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MC78915CT Schematic ( PDF Datasheet ) - Fairchild

Teilenummer MC78915CT
Beschreibung 3-TERMINAL 1A NEGATIVE VOLTAGE REGULATORS
Hersteller Fairchild
Logo Fairchild Logo 




Gesamt 15 Seiten
MC78915CT Datasheet, Funktion
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
3-TERMINAL 1A NEGATIVE VOLTAGE REGULATORS
The MC79XX series of three-terminal negative regulators are available in
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 area protection, making it essentially indestructible.
TO-220
FEATURES
Output Current in Excess of 1A
Output Voltages of -5, -6, -8, -12, -15, -18, -24V
Internal Thermal Overload Protection
Short Circuit Protection
Output Transistor Safe-Area Compensation
1: GND 2: Input 3: Output
ORDERING INFORMATION
Device
MC79XXCT (LM79XXCT) (KA79XX)
KA79XXA
Output Voltage
Tolerance
± 4%
± 2%
Package
TO-220
Operating Temperature
0 ~+125°C
BLOCK DIAGRAM
GND
VOLTAGE
REFERENCE
I1
+
-
I2
R1
R2
Out
Q1
PROTECTION
CIRCUITRY
Q2
Rsc
In
©1999 Fairchild Semiconductor Corporation
Rev. C






MC78915CT Datasheet, Funktion
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7912 ELECTRICAL CHARACTERISTICS
(VI= 18V, lO =500mA, 0°C TJ≤ +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VD
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
Symbol
VO
VO
VO
IQ
IQ
VO/T
VN
RR
VD
ISC
IPK
Test Conditions
TJ = +25°C
IO = 5mA to 1A, PO 15W
VI = -15.5 to -27V
TJ = 25°C VI = -14.5 to -30V
VI= -16 to -22V
TJ =+ 25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -15 to -30V
IO = 5mA
f = 10Hz to 100KHz
TA =+ 25°C
f = 120Hz
VI = 10V
TJ= +25°C
IO = 1A
TJ=+ 25°C, VI = -35V
TJ=+ 25°C
Min Typ Max
Unit
-11.5 -12 -12.5
-11.4 -12 -12.6
12 240
6 120
V
mV
12 240
4 120
mV
3 6 mA
0.05
0.1
0.5
1
mA
-0.8 mV/°C
200 µV
54 60
dB
2V
300 mA
2.2 A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.

6 Page









MC78915CT pdf, datenblatt
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7915A ELECTRICAL CHARACTERISTICS
(VI = 23V, lO = 500mA, 0°C TJ≤ +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VD
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
Symbol
Test Conditions
VO
VO
VO
IQ
IQ
VO/T
VN
RR
VD
ISC
IPK
TJ = +25°C
IO = 5mA to 1A, PO 15W
VI = -18 to -30V
TJ =+25°C VI = -17.5 to -30V
VI= -20 to -26V
TJ =+ 25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -18.5 to -30V
IO = 5mA
f = 10Hz to 100KHz
TA =+25°C
f = 120Hz
VI = 10V
TJ= +25°C
IO = 1A
TJ=+ 25°C, VI = -35V
TJ=+ 25°C
Min Typ Max
-14.7 -15 -15.3
-14.4 -15 -15.6
12 300
6 150
12 300
4
3
0.05
0.1
-0.9
250
150
6
0.5
1
54 60
2
300
2.2
Unit
V
mV
mV
mA
mA
mV/°C
µV
dB
V
mA
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.

12 Page





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