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317LB Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer 317LB
Beschreibung LM317LB
Hersteller ON Semiconductor
Logo ON Semiconductor Logo 




Gesamt 12 Seiten
317LB Datasheet, Funktion
ON Semiconductort
100 mA Adjustable Output,
Positive Voltage Regulator
The LM317L is an adjustable 3–terminal positive voltage regulator
capable of supplying in excess of 100 mA over an output voltage range
of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use
and requires only two external resistors to set the output voltage.
Further, it employs internal current limiting, thermal shutdown and
safe area compensation, making them essentially blow–out proof.
The LM317L serves a wide variety of applications including local,
on card regulation. This device can also be used to make a
programmable output regulator, or by connecting a fixed resistor
between the adjustment and output, the LM317L can be used as a
precision current regulator.
Output Current in Excess of 100 mA
Output Adjustable Between 1.2 V and 37 V
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe–Area Compensation
Floating Operation for High Voltage Applications
Standard 3–Lead Transistor Package
Eliminates Stocking Many Fixed Voltages
Simplified Application
Vin
Cin*
0.1µF
LM317L
IAdj
Adjust
R2
Vout
R1
240
+ CO**
1.0µF
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LM317L
LOW CURRENT
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
Z SUFFIX
PLASTIC PACKAGE
CASE 29
Pin 1. Adjust
2. Vout
3. Vin
1
2
3
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8*)
8
1
Pin 1. Vin
2. Vout
3. Vout
4. Adjust
5. N.C.
6. Vout
7. Vout
8. N.C.
*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 modifi-
cation decreases package thermal resistance
and increases power dissipation capability
when appropriately mounted on a printed circuit
board. SOP–8 conforms to all external dimen-
sions of the standard SO–8 package.
ă* 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.
ǒ ǓVout + 1.25āVā
1
)
R2
R1
) IAdjāāR2
Since IAdj is controlled to less than 100 µA, the error
associated with this term is negligible in most applications.
ORDERING INFORMATION
Operating
Device Temperature Range
Package
LM317LD
LM317LZ
TJ = 0° to +125°C
SOP–8
Plastic
LM317LBD
LM317LBZ TJ = –40° to +125°C
SOP–8
Plastic
© Semiconductor Components Industries, LLC, 2002
January, 2002 – Rev. 3
1
Publication Order Number:
LM317L/D






317LB Datasheet, Funktion
1.260
1.250
1.240
1.230
1.220
LM317L
Vin = 4.2 V
Vout = Vref
IL = 5.0 mA
-50 -25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 11. Temperature Stability
80
70
65
60
55
50
45
40
35
Vin = 6.25 V
Vout = Vref
ąąąąIL = 10 mA
ąąąąIL = 100 mA
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-50 -25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 12. Adjustment Pin Current
0.4 Vin = 4.25 V to 41.25 V
0.2
Vout = Vref
IL = 5 mA
0
-0.2
-0.4
-0.6
-0.8
-1.0
-50 -25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 13. Line Regulation
Bandwidth 100 Hz to 10 kHz
10
8.0
6.0
4.0
-50 -25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 14. Output Noise
1.5
1.0
0.5 CL = 1 µF
0
-0.5
-1.0 Vout = 1.25 V
-1.5
IL = 20 mA
TJ = 25°C
1.0
0.5
CL = 0
Vin
0
0
10 20
t, TIME (µs)
30
40
Figure 15. Line Transient Response
0.3
0.2 CL = 1 µF; CAdj = 10 µF
0.1
0 Vin = 15 V
-0.1
-0.2
CL = 0.3 µF; CAdj = 10 µF
Vout = 10 V
INL = 50 mA
TJ = 25°C
-0.3
100
50 IL
00
10 20 30
t, TIME (µs)
40
Figure 16. Load Transient Response
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317LB pdf, datenblatt
LM317L
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ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
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LM317L/D

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