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MC7812A Schematic ( PDF Datasheet ) - Fairchild

Teilenummer MC7812A
Beschreibung 3-Terminal 1A Positive Voltage Regulator
Hersteller Fairchild
Logo Fairchild Logo 




Gesamt 28 Seiten
MC7812A Datasheet, Funktion
www.fairchildsemi.com
MC78XX/LM78XX/MC78XXA
3-Terminal 1A Positive Voltage Regulator
Features
• Output Current up to 1A
• Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24V
• Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Protection
Description
The MC78XX/LM78XX/MC78XXA series of three
terminal positive regulators are available in the
TO-220/D-PAK 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. 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 components to
obtain adjustable voltages and currents.
TO-220
1
D-PAK
1
1. Input 2. GND 3. Output
Internal Block Digram
©2001 Fairchild Semiconductor Corporation
Rev. 1.0.1






MC7812A Datasheet, Funktion
MC78XX/LM78XX/MC78XXA
Electrical Characteristics (MC7810)
(Refer to test circuit ,0°C< TJ < 125°C, IO = 500mA, VI =16V, CI= 0.33µF, CO=0.1µF, unless otherwise specified)
Parameter
Output Voltage
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Output Resistance
Short Circuit Current
Peak Current
Symbol
VO
Regline
Regload
IQ
IQ
VO/T
VN
RR
VDrop
rO
ISC
IPK
Conditions
TJ =+25 °C
5.0mA IO1.0A, PO 15W
VI = 12.5V to 25V
TJ =+25°C
VI = 12.5V to 25V
VI = 13V to 25V
TJ =+25°C
IO = 5mA to 1.5A
IO = 250mA to 750mA
TJ =+25°C
IO = 5mA to 1.0A
VI = 12.5V to 29V
IO = 5mA
f = 10Hz to 100KHz, TA =+25 °C
f = 120Hz
VI = 13V to 23V
IO = 1A, TJ=+25 °C
f = 1KHz
VI = 35V, TA=+25 °C
TJ =+25 °C
MC7810
Min. Typ. Max.
9.6 10 10.4
Unit
9.5 10 10.5 V
- 10 200
mV
- 3 100
- 12 200
mV
- 4 400
- 5.1 8.0 mA
- - 0.5
mA
- - 1.0
- -1 - mV/°C
- 58 - µV/Vo
56 71 - dB
- 2- V
- 17 - m
- 250 - mA
- 2.2 -
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

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MC7812A pdf, datenblatt
MC78XX/LM78XX/MC78XXA
Electrical Characteristics (MC7806A)
(Refer to the test circuits. 0°C < TJ < 125°C, Io =1A, V I =11V, C I=0.33µF, C O=0.1µF, unless otherwise specified)
Parameter
Output Voltage
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Output Resistance
Short Circuit Current
Peak Current
Symbol
VO
Regline
Regload
IQ
IQ
V/T
VN
RR
VDrop
rO
ISC
IPK
Conditions
TJ =+25 oC
IO = 5mA to 1A, PO 15W
VI = 8.6V to 21V
VI= 8.6V to 25V
IO = 500mA
VI= 9V to 13V
TJ =+25 oC
VI= 8.3V to 21V
VI= 9V to 13V
TJ =+25 oC
IO = 5mA to 1.5A
IO = 5mA to 1A
IO = 250mA to 750mA
TJ =+25 oC
IO = 5mA to 1A
VI = 9V to 25V, IO = 500mA
VI= 8.5V to 21V, TJ =+25 oC
IO = 5mA
f = 10Hz to 100KHz
TA =+25 oC
f = 120Hz, IO = 500mA
VI = 9V to 19V
IO = 1A, TJ =+25 oC
f = 1KHz
VI= 35V, TA =+25 oC
TJ=+25 oC
Min. Typ. Max.
5.58 6 6.12
5.76 6 6.24
Unit
V
- 5 60
- 3 60
- 5 60
- 1.5 30
mV
- 9 100
- 4 100 mV
- 5.0 50
- 4.3 6
mA
- - 0.5
- - 0.8 mA
- - 0.8
- -0.8 - mV/ oC
- 10 - µV/Vo
- 65 -
-2 -
- 17 -
- 250 -
- 2.2 -
dB
V
m
mA
A
Note:
1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
12

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