Motorola MC78T05ABT, MC78T15ACT, MC78T15BT, MC78T15CT, MC78T15ABT Datasheet

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Order this document by MC78T00/D


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, 12 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 Of fered in 2% and 4% Tolerance*
Thermal Regulation is Specified
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe–Area Compensation
MAXIMUM RATINGS
Input Voltage (5.0 V – 12 V)
Input Voltage (15 V)
Power Dissipation and Thermal Characteristics
Plastic Package (Note 1)
TA = +25°C Thermal Resistance, Junction–to–Air TC = +25°C
Thermal Resistance, Junction–to–Case Storage Junction Temperature T Operating Junction Temperature Range
(MC78T00C, AC)
NOTES: 1.Although power dissipation is internally limited, specifications apply only
for PO P
(TA = +25°C, unless otherwise noted.)
Rating
, P
max
max
= 25 W.
Symbol Value Unit
R
R
V
I
P
Internally Limited
D
θJA
P
Internally Limited
D
θJC stg
T
J
35 40
65
2.5
+150 °C
0 to +125 °C
Vdc
°C/W
°C/W
THREE–AMPERE
POSITIVE FIXED
VOLTAGE REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Pin 1. Input
2. Ground
3. Output
Heatsink surface is connected to Pin 2.
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC78T05 MC78T08
8.0 V
1
2
MC78T12 MC78T15
3
12 V 15 V
Simplified Application
Input
Cin*
µ
FC
0.33
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.
MC78TXX
Output
**
O
Device
MC78TXXCT MC78TXXACT
MC78TXXBT# MC78TXXABT#
XX Indicates nominal voltage.
* 2% regulators available in 5, 12 and 15 V devices.
# Automotive temperature range selections are avail-
able with special test conditions and additional tests. Contact your local Motorola sales office for information.
Motorola, Inc. 1996 Rev 1
MOTOROLA ANALOG IC DEVICE DATA
ORDERING INFORMATION
O
Operating
Temperature
Range
TJ = 0° to
+125°C
TJ = –40° to
+125°C
V
Tol.
4%
2%*
4%
2%*
Package
Plastic Power
Plastic Power
1
MC78T00 Series
ELECTRICAL CHARACTERISTICS
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, 7.3 Vdc Vin 20 Vdc)
Line Regulation (Note 2)
(7.2 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
7.2 Vdc Vin 35 Vdc, IO = 1.0 A, TJ = +25°C;
8.0 Vdc Vin 12 Vdc, IO = 3.0 A, TJ = +25°C;
7.5 Vdc Vin 20 Vdc, IO = 1.0 A)
Load Regulation (Note 2)
(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)
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C) (5.0 mA IO 3.0 A)
Quiescent Current Change
(7.2 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA IO 3.0 A, TJ = +25°C;
7.5 Vdc Vin 20 Vdc, IO = 1.0 A)
Ripple Rejection
(8.0 Vdc Vin 18 Vdc, f = 120 Hz,
IO = 2.0 A, TJ = 25°C) Dropout Voltage (IO = 3.0 A, TJ = +25°C) Vin–V Output Noise Voltage
(10 Hz f 100 kHz, TJ = +25°C) Output Resistance (f = 1.0 kHz) R Short Circuit Current Limit
(Vin = 35 Vdc, TJ = +25°C) Peak Output Current (TJ = +25°C) I Average Temperature Coefficient of Output Voltage
(IO = 5.0 mA)
NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO P
2.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.
(Vin = 10 V, IO = 3.0 A, 0°C TJ 125°C, PO P
MC78T05AC MC78T05C
V
O
Reg
line
Reg
load
Reg
therm
I
B
I
B
RR 62 75 62 75 dB
V
n
O
I
SC
max
TCV
4.9
4.8
3.0 25 3.0 25 mV
– –
0.001 0.01 0.002 0.03 %VO/W
– –
0.3 1.0 0.3 1.0 mA
2.2 2.5 2.2 2.5 Vdc
O
10 10 µV/V
2.0 20 m 1.5 1.5 A
5.0 5.0 A
O
0.2 0.2 mV/°C
5.0
5.0
10 15
3.5
4.0
max
, P
[Note 1], unless otherwise noted.)
max
max
5.1
5.2
30 80
5.0
6.0
= 25 W.
4.8
4.75
– –
– –
5.0
5.0
10 15
3.5
4.0
5.25
5.2
Vdc
mV 30 80
mA
5.0
6.0
O
2
MOTOROLA ANALOG IC DEVICE DATA
MC78T00 Series
ELECTRICAL CHARACTERISTICS (V
Characteristics Symbol 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, 10.4 Vdc Vin 23 Vdc)
Line Regulation (Note 2)
(10.3 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C
10.3 Vdc Vin 35 Vdc, IO = 1.0 A, TJ = +25°C 11 Vdc Vin 17 Vdc, IO = 3.0 A, TJ = +25°C
10.7 Vdc Vin 23 Vdc, IO = 1.0 A)
Load Regulation (Note 2)
(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)
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C) (5.0 mA IO 3.0 A)
Quiescent Current Change
(10.3 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA IO 3.0 A, TJ = +25°C;
10.7 Vdc Vin 23 Vdc, IO = 1.0 A)
Ripple Rejection
(11 Vdc Vin 21 Vdc, f = 120 Hz, IO = 2.0 A, TJ = 25°C) Dropout Voltage (IO = 3.0 A, TJ = +25°C) Vin–V Output Noise Voltage
(10 Hz f 100 kHz, TJ = +25°C) Output Resistance (f = 1.0 kHz) R Short Circuit Current Limit
(Vin = 35 Vdc, TJ = +25°C) Peak Output Current (TJ = +25°C) I Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) TCV
NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO P
2.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.
= 13 V, IO = 3.0 A, 0°C TJ 125°C, PO P
in
Reg
Reg
, P
max
[Note 1], unless otherwise noted.)
max
MC78T08C
V
O
Reg
line
load
therm
I
B
I
B
RR 60 71 dB
V
n
O
I
SC
max
O
max
O
= 25 W.
7.7
7.6
4.0 35 mV
– –
0.002 0.03 %VO/W
– –
0.3 1.0 mA
2.2 2.5 Vdc – 10 µV/V
2.0 m 1.5 A
5.0 A – 0.3 mV/°C
8.0
8.0
10 15
3.5
4.0
8.3
8.4
5.0
6.0
Vdc
mV 30 80
mA
O
MOTOROLA ANALOG IC DEVICE DATA
3
MC78T00 Series
ELECTRICAL CHARACTERISTICS
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)
Line Regulation (Note 2)
(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)
Load Regulation (Note 2)
(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)
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C) (5.0 mA IO 3.0 A)
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)
Ripple Rejection
(15 Vdc Vin 25 Vdc, f = 120 Hz,
IO = 2.0 A, TJ = 25°C) Dropout Voltage (IO = 3.0 A, TJ = +25°C) Vin – V Output Noise Voltage
(10 Hz f 100 kHz, TJ = +25°C) Output Resistance (f = 1.0 kHz) R Short Circuit Current Limit
(Vin = 35 Vdc, TJ = +25°C) Peak Output Current (TJ = +25°C) I Average Temperature Coefficient
of Output Voltage (IO = 5.0 mA)
NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO P
2.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.
(Vin = 17 V, IO = 3.0 A, 0°C TJ 125°C, PO P
MC78T12AC MC78T12C
V
O
Reg
line
Reg
load
Reg
therm
I
B
I
B
RR 57 67 57 67 dB
V
n
O
I
SC
max
TCV
11.75
11.5
6.0 45 6.0 45 mV
– –
0.001 0.01 0.002 0.03 %VO/W
– –
0.3 1.0 0.3 1.0 mA
O
O
2.2 2.5 2.2 2.5 Vdc – 10 10 µV/V
2.0 20 m 1.5 1.5 A
5.0 5.0 A – 0.5 0.5 mV/°C
3.5
4.0
max
12 12
10 15
, P
[Note 1], unless otherwise noted.)
max
max
12.25
12.5
30 80
5.0
6.0
= 25 W.
11.5
11.4
– –
– –
12 12
10 15
3.5
4.0
12.5
Vdc
12.6
mV 30 80
mA
5.0
6.0
O
4
MOTOROLA ANALOG IC DEVICE DATA
MC78T00 Series
ELECTRICAL CHARACTERISTICS (V
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, 17.5 Vdc Vin 30 Vdc)
Line Regulation (Note 2)
(17.6 Vdc Vin 40 Vdc, IO = 5.0 mA, TJ = +25°C;
17.6 Vdc Vin 40 Vdc, IO = 1.0 A, TJ = +25°C; 20 Vdc Vin 26 Vdc, IO = 3.0 A, TJ = +25°C; 18 Vdc Vin 30 Vdc, IO = 1.0 A)
Load Regulation (Note 2)
(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)
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C) (5.0 mA IO 3.0 A)
Quiescent Current Change
(17.6 Vdc Vin 40 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA IO 3.0 A, TJ = +25°C; 18 Vdc Vin 30 Vdc, IO = 1.0 A)
Ripple Rejection
(18.5 Vdc Vin 28.5 Vdc, f = 120 Hz,
IO = 2.0 A, TJ = 25°C) Dropout Voltage (IO = 3.0 A, TJ = +25°C) Vin–V Output Noise Voltage
(10 Hz f 100 kHz, TJ = +25°C) Output Resistance (f = 1.0 kHz) R Short Circuit Current Limit
(Vin = 40 Vdc, TJ = +25°C) Peak Output Current (TJ = +25°C) I Average Temperature Coefficient of Output Voltage
(IO = 5.0 mA)
NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO P
2.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.
= 20 V, IO = 3.0 A, 0°C TJ 125°C, PO P
in
MC78T15AC MC78T15C
V
O
Reg
line
Reg
load
Reg
therm
I
B
I
B
RR 55 65 55 65 dB
V
n
O
I
SC
max
TCV
14.7
14.4
7.5 55 7.5 55 mV
– –
0.001 0.01 0.002 0.03 %VO/W
– –
0.3 1.0 0.3 1.0 mA
O
O
2.2 2.5 2.2 2.5 Vdc – 10 10 µV/V
2.0 20 m 1.0 1.0 A
5.0 5.0 A – 0.6 0.6 mV/°C
15 15
10 15
3.5
4.0
max
, P
[Note 1], unless otherwise noted.)
max
max
15.3
15.6
30 80
5.0
6.0
= 25 W.
14.4
14.25
– –
– –
15 15
10 15
3.5
4.0
15.6
Vdc
15.75
mV 30 80
mA
5.0
6.0
O
MOTOROLA ANALOG IC DEVICE DATA
5
MC78T00 Series
VOLTAGE REGULATOR PERFORMANCE
The performance of a voltage regulator is specified by its immunity to changes in load, input voltage, power dissipation, and temperature. Line and load regulation are tested with a pulse of short duration (< 100µs) and are strictly a function of electrical gain. However, pulse widths of longer duration (>
1.0 ms) are sufficient to affect temperature gradients across the die. These temperature gradients can cause a change in the output voltage, in addition to changes caused by line and load regulation. Longer pulse widths and thermal gradients make it desirable to specify thermal regulation.
Thermal regulation is defined as the change in output voltage caused by a change in dissipated power for a specified time, and is expressed as a percentage output voltage change per watt. The change in dissipated power
can be caused by a change in either the input voltage or the load current. Thermal regulation is a function of IC layout and die attach techniques, and usually occurs within 10 ms of a change in power dissipation. After 10 ms, additional changes in the output voltage are due to the temperature coefficient of the device.
Figure 1 shows the line and thermal regulation response of a typical MC78T05AC to a 20 W input pulse. The variation of the output voltage due to line regulation is labeled and the thermal regulation component is labeled . Figure 2 shows the load and thermal regulation response of a typical MC78T05AC to a 20 W load pulse. The output voltage variation due to load regulation is labeled and the thermal regulation component is labeled .
Figure 1. MC78T05AC Line and Thermal Regulation Figure 2. MC78T05AC Load and Thermal Regulation
, OUTPUT
O
V
VOLTAGE DEVIATION (V)
18
, INPUT
in
8.0
V
VOLTAGE (V)
Vin = 8.0 V
V I
out
out
= 5.0 V
= 2.0 A
18 V → 8.0 V
2
1
t, TIME (2.0 ms/DIV)
1
= Reg
line
2
= Reg
therm
= 2.4 mV
= 0.0015%VO/W
2
(2.0 mV/DIV)
2
V
VOLTAGE DEVIATION (V)
2.0
, OUTPUT , OUTPUT I
0
OO
CURRENT (A)
V
= 5.0 V
out
Vin = 15 I
= 0 A
out
2
t, TIME (2.0 ms/DIV)
2.0 A → 0 A
1
1
= Reg
= 4.4 mV
line
2
= Reg
= 0.0015%VO/W
therm
(2.0 mV/DIV)
Q4
Q5
Q6 Q7
Q1
Q3
1.0k
300
2.0k
Q11
Q12
3.6k
6.4k
2.6k
6.0k
Q13
1.0k
Q2
Q8
Q10
520
8.0–15 V
5.0 V
3.9k
Q14
Representative Schematic Diagram
Q20
Q9
O
O
6.0k
5.6k
Q17 Q18
Q15
2.8k
3.0k
Q16
40 pF
1.0k
Q19
10pF
Q23
50
Q22
6.7V
16k
300
210
Q24
Q21
100
200
200
Q25
Q26
13
Input
Q27
0.12
Output
Gnd
6
MOTOROLA ANALOG IC DEVICE DATA
1.02
MC78T00 Series
Figure 3. T emperature Stability Figure 4. Output Impedance
0
10
Vin – V
= 10 V
out
I
= 100 mA
out
1.0
NORMALIZED OUTPUT VOLTAGE
.98
–90 –50 –10 30 70 110 150 190
TJ, JUNCTION TEMPERATURE (
°
C)
Figure 5. Ripple Rejection versus Frequency
100
I
= 50 mA
I
= 1.5 A
out
V
out
Vin = 10 V
CO = 0 TJ = 25
out
= 5.0 V
°
C
80
60
40
RR, RIPPLE REJECTION (dB)
1
10–
V
= 5.0 V
out
Vin = 7.5 V I
2
10–
3
10–
, OUTPUT IMPEDANCE ( )
O
r
4
10–
1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M
= 1.0 A
out CO = 0
TJ = 25
°
C
f, FREQUENCY (Hz)
Figure 6. Ripple Rejection versus
Output Current
100
80
V
= 5.0 V
60
RR, RIPPLE REJECTION (dB)
40
out
Vin = 10 V
CO = 0
f = 120 Hz
°
C
TJ = 25
20
1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M f, FREQUENCY (Hz)
Figure 7. Quiescent Current versus
Input Voltage
4.0
3.0
2.0
1.0
, QUIESCENT CURRENT (mA)
B
I
0
010203040
TJ = 0°C
TJ = 125°C
TJ = 0°C TJ = 25°C T
= 125°C
J
Vin, INPUT VOLTAGE (Vdc)
TJ = 25°C
30
0.01 0.1 1.0 10 I
, OUTPUT CURRENT (A)
out
Figure 8. Quiescent Current versus
Output Current
5.0
4.0
3.0
2.0
, QUIESCENT CURRENT (mA)
1.0
B
I
0
0.01 0.1 1.0 10 I
, OUTPUT CURRENT (A)
out
TJ = 0°C
TJ = 125°C
TJ = 25°C
Vin–V
= 5.0 V
out
MOTOROLA ANALOG IC DEVICE DATA
7
Figure 9. Dropout Voltage Figure 10. Peak Output Current
2.5 I
= 3.0 A
out
2.0
I
= 1.0 A
I
out
out
= 0.5 A
1.5
, INPUT TO OUTPUT
out
–V
1.0
in
V
VOLTAGE DIFFERENTIAL (Vdc)
0.5
–90 –50 –10 30 70 110 150 190
VO = 50 mV
TJ, JUNCTION TEMPERATURE (°C)
Figure 11. Line Transient Response Figure 12. Load Transient Response
0.8
V
= 5.0 V
0.6
0.4
0.2
0
DEVIATION (V)
out
–0.2
V
–0.4 –0.6
1.0
0.5
0
CHANGE (V)
, INPUT VOLTAGE , OUTPUT VOL TAGE
in
V
010203040
t, TIME (
out
I
= 150 mA
out
CO = 0 TJ = 25
µ
s)
MC78T00 Series
°
C
, OUTPUT VOL TAGE V
8.0
6.0
4.0
2.0
, PEAK OUTPUT CURRENT (A)
max
I
0
010203040
Vin–VO, INPUT–OUTPUT VOLTAGE (Vdc)
0.3
0.2
0.1 0
–0.1
DEVIATION (V)
out
–0.2 –0.3
1.5
1.0
, OUTPUT
0.5
out
CURRENT (A)
I
0
010203040
Vin = 10 V
CO = 0
°
TJ = 25
t, TIME (
C
µ
s)
TJ = 0°C TJ = 25°C T
= 125°C
J
Figure 13. Maximum Average Power
Dissipation for MC78T00CT, ACT
40
Maximum Ambient
θ
of Heatsinks
30
20
10
, MAXIMUM AVERAGE POWER DISSIPATION (W)P
D(AV)
SA
2.4°C/W
3.3°C/W
6.3°C/W
10.5°C
0
25 50 75 100 125
1.3°C/W
TA, AMBIENT TEMPERATURE (°C)
8
Temperature
Infinite Heatsink
MOTOROLA ANALOG IC DEVICE DATA
MC78T00 Series
APPLICATIONS INFORMATION
Design Considerations
The MC78T00 Series of fixed voltage regulators are designed with Thermal Overload Protection that shuts down the circuit when subjected to an excessive power overload condition, Internal Short Circuit Protection that limits the maximum current the circuit will pass, and Output Transistor Safe–Area Compensation that reduces the output short circuit current as the voltage across the pass transistor is increased.
In many low current applications, compensation capacitors are not required. However, it is recommended that the regulator input be bypassed with a capacitor if the
Figure 14. Current Regulator Figure 15. Adjustable Output Regulator
Input
0.33
µ
F
The MC78T05 regulator can also be used as a current source when connected as above. In order to minimize dissipation the MC78T05 is chosen in this application. Resistor R determines the current as follows:
IB ^ 0.7 mA over line, load and Temperature changes
^
3.5 mA
IB For example, a 2.0 A current source would require R to be a 2.5 10 W resistor and the output voltage compliance would be the input voltage less 7.0 V.
MC78T05
5.0 V
IO =
R
+ I
R
Constant
Current to
Grounded Load
I
O
B
,
regulator is connected to the power supply filter with long wire lengths, or if the output load capacitance is large. An input bypass capacitor should be selected to provide good high frequency characteristics to insure stable operation under all load conditions. A 0.33 µF or larger tantalum, mylar, or other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads directly across the regulator’s input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead.
Output
0.1µF
10k
0.33µF
MC78T05
1.0k
2.5 V
7
6
4
2
3
+
MC1741
Input
VO, 8.0 V to 20 V
Vin – VO The addition of an operational amplifier allows adjustment to higher or
intermediate values while retaining regulation characteristics. The minimum voltage obtainable with this arrangement is 3.0 V greater than the regulator voltage.
Figure 16. Current Boost Regulator
2N4398 or Equiv
R
1.0µF
XX = 2 digits of type number indicating voltage. The MC78T00 series can be current boosted with a PNP transistor. The
2N4398 provides current to 15 A. Resistor R in conjuction with the V the PNP determines when the pass transistor begins conducting; this circuit is not short circuit proof. Input–output differential voltage minimum is increased by the VBE of the pass transistor.
MC78TXX
0.1
Output
µ
F
BE
of
MOTOROLA ANALOG IC DEVICE DATA
Figure 17. Current Boost With
Short Circuit Protection
2N4398
Input R
MJ2955
or Equiv.
R
XX = 2 digits of type number indicating voltage. The circuit of Figure 17 can be modified to provide supply protection
against short circuits by adding a short circuit sense resistor, RSC, and an additional PNP transistor. The current sensing PNP must be able to handle the short circuit current of the three–terminal regulator. Therefore, an eight–ampere power transistor is specified.
sc
1.0
or Equiv.
MC78TXX
µ
F
Output
9
MC78T00 Series
OUTLINE DIMENSIONS
T SUFFIX
PLASTIC PACKAGE
CASE 221A–06
ISSUE Y
SEATING
–T–
PLANE
B
4
Q
123
F
T
A
U
C
S
H
K
Z
L
V
R
J
G
D
N
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED.
DIM MIN MAX MIN MAX
A 0.570 0.620 14.48 15.75 B 0.380 0.405 9.66 10.28 C 0.160 0.190 4.07 4.82 D 0.025 0.035 0.64 0.88 F 0.142 0.147 3.61 3.73 G 0.095 0.105 2.42 2.66 H 0.110 0.155 2.80 3.93
J 0.018 0.025 0.46 0.64 K 0.500 0.562 12.70 14.27 L 0.045 0.060 1.15 1.52 N 0.190 0.210 4.83 5.33 Q 0.100 0.120 2.54 3.04 R 0.080 0.110 2.04 2.79 S 0.045 0.055 1.15 1.39 T 0.235 0.255 5.97 6.47 U 0.000 0.050 0.00 1.27 V 0.045 ––– 1.15 ––– Z ––– 0.080 ––– 2.04
MILLIMETERSINCHES
10
MOTOROLA ANALOG IC DEVICE DATA
MC78T00 Series
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MOTOROLA ANALOG IC DEVICE DATA
11
MC78T00 Series
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12
MOTOROLA ANALOG IC DEVICE DATA
MC78T00/D
*MC78T00/D*
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