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LM317LA3 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 LM317LA3
기능 Three Terminal Adjustable Output Positive Voltage Regulators
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LM317LA3 데이터시트, 핀배열, 회로
CYStech Electronics Corp.
Spec. No. : C148A3
Issued Date : 2014.03.21
Revised Date :
Page No. : 1/12
Three Terminal Adjustable Output Positive Voltage Regulators
LM317LA3
The LM317LA3 is an adjustable 3–terminal positive voltage regulator capable of supplying in excess of
100mA 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 LM317LA3 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 LM317LA3 can be used as a precision current regulator.
Output Current in Excess of 100m 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
Pb-free lead plating and halogen-free package.
TO-92
AOI
Ordering Information
Device
LM317LA3-0-TB-G
LM317LA3-0-BK-G
Package
TO-92
(Pb-free lead plating and halogen-free package)
TO-92
(Pb-free lead plating and halogen-free package)
Shipping
2000 pcs / Tape & Box
1000 pcs/ bag, 10 bags/box,
10boxes/carton
Environment friendly grade : S for RoHS compliant products, G for RoHS compliant and
green compound products
Packing spec, TB :2000 pcs/tape & box; BK: 1000 pcs / bag, 10 bags/box, 10 boxes/carton
Product rank, zero for no rank products
Product name
LM317LA3
CYStek Product Specification




LM317LA3 pdf, 반도체, 판매, 대치품
CYStech Electronics Corp.
Representative Schematic Diagram
Spec. No. : C148A3
Issued Date : 2014.03.21
Revised Date :
Page No. : 4/12
Vin
VOH-VOL
Line Regulation(%/V)=
×100
VOL
Pulse testing required
1% Duty Cycle is
suggested
Vout
Adjust
Fig 1. Line Regulation and ΔIAdj/Line test circuit
LM317LA3
CYStek Product Specification

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LM317LA3 전자부품, 판매, 대치품
CYStech Electronics Corp.
Spec. No. : C148A3
Issued Date : 2014.03.21
Revised Date :
Page No. : 7/12
Load Regulation
The LM317L is capable of providing extremely good load regulation, but a few precautions are needed to
obtain maximum performance. For best performance, the programming resistor (R1) should be connected
as close to the regulator as possible to minimize line drops which 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.
External Capacitors
A 0.1μF disc or 1.0μF 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 10μF capacitor should improve
ripple rejection about 15 dB at 120 Hz in a 10V application.
Although the LM317L 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 1.0μF
tantalum or 25μF 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.
Fig 6 shows the LM317L with the recommended protection diodes for output voltages in excess of 25V or
high capacitance values (Co>25μF,CAdj>10μF). 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.
Fig 6. Voltage Regulator with Protection Diodes
LM317LA3
CYStek Product Specification

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LM317LA3

Three Terminal Adjustable Output Positive Voltage Regulators

CYStech Electronics
CYStech Electronics

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