acs754xcb-050 description the allegro acs75x family of current sensors provides economical and precise solutions for current sensing in industrial, automotive, commercial, and communications systems. the device package allows for easy implementation by the customer. typical applications include motor control, load detection and management, power supplies, and overcurrent fault protection. the device consists of a precision, low-offset linear hall sensor circuit with a copper conduction path located near 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. a precise, proportional voltage is provided by the low-offset, chopper-stabilized bicmos hall ic, which is programmed for accuracy at the factory. the output of the device has a positive slope (>v cc / 2) when an increasing current flows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sensing. the internal resistance of this conductive path is typically 100 ? , providing low power loss. the thickness of the copper conductor allows survival of the device at up to acs75450-ds rev. 7 features and benefits ? monolithic hall ic for high reliability ? single +5 v supply ? 3 kv rms isolation voltage between terminals 4/5 and pins 1/2/3 for up to 1 minute ? 35 khz bandwidth ? automotive temperature range ? end-of-line factory-trimmed for gain and offset ? ultra-low power loss: 100 ? internal conductor resistance ? ratiometric output from supply voltage ? extremely stable output offset voltage ? small package size, with easy mounting capability ? output proportional to ac and dc currents fully integrated, hall effect-based linear current sensor with high voltage isolation and a low-resistance current conductor continued on the next page? package: 5 pin module (leadform pff) typical application +5 v v ou t r f c f c byp 0.1 f ip+ ip? 2 gnd 4 5 acs754 3 1 viout vcc i p application 1. the acs754 outputs an analog signal, v out . that varies linearly with the uni- or bi-directional ac or dc primary sensed current, i p , within the range specified. c f is recommended for noise management, with values that depend on the application.
fully integrated, hall effect-based linear current sensor with high voltage isolation and a low-resistance current conductor acs754xcb-050 2 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com 5 overcurrent conditions. the terminals of the conductive path are electrically isolated from the sensor leads (pins 1 through 3). this allows the acs75x family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. the device is fully calibrated prior to shipment from the factory. the acs75x family is lead (pb) free. all pins are coated with 100% matte tin, and there is no lead inside the package. the heavy gauge leadframe is made of oxygen-free copper. description (continued) selection guide part number t op (c) primary sensed current, i p (a) sensitivity sens (typ.) (mv/a) package packing 1 terminals signal pins acs754lcb-050-pff ?40 to 150 50 40 formed formed bulk, 170 pieces/bag ACS754SCB-050-PFF 2 ?20 to 85 50 40 formed formed 1 contact allegro for additional packing options. 2 variant is in production but has been determined to be last time buy. this classification indicates that the variant is obsolet e and notice has been given. sale of the variant is currently restricted to existing customer applications. the variant should not be purchased for n ew design applications because of obsolescence in the near future. samples are no longer available. status date change november 1, 2008. deadline for receipt of last time buy orders is may 1, 2008. absolute maximum ratings characteristic symbol notes rating units supply voltage v cc 16 v reverse supply voltage v rcc ?16 v output voltage v iout 16 v reverse output voltage v riout ?0.1 v maximum basic isolation voltage v iso 353 vac, 500 vdc, or v pk v maximum rated input current i in 200 a output current source i out(source) 3ma output current sink i out(sink) 10 ma nominal operating ambient temperature t a range l ?40 to 150 oc range s ?20 to 85 oc maximum junction t j (max) 165 oc storage temperature t stg ?65 to 170 oc tv america certificate number: u8v 04 11 54214 001 fire and electric shock en60950-1:2001
fully integrated, hall effect-based linear current sensor with high voltage isolation and a low-resistance current conductor acs754xcb-050 3 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com ip+ ip? viout gnd vcc 4 5 3 2 1 terminal list table number name description 1 vcc device power supply pin 2 gnd signal ground pin 3 viout analog output signal pin 4 ip+ terminal for current being sensed 5 ip? terminal for current being sensed functional block diagram pin-out diagram amp out vcc +5 v viout gnd filter dynamic offset cancellation 0.1 f ip? ip+ gain temperature coefficient offset voltage regulator trim control to all subcircuits
fully integrated, hall effect-based linear current sensor with high voltage isolation and a low-resistance current conductor acs754xcb-050 4 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com characteristic symbol test conditions min. typ. max. units primary sensed current i p ?50 ? 50 a supply voltage v cc 4.5 5.0 5.5 v supply current i cc v cc = 5.0 v, output open 6.5 8 10 ma output resistance r out i out = 1.2 ma ? 1 2 output capacitance load c load vout to gnd ? ? 10 nf output resistive load r load vout to gnd 4.7 ? ? k primary conductor resistance r primary i p = 100a; t a = 25c ? 100 ? ? pins 1-3 and 4-5; 60 hz, 1 minute 3.0 ? ? kv performance characteristics, -20c to +85c , v cc = 5 v unless otherwise specified propagation time t prop i p = 50 a, t a = 25c ? 4 ? s response time t response i p = 50 a, t a = 25c ? 12 ? s rise time t r i p = 50 a, t a = 25c ? 11 ? s frequency bandwidth f ?3 db , t a = 25c ? 35 ? khz sensitivity sens over full range of i p , t a = 25c ? 40 ? mv/a over full range of i p 37.8 ? 42.0 mv/a noise v noise peak-to-peak, t a = 25c, no external filter ?65 ?mv linearity e lin over full range of i p ? ? 1.5 % symmetry e sym over full range of i p 98 100 102 % zero current output voltage v out(q) i = 0 a, t a = 25c ? v cc / 2 ? v electrical offset voltage (magnetic error not included) v oe i = 0 a, t a = 25c ?10 ? 10 mv i = 0 a ?20 ? 20 mv magnetic offset error i errom i = 0 a, after excursion of 100 a ? 0.1 0.40 a total output error (including all offsets) e tot over full range of i p , t a = 25c ? 1.0 ? % over full range of i p ? ? 5.0 % performance characteristics, -40c to +150c , v cc = 5 v unless otherwise specified propagation time t prop i p = 50 a, t a = 25c ? 4 ? s response time t response i p = 50 a, t a = 25c ? 12 ? s rise time t r i p = 50 a, t a = 25c ? 11 ? s frequency bandwidth f ?3 db , t a = 25c ? 35 ? khz sensitivity sens over full range of i p , t a = 25c ? 40 ? mv/a over full range of i p 36.0 ? 42.8 mv/a noise v noise peak-to-peak, t a = 25c, no external filter ?65 ?mv linearity e lin over full range of i p ? ? 1.8 % symmetry e sym over full range of i p 98 100 102 % zero current output voltage v out(q) i = 0 a, t a = 25c ? v cc / 2 ? v electrical offset voltage (magnetic error not included) v oe i = 0 a, t a = 25c ?10 ? 10 mv i = 0 a ?35 ? 35 mv magnetic offset error i errom i = 0 a, after excursion of 100 a ? 0.1 0.40 a total output error (including all offsets) e tot over full range of i p , t a = 25c ? 1.0 ? % over full range of i p ? ? 9.9 % electrical characteristics, over operating ambient temperature range unless otherwise stated
fully integrated, hall effect-based linear current sensor with high voltage isolation and a low-resistance current conductor acs754xcb-050 5 allegro microsystems, inc. 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/g) and the noise floor for the allegro hall effect linear ic ( 1 g). the noise floor is derived from the thermal and shot noise observed in hall elements. dividing the noise (mv) by the sensitivity (mv/a) provides 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: where ? gain = the gain variation as a function of temperature changes from 25oc, % sat = the percentage of saturation of the flux concentra- tor, which becomes significant as the current being sensed approaches full-scale i p , and 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 equation is used to derive symmetry: 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 = 5 v translates into v iout(q) = 2.5 v. variation in v out(q) can be attributed to the res- olution of the allegro linear ic quiescent voltage trim, magnetic hysteresis, 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. magnetic offset error (i errom ). the magnetic offset is due to the residual magnetism (remnant field) of the core material. the magnetic offset error is highest when the magnetic circuit has been saturated, usually when the device has been subjected to a full-scale or high-current overload condition. the magnetic offset is largely dependent on the material used as a flux concentrator. the larger magnetic offsets are observed at the lower operating temperatures. 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 on the following page. accuracy is divided into four areas: ?? 0 a at 25c. accuracy of sensing zero current flow at 25c, without the effects of temperature. ?? 0 a over temperature. accuracy of sensing zero current flow including temperature effects. ?? full-scale current at 25c. accuracy of sensing the full-scale current at 25c, without the effects of temperature. ?? full-scale current over temperature. accuracy of sensing full- scale current flow including temperature effects. definitions of accuracy characteristics 100 1? [ { [ { v iout _full-scale amperes ? v iout(q) gain % sat ( ) 2 ( v iout _half-scale amperes ? v iout(q) ) 100 v iout _+ full-scale amperes ? v iout(q) v iout(q) ? v iout _?full-scale amperes ??
fully integrated, hall effect-based linear current sensor with high voltage isolation and a low-resistance current conductor acs754xcb-050 6 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com definitions of dynamic response characteristics propagation delay (t prop ). the time required for the sensor output to reflect a change in the primary current signal. propaga- tion delay is attributed to inductive loading within the linear ic package, as well as in the inductive loop formed by the primary conductor geometry. propagation delay can be considered as a fixed time offset and may be compensated. primary current transducer output 90 0 i (%) propagation time, t prop t primary current transducer output 90 0 i (%) response time, t response t 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. response time (t response ). the time interval between a) when the primary current signal reaches 90% of its final value, and b) when the sensor reaches 90% of its output corresponding to the applied current. 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
fully integrated, hall effect-based linear current sensor with high voltage isolation and a low-resistance current conductor acs754xcb-050 7 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com step response no external filter, t a =25c x050 device output (mv) 50 a excitation signal
fully integrated, hall effect-based linear current sensor with high voltage isolation and a low-resistance current conductor acs754xcb-050 8 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com package cb, 5-pin module leadform pff creepage distance, current terminals to sensor pins: 7.25 mm clearance distance, current terminals to sensor pins: 7.25 mm package mass: 4.63 g typical copyright ?2004-2008, allegro microsystems, inc. the products described herein are manufactured under one or more of the following u.s. patents: 5,045,920; 5,264,783; 5,442,283 ; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. allegro microsystems, inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to per- mit 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, inc. assumes no 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 4 r1 1.91 3 21.4 0.5 r3 ? 0.8 ? 1.5 ? 0.5 r2 perimeter through-holes recommended 1o2 5o5 b 23 14.00.2 17.50.2 4.00.2 3.00.2 2.90.2 3.50.2 3.50.2 10.000.10 13.000.10 0.510.10 4.400.10 7.000.10 1.90.2 1.500.10 1 4 5 a a c b c b branding scale and appearance at supplier discretion dambar removal intrusion for reference only; not for tooling use (reference dwg-9111, dwg-9110) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown standard branding reference view n = device part number t = temperature code a = amperage range l = lot number y = last two digits of year of manufacture w = week of manufacture = supplier emblem branded face 0.381 +0.060 ?0.030 1 nnnnnnn ttt - aaa lllllll yyww pcb layout reference view
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