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L7912CT Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer L7912CT
Beschreibung NEGATIVE VOLTAGE REGULATORS
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 13 Seiten
L7912CT Datasheet, Funktion
L7900
® SERIES
NEGATIVE VOLTAGE REGULATORS
s OUTPUT CURRENT UP TO 1.5 A
s OUTPUT VOLTAGES OF -5; -5.2; -6; -8; -9;
-12; -15; -18; -20; -22; -24V
s THERMAL OVERLOAD PROTECTION
s SHORT CIRCUIT PROTECTION
s OUTPUT TRANSITION SOA PROTECTION
DESCRIPTION
The L7900 series of three-terminal negative
regulators is available in TO-220, ISOWATT220
TO-3 and D2PAK packages 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;
furthermore, having the same voltage option as
the L7800 positive standard series, they are
particularly suited for split power supplies. In
addition, the -5.2V is also available for ECL
system. If adequate heat sinking is provided,
they can deliver over 1.5A output current.
Although designed primarily as fixed voltage
regulators, these devices can be used with
external components to obtain adjustable
voltages and currents.
SCHEMATIC DIAGRAM
1
2
TO-3
3
1
D2PAK
TO-220
3
2
1
ISOWATT220
November 1999
1/13






L7912CT Datasheet, Funktion
L7900
ELECTRICAL CHARACTERISTICS FOR L7918C (refer to the test circuits, Tj = 0 to 150 oC,
Vi = -27V, Io = 500 mA, Ci = 2.2 µF, Co = 1 µF unless otherwise specified)
Symbol
Parameter
Test Conditions
Min. Typ. Max.
Vo Output Voltage
Tj = 25 oC
-17.3 -18 -18.7
Vo Output Voltage
Vo* Line Regulation
Vo* Load Regulation
Id Quiescent Current
Io = -5 mA to -1 A Po 15 W
Vi = -22 to -33 V
Vi = -21 to -33 V Tj = 25 oC
Vi = -24 to -30 V Tj = 25 oC
Io = 5 to 1500 mA Tj = 25 oC
Io = 250 to 750 mA Tj = 25 oC
Tj = 25 oC
-17.1 -18 -18.9
3 60
1 80
3 60
1 80
3
Id Quiescent Current Change Io = 5 to 1000 mA
0.5
Id Quiescent Current Change Vi = -22 to -33 V
1
Vo Output Voltage Drift
T
Io = 5 mA
-1
eN Output Noise Voltage
B = 10Hz to 100KHz Tj = 25 oC
300
SVR Supply Voltage Rejection
Vd Dropout Voltage
Vi = 10 V f = 120 Hz
Io = 1 A
Tj = 25 oC
VO = 100 mV
54 60
1.1
Is c Short Circuit Current
Iscp Short Circuit Peak Current
Tj = 25 oC
1.1
2.2
Unit
V
V
mV
mV
mV
mV
mA
mA
mA
m V/ oC
µV
dB
V
A
A
ELECTRICAL CHARACTERISTICS FOR L7920C (refer to the test circuits, Tj = 0 to 150 oC,
Vi = -29V, Io = 500 mA, Ci = 2.2 µF, Co = 1 µF unless otherwise specified)
Symbol
Parameter
Test Conditions
Min. Typ. Max.
Vo Output Voltage
Tj = 25 oC
-19.2 -20 -20.8
Vo Output Voltage
Vo* Line Regulation
Vo* Load Regulation
Id Quiescent Current
Io = -5 mA to -1 A Po 15 W
Vi = -24 to -35 V
Vi = -23 to -35 V Tj = 25 oC
Vi = -26 to -32 V Tj = 25 oC
Io = 5 to 1500 mA Tj = 25 oC
Io = 250 to 750 mA Tj = 25 oC
Tj = 25 oC
-19 -20 -21
4 00
2 00
4 00
2 00
3
Id Quiescent Current Change Io = 5 to 1000 mA
0.5
Id Quiescent Current Change Vi = -24 to -35 V
1
Vo Output Voltage Drift
T
Io = 5 mA
-1.1
eN Output Noise Voltage
B = 10Hz to 100KHz Tj = 25 oC
350
SVR Supply Voltage Rejection
Vd Dropout Voltage
Vi = 10 V f = 120 Hz
Io = 1 A
Tj = 25 oC
VO = 100 mV
54 60
1.1
Is c Short Circuit Current
Iscp Short Circuit Peak Current
Tj = 25 oC
0.9
2.5
Unit
V
V
mV
mV
mV
mV
mA
mA
mA
m V/ oC
µV
dB
V
A
A
* Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account
separately. Pulce testing with low duty cycle is used.
6/13

6 Page









L7912CT pdf, datenblatt
L7900
DIM.
A
A1
B
B2
C
C2
D
E
G
L
L2
L3
TO-263 (D2PAK) MECHANICAL DATA
MIN.
4.4
2.49
0.7
1.14
0.45
1.23
8.95
10
4.88
15
1.27
1.4
mm
TYP.
MAX.
4.6
2.69
0.93
1.7
0.6
1.36
9.35
10.4
5.28
15.85
1.4
1.75
MIN.
0.173
0.098
0.027
0.044
0.017
0.048
0.352
0.393
0.192
0.590
0.050
0.055
inch
TYP.
MAX.
0.181
0.106
0.036
0.067
0.023
0.053
0.368
0.409
0.208
0.624
0.055
0.068
A
C2
E
D
DETAIL ”A”
C
A1
B2
DETAIL ”A”
B
G
12/13
L2 L L3
P011P6/F

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