L78M06ABDT [STMICROELECTRONICS]

PRECISION 500mA REGULATORS; 精密500毫安稳压器
L78M06ABDT
型号: L78M06ABDT
厂家: ST    ST
描述:

PRECISION 500mA REGULATORS
精密500毫安稳压器

线性稳压器IC 调节器 电源电路 输出元件
文件: 总17页 (文件大小:1477K)
中文:  中文翻译
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L78M00AB/AC  
SERIES  
PRECISION 500mA REGULATORS  
OUTPUT CURRENT TO 0.5A  
OUTPUT VOLTAGES OF 5; 6; 8; 9; 10; 12;  
15; 18; 20; 24V  
THERMAL OVERLOAD PROTECTION  
SHORT CIRCUIT PROTECTION  
OUTPUT TRANSITION SOA PROTECTION  
±2% OUTPUT VOLTAGE TOLERANCE  
GUARANTEED IN EXTENDED  
TEMPERATURE RANGE  
TO-220  
DESCRIPTION  
The L78M00AB series of three-terminal positive  
regulators is available in TO-220 and DPAK  
packages and with 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  
employs internal current limiting, thermal  
shut-down and safe area protection, making it  
essentially indestructible. If adequate heat sinking  
is provided, they can deliver over 0.5A output  
current. Although designed primarily as fixed  
DPAK  
voltage regulators, these devices can be used  
with external components to obtain adjustable  
voltage and currents.  
SCHEMATIC DIAGRAM  
October 2003  
1/17  
L78M00AB/AC SERIES  
ABSOLUTE MAXIMUM RATINGS  
Symbol  
Parameter²  
Value  
Unit  
DC Input Voltage  
for V = 5 to 18V  
35  
O
V
V
I
for V = 20, 24V  
40  
O
I
Output Current  
Internally Limited  
Internally Limited  
O
P
T
Power Dissipation  
tot  
Storage Temperature Range  
-65 to +150  
0 to 125  
°C  
°C  
stg  
Operating Junction Temperature for L78M00AC  
Range  
T
op  
for L78M00AB  
-40 to 125  
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is  
not implied.  
THERMAL DATA  
Symbol  
Parameter  
Thermal Resistance Junction-case  
Thermal Resistance Junction-ambient  
TO-220  
DPAK  
Unit  
R
MAX  
MAX  
3
8
°C/W  
°C/W  
thj-case  
R
50  
100  
thj-amb  
SHEMATIC DIAGRAM  
2/17  
L78M00AB/AC SERIES  
CONNECTION DIAGRAM (top view)  
TO-220  
DPAK  
ORDERING CODES  
TYPE  
TO-220  
DPAK (*)  
OUTPUT VOLTAGE  
L78M05AB  
L78M05AC  
L78M06AB  
L78M06AC  
L78M08AB  
L78M08AC  
L78M09AB  
L78M09AC  
L78M10AB  
L78M10AC  
L78M12AB  
L78M12AC  
L78M15AB  
L78M15AC  
L78M18AB  
L78M18AC  
L78M20AB  
L78M20AC  
L78M24AB  
L78M24AC  
L78M05ABV  
L78M06ABV  
L78M08ABV  
L78M09ABV  
L78M10ABV  
L78M12ABV  
L78M15ABV  
L78M18ABV  
L78M20ABV  
L78M24ABV  
L78M05ABDT  
L78M05ACDT  
L78M06ABDT  
L78M06ACDT  
L78M08ABDT  
L78M08ACDT  
L78M09ABDT  
L78M09ACDT  
L78M10ABDT  
L78M10ACDT  
L78M12ABDT  
L78M12ACDT  
L78M15ABDT  
L78M15ACDT  
L78M18ABDT  
L78M18ACDT  
L78M20ABDT  
L78M20ACDT  
L78M24ABDT  
L78M24ACDT  
5 V  
5 V  
6 V  
6 V  
8 V  
8 V  
9 V  
9 V  
10 V  
10 V  
12 V  
12 V  
15 V  
15 V  
18 V  
18 V  
20 V  
20 V  
24 V  
24 V  
(*) Available in Tape & Reel with the suffix "-TR".  
APPLICATION CIRCUITS  
3/17  
L78M00AB/AC SERIES  
TEST CIRCUITS  
Figure 1 : DC Parameter  
Figure 2 : Load Regulation  
Figure 3 : Ripple Rejection  
4/17  
L78M00AB/AC SERIES  
ELECTRICAL CHARACTERISTICS OF L78M05XX (refer to the test circuits, V = 10V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
4.9  
Typ.  
Max.  
5.1  
5.2  
100  
50  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
5
5
O
O
J
I
= 5 to 350 mA  
V = 7 to 20 V  
4.8  
V
O
I
V  
V = 7 to 25 V, I = 200 mA  
T = 25°C  
mV  
O
I
O
J
V = 8 to 25 V, I = 200 mA  
T = 25°C  
J
I
O
O
O
V  
Load Regulation  
I
I
= 5 to 500 mA  
T = 25°C  
100  
50  
mV  
O
J
= 5 to 200 mA  
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
6
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5 mA  
0.5  
0.8  
d
O
O
O
V = 8 to 25 V  
I
V /T Output Voltage Drift  
-0.5  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 8 to 18 V  
f = 120Hz  
62  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
T = 25°C  
40  
2
µV  
V
J
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
300  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
ELECTRICAL CHARACTERISTICS OF L78M06XX (refer to the test circuits, V = 11V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
5.88  
5.75  
Typ.  
Max.  
6.12  
6.3  
100  
30  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
6
6
O
O
J
I
= 5 to 350 mA  
V = 8 to 21 V  
V
O
I
V  
V = 8 to 25 V, I = 200 mA  
T = 25°C  
mV  
O
I
O
J
V = 9 to 25 V, I = 200 mA  
T = 25°C  
J
I
O
O
O
V  
Load Regulation  
I
I
= 5 to 500 mA  
T = 25°C  
120  
60  
mV  
O
J
= 5 to 200 mA  
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
6
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5 mA  
0.5  
0.8  
d
O
O
O
V = 9 to 25 V  
I
V /T Output Voltage Drift  
-0.5  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 9 to 19 V  
f = 120Hz  
59  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
45  
2
µV  
V
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
270  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
5/17  
L78M00AB/AC SERIES  
ELECTRICAL CHARACTERISTICS OF L78M08XX (refer to the test circuits, V = 14V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
7.84  
7.7  
Typ.  
Max.  
8.16  
8.3  
100  
30  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
8
8
O
O
J
I
= 5 to 350 mA  
V = 10.5 to 23 V  
V
O
I
V  
V = 10.5 to 25 V, I = 200 mA T = 25°C  
mV  
O
I
O
J
V = 11 to 25 V, I = 200 mA  
T = 25°C  
J
I
O
O
O
V  
Load Regulation  
I
I
= 5 to 500 mA  
= 5 to 200 mA  
T = 25°C  
160  
80  
mV  
O
J
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
6
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5 mA  
0.5  
0.8  
d
O
O
O
V = 10.5 to 25 V  
I
V /T Output Voltage Drift  
-0.5  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 11.5 to 21.5 V f = 120Hz  
56  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
T = 25°C  
52  
2
µV  
V
J
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
250  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
ELECTRICAL CHARACTERISTICS OF L78M09XX (refer to the test circuits, V = 14V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
8.82  
8.64  
Typ.  
Max.  
9.18  
9.36  
100  
30  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
9
9
O
O
J
I
= 5 to 350 mA  
V = 11.5 to 24 V  
V
O
I
V  
V = 11.5 to 25 V, I = 200 mA T = 25°C  
mV  
O
I
O
J
V = 12 to 25 V, I = 200 mA  
T = 25°C  
J
I
O
O
O
V  
Load Regulation  
I
I
= 5 to 500 mA  
= 5 to 200 mA  
T = 25°C  
180  
90  
mV  
O
J
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
6
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5 mA  
0.5  
0.8  
d
O
O
O
V = 11.5 to 25 V  
I
V /T Output Voltage Drift  
-0.5  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 12.5 to 23 V  
f = 120Hz  
56  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
T = 25°C  
52  
2
µV  
V
J
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
250  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
6/17  
L78M00AB/AC SERIES  
ELECTRICAL CHARACTERISTICS OF L78M10XX (refer to the test circuits, V = 16V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
9.8  
Typ.  
10  
Max.  
10.2  
10.4  
100  
30  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
J
O
O
I
= 5 to 350 mA  
V = 12.5 to 25 V  
9.6  
10  
V
O
I
V  
V = 12.5 to 30 V, I = 200 mA T = 25°C  
mV  
O
I
O
J
V = 13 to 30 V, I = 200 mA  
T = 25°C  
J
I
O
O
O
V  
Load Regulation  
I
I
= 5 to 500 mA  
= 5 to 200 mA  
T = 25°C  
200  
100  
6
mV  
O
J
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5mA  
0.5  
d
O
O
O
V = 12.5 to 30 V  
0.8  
I
V /T Output Voltage Drift  
-0.5  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 13.5 to 24 V  
f = 120Hz  
56  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
T = 25°C  
64  
2
µV  
V
J
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
245  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
ELECTRICAL CHARACTERISTICS OF L78M12XX (refer to the test circuits, V = 19V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
11.75  
11.5  
Typ.  
12  
Max.  
12.25  
12.5  
100  
30  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
J
O
O
I
= 5 to 350 mA  
V = 14.5 to 27 V  
12  
V
O
I
V  
V = 14.5 to 30 V, I = 200 mA T = 25°C  
mV  
O
I
O
J
V = 16 to 30 V, I = 200 mA  
T = 25°C  
J
I
O
O
O
V  
Load Regulation  
I
I
= 5 to 500 mA  
= 5 to 200 mA  
T = 25°C  
240  
120  
6
mV  
O
J
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5 mA  
0.5  
d
O
O
O
V = 14.5 to 30 V  
0.8  
I
V /T Output Voltage Drift  
-1  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 15 to 25 V  
f = 120Hz  
55  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
T = 25°C  
75  
2
µV  
V
J
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
240  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
7/17  
L78M00AB/AC SERIES  
ELECTRICAL CHARACTERISTICS OF L78M15XX (refer to the test circuits, V = 23V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
14.7  
14.4  
Typ.  
15  
Max.  
15.3  
15.6  
100  
30  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
J
O
O
I
= 5 to 350 mA  
V = 17.5 to 30 V  
15  
V
O
I
V  
V = 17.5 to 30 V, I = 200 mA T = 25°C  
mV  
O
I
O
J
V = 20 to 30 V, I = 200 mA  
T = 25°C  
J
I
O
O
O
V  
Load Regulation  
I
I
= 5 to 500 mA  
= 5 to 200 mA  
T = 25°C  
300  
150  
6
mV  
O
J
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5 mA  
0.5  
d
O
O
O
V = 17.5 to 30 V  
0.8  
I
V /T Output Voltage Drift  
-1  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 22 to 32 V  
f = 120Hz  
54  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
T = 25°C  
90  
2
µV  
V
J
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
240  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
ELECTRICAL CHARACTERISTICS OF L78M18XX (refer to the test circuits, V = 26V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
17.64  
17.3  
Typ.  
18  
Max.  
18.36  
18.7  
100  
30  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
J
O
O
I
= 5 to 350 mA  
V = 20.5 to 33 V  
18  
V
O
I
V  
V = 21 to 33 V, I = 200 mA T = 25°C  
mV  
O
I
O
J
V = 24 to 33 V, I = 200 mA T = 25°C  
I
O
O
O
J
V  
Load Regulation  
I
I
= 5 to 500 mA  
= 5 to 200 mA  
T = 25°C  
360  
180  
6
mV  
O
J
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5 mA  
0.5  
d
O
O
O
V = 21 to 33 V  
0.8  
I
V /T Output Voltage Drift  
-1.1  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 22 to 32 V  
f = 120Hz  
53  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
T = 25°C  
100  
2
µV  
V
J
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
240  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
8/17  
L78M00AB/AC SERIES  
ELECTRICAL CHARACTERISTICS OF L78M20XX (refer to the test circuits, V = 29V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
19.6  
19.2  
Typ.  
20  
Max.  
20.4  
20.8  
100  
30  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
J
O
O
I
= 5 to 350 mA  
V = 23 to 35 V  
20  
V
O
I
V  
V = 23 to 35 V, I = 200 mA T = 25°C  
mV  
O
I
O
J
V = 24 to 35 V, I = 200 mA T = 25°C  
I
O
O
O
J
V  
Load Regulation  
I
I
= 5 to 500 mA  
= 5 to 200 mA  
T = 25°C  
400  
200  
6
mV  
O
J
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5 mA  
0.5  
d
O
O
O
V = 23 to 35 V  
0.8  
I
V /T Output Voltage Drift  
-1.1  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 24 to 34 V  
f = 120Hz  
53  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
T = 25°C  
110  
2
µV  
V
J
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
240  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
ELECTRICAL CHARACTERISTICS OF L78M24XX (refer to the test circuits, V = 33V, I = 350 mA,  
I
O
C = 0.33 µF, C = 0.1 µF, T = -40 to 125°C (AB), T = 0 to 125°C (AC) unless otherwise specified)  
I
O
J
J
Symbol  
Parameter  
Test Conditions  
Min.  
23.5  
23  
Typ.  
24  
Max.  
24.5  
25  
Unit  
V
V
V
Output Voltage  
Output Voltage  
Line Regulation  
T = 25°C  
J
O
O
I
= 5 to 350 mA  
V = 27 to 38 V  
24  
V
O
I
V  
V = 27 to 38 V, I = 200 mA T = 25°C  
100  
30  
mV  
O
I
O
J
V = 28 to 38 V, I = 200 mA T = 25°C  
I
O
O
O
J
V  
Load Regulation  
I
I
= 5 to 500 mA  
= 5 to 200 mA  
T = 25°C  
480  
240  
6
mV  
O
J
T = 25°C  
J
I
Quiescent Current  
T = 25°C  
mA  
mA  
d
J
I  
Quiescent Current Change  
I
I
I
= 5 to 350 mA  
= 200 mA  
= 5 mA  
0.5  
0.8  
d
O
O
O
V = 27 to 38 V  
I
V /T Output Voltage Drift  
-1.2  
mV/°C  
dB  
O
SVR Supply Voltage Rejection  
V = 28 to 38 V  
f = 120Hz  
50  
I
I
= 300mA  
T = 25°C  
J
O
eN  
Output Noise Voltage  
Dropout Voltage  
B =10Hz to 100KHz  
T = 25°C  
T = 25°C  
170  
2
µV  
V
J
V
d
J
I
Short Circuit Current  
T = 25°C  
V = 35 V  
240  
700  
mA  
mA  
sc  
J
I
I
Short Circuit Peak Current T = 25°C  
J
scp  
9/17  
L78M00AB/AC SERIES  
Figure 4 : Dropout Voltage vs Junction  
Figure 7 : Output Voltage vs Junction  
Temperature  
Temperature  
Figure 5 : Dropout Characteristics  
Figure 8 : Supply Voltage Rejection vs  
Frequency  
Figure 6 : Peak Output Current vs Input-Output  
Figure 9 : Quiescent Current vs Junction  
Differential Voltage  
Temperature  
10/17  
L78M00AB/AC SERIES  
Figure 10 : Load Transient Response  
Figure 12 : Quiescent Current vs Input Voltage  
Figure 11 : Line Transient Response  
11/17  
L78M00AB/AC SERIES  
APPLICATIONS INFORMATION  
DESIGN CONSIDERATIONS  
The L78M00AB Series of fixed voltage regulators are designed with Thermal Overload Protection that  
shuts down the circuit when subjected to an excessive power overload condition, Internal Short-Circuit  
Protection that limits the maximum current the circuit will pass, and Output Transistor Safe-Area  
Compensation that reduces the output short-circuit as the voltage across the pass transistor is increased.  
In many low current applications, compensation capacitors are not required. However, it is recommended  
that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter  
with long wire lengths, or if the output load capacitance is large. An input bypass capacitor should be  
selected to provide good high-frequency characteristics to insure stable operation under all load  
conditions. A 0.33µF or larger tantalum, mylar, or other capacitor having low internal impedance at high  
frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads  
directly across the regulators input terminals. Normally good construction techniques should be used to  
minimize ground loops and lead resistance drops since the regulator has no external sense lead.  
Figure 13 : Current Regulator  
V
R
xx  
I
=
+ I  
d
O
1
Figure 14 : Adjustable Output Regulator  
V
, 7.0V to 20V  
O
V - V 2.0V  
I
O
The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The min-  
imum voltage obtainable with this arrangement is 2.0V greater than the regulator voltage.  
12/17  
L78M00AB/AC SERIES  
Figure 15 : Current Boost Regulator  
V
BEQ1  
R
=
1
I
Q1  
I
-
REQ  
β
Q1  
V
BEQ1  
I
= I  
+ Q (I  
REG  
)
O
REG  
1
R
1
Figure 16 : Short-Circuit Protection  
The circuit of figure 6 can be modified to provide supply protection against short circuits by adding a short-circuit sense resistor, RSC, and  
an additional PNP transistor. The current sensing PNP must be able to handle the short-circuit current of the three-terminal regulator. There-  
fore, a four-ampere plastic power transistor is specified.  
13/17  
L78M00AB/AC 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  
15.25  
6.2  
14.0  
2.95  
15.75  
6.6  
0.511  
0.104  
0.600  
0.244  
0.137  
0.147  
0.551  
0.116  
0.620  
0.260  
0.154  
0.151  
3.5  
3.93  
3.85  
3.75  
P011C  
14/17  
L78M00AB/AC SERIES  
CAL DATA  
DPAK MECHANI  
mm.  
inch  
DIM.  
MIN.  
2.2  
TYP  
MAX.  
MIN.  
0.086  
0.035  
0.001  
0.025  
0.204  
0.017  
0.019  
0.236  
0.252  
0.173  
0.368  
TYP.  
MAX.  
0.094  
0.043  
0.009  
0.035  
0.212  
0.023  
0.023  
0.244  
0.260  
0.181  
0.397  
A
A1  
A2  
B
2.4  
1.1  
0.23  
0.9  
5.4  
0.6  
0.6  
6.2  
6.6  
4.6  
10.1  
0.9  
0.03  
0.64  
5.2  
B2  
C
0.45  
0.48  
6
C2  
D
E
6.4  
G
4.4  
H
9.35  
L2  
L4  
0.8  
0.031  
0.6  
1
0.023  
0.039  
0068772-B  
15/17  
L78M00AB/AC SERIES  
Tape & Reel DPAK-PPAK MECHANICAL DATA  
mm.  
TYP  
inch  
TYP.  
DIM.  
MIN.  
MAX.  
330  
MIN.  
MAX.  
12.992  
0.519  
A
C
D
12.8  
20.2  
60  
13.0  
13.2  
0.504  
0.795  
2.362  
0.512  
N
T
14.4  
7.00  
10.60  
2.75  
4.1  
0.567  
0.2.76  
0.417  
0.105  
0.161  
0.319  
Ao  
Bo  
Ko  
Po  
P
6.80  
10.40  
2.55  
3.9  
6.90  
10.50  
2.65  
4.0  
0.268  
0.409  
0.100  
0.153  
0.311  
0.272  
0.413  
0.104  
0.157  
0.315  
7.9  
8.0  
8.1  
16/17  
L78M00AB/AC SERIES  
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the  
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from  
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications  
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information  
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or  
systems without express written approval of STMicroelectronics.  
The ST logo is a registered trademark of STMicroelectronics  
All other names are the property of their respective owners  
© 2003 STMicroelectronics - All Rights Reserved  
STMicroelectronics GROUP OF COMPANIES  
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Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.  
http://www.st.com  
17/17  

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