L78S
8
Packaging mechanical data
Packaging mechanical data
Figure 40. Tube for TO-220 (dual gauge) (mm.)
Figure 41. Tube for TO-220 (single gauge) (mm.)
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Revision history
9
L78S
Revision history
Table 14. Document revision history
Date
Revision
07-Sep-2006
2
Order codes updated.
20-Mar-2008
3
Added: Table 1 on page 1.
22-Mar-2010
4
Added: Table 20 on page 32, Figure 38 on page 33, Figure 39 on page 34,
Figure 40 and Figure 41 on page 33.
08-Feb-2012
5
Added: order codes L78S05CV-DG, L78S12CV-DG and L78S15CV-DG
Table 13 on page 35.
09-Mar-2012
6
Added: order codes L78S09CV-DG Table 13 on page 35.
15-May-2012
7
Added: order codes L78S75CV-DG and L78S10CV-DG Table 13 on page 35.
8
Part numbers L78Sxx and L78SxxC changed to L78S.
Modified the title, the features and the description in cover page.
Removed TO-3 package.
Updated Table 1: Device summary, Section 2: Pin configuration, Section 3:
Maximum ratings, Section 4: Test circuits, Section 5: Electrical
characteristics,Section 6: Typical performance, Section 7: Package
mechanical data, Section 9: Order codes.
Added Section 8: Packaging mechanical data.
Minor text changes.
10-Mar-2014
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Changes
DocID2148 Rev 8
L78S
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