Hoja tecnica lm317

Páginas: 4 (874 palabras) Publicado: 7 de junio de 2011
www.fairchildsemi.com

LM317

3-Terminal Positive Adjustable Regulator
Features
• • • • • • Output Current In Excess of 1.5A Output Adjustable Between 1.2V and 37V Internal Thermal OverloadProtection Internal Short Circuit Current Limiting Output Transistor Safe Operating Area Compensation TO-220 Package

Description
This monolithic integrated circuit is an adjustable 3-terminalpositive voltage regulator designed to supply more than 1.5A of load current with an output voltage adjustable over a 1.2V to 37V. It employs internal current limiting, thermal shut-down and safe areacompensation.
TO-220
Output

1

1. Adj 2. Output 3. Input

Internal Block Diagram
Vin 3
Input

+ -

Voltage Reference

Protection Circuitry

Rlimit

2 Vo
Output

1 Adj Vadj

Rev.1.0.4
©2009 Fairchild Semiconductor Corporation

LM317

Absolute Maximum Ratings
Parameter Input-Output Voltage Differential Lead Temperature Power Dissipation Operating Junction TemperatureRange Storage Temperature Range Temperature Coefficient of Output Voltage Symbol VI - VO TLEAD PD Tj TSTG ΔVo/ΔT Value 40 230 Internally limited 0 ~ +125 -65 ~ +125 ±0.02 Unit V °C W °C °C %/°C

Note 1:Absolute Maximum Ratings: are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in theElectrical Characteristics tables are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation.

ElectricalCharacteristics
(VI-VO = 5V, IO = 0.5A, 0°C ≤ TJ ≤ +125°C, IMAX = 1.5A, PDMAX = 20W, unless otherwise specified) Parameter Line Regulation (Note2) Symbol Rline Conditions TA = +25°C 3V ≤ VI - VO ≤ 40V 3V ≤VI - VO ≤ 40V TA = +25°C, 10mA ≤ IO ≤ IMAX VO< 5V VO ≥ 5V 10mA ≤ IO ≤ IMAX VO < 5V VO ≥ 5V 3V ≤ VI - VO ≤ 40V 10mA ≤ IO ≤ IMAX PD ≤ PMAX 3V ≤ VIN - VO ≤ 40V 10mA ≤ IO ≤ IMAX PD ≤ PMAX VI - VO = 40V...
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