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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 devices 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
V
3
I
IN
317 ADJ 1
OUT
V 0
(see Note C)
C1 = 0.1 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 V1 Vref + 1 R
Vref equals the difference between the output and adjustment terminal
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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
Recommended Operating Conditions
Parameter Output current, I0 Operating virtual junction temperature, TJ 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- 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 1.5 0.15
0.3 0.003 3.5 2.2 0.4 50 0.2 1.25
1
% % mA A
10
100 5.0 1.3
A A V
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* Unless otherwise noted, these specifications apply for the following test conditions: VI - V0 = 5V and I0 = 0.5 A. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. Note 1: All characteristics are measured with a 0.1 - capacitor across the input and a 1 - capacitor across the output. F F Note 2: Input regulation is expressed here as the percentage change in output voltage per 1 - V change at the input. Note 3: Pulse testing techniques are used to maintain the junction temperature as close to the ambient tempe rature as possible. Thermal effects must be taken into account separately. Note 4: Since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to be a guarantee or warranty. It is an engineering estimate of the average drift to be expected from lot to lot.
Ordering Information
O RDERING NU MB ER LM317 P ACK AGE TO - 220 M AR KING LM317
Address :
Postalcode:100039 Tel: 86-010-58895780 / 81 / 82 / 83 / 84 Http://www.estek.com.cn Email:sales@estek.com.cn
6A06--6A07 Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing
Fax : 010-58895793
REV No:01-060808
BEIJING ESTEK ELECTRONICS CO.,LTD
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