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MC7818CT Schematic ( PDF Datasheet ) - Vishay

Teilenummer MC7818CT
Beschreibung (MC78xxCT) 3-Terminal Fixed Positive Voltage Regulators
Hersteller Vishay
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Gesamt 9 Seiten
MC7818CT Datasheet, Funktion
( DataSheet : www.DataSheet4U.com )
New Product
MC78xxCT Series
Vishay Semiconductor
3-Terminal Fixed Positive Voltage Regulators
MC78xxCT
TO-220AB
3
2
1
Pin Definition
1. Input
2. Ground
3. Output
(Heatsink/ tab
connected to pin 2)
Input
Cin
0.33µF
Standard Application
MC78xx
Output
Co
0.1µF
Notes:
A common ground is required between the input and the output voltages.
The input voltage must remain typically 2.0V above the output voltage
even during the low point on the input ripple voltage.
xx = these two digits of the part number indicate output voltage.
Cin is required if regulator is located an appreciable distance from power
supply filter.
Co is not needed for stability, however, it does improve transient response.
Description
These voltage regulators are monolithic integrated circuits
designed as fixed-voltage regulators for a wide variety of
applications including local, on-card regulation. These
regulators employ internal current limiting, thermal shut-
down, and safe-area compensation. With adequate
heatsinking the MC78xxCT can deliver output currents in
excess of 1.5 ampere.
Although designed primarily as a fixed voltage regulator,
these devices can be used with external components to
obtain adjustable voltages with currents.
Features
• Output current in excess of 1.0 ampere
• No external components required
• Internal thermal overload protection
• Internal short-circuit current limiting
• Output transistor safe-area compensation
• Output voltage offered in 2% tolerance
Mechanical Data
Case: TO-220 Package
Case outline is on the back page.
Internal Block Diagram
Input
1
Starting
Circuit
Current
Generator
Series
Pass
Element
SOA
Protection
Reference
Voltage
Error
Amplifier
Thermal
Protection
Output
3
GND
2
Document Number 74813
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1






MC7818CT Datasheet, Funktion
MC78xxCT Series
Vishay Semiconductor
Electrical Characteristics – MC7818
Vin = 27V, Iout = 500mA, 0°C TJ 125°C, Cin = 0.33µF, Cout = 0.1µF; unless otherwise noted.
Parameter
Symbol
Conditions
Min. Typ. Max. Unit
Output Voltage
TJ = 25°C
17.64 18.0 18.36
Vout
21V Vin 33V,
5mA Iout 1.0A, PD 15W
17.44
18.56
V
Line Regulation
(TJ = 25°C)
REGline
21V Vin < 33V
22V Vin < 26V
15 360
mV
5 180
Load Regulation
(TJ = 25°C)
REGload
10mA Iout < 1.5A
250mA Iout < 750mA
12 360
mV
4 180
Quiescent Current
Iq
Iout = 0, TJ = 25°C
4.5 8 mA
Quiescent Current Change
21V Vin 33V
——
1
Iq mA
5mA Iout 1.0A
— — 0.5
Output Noise Voltage
Vn 10Hz f 100KHz,TJ= 25°C 110 mV
Ripple Rejection Ratio
RR f = 120Hz,21V Vin 31V 53 69 dB
Dropout Voltage
Vdrop
Iout = 1.0A, TJ = 25°C
2
V
Output Resistance
Rout
f = 1KHz
22 m
Output Short Circuit Current
Ios
TJ = 25°C
200 mA
Peak Output Current
Io peak
TJ = 25°C
1.5
A
Temperature Coefficient of Output Voltage
Vout/TJ Iout = 5mA,0°C TJ 125°C — –1 mV/°C
Electrical Characteristics – MC7824
Vin = 33V, Iout = 500mA, 0°C TJ 125°C, Cin = 0.33µF, Cout = 0.1µF; unless otherwise noted.
Parameter
Symbol
Conditions
Min.
Output Voltage
TJ = 25°C
23.52
Vout
26V Vin 38V,
5mA Iout 1.0A, PD 15W
23.32
Line Regulation
(TJ = 25°C)
REGline
26V Vin < 38V
27V Vin < 32V
Load Regulation
(TJ = 25°C)
REGload
10mA Iout < 1.5A
250mA Iout < 750mA
Quiescent Current
Iq
Iout = 0, TJ = 25°C
Quiescent Current Change
26V Vin 38V
Iq
5mA Iout 1.0A
Output Noise Voltage
Vn 10Hz f 100KHz,TJ= 25°C
Ripple Rejection Ratio
Rrej f = 120Hz, 26V Vin 36V 50
Dropout Voltage
Vdrop
Iout = 1.0A, TJ = 25°C
Output Resistance
Rout
f = 1KHz
Output Short Circuit Current
Ios
TJ = 25°C
Peak Output Current
Io peak
TJ = 25°C
Temperature Coefficient of Output Voltage
Vout/TJ Iout = 5mA,0°C TJ 125°C
Typ.
24.0
18
6
12
4
4.6
170
66
2
28
150
1.5
1.5
Max.
24.48
24.68
Unit
V
480
mV
240
480
mV
240
8 mA
1
mA
0.5
µV
dB
V
m
mA
A
mV/°C
www.vishay.com
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Document Number 74813
29-Nov-01

6 Page







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