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features and benefits ? no external sense resistor required; single package solution ? reduced power loss: ? 0.6 m internal conductor resistance on ex package ? 1.2 m internal conductor resistance on lc package ? economical low- and high-side current sensing ? output voltage proportional to ac or dc currents ? 12.5 a and 25 a full scale sensing ranges on lc package ? 15.5 a and 31 a full scale sensing ranges on ex package ? overcurrent f a u l t trips and l atches at 100% of full-scale current ? low-noise analog signal path ? 100 khz bandwidth ? small footprint, low-profile soic8 and qfn packages ? 3.0 to 5.5 v, single supply operation ? integrated electrostatic shield for output stability ? factory-trimmed for accuracy ? extremely stable output offset voltage ? zero magnetic hysteresis ? ratiometric output from supply voltage description the allegro ? ACS711 provides economical and precise solutions for ac or dc current sensing in <100 v audio, communications systems, and white goods. the device package allows for easy implementation by the customer. typical applications include circuit protection, current monitoring, and motor and inverter control. the device consists of a linear hall sensor circuit with a copper conduction path located near the surface of the die. applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated hall ic and converted into a proportional voltage. device accuracy is optimized through the close proximity of the magnetic signal to the hall transducer. the output of the device has a positive slope proportional to the current flow from ip+ to ip? (pins 1 and 2, to pins 3 and 4). the internal resistance of this conductive path is 0.6 m for the ex package, and 1.2 m for the lc package, providing a non-intrusive measurement interface that saves power in applications that require energy efficiency. the ACS711 is optimized for low-side current sensing applications, although the terminals of the conductive path are electrically isolated from the sensor ic leads, providing sufficient internal creepage and clearance dimensions for a low ac or dc working voltage applications. the thickness ip+ ip+ ip? ip? i p gnd ACS711 +3.3 v viout vcc c byp 0.1 f c load r pu fault ACS711 ACS711a-ds hall effect linear current sensor with overcurrent fault output for <100 v isolation applications continued on the next page? approximate scale 1:1 packages: typical application 8-pin soicn with internally fused path (lc package) 12-contact qfn 3 mm 3 mm 0.75 mm (ex package) application 1. the ACS711 outputs an analog signal, v iout , that varies linearly with the bi-directional ac or dc primary current, i p , within the range specified. the f a u l t pin trips when i p reaches 100% of its full-scale current.
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 2 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com absolute maximum ratings characteristic symbol notes rating units supply voltage v cc 7v reverse supply voltage v rcc ?0.1 v output voltage v iout 7v reverse output voltage v riout ?0.1 v working voltage for basic isolation v working voltage applied between pins 1-4 and 5-8 100 vac peak or vdc f a u l t pin voltage v fault 7v overcurrent transient tolerance i poc 1 pulse, 100 ms 100 a nominal operating ambient temperature t a range e ?40 to 85 oc range k ?40 to 125 oc maximum junction temperature t j (max) 165 oc storage temperature t stg ?65 to 170 oc selection guide part number package packing 1 t a (c) optimized accuracy range, i p (a) sensitivity 2 , sens (typ) (mv/a) ACS711elctr-12ab-t 8-pin soicn 3000 pieces/reel ?40 to 85 12.5 110 ACS711elctr-25ab-t 8-pin soicn 3000 pieces/reel ?40 to 85 25 55 ACS711klctr-12ab-t 8-pin soicn 3000 pieces/reel ?40 to 125 12.5 110 ACS711klctr-25ab-t 8-pin soicn 3000 pieces/reel ?40 to 125 25 55 ACS711eexlt-15ab-t 3 12-contact qfn with fused current loop 1500 pieces/reel ?40 to 85 15.5 90 ACS711eexlt-31ab-t 3 12-contact qfn with fused current loop 1500 pieces/reel ?40 to 85 31 45 ACS711kexlt-15ab-t 3 12-contact qfn with fused current loop 1500 pieces/reel ?40 to 125 15.5 90 ACS711kexlt-31ab-t 3 12-contact qfn with fused current loop 1500 pieces/reel ?40 to 125 31 45 1 contact allegro for additional packing options. 2 sensitivity measured with v cc = 3.3 v. 3 qfn package not qualified for automotive applications. of the copper conductor allows survival of the device at up to 5 overcurrent conditions. the ACS711 is provided in small, surface mount packages: soic8 and qfn12. the leadframe is plated with 100% matte tin, which is compatible with standard lead (pb) free printed circuit board assembly processes. internally, the device is pb-free, except for flip-chip high-temperature pb-based solder balls, currently exempt from rohs. the device is fully calibrated prior to shipment from the factory. description (continued)
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 3 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com vcc viout 240 k fault gnd dynamic offset cancellation ip+ ip+ ip ip sensitivity trim signal recovery power-on reset d reset master current supply sensitivity temperature coefficient trim to all subcircuits current fault comparator 0 ampere offset adjust hall current drive c load c byp r pu v cc ip+ ip+ ip? ip? vcc viout fault gnd 1 2 3 4 8 7 6 5 10 9 8 7 1 2 3 4 5 6 12 11 vcc viout gnd fault nc nc nc nc ip+ ip+ ip? ip? terminal list table name number description ex lc gnd 5 5 signal ground terminal f a u l t 6 6 overcurrent fault; active low ip? 3 and 4 3 and 4 terminals for current being sensed; fused internally ip+ 1 and 2 1 and 2 terminals for current being sensed; fused internally nc 7, 8, 9, 10 ? no connection vcc 12 8 device power supply terminal viout 11 7 analog output signal functional block diagram pin-out diagrams lc package ex package
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 4 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com common operating characteristics over full range of t a and v cc = 3.3 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units electrical characteristics supply voltage 1 v cc 3 3.3 5.5 v supply current i cc v cc = 3.3 v, output open ? 4 5.5 ma output capacitance load c load viout to gnd ? ? 1 nf output resistive load r load viout to gnd 15 ? ? k primary conductor resistance r ip ex package, t a = 25c ? 0.6 ? m lc package, t a = 25c ? 1.2 ? m viout rise time t r i p = i pmax , t a = 25c, cout = open ? 3.5 ? s propagation delay time t prop i p = i p (max), t a = 25c, cout = open ? 1.2 ? s response time t response i p = i p (max), t a = 25c, cout = open ? 4.6 ? s internal bandwidth 2 bw i ?3 db, t a = 25c ? 100 ? khz nonlinearity e lin over full range of i p ?1?% symmetry e sym apply full scale i p ? 100 ? % viout saturation voltages v ioh v cc ? 0.3 ??v v iol ? ? 0.3 v quiescent output voltage v iout(q) i p = 0 a, t a = 25c ? v cc / 2 ? v power-on time t po output reaches 90% of steady-state level, t a = 25c, 20 a present on primary conductor ?35? s f a u l t pin characteristics f a u l t operating point i fault ? 1 x i p ?a f a u l t output pullup resistor r pu 1??k f a u l t output voltage v oh ? v cc ? 0.3 ?v v ol r pu = 1 k ? 0.3 ? v f a u l t response time t fault measured from | i p | > | i fault | to v fault v ol ? 1.3 ? s v cc off voltage level for fault reset 3 v ccfr ? ? 200 mv v cc off duration for fault reset 3 t ccfr 100 ? ? s 1 devices are programmed for maximum accuracy at 3.3 v v cc levels. the device contains ratiometry circuits that accurately alter the 0 a output voltage and sensitivity level of the device in proportion to the applied v cc level. however, as a result of minor nonlinearities in the ratiometry circuit additional output error will result when v cc varies from the 3.3 v v cc level. customers that plan to operate the device from a 5 v regulated supply should contact their local allegro sales representative regarding expected device accuracy levels under these bias conditions. 2 calculated using the formula bw i = 0.35 / t r . 3 after the f a u l t pin is latched low, the only way to reset it is through a power-off and power-on cycle on the vcc pin. for fault reset, v cc must stay below v ccfr for a period greater than t ccfr before settling to the normal operation voltage (3 to 5.5 v).
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 5 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com x12ab performance characteristics for lc package and e temperature range 1 t a = 25c and v cc = 3.3 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units optimized accuracy range i p ?12.5 ? 12.5 a sensitivity sens over full range of i p ? 110 ? mv/a full scale of i p applied for 5 ms, t a = ?40c to 25c ? 110 ? mv/a full scale of i p applied for 5 ms, t a = 25c to 85c ? 110 ? mv/a noise 2 v noise t a = 25 c, no external low pass filter on viout ? 11 ? mv electrical offset voltage v oe(ta) i p = 0 a, t a = 25c ? 5 ? mv v oe(top)ht i p = 0 a, t a = 25c to 85c ? 40 ? mv v oe(top)lt i p = 0 a, t a = ?40c to 25c ? 50 ? mv total output error 3 e tot i p = 12.5 a,t a = ?40c to 85c ? 5 ? % 1 see characteristic performance data for parameter distributions over temperature. 2 3 sigma noise voltage. 3 percentage of i p , with i p = 12.5 a. x12ab performance characteristics for lc package and k temperature range 1 t a = 25c and v cc = 3.3 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units optimized accuracy range i p ?12.5 ? 12.5 a sensitivity sens over full range of i p ? 110 ? mv/a full scale of i p applied for 5 ms, t a = ?40c to 25c ? 110 ? mv/a full scale of i p applied for 5 ms, t a = 25c to 125c ? 110 ? mv/a noise 2 v noise t a = 25 c, no external low pass filter on viout ? 11 ? mv electrical offset voltage v oe(ta) i p = 0 a, t a = 25c ? 5 ? mv v oe(top)ht i p = 0 a, t a = 25c to 125c ? 40 ? mv v oe(top)lt i p = 0 a, t a = ?40c to 25c ? 50 ? mv total output error 3 e tot i p = 12.5 a,t a = ?40c to 125c ? 5 ? % 1 see characteristic performance data for parameter distributions over temperature. 2 3 sigma noise voltage. 3 percentage of i p , with i p = 12.5 a.
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 6 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com x25ab performance characteristics for lc package and k temperature range 1 t a = 25c and v cc = 3.3 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units optimized accuracy range i p ?25 ? 25 a sensitivity sens over full range of i p ? 55 ? mv/a full scale of i p applied for 5 ms, t a = ?40c to 25c ? 55 ? mv/a full scale of i p applied for 5 ms, t a = 25c to 125c ? 55 ? mv/a noise 2 v noise t a = 25 c, no external low pass filter on viout ? 8 ? mv electrical offset voltage v oe(ta) i p = 0 a, t a = 25c ? 5 ? mv v oe(top)ht i p = 0 a, t a = 25c to 125c ? 30 ? mv v oe(top)lt i p = 0 a, t a = ?40c to 25c ? 35 ? mv total output error 3 e tot i p =25 a, t a = ?40c to 125c ? 4 ? % 1 see characteristic performance data for parameter distributions over temperature. 2 3 sigma noise voltage. 3 percentage of i p , with i p = 25 a. x25ab performance characteristics for for lc package and e temperature range 1 t a = 25c and v cc = 3.3 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units optimized accuracy range i p ?25 ? 25 a sensitivity sens over full range of i p ? 55 ? mv/a full scale of i p applied for 5 ms, t a = ?40c to 25c ? 55 ? mv/a full scale of i p applied for 5 ms, t a = 25c to 85c ? 55 ? mv/a noise 2 v noise t a = 25 c, no external low pass filter on viout ? 8 ? mv electrical offset voltage v oe(ta) i p = 0 a, t a = 25c ? 5 ? mv v oe(top)ht i p = 0 a, t a = 25c to 85c ? 30 ? mv v oe(top)lt i p = 0 a, t a = ?40c to 25c ? 35 ? mv total output error 3 e tot i p =25 a, t a = ?40c to 85c ? 4 ? % 1 see characteristic performance data for parameter distributions over temperature. 2 3 sigma noise voltage. 3 percentage of i p , with i p = 25 a.
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 7 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com x12ab performance characteristics for ex package and e temperature range 1 t a = 25c and v cc = 3.3 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units optimized accuracy range i p ?15.5 ? 15.5 a sensitivity sens over full range of i p ? 90 ? mv/a full scale of i p applied for 5 ms, t a = ?40c to 25c ? 90 ? mv/a full scale of i p applied for 5 ms, t a = 25c to 85c ? 90 ? mv/a noise 2 v noise t a = 25 c, no external low pass filter on viout ? 11 ? mv electrical offset voltage v oe(ta) i p = 0 a, t a = 25c ? 5 ? mv v oe(top)ht i p = 0 a, t a = 25c to 85c ? 40 ? mv v oe(top)lt i p = 0 a, t a = ?40c to 25c ? 50 ? mv total output error 3 e tot i p = 12.5 a,t a = ?40c to 85c ? 5 ? % 1 see characteristic performance data for parameter distributions over temperature. 2 3 sigma noise voltage. 3 percentage of i p , with i p = 15.5 a. x12ab performance characteristics for ex package and k temperature range 1 t a = 25c and v cc = 3.3 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units optimized accuracy range i p ?15.5 ? 15.5 a sensitivity sens over full range of i p ? 90 ? mv/a full scale of i p applied for 5 ms, t a = ?40c to 25c ? 90 ? mv/a full scale of i p applied for 5 ms, t a = 25c to 125c ? 90 ? mv/a noise 2 v noise t a = 25 c, no external low pass filter on viout ? 11 ? mv electrical offset voltage v oe(ta) i p = 0 a, t a = 25c ? 5 ? mv v oe(top)ht i p = 0 a, t a = 25c to 125c ? 40 ? mv v oe(top)lt i p = 0 a, t a = ?40c to 25c ? 50 ? mv total output error 3 e tot i p = 12.5 a,t a = ?40c to 125c ? 5 ? % 1 see characteristic performance data for parameter distributions over temperature. 2 3 sigma noise voltage. 3 percentage of i p , with i p = 15.5 a.
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 8 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com x25ab performance characteristics for ex package and k temperature range 1 t a = 25c and v cc = 3.3 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units optimized accuracy range i p ?31 ? 31 a sensitivity sens over full range of i p ? 45 ? mv/a full scale of i p applied for 5 ms, t a = ?40c to 25c ? 45 ? mv/a full scale of i p applied for 5 ms, t a = 25c to 125c ? 45 ? mv/a noise 2 v noise t a = 25 c, no external low pass filter on viout ? 8 ? mv electrical offset voltage v oe(ta) i p = 0 a, t a = 25c ? 5 ? mv v oe(top)ht i p = 0 a, t a = 25c to 125c ? 30 ? mv v oe(top)lt i p = 0 a, t a = ?40c to 25c ? 35 ? mv total output error 3 e tot i p =25 a, t a = ?40c to 125c ? 4 ? % 1 see characteristic performance data for parameter distributions over temperature. 2 3 sigma noise voltage. 3 percentage of i p , with i p = 31 a. x25ab performance characteristics for for ex package and e temperature range 1 t a = 25c and v cc = 3.3 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units optimized accuracy range i p ?31 ? 31 a sensitivity sens over full range of i p ? 45 ? mv/a full scale of i p applied for 5 ms, t a = ?40c to 25c ? 45 ? mv/a full scale of i p applied for 5 ms, t a = 25c to 85c ? 45 ? mv/a noise 2 v noise t a = 25 c, no external low pass filter on viout ? 8 ? mv electrical offset voltage v oe(ta) i p = 0 a, t a = 25c ? 5 ? mv v oe(top)ht i p = 0 a, t a = 25c to 85c ? 30 ? mv v oe(top)lt i p = 0 a, t a = ?40c to 25c ? 35 ? mv total output error 3 e tot i p =25 a, t a = ?40c to 85c ? 4 ? % 1 see characteristic performance data for parameter distributions over temperature. 2 3 sigma noise voltage. 3 percentage of i p , with i p = 31 a.
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 9 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com thermal characteristics characteristic symbol test conditions 1 value units package thermal resistance, junction to lead r jl lc package, mounted on allegro asek 711 evalua- tion board 5 oc/w package thermal resistance, junction to ambient 2 r ja lc package, mounted on allegro 85-0404 evaluation board, includes the power consumed by the board 23 oc/w ex package, mounted on allegro 85-0528 evaluation board, includes the power consumed by the board 24 oc/w 1 additional thermal information available on the allegro website 2 the allegro evaluation board has 1500 mm 2 of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. performance values include the power consumed by the pcb. further details on the board are available fro m the frequently asked questions document on our website.
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 10 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com characteristic performance data data taken using the ACS711klc-12a, v cc = 3.3 v mean typical maximum limit typical minimum limit 80 60 40 20 0 -20 -40 -60 ?60 60 140 80 100 120 ?40 40 ?20 20 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 114 113 112 111 110 109 108 107 101.5 101.0 100.5 100.0 99.5 99.0 98.5 v oe (mv) e lin (%) sens (mv/a) e sym (%) t a (c) t a (c) t a (c) t a (c) 8 6 4 2 0 -2 -4 -6 e tot (%) t a (c) i fault (a) t a (c) 16 14 12 10 8 6 4 2 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 electrical offset voltage versus ambient temperature nonlinearity versus ambient temperature sensitivity versus ambient temperature symmetry versus ambient temperature total output error versus ambient temperature fault operating point versus ambient temperature accuracy data
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 11 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com characteristic performance data data taken using the ACS711klc-25a, v cc = 3.3 v accuracy data mean typical maximum limit typical minimum limit 40 30 20 10 0 -10 -20 -30 -40 ?60 60 140 80 100 120 ?40 40 ?20 20 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 57.0 56.5 56.0 55.5 55.0 54.5 54.0 53.5 100.8 100.6 100.4 100.2 100.0 99.8 99.6 99.4 99.2 99.0 v oe (mv) e lin (%) sens (mv/a) e sym (%) t a (c) t a (c) t a (c) t a (c) 5 4 3 2 1 0 -1 -2 -3 -4 e tot (%) t a (c) i fault (a) t a (c) 30 25 20 15 10 5 0 ?60 60 140 80 100 120 ?40 40 ?20 20 0 electrical offset voltage versus ambient temperature nonlinearity versus ambient temperature sensitivity versus ambient temperature symmetry versus ambient temperature total output error versus ambient temperature fault operating point versus ambient temperature
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 12 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com characteristic performance data data taken using the ACS711klc-25a timing data i p (10 a/div.) 3.47 s v iout (0.5 v/div.) t (2 s/div.) i p (10 a/div.) i p (10 a/div.) v iout (0.5 v/div.) fault (2 v/div.) t (2 s/div.) t (2 s/div.) i p (10 a/div.) v iout (0.5 v/div.) t (2 s/div.) 4.62 s 1.28 s 1.24 s response time propagation delay time fault response rise time
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 13 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com sensitivity (sens). the change in sensor output in response to a 1 a change through the primary conductor. the sensitivity is the product of the magnetic circuit sensitivity (g / a) and the linear ic amplifier gain (mv/g). the linear ic amplifier gain is pro- grammed at the factory to optimize the sensitivity (mv/a) for the full-scale current of the device. noise (v noise ). the product of the linear ic amplifier gain (mv) and the noise floor for the allegro hall effect linear ic. the noise floor is derived from the thermal and shot noise observed in hall elements. dividing the noise (mv) by the sensitivity (mv/a) pro- vides the smallest current that the device is able to resolve. linearity (e lin ). the degree to which the voltage output from the sensor varies in direct proportion to the primary current through its full-scale amplitude. nonlinearity in the output can be attributed to the saturation of the flux concentrator approaching the full-scale current. the following equation is used to derive the linearity: 100 1? [ { [ { v iout _full-scale amperes ? v iout(q) gain % sat ( ) 2 ( v iout _half-scale amperes ? v iout(q) ) where v iout_full-scale amperes = the output voltage (v) when the sensed current approximates full-scale i p . symmetry (e sym ). the degree to which the absolute voltage output from the sensor varies in proportion to either a positive or negative full-scale primary current. the following formula is used to derive symmetry: 100 v iout _+ full-scale amperes ? v iout(q) v iout(q) ? v iout ? full - scale amperes ?? quiescent output voltage (v iout(q) ). the output of the sensor when the primary current is zero. for a unipolar supply voltage, it nominally remains at v cc 2. thus, v cc = 3.3 v translates into v iout(q) = 1.65 v. variation in v iout(q) can be attributed to the resolution of the allegro linear ic quiescent voltage trim and thermal drift. electrical offset voltage (v oe ). the deviation of the device out- put from its ideal quiescent value of v cc / 2 due to nonmagnetic causes. to convert this voltage to amperes, divide by the device sensitivity, sens. accuracy (e tot ). the accuracy represents the maximum devia- tion of the actual output from its ideal value. this is also known as the total ouput error. the accuracy is illustrated graphically in the output voltage versus current chart below. ratiometry . the ratiometric feature means that its 0 a output, v iout(q) , (nominally equal to v cc /2) and sensitivity, sens, are proportional to its supply voltage, v cc . the following formula is used to derive the ratiometric change in 0 a output voltage, ? v iout(q)rat (%): the ratiometric change in sensitivity, ? sens rat (%), is defined as: definitions of accuracy characteristics 100 v iout(q)vcc / v iout(q)3.3v v cc / 3.3 v ?? 100 sens vcc / sens 3.3v v cc / 3.3 v ?? output voltage versus sensed current accuracy at 0 a and at full-scale current increasing v iout (v) +i p (a) accuracy accuracy accuracy 25c only accuracy 25c only accuracy 25c only accuracy 0 a vr oe $ temp erature average v iout ?i p (a) vr oe $ temp erature vr oe $ temp erature decreasing v iout (v) i p (min) i p (max) full scale
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 14 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com definitions of dynamic response characteristics primary current transducer output 90 10 0 i (%) rise time, t r t rise time (t r ). the time interval between a) when the sensor reaches 10% of its full scale value, and b) when it reaches 90% of its full scale value. the rise time to a step response is used to derive the bandwidth of the current sensor, in which ?(?3 db) = 0.35 / t r . both t r and t response are detrimentally affected by eddy current losses observed in the conductive ic ground plane. power-on time (t po ). when the supply is ramped to its operat- ing voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. power-on time, t po , is defined as the time it takes for the output voltage to settle within 10% of its steady state value under an applied magnetic field, after the power supply has reached its minimum specified operating voltage, v cc (min), as shown in the chart at right.
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 15 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com application information layout to optimize thermal and electrical performance, the following features should be included in the printed circuit board: ? the primary leads should be connected to as much copper area as is available. ? the copper should be 2 oz. or heavier. ? additional layers of the board should be used for conducting the primary current if possible, and should be connected using the arrangement of vias shown below. ? the two solder pads at the ends of the exposed pad loop should be placed directly on the copper trace that conducts the primary current. ? when using vias under exposed pads, such as with the ex package, using plugged vias prevents wicking of the solder from the pad into the via during reflow. whether or not to use plugged vias should be evalu- ated in the application. primary current trace via solder pads via under pad signal traces exposed pad loop ex package footprint primary current trace suggested layout. ex package shown.
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 16 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com package lc, 8-pin soic c seating plane 1.27 bsc gauge plane seating plane a terminal #1 mark area b reference land pattern layout (reference ipc7351 soic127p600x175-8m); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances b d c 2 1 8 branding scale and appearance at supplier discretion c seating plane c 0.10 8x 0.25 bsc 1.04 ref 1.75 max for reference only; not for tooling use (reference ms-012aa) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown 4.90 0.10 3.90 0.10 6.00 0.20 0.51 0.31 0.25 0.10 0.25 0.17 1.27 0.40 8 0 n = device part number t = device temperature range p = package designator a = amperage l = lot number belly brand = country of origin nnnnnnn lllll 1 tpp-aaa a standard branding reference view 2 1 8 pcb layout reference view c 0.65 1.27 5.60 1.75 branded face
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 17 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com package ex, 12-contact qfn with fused sensed current loop 0.30 branded face 1.00 1 12 0.50 0.70 0.85 1.27 min 0.80 min 2.90 2.05 ref 2.70 c c seating plane 0.25 +0.05 ?0.07 0.400.10 0.50 bsc 0.75 0.05 3.00 bsc 3.00 bsc d d coplanarity includes exposed current path and terminals b a terminal #1 mark area b fused sensed current path for reference only, not for tooling use (reference jedec mo-220weed except for fused current path) dimensions in millimeters exact case and lead configuration at supplier discretion within limits shown c reference land pattern layout (reference ipc7351 qfn50p300x300x80-17w4m); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances; when mounting on a multilayer pcb, thermal vias at the exposed thermal pad land can improve thermal dissipation (reference eia/jedec standard jesd51-5) 12 0.20 1.79 2 1 a 12 1 2 pcb layout reference view c 0.08 9x branding scale and appearance at supplier discretion e e standard branding reference view n = device part number y = last two digits of year of manufacture w = week of manufacture l = lot number nnnn yyww llll 1
hall effect linear current sensor with overcurrent fault output for < 100 v isolation applications ACS711 18 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com revision history revision revision date description of revision rev. 2 january 4, 2013 update references copyright ?2008-2013, allegro microsystems, llc allegro microsystems, llc reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions a s may be required to permit improvements in the per for mance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegro?s products are not to be used in life support devices or systems, if a failure of an allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. the in for ma tion in clud ed herein is believed to be ac cu rate and reliable. how ev er, allegro microsystems, llc assumes n o re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. for the latest version of this document, visit our website: www.allegromicro.com

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