Maker : Estek Electronics
Part No. : LM317

  Datasheet PDF : LM317.pdf
  Cross Reference : LM317 Cross Reference
  Buy Component : LM317 Find Stock and Price

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Product Information

Description The 3 1 7 are adjustable 3 - terminal positive -voltage regulators capable of supplying 1.5A over a differential voltage range of 3Vto 40V. They are exceptionally easy to use and require only two external resistors to set the output voltage. Both input and output regulation are better than standard fixed regulators.In addition to higher performance than fixed regulators, these regulators offer full overload protection available only in integrated circuits. Included on the chip are current limit, thermal overload protection, and safe-area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Normally, no capacitors are needed unless the device is situated far from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient response.The primary applications of each of these regulators is that of a programmable output regulator, but by connecting a fixed resistor between adjustment terminal and the output terminal, each device can be used as a precision current regulator. Even though the regulator is floating and sees only the input-to-output differential voltage, use of these www.DataSheet4U.comdevices to regulate output voltages that would cause the maximum-rated differential voltage to be exceeded if the output became shorted to ground is not recommended. Features • Output Voltage Range Adjustable from 1.2 V to 37 V • Output Current Capability of 1.5 A Max • Input Regulation Typically 0.01 % Per Input - Volt Change • Output Regulation Typically 0.1 % • Peak Output Current Constant Over Range of Regulator • Popular 3-Lead TO-220 Package • Ripple Rejection Typically 80 dB Temperature Typical application data 2 R1 240 Ω V 3 I IN 317 ADJ 1 OUT V 0 (see Note C) C1 = 0.1 µ F (see Note A) R2 C2 = 1 (see Note B) Note A: Use of an input bypass capacitor is recommended if regulator is far from filter capacitors. Note B: Use of an output capacitor improves transient response but is optional. Note C: Output voltage is calculated from the equation: 0 =  R   V 1 Vref   + 1 R Vref equals the difference between the output and adjustment terminal BEIJING ESTEK ELECTRONICS CO.,LTD 1 Absolute Maximum Ratings OVER OPERATING TEMPERATURE RANGE (UNLESS OTHERWISE NOTED) Parameter Maximum Units Input-to-output differential voltage, VI - Vo Continuous total dissipation at 25 °free-air temperature C Continuous total dissipation at (or below) 25 °case temperature C Operating free-air, case, or virtual junction temperature range Storage temperature range 40 2 15 0 to 125 -65 to 150 V W W ° C ° C www.DataSheet4U.com Recommended Operating Conditions Parameter Output current, I0 Operating virtual junction temperature, T J min 10 0 LM 317 max 1500 125 Units mA ° C Electrical Characteristics Electrical Characteristics over recommended ranges of operating virtual junction temperature (unless other wise noted) (Note 1) Parameter Test Conditions* 317 Min Input regulation (Note 2) Ripple rejection VI-V0=3 V to 40 V, (Note 3) Vo=10 V, f=120 Hz Vo=10 V, f=120 Hz 10-µ capacitor between ADJ and ground F Output regulation lo = 10 mA to 1.5 A, TJ= 25 ° (See Note 3) C, lo = 10 mA to 1.5 A, (Note 3) TJ = MIN to MAX Vo ≤5 V Vo > 5 V Vo ≤ 5 V Vo > 5 V 66 TJ = MIN to MAX l0 = 10 mA to 1.5 A Typ 0.01 0.02 65 80 5 0.1 20 0.3 1 25 0.5 70 1.5 mV % mV % % Max 0.04 0.07 dB %/ V Units Output voltage change with temperature Output voltage long-term drift (Note 4) Output noise voltage Minimum output current to maintain regulation Peak output current Adjustment-terminal current Change in adjustment-terminal current Reference voltage (output to ADJ ) After 1000 h at TJ = MAX and VI-Vo =40 V f= 10 Hz to 10 kHz, TJ =25° C VI-Vo = 40 V VI-Vo ≤ 15 V VI-Vo ≤ 40 V, TJ =25° C VI-Vo=2.5 V to 40 V, lo = 10 mA to 1.5 A VI-Vo = 3 V to 40 V, lo=10 mA to 1.5 A, P ≤ 15W 1.2 1....

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