LM7812CT_12 [FAIRCHILD]

3-Terminal 1A Positive Voltage Regulator; 3端子1A正电压稳压器
LM7812CT_12
型号: LM7812CT_12
厂家: FAIRCHILD SEMICONDUCTOR    FAIRCHILD SEMICONDUCTOR
描述:

3-Terminal 1A Positive Voltage Regulator
3端子1A正电压稳压器

稳压器
文件: 总28页 (文件大小:1820K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
August 2012  
LM78XX/LM78XXA  
3-Terminal 1A Positive Voltage Regulator  
Features  
General Description  
• Output Current up to 1A  
The LM78XX series of three terminal positive regulators  
are available in the TO-220 package and with several  
fixed output voltages, making them useful in a wide  
range of applications. Each type employs internal current  
limiting, thermal shut down and safe operating area pro-  
tection, 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 com-  
ponents to obtain adjustable voltages and currents.  
• Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24  
• Thermal Overload Protection  
• Short Circuit Protection  
• Output Transistor Safe Operating Area Protection  
Ordering Information  
Product Number  
LM7805CT  
Output Voltage Tolerance  
Package  
Operating Temperature  
±4%  
TO-220 (Single Gauge)  
-40C to +125C  
LM7806CT  
LM7808CT  
LM7809CT  
LM7810CT  
LM7812CT  
LM7815CT  
LM7818CT  
LM7824CT  
LM7805ACT  
LM7806ACT  
LM7808ACT  
LM7809ACT  
LM7810ACT  
LM7812ACT  
LM7815ACT  
LM7818ACT  
LM7824ACT  
±2%  
0C to +125C  
© 2012 Fairchild Semiconductor Corporation  
LM78XX/LM78XXA Rev. 1.2  
www.fairchildsemi.com  
1
Block Diagram  
Input  
1
Series Pass  
Element  
Output  
3
Current  
Generator  
SOA  
Protection  
Starting  
Circuit  
Reference  
Voltage  
Error  
Amplifier  
Thermal  
Protection  
GND  
2
Figure 1.  
Pin Assignment  
(Single Gauge)  
TO-220  
GND  
1. Input  
1
2. GND  
3. Output  
Figure 2.  
Absolute Maximum Ratings  
Absolute maximum ratings are those values beyond which damage to the device may occur. The datasheet  
specifications should be met, without exception, to ensure that the system design is reliable over its power supply,  
temperature, and output/input loading variables. Fairchild does not recommend operation outside datasheet  
specifications.  
Symbol  
Parameter  
Value  
Unit  
V
V
Input Voltage  
V = 5V to 18V  
35  
40  
I
O
V = 24V  
V
O
R
Thermal Resistance Junction-Cases (TO-220)  
Thermal Resistance Junction-Air (TO-220)  
5
°C/W  
°C/W  
°C  
θJC  
R
65  
θJA  
T
Operating Temperature  
Range  
LM78xx  
-40 to +125  
0 to +125  
-65 to +150  
OPR  
LM78xxA  
T
Storage Temperature Range  
°C  
STG  
2
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7805)  
Refer to the test circuits. -40°C < T < 125°C, I = 500mA, V = 10V, C = 0.1µF, unless otherwise specified.  
J
O
I
I
Symbol  
Parameter  
Conditions  
Min.  
4.8  
Typ.  
5.0  
Max.  
5.2  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
5mA I 1A, P 15W,  
I
4.75  
5.0  
5.25  
O
O
V = 7V to 20V  
(1)  
Regline Line Regulation  
T = +25°C V = 7V to 25V  
4.0  
1.6  
100  
50.0  
100  
50.0  
8.0  
0.5  
1.3  
mV  
mV  
J
O
V = 8V to 12V  
I
(1)  
Regload Load Regulation  
T = +25°C  
I
= 5mA to 1.5A  
9.0  
J
O
O
I
= 250mA to 750mA  
4.0  
I
Quiescent Current  
T = +25°C  
5.0  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
0.03  
0.3  
Q
O
V = 7V to 25V  
I
(2)  
V /T Output Voltage Drift  
I
= 5mA  
-0.8  
42.0  
73.0  
2.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(2)  
RR  
Ripple Rejection  
Dropout Voltage  
f = 120Hz, V = 8V to 18V  
62.0  
dB  
V
O
V
I
= 1A, T = +25°C  
DROP  
O
J
(2)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
15.0  
230  
2.2  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(2)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
1. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
2. These parameters, although guaranteed, are not 100% tested in production.  
3
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7806) (Continued)  
Refer to the test circuits. -40°C < T < 125°C, I = 500mA, V = 11V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min  
5.75  
5.7  
Typ.  
6.0  
Max.  
6.25  
6.3  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
5mA I 1A, P 15W,  
6.0  
O
O
V = 8.0V to 21V  
I
(3)  
Regline Line Regulation  
T = +25°C V = 8V to 25V  
5.0  
1.5  
9.0  
3.0  
5.0  
120  
60.0  
120  
60.0  
8.0  
0.5  
1.3  
mV  
mV  
J
I
V = 9V to 13V  
I
(3)  
Regload Load Regulation  
T = +25°C  
I
= 5mA to 1.5A  
J
O
O
I
= 250mA to 750mA  
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current  
Change  
I
= 5mA to 1A  
Q
O
V = 8V to 25V  
I
(4)  
V /T Output Voltage Drift  
I
= 5mA  
-0.8  
45.0  
73.0  
2.0  
19.0  
250  
2.2  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(4)  
RR  
Ripple Rejection  
Dropout Voltage  
f = 120Hz, V = 8V to 18V  
62.0  
dB  
V
O
V
I
= 1A, T = +25°C  
DROP  
O
J
(4)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(4)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
3. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
4. These parameters, although guaranteed, are not 100% tested in production.  
4
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7808) (Continued)  
Refer to the test circuits. -40°C < T < 125°C, I = 500mA, V = 14V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
7.7  
7.6  
Typ.  
8.0  
Max.  
8.3  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
5mA I 1A, P 15W,  
8.0  
8.4  
O
O
V = 10.5V to 23V  
I
(5)  
Regline Line Regulation  
T = +25°C V = 10.5V to 25V  
5.0  
2.0  
160  
80.0  
160  
80.0  
8.0  
0.5  
1.0  
mV  
mV  
J
I
V = 11.5V to 17V  
I
(5)  
Regload Load Regulation  
T = +25°C  
I
= 5mA to 1.5A  
10.0  
5.0  
J
O
O
I
= 250mA to 750mA  
I
Quiescent Current  
T = +25°C  
5.0  
mA  
mA  
Q
J
I  
Quiescent Current Change  
I
= 5mA to 1A  
0.05  
0.5  
Q
O
V = 10.5V to 25V  
I
(6)  
V /T Output Voltage Drift  
I
= 5mA  
-0.8  
52.0  
73.0  
2.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(6)  
RR  
Ripple Rejection  
f = 120Hz, V = 11.5V to 21.5V  
56.0  
dB  
V
O
V
Dropout Voltage  
I
= 1A, T = +25°C  
DROP  
O
J
(6)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
17.0  
230  
2.2  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(6)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
5. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
6. These parameters, although guaranteed, are not 100% tested in production.  
5
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7809) (Continued)  
Refer to the test circuits. -40°C < T < 125°C, I = 500mA, V = 15V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
8.65  
8.6  
Typ.  
9.0  
Max.  
9.35  
9.4  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
5mA I 1A, P 15W,  
9.0  
O
O
V = 11.5V to 24V  
I
(7)  
Regline Line Regulation  
T = +25°C V = 11.5V to 25V  
6.0  
2.0  
12.0  
4.0  
5.0  
180  
90.0  
180  
90.0  
8.0  
0.5  
1.3  
mV  
mV  
J
I
V = 12V to 17V  
I
(7)  
Regload Load Regulation  
T = +25°C I = 5mA to 1.5A  
J
O
O
I
= 250mA to 750mA  
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
Q
O
V = 11.5V to 26V  
I
(8)  
V /T Output Voltage Drift  
I
= 5mA  
-1.0  
58.0  
71.0  
2.0  
17.0  
250  
2.2  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(8)  
RR  
Ripple Rejection  
Dropout Voltage  
f = 120Hz, V = 13V to 23V  
56.0  
dB  
V
O
V
I
= 1A, T = +25°C  
DROP  
O
J
(8)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(8)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
7. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
8. These parameters, although guaranteed, are not 100% tested in production.  
6
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7810) (Continued)  
Refer to the test circuits. -40°C < T < 125°C, I = 500mA, V = 16V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
9.6  
Typ.  
10.0  
10.0  
Max.  
10.4  
10.5  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
5mA I 1A, P 15W,  
9.5  
O
O
V = 12.5V to 25V  
I
(9)  
Regline  
Regload  
T = +25°C V = 12.5V to 25V  
10.0  
3.0  
12.0  
4.0  
5.1  
200  
100  
200  
400  
8.0  
0.5  
1.0  
mV  
mV  
J
I
Line Regulation  
V = 13V to 25V  
I
(9)  
T = +25°C  
I
I
= 5mA to 1.5A  
J
O
O
Load Regulation  
= 250mA to 750mA  
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
Q
O
V = 12.5V to 29V  
I
(10)  
V /T  
I
= 5mA  
-1.0  
58.0  
71.0  
2.0  
17.0  
250  
2.2  
mV/°C  
O
O
Output Voltage Drift  
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(10)  
RR  
f = 120Hz, V = 13V to 23V  
56.0  
dB  
V
O
Ripple Rejection  
V
Dropout Voltage  
I
= 1A, T = +25°C  
DROP  
O
J
(10)  
r
f = 1kHz  
V = 35V, T = +25°C  
mΩ  
mA  
A
O
Output Resistance  
I
Short Circuit Current  
SC  
I
A
(10)  
I
T = +25°C  
PK  
Peak Current  
J
Notes:  
9. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
10. These parameters, although guaranteed, are not 100% tested in production.  
7
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7812) (Continued)  
Refer to the test circuits. -40°C < T < 125°C, I = 500mA, V = 19V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
11.5  
11.4  
Typ.  
12.0  
12.0  
Max.  
12.5  
12.6  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
5mA I 1A, P 15W,  
O
O
V = 14.5V to 27V  
I
(11)  
(11)  
Regline Line Regulation  
T = +25°C V = 14.5V to 30V  
10.0  
3.0  
240  
120  
240  
120  
8.0  
0.5  
1.0  
mV  
mV  
J
I
V = 16V to 22V  
I
Regload Load Regulation  
T = +25°C I = 5mA to 1.5A  
11.0  
5.0  
J
O
O
I
= 250mA to 750mA  
I
Quiescent Current  
T = +25°C  
5.1  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
0.1  
Q
O
V = 14.5V to 30V  
0.5  
I
(12)  
V /T Output Voltage Drift  
I
= 5mA  
-1.0  
76.0  
71.0  
2.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(12)  
RR  
Ripple Rejection  
Dropout Voltage  
f = 120Hz, V = 15V to 25V  
55.0  
dB  
V
I
V
I
= 1A, T = +25°C  
DROP  
O
J
(12)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
18.0  
230  
2.2  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(12)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
11. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
12. These parameters, although guaranteed, are not 100% tested in production.  
8
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7815) (Continued)  
Refer to the test circuits. -40°C < T < 125°C, I = 500mA, V = 23V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
14.4  
14.25  
Typ.  
15.0  
15.0  
Max.  
15.6  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
5mA I 1A, P 15W,  
15.75  
O
O
V = 17.5V to 30V  
I
(13)  
(13)  
Regline Line Regulation  
T = +25°C V = 17.5V to 30V  
11.0  
3.0  
12.0  
4.0  
5.2  
300  
150  
300  
150  
8.0  
0.5  
1.0  
mV  
mV  
J
I
V = 20V to 26V  
I
Regload Load Regulation  
T = +25°C  
I
= 5mA to 1.5A  
J
O
O
I
= 250mA to 750mA  
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change  
I
= 5mA to 1A  
Q
O
V = 17.5V to 30V  
I
(14)  
V /T Output Voltage Drift  
I
= 5mA  
-1.0  
90.0  
70.0  
2.0  
19.0  
250  
2.2  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(14)  
RR  
Ripple Rejection  
f = 120Hz, V = 18.5V to 28.5V  
54.0  
dB  
V
I
V
Dropout Voltage  
I
= 1A, T = +25°C  
DROP  
O
J
(14)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(14)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
13. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
14. These parameters, although guaranteed, are not 100% tested in production.  
9
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7818) (Continued)  
Refer to the test circuits. -40°C < T < 125°C, I = 500mA, V = 27V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
17.3  
17.1  
Typ.  
18.0  
18.0  
Max.  
18.7  
18.9  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
5mA I 1A, P 15W,  
O
O
V = 21V to 33V  
I
(15)  
(15)  
Regline Line Regulation  
T = +25°C V = 21V to 33V  
15.0  
5.0  
15.0  
5.0  
5.2  
360  
180  
360  
180  
8.0  
0.5  
1.0  
mV  
mV  
J
I
V = 24V to 30V  
I
Regload Load Regulation  
T = +25°C  
I
I
= 5mA to 1.5A  
J
O
O
= 250mA to 750mA  
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
Q
O
V = 21V to 33V  
I
(16)  
V /T Output Voltage Drift  
I
= 5mA  
-1.0  
110  
69.0  
2.0  
22.0  
250  
2.2  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(16)  
RR  
Ripple Rejection  
Dropout Voltage  
f = 120Hz, V = 22V to 32V  
53.0  
dB  
V
I
V
I
= 1A, T = +25°C  
DROP  
O
J
(16)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(16)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
15. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
16. These parameters, although guaranteed, are not 100% tested in production.  
10  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7824) (Continued)  
Refer to the test circuits. -40°C < T < 125°C, I = 500mA, V = 33V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
23.0  
22.8  
Typ.  
24.0  
24.0  
Max.  
25.0  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
5mA I 1A, P 15W,  
25.25  
O
O
V = 27V to 38V  
I
(17)  
(17)  
Regline Line Regulation  
T = +25°C V = 27V to 38V  
17.0  
6.0  
480  
240  
480  
240  
8.0  
0.5  
1.0  
mV  
mV  
J
I
V = 30V to 36V  
I
Regload Load Regulation  
T = +25°C  
I
I
= 5mA to 1.5A  
15.0  
5.0  
J
O
O
= 250mA to 750mA  
I
Quiescent Current  
T = +25°C  
5.2  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
0.1  
Q
O
V = 27V to 38V  
0.5  
I
(18)  
V /T Output Voltage Drift  
I
= 5mA  
-1.5  
60.0  
67.0  
2.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(18)  
RR  
Ripple Rejection  
Dropout Voltage  
f = 120Hz, V = 28V to 38V  
50.0  
dB  
V
I
V
I
= 1A, T = +25°C  
DROP  
O
J
(18)  
rO  
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
28.0  
230  
2.2  
mΩ  
mA  
A
I
Short Circuit Current  
SC  
I
A
(18)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
17. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
18. These parameters, although guaranteed, are not 100% tested in production.  
11  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7805A) (Continued)  
Refer to the test circuits. 0°C < T < 125°C, I = 1A, V = 10V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
4.9  
Typ.  
5.0  
Max.  
5.1  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
I
= 5mA to 1A, P 15W,  
4.8  
5.0  
5.2  
O
O
V = 7.5V to 20V  
I
(19)  
Regline Line Regulation  
Regload Load Regulation  
V = 7.5V to 25V, I = 500mA  
5.0  
3.0  
5.0  
1.5  
9.0  
9.0  
4.0  
5.0  
50.0  
50.0  
50.0  
25.0  
100  
100  
50.0  
6.0  
0.5  
0.8  
0.8  
mV  
mV  
I
O
V = 8V to 12V  
I
T = +25°C  
V = 7.3V to 20V  
I
J
V = 8V to 12V  
I
(19)  
T = +25°C, I = 5mA to 1.5A  
J
O
I
I
= 5mA to 1A  
O
= 250mA to 750mA  
O
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current  
Change  
I = 5mA to 1A  
O
Q
V = 8V to 25V, I = 500mA  
I
O
V = 7.5V to 20V, T = +25°C  
I
J
(20)  
V /T Output Voltage Drift  
I
= 5mA  
-0.8  
10.0  
68.0  
2.0  
17.0  
250  
2.2  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(20)  
RR  
Ripple Rejection  
Dropout Voltage  
f = 120Hz, I = 500mA, V = 8V to 18V  
dB  
V
O
I
V
I
= 1A, T = +25°C  
DROP  
O
J
(20)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(20)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
19. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
20. These parameters, although guaranteed, are not 100% tested in production.  
12  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7806A) (Continued)  
Refer to the test circuits. 0°C < T < 125°C, I = 1A, V = 11V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
5.58  
5.76  
Typ.  
6.0  
Max.  
6.12  
6.24  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
I
= 5mA to 1A, P 15W,  
6.0  
O
O
V = 8.6V to 21V  
I
(21)  
Regline Line Regulation  
V = 8.6V to 25V, I = 500mA  
5.0  
3.0  
5.0  
1.5  
9.0  
9.0  
5.0  
4.3  
60.0  
60.0  
60.0  
30.0  
100  
100  
50.0  
6.0  
0.5  
0.8  
0.8  
mV  
mV  
I
O
V = 9V to 13V  
I
T = +25°C V = 8.3V to 21V  
J
I
V = 9V to 13V  
I
(21)  
Regload Load Regulation  
T = +25°C, I = 5mA to 1.5A  
J
O
I
I
= 5mA to 1A  
O
= 250mA to 750mA  
O
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
Q
O
V = 19V to 25V, I = 500mA  
I
O
V = 8.5V to 21V, T = +25°C  
I
J
(22)  
V /T Output Voltage Drift  
I
= 5mA  
-0.8  
10.0  
65.0  
2.0  
17.0  
250  
2.2  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(22)  
RR  
Ripple Rejection  
Dropout Voltage  
f = 120Hz, I = 500mA, V = 9V to 19V  
dB  
V
O
I
V
I
= 1A, T = +25°C  
DROP  
O
J
(22)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(22)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
21. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
22. These parameters, although guaranteed, are not 100% tested in production.  
13  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7808A) (Continued)  
Refer to the test circuits. 0°C < T < 125°C, I = 1A, V = 14V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
7.84  
7.7  
Typ.  
8.0  
Max.  
8.16  
8.3  
Unit  
V
Output Voltage  
T = +25°C  
V
O
J
I
= 5mA to 1A, P 15W,  
8.0  
O
O
V = 10.6V to 23V  
I
(23)  
Regline Line Regulation  
V = 10.6V to 25V, I = 500mA  
6.0  
3.0  
6.0  
2.0  
12.0  
12.0  
5.0  
5.0  
80.0  
80.0  
80.0  
40.0  
100  
100  
50.0  
6.0  
0.5  
0.8  
0.8  
mV  
mV  
I
O
V = 11V to 17V  
I
T = +25°C  
V = 10.4V to 23V  
I
J
V = 11V to 17V  
I
(23)  
Regload Load Regulation  
T = +25°C, I = 5mA to 1.5A  
J
O
I
I
= 5mA to 1A  
O
= 250mA to 750mA  
O
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
Q
O
V = 11V to 25V, I = 500mA  
I
O
V = 10.6V to 23V, T = +25°C  
I
J
(24)  
V /T Output Voltage Drift  
I
= 5mA  
-0.8  
10.0  
62.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(24)  
RR  
Ripple Rejection  
f = 120Hz, I = 500mA,  
dB  
O
V = 11.5V to 21.5V  
I
V
Dropout Voltage  
I
= 1A, T = +25°C  
2.0  
18.0  
250  
2.2  
V
mΩ  
mA  
A
DROP  
O
J
(24)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
O
I
Short Circuit Current  
SC  
I
A
(24)  
I
Peak Current  
T = +25°C  
J
PK  
Notes:  
23. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
24. These parameters, although guaranteed, are not 100% tested in production.  
14  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7809A) (Continued)  
Refer to the test circuits. 0°C < T < 125°C, I = 1A, V = 15V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
8.82  
8.65  
Typ.  
9.0  
Max.  
9.16  
9.35  
Units  
V
Output Voltage  
T = +25°C  
V
O
J
I
= 5mA to 1A, P 15W,  
9.0  
O
O
V = 11.2V to 24V  
I
(25)  
Regline Line Regulation  
V = 11.7V to 25V, I = 500mA  
6.0  
4.0  
6.0  
2.0  
12.0  
12.0  
5.0  
5.0  
90.0  
45.0  
90.0  
45.0  
100  
100  
50.0  
6.0  
0.5  
0.8  
0.8  
mV  
mV  
I
O
V = 12.5V to 19V  
I
T = +25°C V = 11.5V to 24V  
J
I
V = 12.5V to 19V  
I
(25)  
Regload Load Regulation  
T = +25°C, I = 5mA to 1.5A  
J
O
I
= 5mA to 1A  
O
I
= 250mA to 750mA  
O
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
Q
O
V = 12V to 25V, I = 500mA  
I
O
V = 11.7V to 25V, T = +25°C  
I
J
(26)  
V /T Output Voltage Drift  
I
= 5mA  
-1.0  
10.0  
62.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(26)  
RR  
Ripple Rejection  
f = 120Hz, I = 500mA,  
dB  
O
V = 12V to 22V  
I
V
Dropout Voltage  
I
= 1A, T = +25°C  
2.0  
17.0  
250  
2.2  
V
mΩ  
mA  
A
DROP  
O
J
(26)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
O
I
Short Circuit Current  
SC  
I
A
(26)  
I
Peak Current  
T = +25°C  
J
PK  
Notes:  
25. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
26. These parameters, although guaranteed, are not 100% tested in production.  
15  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7810A) (Continued)  
Refer to the test circuits. 0°C < T < 125°C, I = 1A, V = 16V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
9.8  
Typ.  
10.0  
10.0  
Max.  
10.2  
10.4  
Units  
V
Output Voltage  
T = +25°C  
V
O
J
I
= 5mA to 1A, P 15W,  
9.6  
O
O
V = 12.8V to 25V  
I
(27)  
Regline Line Regulation  
Regload Load Regulation  
V = 12.8V to 26V, I = 500mA  
8.0  
4.0  
8.0  
3.0  
12.0  
12.0  
5.0  
5.0  
100  
50.0  
100  
50.0  
100  
100  
50.0  
6.0  
0.5  
0.8  
0.5  
mV  
mV  
I
O
V = 13V to 20V  
I
T = +25°C  
V = 12.5V to 25V  
I
J
V = 13V to 20V  
I
(27)  
T = +25°C, I = 5mA to 1.5A  
J
O
I
I
= 5mA to 1A  
O
= 250mA to 750mA  
O
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current  
Change  
I = 5mA to 1A  
O
Q
V = 12.8V to 25V, I = 500mA  
I
O
V = 13V to 26V, T = +25°C  
I
J
(28)  
V /T Output Voltage Drift  
I
= 5mA  
-1.0  
10.0  
62.0  
2.0  
17.0  
250  
2.2  
mV/°C  
O
O
V
Output Noise Voltage f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(28)  
RR  
Ripple Rejection  
Dropout Voltage  
Output Resistance  
f = 120Hz, I = 500mA, V = 14V to 24V  
dB  
V
O
I
V
I
= 1A, T = +25°C  
DROP  
O
J
(28)  
r
f = 1kHz  
V = 35V, T = +25°C  
mΩ  
mA  
A
O
I
Short Circuit Current  
SC  
I
A
(28)  
I
Peak Current  
T = +25°C  
PK  
J
Notes:  
27. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
28. These parameters, although guaranteed, are not 100% tested in production.  
16  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7812A) (Continued)  
Refer to the test circuits. 0°C < T < 125°C, I = 1A, V = 19V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
11.75  
11.5  
Typ.  
12.0  
12.0  
Max.  
12.25  
12.5  
Units  
V
Output Voltage  
T = +25°C  
V
O
J
I
= 5mA to 1A, P 15W,  
O
V = 14.8V to 27V  
O
I
(29)  
Regline Line Regulation  
V = 14.8V to 30V, I = 500mA  
10.0  
4.0  
10.0  
3.0  
12.0  
12.0  
5.0  
5.1  
120  
120  
120  
60.0  
100  
100  
50.0  
6.0  
0.5  
0.8  
0.8  
mV  
mV  
I
O
V = 16V to 22V  
I
T = +25°C V = 14.5V to 27V  
J
I
V = 16V to 22V  
I
(29)  
Regload Load Regulation  
T = +25°C, I = 5mA to 1.5A  
J
O
I
I
= 5mA to 1A  
O
= 250mA to 750mA  
O
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
Q
O
V = 14V to 27V, I = 500mA  
I
O
V = 15V to 30V, T = +25°C  
I
J
(30)  
V /T Output Voltage Drift  
I
= 5mA  
-1.0  
10.0  
60.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(30)  
RR  
Ripple Rejection  
f = 120Hz, I = 500mA,  
dB  
O
V = 14V to 24V  
I
V
Dropout Voltage  
I
= 1A, T = +25°C  
2.0  
18.0  
250  
2.2  
V
mΩ  
mA  
A
DROP  
O
J
(30)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
O
I
Short Circuit Current  
SC  
I
A
(30)  
I
Peak Current  
T = +25°C  
J
PK  
Note:  
29. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
30. These parameters, although guaranteed, are not 100% tested in production.  
17  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7815A) (Continued)  
Refer to the test circuits. 0°C < T < 125°C, I = 1A, V = 23V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
14.75  
14.4  
Typ.  
15.0  
15.0  
Max.  
15.3  
15.6  
Units  
V
Output Voltage  
T = +25°C  
V
O
J
I
= 5mA to 1A, P 15W,  
O
V = 17.7V to 30V  
O
I
(31)  
Regline Line Regulation  
V = 17.4V to 30V, I = 500mA  
10.0  
5.0  
11.0  
3.0  
12.0  
12.0  
5.0  
5.2  
150  
150  
150  
75.0  
100  
100  
50.0  
6.0  
0.5  
0.8  
0.8  
mV  
mV  
I
O
V = 20V to 26V  
I
T = +25°C V = 17.5V to 30V  
J
I
V = 20V to 26V  
I
(31)  
Regload Load Regulation  
T = +25°C, I = 5mA to 1.5A  
J
O
I
I
= 5mA to 1A  
O
= 250mA to 750mA  
O
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
Q
O
V = 17.5V to 30V, I = 500mA  
I
O
V = 17.5V to 30V, T = +25°C  
I
J
(32)  
V /T Output Voltage Drift  
I
= 5mA  
-1.0  
10.0  
58.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(32)  
RR  
Ripple Rejection  
f = 120Hz, I = 500mA,  
dB  
O
V = 18.5V to 28.5V  
I
V
Dropout Voltage  
I
= 1A, T = +25°C  
2.0  
19.0  
250  
2.2  
V
mΩ  
mA  
A
DROP  
O
J
(32)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
O
I
Short Circuit Current  
SC  
I
A
(32)  
I
Peak Current  
T = +25°C  
J
PK  
Notes:  
31. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
32. These parameters, although guaranteed, are not 100% tested in production.  
18  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7818A) (Continued)  
Refer to the test circuits. 0°C < T < 125°C, I = 1A, V = 27V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
17.64  
17.3  
Typ.  
18.0  
18.0  
Max.  
18.36  
18.7  
Units  
V
Output Voltage  
T = +25°C  
V
O
J
I
= 5mA to 1A, P 15W,  
O
V = 21V to 33V  
O
I
(33)  
Regline Line Regulation  
V = 21V to 33V, I = 500mA  
15.0  
5.0  
15.0  
5.0  
15.0  
15.0  
7.0  
5.2  
180  
180  
180  
90.0  
100  
100  
50.0  
6.0  
0.5  
0.8  
0.8  
mV  
mV  
I
O
V = 21V to 33V  
I
T = +25°C V = 20.6V to 33V  
J
I
V = 24V to 30V  
I
(33)  
Regload Load Regulation  
T = +25°C, I = 5mA to 1.5A  
J
O
I
I
= 5mA to 1A  
O
= 250mA to 750mA  
O
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change  
I = 5mA to 1A  
O
Q
V = 12V to 33V, I = 500mA  
I
O
V = 12V to 33V, T = +25°C  
I
J
(34)  
V /T Output Voltage Drift  
I
= 5mA  
-1.0  
10.0  
57.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(34)  
RR  
Ripple Rejection  
f = 120Hz, I = 500mA,  
dB  
O
V = 22V to 32V  
I
V
Dropout Voltage  
I
= 1A, T = +25°C  
2.0  
19.0  
250  
2.2  
V
mΩ  
mA  
A
DROP  
O
J
(34)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
O
I
Short Circuit Current  
SC  
I
A
(34)  
I
Peak Current  
T = +25°C  
J
PK  
Notes:  
33. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
34. These parameters, although guaranteed, are not 100% tested in production.  
19  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Electrical Characteristics (LM7824A) (Continued)  
Refer to the test circuits. 0°C < T < 125°C, I = 1A, V = 33V, C = 0.33µF, C = 0.1µF, unless otherwise specified.  
J
O
I
I
O
Symbol  
Parameter  
Conditions  
Min.  
23.5  
23.0  
Typ.  
24.0  
24.0  
Max. Units  
V
Output Voltage  
T = +25°C  
24.5  
25.0  
V
O
J
I
= 5mA to 1A, P 15W,  
O
V = 27.3V to 38V  
O
I
(35)  
Regline Line Regulation  
V = 27V to 38V, I = 500mA  
18.0  
6.0  
18.0  
6.0  
15.0  
15.0  
7.0  
5.2  
240  
240  
240  
120  
100  
100  
50.0  
6.0  
0.5  
0.8  
0.8  
mV  
I
O
V = 21V to 33V  
I
T = +25°C  
V = 26.7V to 38V  
I
J
V = 30V to 36V  
I
(35)  
Regload Load Regulation  
T = +25°C, I = 5mA to 1.5A  
mV  
J
O
I
I
= 5mA to 1A  
O
= 250mA to 750mA  
O
I
Quiescent Current  
T = +25°C  
mA  
mA  
Q
J
I  
Quiescent Current Change I = 5mA to 1A  
Q
O
V = 27.3V to 38V, I = 500mA  
I
O
V = 27.3V to 38V, T = +25°C  
I
J
(36)  
V /T  
Output Voltage Drift  
I
= 5mA  
-1.5  
10.0  
54.0  
mV/°C  
O
O
V
Output Noise Voltage  
f = 10Hz to 100kHz, T = +25°C  
µV/V  
N
A
O
(36)  
RR  
Ripple Rejection  
f = 120Hz, I = 500mA,  
dB  
O
V = 28V to 38V  
I
V
Dropout Voltage  
I
= 1A, T = +25°C  
2.0  
20.0  
250  
2.2  
V
mΩ  
mA  
A
DROP  
O
J
(36)  
r
Output Resistance  
f = 1kHz  
V = 35V, T = +25°C  
O
I
Short Circuit Current  
SC  
I
A
(36)  
I
Peak Current  
T = +25°C  
J
PK  
Notes:  
35. Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must  
O
be taken into account separately. Pulse testing with low duty is used.  
36. These parameters, although guaranteed, are not 100% tested in production.  
20  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Typical Performance Characteristics  
6
3
2.5  
2
VI = 10V  
VO = 5V  
IO = 5mA  
TJ = 25°C  
VO = 100mV  
5.75  
5.5  
5.25  
5
1.5  
1
4.75  
4.5  
.5  
0
-50  
-25  
0
25  
50  
75  
100 125  
0
5
10  
15  
20  
25  
30  
35  
JUNCTION TEMPERATURE (°C)  
INPUT-OUTPUT DIFFERENTIAL (V)  
Figure 3. Quiescent Current  
Figure 4. Peak Output Current  
1.02  
7
VI – VO = 5V  
IO = 5mA  
TJ = 25°C  
VO = 5V  
IO = 10mA  
6.5  
6
1.01  
1
5.5  
5
0.99  
0.98  
4.5  
4
-50  
-25  
0
25  
50  
75  
100 125  
5
10  
15  
20  
25  
30  
35  
JUNCTION TEMPERATURE (°C)  
INPUT VOLTAGE (V)  
Figure 5. Output Voltage  
Figure 6. Quiescent Current  
21  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Typical Applications  
3
1
LM78XX  
Output  
Input  
2
C
C
O
0.1µF  
I
0.33µF  
Figure 7. DC Parameters  
1
3
LM78XX  
Input  
Output  
270pF  
2
R
L
V
O
0V  
2N6121  
or EQ  
V
O
0.33µF  
30µS  
100Ω  
Figure 8. Load Regulation  
5.1Ω  
1
3
LM78XX  
Input  
Output  
R
2
L
0.33µF  
470µF  
120Hz  
+
Figure 9. Ripple Rejection  
22  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
3
1
LM78XX  
Output  
Input  
2
C
C
O
0.1µF  
I
0.33µF  
Figure 10. Fixed Output Regulator  
3
1
Output  
LM78XX  
Input  
2
C
V
R
C
O
0.1µF  
XX  
I
0.33µF  
R
1
I
Q
I
O
L
V
XX  
I =  
+
I
Q
O
R
1
Notes:  
1. To specify an output voltage, substitute voltage value for “XX.” A common ground is required between the input and the  
output voltage. The input voltage must remain typically 2.0V above the output voltage even during the low point on the input  
ripple voltage.  
2. C is required if regulator is located an appreciable distance from power supply filter.  
I
3. C improves stability and transient response.  
O
Figure 11.  
Output  
3
1
LM78XX  
Input  
V
XX  
2
C
C
O
0.1µF  
I
R1  
R2  
0.33µF  
I
Q
I
V
5 I  
Q
RI  
O
= V (1+R /R )+I R  
XX 2 1 Q 2  
Figure 12. Circuit for Increasing Output Voltage  
23  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Output  
Input  
1
3
LM7805  
2
C
-
O
C
2
3
0.33µF  
I
6
LM741  
0.1µF  
10kΩ  
+
4
I
V
5 I  
Q
RI  
O
= V (1+R /R )+I R  
XX 2 1 Q 2  
Figure 13. Adjustable Output Regulator (7V to 30V)  
Q1 BD536  
IQ1  
Input  
Output  
R1  
1
3
LM78XX  
3Ω  
I
O
IREG  
0.33µF  
2
V
BEQ1  
0.1µF  
R1 =  
I
–I /B  
REG Q1 Q1  
I
= I  
+ B (I  
–V  
/R )  
O
REG  
Q1 REG  
BEQ1 1  
Figure 14. High Current Voltage Regulator  
Q1  
Input  
R
SC  
Q2  
R1  
Output  
1
3
LM78XX  
3Ω  
2
0.1µF  
0.33µF  
Q1 = TIP42  
Q2 = TIP42  
V
BEQ2  
R
=
SC  
I
SC  
Figure 15. High Output Current with Short Circuit Protection  
24  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
3
1
LM78XX  
V
V
O
I
2
0.33µF  
0.1µF  
4.7kΩ  
4.7kΩ  
COMMON  
7
2
_
COMMON  
6
LM741  
+
3
4
-V  
-V  
IN  
TIP42  
O
Figure 16.Tracking Voltage Regulator  
1
3
LM7815  
+20V  
+15V  
2
0.33µF  
0.1µF  
1N4001  
1N4001  
2.2µF  
2
+
1µF  
+
1
3
MC7915  
-20V  
-15V  
Figure 17. Split Power Supply ( 15V ꢀ 1A)  
25  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Output  
Input  
+
0.1µF  
2
1
3
LM78XX  
Figure 18. Negative Output Voltage Circuit  
D45H11  
1mH  
Input  
Output  
470Ω  
4.7Ω  
Z1  
3
1
LM78XX  
2
+
0.33µF  
10µF  
+
0.5Ω  
2000µF  
Figure 19. Switching Regulator  
26  
www.fairchildsemi.com  
LM78XX/LM78XXA Rev. 1.2  
Mechanical Dimensions  
Dimensions in millimeters  
TO-220 [ SINGLE GAUGE ]  
© 2012 Fairchild Semiconductor Corporation  
LM78XX/LM78XXA Rev. 1.2  
www.fairchildsemi.com  
27  
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