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MC78T08C 데이터시트 PDF




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부품번호 MC78T08C 기능
기능 THREE-AMPERE POSITIVE FIXED VOLTAGE REGULATORS
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MC78T08C 데이터시트, 핀배열, 회로
MC78T00 Series
3.0 A Positive Voltage
Regulators
This family of fixed voltage regulators are monolithic integrated
circuits capable of driving loads in excess of 3.0 A. These
three−terminal regulators employ internal current limiting, thermal
shutdown, and safe−area compensation. Devices are available with
improved specifications, including a 2% output voltage tolerance, on
AC−suffix 5.0 V, 12 V and 15 V device types.
Although designed primarily as a fixed voltage regulator, these
devices can be used with external components to obtain adjustable
voltages and currents. This series of devices can be used with a
series−pass transistor to supply up to 15 A at the nominal output
voltage.
Output Current in Excess of 3.0 A
Power Dissipation: 25 W
No External Components Required
Output Voltage Offered in 2% and 4% Tolerance*
Thermal Regulation is Specified
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe−Area Compensation
Pb−Free Packages are Available
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Input
Cin*
0.33 mF
MC78TXX
Output
CO**
Figure 1. Simplified Application
A common ground is required between the input and the output voltages. The input voltage
must remain typically 2.2 V above the output voltage even during the low point on the input
ripple voltage.
XX these two digits of the type number indicate voltage.
** Cin is required if regulator is located an appreciable distance from power supply filter.
** (See Applications Information for details.)
** CO is not needed for stability; however, it does improve transient response.
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3A
POSITIVE FIXED
VOLTAGE REGULATORS
MARKING
DIAGRAMS
TO−220
T SUFFIX
CASE 221A
MC
78TxxyzT
AWLYWW
1
2
3
Pin 1. Input
2. Ground*
3. Output
*Heatsink surface is connected to Pin 2.
D2PAK−3
CASE 936
MC
78TxxyzD2T
AWLYWW
MC = Specific Device Code
xx = Voltage Option
y = “A” letter for precise 2% regulators, not
used for standard 4% regulators.
z = temperature range, “B” for wide
temperature range, −40°C to +125°C, “C”
for standard temperature range,
0°C to +125°C.
A = Assembly Location
WL= Wafer Lot
Y = Year
W = Work Week
© Semiconductor Components Industries, LLC, 2004
March, 2004 − Rev. 4
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
1 Publication Order Number:
MC78T00/D




MC78T08C pdf, 반도체, 판매, 대치품
MC78T00 Series
ELECTRICAL CHARACTERISTICS (Vin = 17 V, IO = 3.0 A, 0°C TJ 125°C, PO Pmax (Note 6), unless otherwise noted.)
MC78T12AC
MC78T12C
Characteristics
Symbol Min Typ Max Min Typ Max Unit
Output Voltage
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A,
5.0 mA IO 2.0 A, 14.5 Vdc Vin 27 Vdc)
VO
11.75 12 12.25 11.5
11.5 12 12.5 11.4
Line Regulation (Note 7)
(14.5 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
14.5 Vdc Vin 35 Vdc, IO = 1.0 A, TJ = +25°C;
16 Vdc Vin 22 Vdc, IO = 3.0 A, TJ = +25°C;
14.9 Vdc Vin 27 Vdc, IO = 1.0 A)
Regline
6.0 45
Vdc
12 12.5
12 12.6
6.0 45 mV
Load Regulation (Note 7)
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
Thermal Regulation
(Pulse = 10 ms, P = 20 W, TA = +25°C)
Regload
10 30
15 80
Regtherm − 0.001 0.01
mV
− 10 30
− 15 80
− 0.002 0.03 %VO/W
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
IB mA
− 3.5 5.0 − 3.5 5.0
− 4.0 6.0 − 4.0 6.0
Quiescent Current Change
(14.5 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA IO 3.0 A, TJ = +25°C;
14.9 Vdc Vin 27 Vdc, IO = 1.0 A)
DIB
− 0.3 1.0 − 0.3 1.0 mA
Ripple Rejection
(15 Vdc Vin 25 Vdc, f = 120 Hz,
IO = 2.0 A, TJ = 25°C)
RR 57 67 − 57 67 − dB
Dropout Voltage (IO = 3.0 A, TJ = +25°C)
Vin − VO
2.2 2.5
2.2 2.5 Vdc
Output Noise Voltage
(10 Hz f 100 kHz, TJ = +25°C)
Vn
− 10 −
− 10 − mV/VO
Output Resistance (f = 1.0 kHz)
RO
− 2.0 −
− 20 − mW
Short Circuit Current Limit
(Vin = 35 Vdc, TJ = +25°C)
ISC
− 1.5 −
− 1.5 −
A
Peak Output Current (TJ = +25°C)
Imax − 5.0 − − 5.0 − A
Average Temperature Coefficient
of Output Voltage (IO = 5.0 mA)
TCVO − 0.5 −
− 0.5 − mV/°C
6. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25 W.
7. Line and load 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 cycle is used.
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MC78T08C 전자부품, 판매, 대치품
MC78T00 Series
1.02 100
Vin − Vout = 10 V
10−1
Iout = 100 mA
Vout = 5.0 V
Vin = 7.5 V
1.0 10−2 Iout = 1.0 A
CO = 0
TJ = 25°C
10−3
.98
−90
−50 −10 30 70 110 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 4. Temperature Stability
190
10−4
1.0
10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M
f, FREQUENCY (Hz)
Figure 5. Output Impedance
100
80 Iout = 50 mA
Iout = 1.5 A
60 Vout = 5.0 V
Vin = 10 V
CO = 0
40 TJ = 25°C
20
1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M
f, FREQUENCY (Hz)
Figure 6. Ripple Rejection versus Frequency
100
80
60
40
30
0.01
Vout = 5.0 V
Vin = 10 V
CO = 0
f = 120 Hz
TJ = 25°C
0.1 1.0
Iout, OUTPUT CURRENT (A)
Figure 7. Ripple Rejection versus
Output Current
10
4.0 TJ = 0°C
TJ = 25°C
3.0 TJ = 125°C
2.0
1.0 TJ = 0°C
TJ = 25°C
0 TJ = 125°C
0 10 20
30
Vin, INPUT VOLTAGE (Vdc)
40
Figure 8. Quiescent Current versus
Input Voltage
5.0
4.0 TJ = 0°C
TJ = 25°C
3.0 TJ = 125°C
2.0
1.0
0
0.01
Vin−Vout = 5.0 V
0.1 1.0
Iout, OUTPUT CURRENT (A)
Figure 9. Quiescent Current versus
Output Current
10
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