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MC7912CT Schematic ( PDF Datasheet ) - Fairchild

Teilenummer MC7912CT
Beschreibung 3-Terminal 1A Negative Voltage Regulator
Hersteller Fairchild
Logo Fairchild Logo 




Gesamt 18 Seiten
MC7912CT Datasheet, Funktion
www.fairchildsemi.com
MC79XX/MC79XXA/LM79XX
3-Terminal 1A Negative Voltage Regulator
Features
• Output Current in Excess of 1A
• Output Voltages of -5, -6, -8 , -9, -10, -12, -15, -18 and -
24V
• Internal Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Compensation
Description
The MC79XX / MC79XXA/ LM79XX 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 operating area protection, making it essentially
indestructible.
TO-220
Vin
1
1. GND 2. Input 3. Output
Internal Block Digram
GND
VOLTAGE
REFERENCE
I1
+
-
I2
R1
R2
OOuutptut
Q1
PROTECTION
CIRCUITRY
Q2
Rsc
In
Input
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.1






MC7912CT Datasheet, Funktion
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7910) (Continued)
(VI = -17V, IO = 500mA, 0°C TJ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.)
Parameter
Output Voltage
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VO
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
Conditions
Min.
TJ = +25°C
-9.6
IO = 5mA to 1A, Pd 15W
VI = -12V to -28
-9.5
TJ = +25°C
VI = -12.5V to -28V -
VI = -14V to -20V
-
TJ = +25°C
IO = 5mA to 1.5A
-
TJ = +25°C
IO = 250mA to 750mA
-
TJ = +25°C
-
IO = 5mA to 1A
-
VI = -12.5V to -28V
-
IO = 5mA
-
10Hz f 100kHz
TA =+25°C
-
f = 120Hz
VI = 10V
54
TJ = +25°C
IO = 1A
-
TJ = +25°C, VI = -35V
-
TJ = +25°C
-
Typ.
-10
-10
12
6
12
4
3
0.05
0.1
-1
280
60
2
300
2.2
Max.
-10.4
-10.5
Unit
V
200
mV
100
200
mV
100
6 mA
0.5
mA
1
- mV/°C
- µV
- dB
-V
- mA
-A
Note:
1. 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

6 Page









MC7912CT pdf, datenblatt
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7912A) (Continued)
(VI = -19V, IO = 500mA, 0°C TJ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.)
Parameter
Output Voltage
Line Regulation (Note1)
Load Regulation (Note1)
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
Conditions
Min.
TJ = +25°C
-11.75
IO = 5mA to 1A, PO 15W
VI = -15.5V to -27V
-11.5
TJ = +25°C
VI = -14.5V to -27V
Io = 1A
VI = -16V to -22V
Io = 1A
-
-
VI = -14.8V to -30V
-
VI = -16V to -22V, Io = 1A
-
TJ = +25°C
IO = 5mA to 1.5A
-
TJ = +25°C
IO = 250mA to 750mA
-
TJ = +25°C
-
IO = 5mA to 1A
-
VI = -15V to -30V
-
IO = 5mA
-
f = 10Hz to 100kHz
TA = +25°C
-
f = 120Hz
VI = 10V
54
TJ = +25°C
IO = 1A
-
TJ = +25°C, VI = -35V
-
TJ = +25°C
-
Typ.
-12
-12
12
6
12
12
12
4
3
0.05
0.1
-0.8
200
60
2
300
2.2
Max.
-12.25
-12.5
Unit
V
120
60 mV
120
120
150
mV
75
6 mA
0.5
mA
1
- mV/°C
- µV
- dB
-V
- mA
-A
Note:
1. 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

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