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부품번호 | MC78L08ACD 기능 |
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기능 | Three-Terminal Low Current Positive Voltage Regulators | ||
제조업체 | Motorola Semiconductors | ||
로고 | |||
전체 8 페이지수
Order this document by MC78L00/D
Three-Terminal Low Current
Positive Voltage Regulators
The MC78L00, A Series of positive voltage regulators are inexpensive,
easy–to–use devices suitable for a multitude of applications that require a
regulated supply of up to 100 mA. Like their higher powered MC7800 and
MC78M00 Series cousins, these regulators feature internal current limiting
and thermal shutdown making them remarkably rugged. No external
components are required with the MC78L00 devices in many applications.
These devices offer a substantial performance advantage over the
traditional zener diode–resistor combination, as output impedance and
quiescent current are substantially reduced.
• Wide Range of Available, Fixed Output Voltages
• Low Cost
• Internal Short Circuit Current Limiting
• Internal Thermal Overload Protection
• No External Components Required
• Complementary Negative Regulators Offered (MC79L00 Series)
• Available in either ±5% (AC) or ±10% (C) Selections
Representative Schematic Diagram
15k
Q1
3.8k
Q3 Q5
Q4 Q6
Input
Q11
Q12
Q10
5.0k 3.0 Output
0–25k
1.2k
Z1 Q2
420
1.9k 19k 2.2k
C Q9
Q8
Q7
1.0k
2.85k
Ground
ORDERING INFORMATION
Device
Operating
Temperature Range
MC78LXXACD*
MC78LXXACP
MC78LXXCP
TJ = 0° to +125°C
MC78LXXABD*
MC78LXXABP*
TJ = –40° to +125°C
XX indicates nominal voltage
*Available in 5, 8, 9, 12 and 15 V devices.
Package
SOP–8
Plastic Power
Plastic Power
SOP–8
Plastic Power
MC78L00, A
Series
P SUFFIX
CASE 29
Pin 1. Output
2. GND
3. Input
12 3
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8)*
Pin 1. Vout
2. GND
3. GND
4. NC
5. NC
6. GND
7. GND
8. Vin
* SOP–8 is an internally modified SO–8 package.
Pins 2, 3, 6, and 7 are electrically common to the die
attach flag. This internal lead frame modification
decreases package thermal resistance and
increases power dissipation capability when
appropriately mounted on a printed circuit board.
SOP–8 conforms to all external dimensions of the
standard SO–8 package.
Standard Application
Input
Cin*
0.33µF
MC78LXX
Output
CO**
A common ground is required between the input
and the output voltages. The input voltage must
remain typically 2.0 V above the output voltage even
during the low point on the input ripple 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.
DEVICE TYPE/NOMINAL VOLTAGE
10%
5% Voltage
MC78L05C
MC78L08C
MC78L09C
MC78L12C
MC78L15C
MC78L18C
MC78L24C
MC78L05AC
MC78L08AC
MC78L09AC
MC78L12AC
MC78L15AC
MC78L18AC
MC78L24AC
5.0
8.0
9.0
12
15
18
24
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 3
1
MC78L00, A Series
ELECTRICAL CHARACTERISTICS (VI = 23 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, – 40°C < TJ < +125°C (for MC78LXXAB),
S 0°C < TJ < +125°C (for MC78LXXAC), unless otherwise noted.)
MC78L15AC, AB
MC78L15C
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max Unit
Output Voltage (TJ = +25°C)
Line Regulation
(TJ = +25°C, IO = 40 mA)
17.5 Vdc ≤ VI ≤ 30 Vdc
20 Vdc ≤ VI ≤ 30 Vdc
Load Regulation
(TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA)
(TJ = +25°C, 1.0 mA ≤ IO ≤ 40 mA)
Output Voltage
(17.5 Vdc ≤ VI ≤ 30 Vdc, 1.0 mA ≤ IO ≤ 40 mA)
(VI = 23 V, 1.0 mA ≤ IO ≤ 70 mA)
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
(20 Vdc ≤ VI ≤ 30 Vdc)
(1.0 mA ≤ IO ≤ 40 mA)
Output Noise Voltage
(TA = +25°C, 10 Hz ≤ f ≤ 100 kHz)
Ripple Rejection (IO = 40 mA,
f = 120 Hz, 18.5 V ≤ VI ≤ 28.5 V, TJ = +25°C)
Dropout Voltage
(TJ = +25°C)
VO 14.4 15 15.6 13.8 15 16.2 Vdc
Regline
mV
– 130 300 – 130 300
– 110 250 – 110 250
Regload
–
–
25 150
12 75
–
–
mV
25 150
12 75
VO Vdc
14.25 – 15.75 13.5 – 16.5
14.25 – 15.75 13.5 – 16.5
IIB mA
– 4.4 6.5 – 4.4 6.5
– – 6.0 – – 6.0
∆IIB mA
– – 1.5 – – 1.5
– – 0.1 – – 0.2
Vn
– 90 –
– 90 – µV
RR 34 39 – 33 39 – dB
VI – VO
–
1.7
–
– 1.7 – Vdc
ELECTRICAL CHARACTERISTICS (VI = 27 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, 0°C < TJ < +125°C, unless otherwise noted.)
MC78L18AC
MC78L18C
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max Unit
Output Voltage (TJ = +25°C)
Line Regulation
(TJ = +25°C, IO = 40 mA)
21.4 Vdc ≤ VI ≤ 33 Vdc
20.7 Vdc ≤ VI ≤ 33 Vdc
22 Vdc ≤ VI ≤ 33 Vdc
21 Vdc ≤ VI ≤ 33 Vdc
Load Regulation
(TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA)
(TJ = +25°C, 1.0 mA ≤ IO ≤ 40 mA)
Output Voltage
(21.4 Vdc ≤ VI ≤ 33 Vdc, 1.0 mA ≤ IO ≤ 40 mA)
(20.7 Vdc ≤ VI ≤ 33 Vdc, 1.0 mA ≤ IO ≤ 40 mA)
(VI = 27 V, 1.0 mA ≤ IO ≤ 70 mA)
(VI = 27 V, 1.0 mA ≤ IO ≤ 70 mA)
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
(22 Vdc ≤ VI ≤ 33 Vdc)
(21 Vdc ≤ VI ≤ 33 Vdc)
(1.0 mA ≤ IO ≤ 40 mA)
Output Noise Voltage
(TA = +25°C, 10 Hz ≤ f ≤ 100 kHz)
Ripple Rejection (IO = 40 mA,
f = 120 Hz, 23 V ≤ VI ≤ 33 V, TJ = +25°C)
Dropout Voltage
(TJ = +25°C)
VO 17.3 18 18.7 16.6 18 19.4 Vdc
Regline
–
–
45 325
35 275
–
–
32 325 mV
27 275
Regload
–
–
30 170
15 85
–
–
mV
30 170
15 85
VO Vdc
16.2 – 19.8
17.1 – 18.9
16.2 – 19.8
17.1 – 18.9
IIB mA
– 3.1 6.5 – 3.1 6.5
– – 6.0 – – 6.0
∆IIB mA
– – 1.5
– – 1.5
– – 0.1 – – 0.2
Vn
– 150 –
– 150 –
µV
RR 33 48 – 32 46 – dB
VI – VO
–
1.7
–
– 1.7 – Vdc
4 MOTOROLA ANALOG IC DEVICE DATA
4페이지 MC78L00, A Series
APPLICATIONS INFORMATION
Design Considerations
The MC78L00 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 limits the
maximum current the circuit will pass.
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
regulator is connected to the power supply filter with long wire
lengths, or if the output load capacitance is large. The 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 regulators input terminals. Good construction techniques
should be used to minimize ground loops and lead resistance
drops since the regulator has no external sense lead.
Bypassing the output is also recommended.
Figure 7. Current Regulator
Input
0.33µF
MC78L05
R
Constant
Current to
IO Grounded Load
The MC78L00 regulators can also be used as a current source
when connected as above. In order to minimize dissipation the
MC78L05C is chosen in this application. Resistor R determines
the current as follows:
IO =
5.0 V
R
+
IB
IIB = 3.8 mA over line and load changes
For example, a 100 mA current source would require R to be a
50 Ω, 1/2 W resistor and the output voltage compliance would be
the input voltage less 7 V.
Figure 8. ± 15 V Tracking Voltage Regulator
+20V
0.33µF
0.33µF
20V
MC78L15
7 –2
6
MC1741
+3
4
6.5
MPS U55
MPS A70
+VO
10k
10k
–VO
Figure 9. Positive and Negative Regulator
+VI
0.33µF
MC78LXX
+VO
0.1µF
–VI
0.33µF
MC79LXX
0.1µF
–VO
MOTOROLA ANALOG IC DEVICE DATA
7
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MC78L08ACD | Three-Terminal Low Current Positive Voltage Regulators | Motorola Semiconductors |
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