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317B 데이터시트 PDF




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부품번호 317B 기능
기능 THREE.TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR
제조업체 ON Semiconductor
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317B 데이터시트, 핀배열, 회로
Order this document by LM317/D
Three-Terminal Adjustable
Output Positive Voltage
Regulator
The LM317 is an adjustable 3–terminal positive voltage regulator capable
of supplying in excess of 1.5 A 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 it
essentially blow–out proof.
The LM317 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 LM317 can be used as a precision current regulator.
Output Current in Excess of 1.5 A
Output Adjustable between 1.2 V and 37 V
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting Constant with Temperature
Output Transistor Safe–Area Compensation
Floating Operation for High Voltage Applications
Available in Surface Mount D2PAK, and Standard 3–Lead Transistor
Package
Eliminates Stocking many Fixed Voltages
LM317
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
1
2
3
Vin
Cin*
0.1 µF
Standard Application
LM317
IAdj Adjust
Vout
R1
240
+ CO**
1.0 µF
R2
+ ǒ ) Ǔ )** 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.
Vout
1.25 V 1
R2
R1
IAdj R2
Since IAdj is controlled to less than 100 µA, the error associated with this term is
negligible in most applications.
MOTOROLA ANALOG IC DEVICE DATA
Pin 1. Adjust
2. Vout
3. Vin
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
(D2PAK)
12
3
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
LM317BD2T
Surface Mount
TJ = – 40° to +125°C
LM317BT
Insertion Mount
LM317D2T
LM317T
Surface Mount
TJ = 0° to +125°C Insertion Mount
© Motorola, Inc. 1996
Rev 1
1




317B pdf, 반도체, 판매, 대치품
VI Vin
Cin 0.1 µF
LM317
Figure 2. Load Regulation and IAdj/Load Test Circuit
LM317
Vout
IL
Adjust
IAdj
R1
240
1%
+
CO 1.0 µF
RL
(max Load)
*
RL
(min Load)
VO (min Load)
VO (max Load)
* Pulse testing required.
R2 * 1% Duty Cycle is suggested.
1%
Load Regulation (mV) = VO (min Load) – VO (max Load)
VO (min Load) – VO (max Load)
Load Regulation (% VO) =
VO (min Load)
x 100
Figure 3. Standard Test Circuit
Vin
LM317
Vout
IL
VI
Cin 0.1 µF
Adjust
IAdj
ISET
R2
1%
R1
240
1%
Vref
RL
+
CO 1.0 µF
VO
* Pulse testing required.
* 1% Duty Cycle is suggested.
To Calculate R2: Vout = ISET R2 + 1.250 V
To Calculate R2: Assume ISET = 5.25 mA
24 V
14 V
f = 120 Hz
Figure 4. Ripple Rejection Test Circuit
Vin Vout
LM317
Cin 0.1 µF
Adjust
R2
1.65 k
1%
R1
240
1%
D1*
1N4002
CO
+
1.0 µF
RL
Vout = 10 V
VO
+
CAdj 10 µF
* D1 Discharges CAdj if output is shorted to Ground.
4 MOTOROLA ANALOG IC DEVICE DATA

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317B 전자부품, 판매, 대치품
LM317
APPLICATIONS INFORMATION
Basic Circuit Operation
The LM317 is a 3–terminal floating regulator. In operation,
the LM317 develops and maintains a nominal 1.25 V
reference (Vref) between its output and adjustment terminals.
This reference voltage is converted to a programming current
(IPROG) by R1 (see Figure 17), and this constant current flows
through R2 to ground.
The regulated output voltage is given by:
+ ǒ ) Ǔ )Vout
Vref 1
R2
R1
IAdj R2
Since the current from the adjustment terminal (IAdj)
represents an error term in the equation, the LM317 was
designed to control IAdj to less than 100 µA and keep it
constant. To do this, all quiescent operating current is
returned to the output terminal. This imposes the requirement
for a minimum load current. If the load current is less than this
minimum, the output voltage will rise.
Since the LM317 is a floating regulator, it is only the
voltage differential across the circuit which is important to
performance, and operation at high voltages with respect to
ground is possible.
Figure 17. Basic Circuit Configuration
Vin
LM317
Adjust
Vout
Vref
+
R1
IPROG
Vout
External Capacitors
A 0.1 µF disc or 1.0 µF tantalum input bypass capacitor
(Cin) is recommended to reduce the sensitivity to input line
impedance.
The adjustment terminal may be bypassed to ground to
improve ripple rejection. This capacitor (CAdj) prevents ripple
from being amplified as the output voltage is increased. A
10 µF capacitor should improve ripple rejection about 15 dB
at 120 Hz in a 10 V application.
Although the LM317 is stable with no output capacitance,
like any feedback circuit, certain values of external
capacitance can cause excessive ringing. An output
capacitance (CO) in the form of a 1.0 µF tantalum or 25 µF
aluminum electrolytic capacitor on the output swamps this
effect and insures stability.
Protection Diodes
When external capacitors are used with any IC regulator it
is sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator.
Figure 18 shows the LM317 with the recommended
protection diodes for output voltages in excess of 25 V or high
capacitance values (CO > 25 µF, CAdj > 10 µF). Diode D1
prevents CO from discharging thru the IC during an input
short circuit. Diode D2 protects against capacitor CAdj
discharging through the IC during an output short circuit. The
combination of diodes D1 and D2 prevents CAdj from
discharging through the IC during an input short circuit.
Figure 18. Voltage Regulator with Protection Diodes
IAdj
Vref = 1.25 V Typical
Load Regulation
R2
Vout
D1
1N4002
Vin
LM317
The LM317 is capable of providing extremely good load
regulation, but a few precautions are needed to obtain
Cin
maximum performance. For best performance, the
Adjust
programming resistor (R1) should be connected as close to
the regulator as possible to minimize line drops which
R2
effectively appear in series with the reference, thereby
degrading regulation. The ground end of R2 can be returned
near the load ground to provide remote ground sensing and
improve load regulation.
Figure 19. D2PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
80 3.5
PD(max) for TA = +50°C
70 Free Air
3.0
Mounted
Vertically
60
50 Minimum
Size Pad
40
2.0 oz. Copper 2.5
L
ÎÎÎÎ 2.0
L
ÎÎÎÎÎÎÎÎ 1.5
RθJA
30 1.0
0 5.0 10 15 20 25 30
L, LENGTH OF COPPER (mm)
Vout
+
R1 D2 CO
1N4002
CAdj
MOTOROLA ANALOG IC DEVICE DATA
7

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