? LND317 data sheet general description ? output voltage range adjustable from 1.2v to 37v ? output current capability of 1.5a max ? input regulation typically 0.01% per input-volt change ? output regulation typically 0.1% ? peak output current constant over temperature range of regulator ? popular 3-lead to-220 package ? ripple rejection typically 80 db ? direct replacement for national lm317 features the LND317 is an adjustable 3-terminal positive- voltage regulator capable of supplying 1.5a over a differential voltage range of 3v to 40v. it is exceptionally easy to use and requires only two external resistors to set the output voltage. both input and output regulation is better than standard fixed regulators. in addition to higher performance than fixed regulators, the LND317 has 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 this device is that of a programmable output regulator, but by connecting a fixed resistor between adjustment terminal and the output terminal, the 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. 3-terminal adjustable regulators ? linear dimensions, inc. ? 445 east ohio street, chicago il 60611 usa ? tel 312.321.1810 ? fax 312.321.1830 ? www.lineardimensions.com ? to-220 input output adjust (top view)
(unless otherwise noted) LND317 unit input-to-output differential voltage, v i -v o 40 v continuous total dissipation at 25oc free-air temperature 2w continuous total dissipation at (or below) at 25oc case temperature 15 w operating free-air, case, or virtual junction temperature range 0 to 125 oc storage temperature range -65 to 150 oc lead temperature 1.6mm (1/16 inch) from case for 10 seconds 260 oc LND317 min max unit output current, i o 10 1500 ma operating virtual junction temperature, t j 0 125 oc absolute maximum rating lm317 recommended operating conditions typical application data v LND317 in adjust 0.1 f v in v out v v out out = v ( ) 1 + r2 r1 c1 + i adj r2 (see note a) c2 (see note b) f 1 ref r1 240 r2 ? linear dimensions, inc. ? 445 east ohio street, chicago il 60611 usa ? tel 312.321.1810 ? fax 312.321.1830 ? www.lineardimensions.com ? 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.
LND317 over recommended ranges of operating virtual junction temperature (unless otherwise noted) (see note 1) lm317 parameter test conditions min typ max unit t j =min to max 0.01 0.04 input regulation( see note 2) v i -v o = 3v to 40v, (see note 3) i o =10ma to 1.5a 0.02 0.07 % / v v o =10 v, f=120 hz 65 ripple rejection v o =10 v, f=120 hz 10-f capacitor between adj and ground 66 80 db v o 5v 525 mv i o =10ma to 1.5 a, t j =25oc,(see note3) v o > 5v 0.1 0.5 % v o 5v 20 70 mv output regulation i o =10ma to 1.5a, (see note 3) v o > 5v 0.3 1.5 % output voltage change with temperature t j =min to max 1 % output voltage long-term drift(see note 4) after 1000h at t j =max and v i -v o =40v 0.3 1 % output noise voltage f = 10hz to 10khz, t j= 25oc 0.003 % minimum output current to maintain regulation v i -v o = 40v 3.5 10 ma v i - v o 15v 1.5 2.2 peak output current v i - v o 40v, t j =25oc 0.15 0.4 a adjustment terminal current 50 100 a change in adjustment- terminal current v i -v o =2.5v to 40v, i o =10ma to 1.5a 0.2 5.0 a reference voltage(output to adj) v i - v o = 3v to 40v, i o =10ma to 1.5a, p 15w 1.2 1.25 1.3 v unless otherwise noted, these specifications apply for the following test conditions: v i - v o= 5v and i o= 0.5a. for conditions shown as min or max, use the appropriate value specified under recommended operating conditions. notes: 1. all characteristics are measured with a 0.1-f capacitor across the input and a 1- f capacitor across the output. 2. input regulation is expressed here as the percentage change in output voltage per 1-v change at the input. 3. pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. thermal effects must be taken into account separately. 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. electrical characteristics ? linear dimensions, inc. ? 445 east ohio street, chicago il 60611 usa ? tel 312.321.1810 ? fax 312.321.1830 ? www.lineardimensions.com ?
LND317 ? linear dimensions, inc. ? 445 east ohio street, chicago il 60611 usa ? tel 312.321.1810 ? fax 312.321.1830 ? www.lineardimensions.com ? typical applications v LND317 in out adjust in v v 50 ma constant current battery charger 24 v in v out c1 in adjust LND317 out v v c2 f 10 d1 protects against c1 d2 protects against c2 regulator with protection diodes v in v in adjust LND317 out v adj i out i out ) r1 ( + i adj i ref v = 1.25 v r1 = 10 ma <=i out <= 1.5 a current regulator r2 r1 240 d2 d1 + r1
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