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Datasheet LM317LA3 PDF ( 特性, スペック, ピン接続図 )

部品番号 LM317LA3
部品説明 Three Terminal Adjustable Output Positive Voltage Regulators
メーカ CYStech Electronics
ロゴ CYStech Electronics ロゴ 
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LM317LA3 Datasheet, LM317LA3 PDF,ピン配置, 機能
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

1 Page



LM317LA3 pdf, ピン配列
CYStech Electronics Corp.
Long-Term Stability(Note 3) S
TJ=125, 1000Hrs
-
Spec. No. : C148A3
Issued Date : 2014.03.21
Revised Date :
Page No. : 3/12
0.3 -
%
Notes:1.Load and line 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.
2.CAdj, when used, is connected between the adjustment pin and ground.
3.Since long-term stability cannot be measured on each device before shipment, this specification is an engineering
estimate of average stability from lot to lot.
Typical Characteristics
Reference Voltage vs Temperature
1.26
1.255
1.25
1.245
1.24
1.235
-50 -25
0 25 50 75
Temperature(℃)
100 125
Dropout Voltage vs Input-Output Voltage Difference
3
2.5
2
1.5
1
0 25 50 75 100 125
Temperature(℃)
Adjustment Current vs Temperature
60
55
50
45
40
35
-50
-25
0 25 50 75
Temperature(℃)
100 125
LM317LA3
CYStek Product Specification


3Pages


LM317LA3 電子部品, 半導体
CYStech Electronics Corp.
Spec. No. : C148A3
Issued Date : 2014.03.21
Revised Date :
Page No. : 6/12
Fig 4. Ripple Rejection Test Circuit
Application Information
Basic Circuit Operation
The LM317L is a 3-terminal floating regulator. In operation, the LM317L develops and maintains a
nominal 1.25V reference (Vref) between its output and adjustment terminals. This reference voltage is
converted to a programming current (Iprog) by R1(see Fig 5), and this constant current flows through R2 to
ground. The regulated output voltage is given by:
(Vout=Vref 1+R2/R1)+IAdjR2
Since the current from the adjustment terminal (IAdj) represents an error term in the equation, the LM317L
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 LM317L 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.
LM317LA3
Fig 5. Basic Circuit Configuration
CYStek Product Specification

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