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acs710 description the allegro ? acs710 current sensor provides economical and precise means for current sensing applications in industrial, commercial, and communications systems. the device is offered in a small footprint surface-mount package that allows easy implementation in customer applications. the acs710 consists of a precision linear hall sensor integrated circuit with a copper conduction path located near the surface of the silicon die. applied current flows through the copper conduction path, and the analog output voltage from the hall sensor linearly tracks the magnetic field generated by the applied current. the accuracy of the acs710 is maximized with this patented packaging configuration because the hall element is situated in extremely close proximity to the current to be measured. high-level immunity to current conductor dv/dt and stray electric fields, offered by allegro proprietary integrated shield technology, results in low ripple on the output and low offset drift in high-side, high-voltage applications. the voltage on the overcurrent input (voc pin) allows customers to define an overcurrent fault threshold for the device. when the current flowing through the copper conduction path (between the ip+ and ipC pins) exceeds this threshold, the open drain overcurrent fault pin will transition to a logic low state. factory programming of the linear hall sensor inside of the acs710 results in exceptional accuracy in both analog and digital output signals. the internal resistance of the copper path used for current sensing is typically 1 m?, for low power loss. also, the current conduction path is electrically isolated from the low-voltage acs710-ds, rev. 10 features and benefits ? industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques ? small footprint package suitable for space-constrained applications ? 1 m primary conductor resistance for low power loss ? high isolation voltage, suitable for line-powered applications ? user-adjustable overcurrent fault level ? overcurrent fault signal typically responds to an overcurrent condition in < 2 s ? integrated shield virtually eliminates capacitive coupling from current conductor to die due to high dv/dt voltage transients ? filter pin capacitor improves resolution in low bandwidth applications ? 3 to 5.5 v single supply operation ? factory-trimmed sensitivity and quiescent output voltage ? chopper stabilization results in extremely stable quiescent output voltage ? ratiometric output from supply voltage 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection continued on the next page package: 16-pin soic hall-effect ic package (suffix la) 1 2 3 4 5 6 7 8 ip+ ip+ ip+ ip+ ip? ip? ip? ip? 16 15 14 13 12 11 10 9 fault_en voc vcc fault viout filter vzcr gnd acs710 0.1 f c oc c f 1 nf v iout fault_en v cc r h r pu r l i p b a r h , r l sets resistor divider reference for v oc c f noise and bandwidth limiting filter capacitor c oc fault delay setting capacitor, 22 nf maximum a use of capacitor required b use of resistor optional, 330 k recommended. if used, resistor must be connected between f a u l t pin and v cc . typical application circuit not to scale cb certifcate number: us-23711-ul
2 sensor inputs and outputs. this allows the acs710 family of sensors to be used in applications requiring electrical isolation, without the use of opto-isolators or other costly isolation techniques. the acs710 is provided in a small, surface-mount soic16 package. 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. applications include: ? motor control and protection ? load management and overcurrent detection ? power conversion and battery monitoring / ups systems description (continued) selection guide part number i p (a) sens (typ) at v cc = 5 v (mv/a) latched fault t a (c) packing 1 acs710klatr-6bb-t 2,3 6 151 yes C40 to 125 tape and reel, 1000 pieces per reel acs710klatr-10bb-t 2 10 85 acs710klatr-12cb-t 2 12.5 56 acs710klatr-25cb-t 2 25 28 acs710klatr-6bb-nl-t 2,3 6 151 no C40 to 125 tape and reel, 1000 pieces per reel acs710klatr-10bb-nl-t 2 10 85 acs710klatr-12cb-nl-t 2 12.5 56 acs710klatr-25cb-nl-t 2 25 28 1 contact allegro for packing options. 2 variant not intended for automotive applications. 3 the formerly offered v cc = 3.3 v version of the i p = 6 a variant (formerly the acs710klatr-6bb-t) is now offered as the acs716klatr-6bb-t. for additional information, please refer to the acs716 datasheet . 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
3 absolute maximum ratings characteristic symbol notes rating unit supply voltage v cc 8 v filter pin v filter 8 v analog output pin v iout 32 v overcurrent input pin v oc 8 v overcurrent f a u l t pin v f a u l t 8 v fault enable (fault_en) pin v faulten 8 v voltage reference output pin v zcr 8 v dc reverse voltage: vcc, filter, viout, voc, f a u l t , fault_en, and vzcr pins v rdcx C0.5 v excess to supply voltage: filter, viout, voc, f a u l t , fault_en, and vzcr pins v ex voltage by which pin voltage can exceed the vcc pin voltage 0.3 v output current source i iout(source) 3 ma output current sink i iout(sink) 1 ma operating ambient temperature t a range k C40 to 125 c junction temperature t j (max) 165 c storage temperature t stg C65 to 170 c thermal characteristics characteristic symbol test conditions value unit package thermal resistance r ja when mounted on allegro demo board with 1332 mm 2 (654 mm 2 on com- ponent side and 678 mm 2 on opposite side) of 2 oz. copper connected to the primary leadframe and with thermal vias connecting the copper layers. performance is based on current flowing through the primary leadframe and includes the power consumed by the pcb. 17 oc/w isolation characteristics characteristic symbol notes rating unit dielectric strength test voltage* v iso agency type-tested for 60 seconds per iec/ul 60950-1 (2nd edition). 3600 v rms agency type-tested for 60 seconds per ul 1577. 3000 v rms working voltage for basic isolation v wvbi maximum approved working voltage for basic (single) isolation according to iec/ul 60950-1 (2nd edition). 870 v pk or vdc 616 v rms clearance d cl minimum distance through air from ip leads to signal leads. 7.5 mm creepage d cr minimum distance along package body from ip leads to signal leads. 7.5 mm *production tested for 1 second at 3600 v rms in accordance with both ul 1577 and iec/ul 60950-1 (edition 2). 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
4 ip? vzcr filter gnd viout drain ip+ fault signal recovery v out(q) trim sensitivity trim r q clk d voc vcc por fault latch oc fault fault reset 3 ma 2v ref por hall bias control logic fault_en + ? + ? fault comparator hall amplifier r f(int) functional block diagram latching version 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ip+ ip+ ip+ ip+ ip? ip? ip? ip? fault_en voc vcc fault viout filter vzcr gnd terminal list table, latching version number name description 1,2,3,4 ip+ sensed current copper conduction path pins. terminals for current being sensed; fused internally, loop to ipC pins; unidirectional or bidirectional current flow. 5,6,7,8 ipC sensed current copper conduction path pins. terminals for current being sensed; fused internally, loop to ip+ pins; unidirectional or bidirectional current flow. 9 gnd device ground connection. 10 vzcr voltage reference output pin. zero current (0 a) reference; output voltage on this pin scales with v cc . (not a highly accurate reference.) 11 filter filter pin. terminal for an external capacitor connected from this pin to gnd to set the device bandwidth. 12 viout analog output pin. output voltage on this pin is proportional to current flowing through the loop between the ip+ pins and ipC pins. 13 f a u l t overcurrent fault pin. when current flowing between ip+ pins and ipC pins exceeds the overcurrent fault threshold, this pin transitions to a logic low state. 14 vcc supply voltage. 15 voc overcurrent input pin. analog input voltage on this pin sets the overcurrent fault threshold. 16 fault_en enables overcurrent faulting when high. resets f a u l t when low. pin-out diagram 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
5 ip? vzcr filter gnd viout drain ip+ fault signal recovery v out(q) trim sensitivity trim voc vcc oc fault fault reset 3 ma 2v ref por hall bias fault_en + ? fault comparator hall amplifier r f(int) functional block diagram non-latching version 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ip+ ip+ ip+ ip+ ip? ip? ip? ip? fault_en voc vcc fault viout filter vzcr gnd terminal list table, non-latching version number name description 1,2,3,4 ip+ sensed current copper conduction path pins. terminals for current being sensed; fused internally, loop to ipC pins; unidirectional or bidirectional current flow. 5,6,7,8 ipC sensed current copper conduction path pins. terminals for current being sensed; fused internally, loop to ip+ pins; unidirectional or bidirectional current flow. 9 gnd device ground connection. 10 vzcr voltage reference output pin. zero current (0 a) reference; output voltage on this pin scales with v cc . (not a highly accurate reference.) 11 filter filter pin. terminal for an external capacitor connected from this pin to gnd to set the device bandwidth. 12 viout analog output pin. output voltage on this pin is proportional to current flowing through the loop between the ip+ pins and ipC pins. 13 f a u l t overcurrent fault pin. when current flowing between ip+ pins and ipC pins exceeds the overcurrent fault threshold, this pin transitions to a logic low state. 14 vcc supply voltage. 15 voc overcurrent input pin. analog input voltage on this pin sets the overcurrent fault threshold. 16 fault_en enables overcurrent faulting when high. pin-out diagram 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
6 common operating characteristics: valid at t a = C40c to 125c, v cc = 5 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units electrical characteristics supply voltage 1 v cc 3 C 5.5 v nominal supply voltage v ccn C 5 C v supply current i cc viout open, f a u l t pin high C 11 14.5 ma output capacitance load c load viout pin to gnd C C 10 nf output resistive load r load viout pin to gnd 10 C C k magnetic coupling from device conductor to hall element mc hall current flowing from ip+ to ipC pins C 9.5 C g/a internal filter resistance 2 r f(int) C 1.7 C k? primary conductor resistance r primary t a = 25c C 1 C m analog output signal characteristics full range linearity 3 e lin i p = i p0a C0.75 0.25 0.75 % symmetry 4 e sym i p = i p0a 99.1 100 100.9 % bidirectional quiescent output v out(qbi) i p = 0 a, t a = 25c C v cc 0.5 C v timing performance characteristics viout signal rise time t r t a = 25c, swing i p from 0 a to i p0a , no capacitor on filter pin, 100 pf from viout to gnd C 3 C s viout signal propagation time t prop t a = 25c, no capacitor on filter pin, 100 pf from viout to gnd C 1 C s viout signal response time t response t a = 25c, swing i p from 0 a to i p0a , no capacitor on filter pin, 100 pf from viout to gnd C 4 C s viout large signal bandwidth f 3db C3 db, apply i p such that v iout = 1 v pk-pk , no capacitor on filter pin, 100 pf from viout to gnd C 120 C khz power-on time t po output reaches 90% of steady-state level, no capacitor on filter pin, t a = 25c C 35 C s overcurrent characteristics setting voltage for overcurrent switchpoint 5 v oc v cc 0.25 C v cc 0.4 v signal noise at overcurrent comparator input i ncomp C 1 C a overcurrent fault switchpoint error 6,7 e oc switchpoint in v oc safe operating area; assumes i ncomp = 0 a C 5 C % overcurrent f a u l t pin output voltage v f a u l t 1 ma sink current at f a u l t pin C C 0.4 v fault enable (fault_en pin) input low voltage threshold v il C C 0.1 v cc v fault enable (fault_en pin) input high voltage threshold v ih 0.8 v cc C C v fault enable (fault_en pin) input resistance r fei C 1 C m? continued on the next page 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
7 common operating characteristics (continued) : valid at t a = C40c to 125c, v cc = 5 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units overcurrent characteristics (continued) fault enable (fault_en pin) delay 8 t fed set fault_en to low, v oc = 0.25 v cc , c oc = 0 f; then run a dc i p exceeding the corresponding overcurrent threshold; then reset fault_en from low to high and measure the delay from the rising edge of fault_en to the falling edge of f a u l t C 15 C s fault enable (fault_en pin) delay (non-latching versions) 9 t fed(nl) set fault_en to low, v oc = 0.25 v cc , c oc = 0 f; then run a dc i p exceeding the corresponding overcurrent threshold; then reset fault_en from low to high and measure the delay from the rising edge of fault_en to the falling edge of f a u l t C 150 C ns overcurrent fault response time t oc fault_en set to high for a minimum of 20 s before the overcurrent event; switchpoint set at v oc = 0.25 v cc ; delay from i p exceeding overcurrent fault threshold to v f a u l t < 0.4 v, without external c oc capacitor C 1.9 C s undercurrent fault response time (non-latching versions) t uc fault_en set to high for a minimum of 20 s before the undercurrent event; switchpoint set at v oc = 0.25 v cc ; delay from i p falling below the overcurrent fault threshold to v f a u l t > 0.8 v cc , without external c oc capacitor, r pu = 330 k C 3 C s overcurrent fault reset delay t ocr time from v faulten < v il to v f a u l t > 0.8 v cc , r pu = 330 k C 500 C ns overcurrent fault reset hold time t och time from v faulten < v il to rising edge of v f a u l t C 250 C ns overcurrent input pin resistance r oc t a = 25c, voc pin to gnd 2 C C m voltage reference characteristics voltage reference output v zcr t a = 25 c (not a highly accurate reference) 0.48 x v cc 0.5 v cc 0.51 x v cc v voltage reference output load current i zcr source current 3 C C ma sink current 50 C C a voltage reference output drift ?v zcr C 10 C mv 1 devices are programmed for maximum accuracy at v cc = 5 v. 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 v cc level at which the device was programmed. customers that plan to operate the device at a v cc level other than the v cc level at which the device was programmed should contact their local allegro sales representative regarding expected device accuracy levels under these bias conditions. 2 r f(int) forms an rc circuit via the filter pin. 3 this parameter can drift by as much as 0.8% over the lifetime of this product. 4 this parameter can drift by as much as 1% over the lifetime of this product. 5 see page 8 on how to set overcurrent fault switchpoint. 6 switchpoint can be lower at the expense of switchpoint accuracy. 7 this error specification does not include the effect of noise. see the i ncomp specification in order to factor in the additional influence of noise on the fault switchpoint. 8 fault enable delay is designed to avoid false tripping of an overcurrent (oc) fault at power-up. a 15 s (typical) delay will always be needed, every time fault_en is raised from low to high, before the device is ready for responding to any overcurrent event. 9 during power-up, this delay is 15 s in order to avoid false tripping of an overcurrent (oc) fault. 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
8 performance characteristics : t a range k, valid at t a = C?40c to 125c, v cc = 5 v, unless otherwise specified characteristic symbol test conditions min. typ. max. units x6bb characteristics optimized accuracy range 1 i poa C7.5 C 7.5 a linear sensing range i r C14 C 14 a noise 2 v noise(rms) t a = 25c, sens = 100 mv/a, c f = 0, c load = 4.7 nf, r load open C 4.05 C mv sensitivity 3 sens i p = 6.5 a, t a = 25c C 151 C mv/a i p = 6.5 a, t a = 25c to 125c C 151 C mv/a i p = 6.5 a, t a = C?40c to 25c C 152 C mv/a electrical offset voltage variation relative to v out(qbi) 4 v oe i p = 0 a, t a = 25c C 10 C mv i p = 0 a, t a = 25c to 125c C 11 C mv i p = 0 a, t a = C?40c to 25c C 40 C mv total output error 5 e tot over full scale of i poa ?, i p applied for 5 ms, t a = 25c to 125c C 1.6 C % over full scale of i poa ?, i p applied for 5 ms, t a = C?40c to 25c C 5.6 C % x10bb characteristics optimized accuracy range 1 i poa C10 C 10 a linear sensing range i r C24 C 24 a noise 2 v noise(rms) t a = 25c, sens = 85 mv/a, c f = 0, c load = 4.7 nf, r load open C 2.3 C mv sensitivity 3 sens i p = 10 a, t a = 25c C 85 C mv/a i p = 10 a, t a = 25c to 125c C 85 C mv/a i p = 10 a, t a = C?40c to 25c C 85 C mv/a electrical offset voltage variation relative to v out(qbi) 4 v oe i p = 0 a, t a = 25c C 5 C mv i p = 0 a, t a = 25c to 125c C 12 C mv i p = 0 a, t a = C?40c to 25c C 22 C mv total output error 5 e tot over full scale of i poa ?, i p applied for 5 ms, t a = 25c to 125c C 1.8 C % over full scale of i poa ?, i p applied for 5 ms, t a = C?40c to 25c C 5 C % continued on the next page x12cb characteristics optimized accuracy range 1 i poa C12.5 C 12.5 a linear sensing range i r C37.5 C 37.5 a noise 2 v noise(rms) t a = 25c, sens = 56 mv/a, c f = 0, c load = 4.7 nf, r load open C 1.50 C mv sensitivity 3 sens i p = 12.5 a, t a = 25c C 56 C mv/a i p = 12.5 a, t a = 25c to 125c C 56 C mv/a i p = 12.5 a, t a = C?40c to 25c C 57 C mv/a electrical offset voltage variation relative to v out(qbi) 4 v oe i p = 0 a, t a = 25c C 4 C mv i p = 0 a, t a = 25c to 125c C 14 C mv i p = 0 a, t a = C?40c to 25c C 23 C mv total output error 5 e tot over full scale of i poa ?, i p applied for 5 ms, t a = 25c to 125c C 2.2 C % over full scale of i poa ?, i p applied for 5 ms, t a = C?40c to 25c C 3.9 C % 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
9 x25cb characteristics optimized accuracy range 1 i poa C25 C 25 a linear sensing range i r C75 C 75 a noise 2 v noise(rms) t a = 25c, sens = 28 mv/a, c f = 0, c load = 4.7 nf, r load open C 1 C mv sensitivity 3 sens i p = 25 a, t a = 25c C 28 C mv/a i p = 25 a, t a = 25c to 125c C 27.9 C mv/a i p = 25 a, t a = C?40c to 25c C 28.5 C mv/a electrical offset voltage variation relative to v out(qbi) 4 v oe i p = 0 a, t a = 25c C 3 C mv i p = 0 a, t a = 25c to 125c C 12 C mv i p = 0 a, t a = C?40c to 25c C 18 C mv total output error 5 e tot over full scale of i p ? oa , i p applied for 5 ms, t a = 25c to 125c C 2.9 C % over full scale of i p ? oa , i p applied for 5 ms, t a = C?40c to 25c C 5.2 C % 1 although the device is accurate over the entire linear range, the device is programmed for maximum accuracy over the range defined by i poa . the reason for this is that in many applications, such as motor control, the start-up current of the motor is approximately three times higher than the running current. 2 v pk-pk noise (6 sigma noise) is equal to 6 v noise(rms) . lower noise levels than this can be achieved by using c f for applications requiring narrower bandwidth. see characteristic performance page for graphs of noise versus c f and bandwidth versus c f . 3 this parameter can drift by as much as 2.4% over the lifetime of this product. 4 this parameter can drift by as much as 13 mv over the lifetime of this product. 5 this parameter can drift by as much as 2.5% over the lifetime of this product. performance characteristics (continued) : t a range k, valid at t a = C?40c to 125c, v cc = 5 v, unless otherwise specified 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
10 acs710 bandwidth versus external capacitor value, c f capacitor connected between filter pin and gnd 1000 100 10 1 0.1 0.01 0.1 1 10 100 1000 bandwidth (khz) capacitance (nf) characteristic performance acs710x-2 5 c v cc = 5 v acs710x-2 5 c v cc = 3.3 v acs710x-12c v cc = 5 v acs710x-12c v cc = 3.3 v capacitance (nf) capacitance (nf) capacitance (nf) capacitance (nf) r m s n o i s e (v) r m s n o i s e (v) r m s n o i s e (v) r m s n o i s e (v) 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0 0 1 0 2 0 3 0 4 0 5 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 0 1 0 2 0 3 0 4 0 5 0 0 2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 1 2 0 0 1 4 0 0 1 6 0 0 0 1 0 2 0 3 0 4 0 5 0 0 2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 1 2 0 0 1 4 0 0 1 6 0 0 0 1 0 2 0 3 0 4 0 5 0 acs710 noise versus external capacitor value, c f capacitor connected between filter pin and gnd 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
11 characteristic performance data data taken using the acs710-6bb accuracy data me a n typical maximum limit typical minimum limit 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 160.0 157.5 155.0 152.5 150.0 147.5 145.0 142.5 140.0 101.00 100.75 100.50 100.25 100.00 99.75 99.50 99.25 99.00 6.0 4.5 3.0 1.5 0 -1.5 -3.0 -4.5 -6.0 v oe (mv) e lin (%) sens (mv/a) e sym (%) e tot (%) t a ( c) t a ( c) t a ( c) t a ( c) t a ( c) ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 50 40 30 20 10 0 -10 -20 -30 -40 -50 electrical offset voltage versus ambient temperature nonlinearity versus ambient temperature sensitivity versus ambient temperature total output error versus ambient temperature symmetry versus ambient temperature 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
12 characteristic performance data data taken using the acs710-10bb accuracy data me a n typical maximum limit typical minimum limit 0.30 0.20 0.10 0 -0.10 -0.20 -0.30 -0.40 -0.50 88.00 87.00 86.00 85.00 84.00 83.00 82.00 81.00 100.30 100.20 100.10 100.00 99.90 99.80 99.70 99.60 99.50 99.40 v oe (mv) e lin (%) sens (mv/a) e sym (%) t a ( c) t a ( c) t a ( c) t a ( c) ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 4.00 3.00 2.00 1.00 0 -1.00 -2.00 -3.00 -4.00 -5.00 e tot (%) t a ( c) ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 30 20 10 0 -10 -20 -30 electrical offset voltage versus ambient temperature nonlinearity versus ambient temperature sensitivity versus ambient temperature symmetry versus ambient temperature total output error versus ambient temperature 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
13 characteristic performance data data taken using the acs710-12cb accuracy data me a n typical maximum limit typical minimum limit 25 20 15 10 5 0 -5 -10 -15 -20 -25 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.25 -0.30 -0.35 -0.40 -0.45 58.5 58.0 57.5 57.0 56.5 56.0 55.5 55.0 100.1 100.0 99.9 99.8 99.7 99.6 99.5 6 5 4 3 2 1 0 -1 -2 -3 v oe (mv) e lin (%) sens (mv/a) e sym (%) e tot (%) t a ( c) t a ( c) t a ( c) t a ( c) t a ( c) ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 electrical offset voltage versus ambient temperature nonlinearity versus ambient temperature sensitivity versus ambient temperature total output error versus ambient temperature symmetry versus ambient temperature 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
14 characteristic performance data data taken using the acs710-25cb accuracy data me a n typical maximum limit typical minimum limit 25 20 15 10 5 0 -5 -10 -15 -20 -25 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.25 -0.30 -0.35 29.6 29.4 29.2 29.0 28.8 28.6 28.4 28.2 28.0 27.8 27.6 100.1 100.0 99.9 99.8 99.7 99.6 99.5 6 5 4 3 2 1 0 -1 -2 -3 v oe (mv) e lin (%) sens (mv/a) e sym (%) e tot (%) t a ( c) t a ( c) t a ( c) t a ( c) t a ( c) ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 ?50 100 125 150 50 0 -25 25 75 electrical offset voltage versus ambient temperature nonlinearity versus ambient temperature sensitivity versus ambient temperature total output error versus ambient temperature symmetry versus ambient temperature 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
15 setting 12cb and 25cb versions the v oc needed for setting the overcurrent fault switchpoint can be calculated as follows: v oc = sens | i oc | , where v oc is in mv, sens in mv/a, and i oc (overcurrent fault switchpoint) in a. setting overcurrent fault switchpoint i oc v oc 0. 4 v cc ? 0 . 2 5 v cc / se ns ? 0 . 4 v cc / se ns 0 0 . 2 5 v cc / se ns 0 . 4 v cc / se ns not valid range valid range 0. 2 5 v cc i oc versus v oc (12cb and 25cb versions) example: for acs710klatr-25cb-t, if required overcurrent fault switchpoint is 50 a, and v cc = 5 v, then the required v oc can be calculated as follows: v oc = sens i oc = 28 50 = 1400 (mv) | ioc | is the overcurrent fault switchpoint for a bidirectional (ac) current, which means a bidirectional sensor will have two sym - metrical overcurrent fault switchpoints, +i oc and Ci oc . see the following graph for i oc and v oc ranges. 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
16 setting 6bb and 10bb versions the v oc needed for setting the overcurrent fault switchpoint can be calculated as follows: v oc = 1.17 sens | i oc | , where v oc is in mv, sens in mv/a, and i oc (overcurrent fault switchpoint) in a. i oc v oc 0. 4 v cc ? 0 . 2 5 v cc / (1.17 se ns) ? 0 . 4 v cc / (1.17 se ns) 0 0 . 2 5 v cc / (1.17 se ns) 0 . 4 v cc / (1.17 se ns) not valid range valid range 0. 2 5 v cc i oc versus v oc (6bb and 10bb versions) example: for acs710klatr-6bb-t, if required overcurrent fault switchpoint is 10 a, and v cc = 5 v, then the required v oc can be calculated as follows: v oc = 1.17 sens i oc = 1.17 151 10 = 1767 (mv) | ioc | is the overcurrent fault switchpoint for a bidirectional (ac) current, which means a bidirectional sensor will have two sym - metrical overcurrent fault switchpoints, +i oc and Ci oc . see the following graph for i oc and v oc ranges. 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
17 overcurrent fault operation the primary concern with high-speed fault detection is that noise may cause false tripping. various applications have or need to be able to ignore certain faults that are due to switching noise or other parasitic phenomena, which are application dependant. the problem with simply trying to filter out this noise in the main signal path is that in high-speed applications, with asymmetric noise, the act of filtering introduces an error into the measure - ment. to get around this issue, and allow the user to prevent the fault signal from being latched by noise, a circuit was designed to slew the f a u l t pin voltage based on the value of the capacitor from that pin to ground. once the voltage on the pin falls below 2 v, as established by an internal reference, the fault output is latched and pulled to ground quickly with an internal n-channel mosfet. fault walkthrough the following walkthrough references various sections and attributes in the figure below. this figure shows different fault set/reset scenarios and how they relate to the voltages on the f a u l t pin, fault_en pin, and the internal overcurrent (oc) fault node, which is invisible to the customer. 1. because the device is enabled (fault_en is high for a minimum period of time, the fault enable delay, t fed , 15 s typical) and there is an oc fault condition, the device f a u l t pin starts discharging. 2. when the f a u l t pin voltage reaches approximately 2 v, the fault is latched, and an internal nmos device pulls the f a u l t pin voltage to approximately 0 v. the rate at which the f a u l t pin slews downward (see [4] in the figure) is dependent on the external capacitor, c oc , on the f a u l t pin. 3. when the fault_en pin is brought low, the f a u l t pin starts resetting if no oc fault condition exists, and if fault_en is low for a time period greater than t och . the internal nmos pull-down turns off and an internal pmos pull- up turns on (see [7] if the oc fault condition still exists). 4. the slope, and thus the delay to latch the fault is controlled by the capacitor, c oc , placed on the f a u l t pin to ground. dur - ing this portion of the fault (when the f a u l t pin is between v cc and 2 v), there is a 3 ma constant current sink, which discharges c oc . the length of the fault delay, t, is equal to : c oc ( v cc ? 2 v ) 3 ma t = (1) where v cc is the device power supply voltage in volts, t is in seconds and c oc is in farads. this formula is valid for r pu equal to or greater than 330 k. for lower-value resistors, the current flowing through the r pu resistor during a fault event, i pu , will be larger. therefore, the current discharging the capacitor would be 3 ma C i pu and equation 1 may not be valid. 5. the f a u l t pin did not reach the 2 v latch point before the oc fault condition cleared. because of this, the fixed 3 ma current sink turns off, and the internal pmos pull-up turns on to recharge c oc through the f a u l t pin. 6. this curve shows v cc charging external capacitor c oc through the internal pmos pull-up. the slope is determined by c oc . 7. when the fault_en pin is brought low, if the fault condition still exists, the latched f a u l t pin will be pulled low by the internal 3ma current source. when fault condition is removed then the fault pin charges as shown in step 6. 8. at this point there is a fault condition, and the part is enabled before the f a u l t pin can charge to v cc . this shortens the user-set delay, so the fault is latched earlier. the new delay time can be calculated by equation 1, after substituting the voltage seen on the f a u l t pin for v cc . functional description (latching versions) v cc 2 v 0 v time t fed fault (output) fault_en (input) oc fault condition (active high) 2 3 6 6 6 8 1 1 1 4 2 7 4 2 4 4 5 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
18 overcurrent fault operation the primary concern with high-speed fault detection is that noise may cause false tripping. various applications have or need to be able to ignore certain faults that are due to switching noise or other parasitic phenomena, which are application dependant. the problem with simply trying to filter out this noise in the main sig - nal path is that in high-speed applications, with asymmetric noise, the act of filtering introduces an error into the measurement. to get around this issue, and allow the user to prevent the fault signal from going low due to noise, a circuit was designed to slew the f a u l t pin voltage based on the value of the capacitor from that pin to ground. once the voltage on the pin falls below 2 v, as established by an internal reference, the fault output is pulled to ground quickly with an internal n-channel mosfet. fault walkthrough the following walkthrough references various sections and attributes in the figure below. this figure shows different fault set/reset scenarios and how they relate to the voltages on the f a u l t pin, fault_en pin, and the internal overcurrent (oc) fault node, which is invisible to the customer. 1. because the device is enabled (fault_en is high for a mini - mum period of time, the fault enable delay, t fed , and there is an oc fault condition, the device f a u l t pin starts discharging. 2. when the f a u l t pin voltage reaches approximately 2 v, an internal nmos device pulls the f a u l t pin voltage to approx - imately 0 v. the rate at which the f a u l t pin slews downward (see [4] in the figure) is dependent on the external capacitor, c oc , on the f a u l t pin. 3. when the fault_en pin is brought low, the f a u l t pin starts resetting if fault_en is low for a time period greater than t och . the internal nmos pull-down turns off and an internal pmos pull-up turns on. 4. the slope, and thus the delay to pull the fault low is controlled by the capacitor, c oc , placed on the f a u l t pin to ground. during this portion of the fault (when the f a u l t pin is between v cc and 2 v), there is a 3 ma constant current sink, which discharges c oc . the length of the fault delay, t, is equal to: c oc ( v cc ? 2 v ) 3 ma t = (2) where v cc is the device power supply voltage in volts, t is in seconds and c oc is in farads. this formula is valid for r pu equal to or greater than 330 k. for lower-value resistors, the current flowing through the r pu resistor during a fault event, i pu , will be larger. therefore, the current discharging the capacitor would be 3 ma C i pu and equation 1 may not be valid. 5. the f a u l t pin did not reach the 2 v latch point before the oc fault condition cleared. because of this, the fixed 3 ma current sink turns off, and the internal pmos pull-up turns on to recharge c oc through the f a u l t pin. 6. this curve shows v cc charging external capacitor c oc through the internal pmos pull-up. the slope is determined by c oc . 7. at this point there is a fault condition, and the part is enabled before the f a u l t pin can charge to v cc . this shortens the user-set delay, so the fault gets pulled low earlier. the new delay time can be calculated by equation 1, after substituting the voltage seen on the f a u l t pin for v cc . functional description (non-latching versions) v cc 2 v 0 v time t fed fault (output) fault_en (input) oc fault condition (active high) 2 3 6 6 6 7 1 1 1 4 2 4 2 4 4 5 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
19 chopper stabilization is an innovative circuit technique that is used to minimize the offset voltage of a hall element and an asso - ciated on-chip amplifier. allegro patented a chopper stabilization technique that nearly eliminates hall ic output drift induced by temperature or package stress effects. this offset reduction technique is based on a signal modulation-demodulation process. modulation is used to separate the undesired dc offset signal from the magnetically induced signal in the frequency domain. then, using a low-pass filter, the modulated dc offset is sup - pressed while the magnetically induced signal passes through the filter. as a result of this chopper stabilization approach, the am p r egu l a to r clock/lo gic ha ll e l e m e n t sa mp le an d ho ld lo w-p a ss filte r concept of chopper stabilization technique chopper stabilization technique output voltage from the hall ic is desensitized to the effects of temperature and mechanical stress. this technique produces devices that have an extremely stable electrical offset voltage, are immune to thermal stress, and have precise recoverability after temperature cycling. this technique is made possible through the use of a bicmos process that allows the use of low-offset and low-noise amplifiers in combination with high-density logic integration and sample- and-hold circuits. 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
20 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. the noise floor is derived from the thermal and shot noise observed in hall elements. dividing the noise (mv) by the sensi - tivity (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 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: 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 0.5 v cc . for example, in the case of a bidirectional output device, v cc = 5 v translates into v iout(q) = 2.5 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 voltage due to nonmagnetic causes. to convert this voltage to amperes, divide by the device sensitiv - ity, 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 at right. note that error is directly measured during final test at allegro. 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. 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 r at (%), is defined as: definitions of accuracy characteristics 100 1? [ { [ { v iout _full-scale amperes ? v iout(q) 2 (v iout _1/2 full-scale amperes ? v iout(q) ) 100 v iout _+ full-scale amperes ? v iout(q) v iout(q) ? v iout _?full-scale amperes 100 v iout(q)vcc / v iout(q)5v v cc / 5 v 100 sens vcc / sens 5v v cc / 5 v output voltage versus sensed current accuracy at 0 a and at full-scale current increasing v iout (v) +i p (a) ac curacy ac curacy acc u racy 25 c o n ly acc u racy 25 c o n ly a ccuracy 25 c on ly a ccuracy 0 a v r o e ? temp erature averag e v iout ?i p (a) v r o e ? temp erature v r o e ? temp erature decreasing v iout (v) i p (min) i p (max) full scale 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
21 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 ?(C3 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. 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
22 package la, 16-pin soicw 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 pcb layout reference view b c c 2 1 16 branding scale and appearance at supplier discretion c seating plane c 0.10 16x 0.25 bsc 1.40 ref 2.65 max for reference only; not for tooling use (reference ms-013aa) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown 10.30 0.20 7.50 0.10 10.30 0.33 0.51 0.31 0.30 0.10 0.33 0.20 1.27 0.40 8 0 n = device part number t = temperature range, package - amperage l = lot number nnnnnnnnnnn lllllllll 1 ttt-ttt a standard branding reference view 2 1 16 0.65 1.27 9.50 2.25 branded face 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
23 for the latest version of this document, visit our website: www.allegromicro.com copyright ?2007-2015, allegro microsystems, llc the products described herein are protected by u.s. patents: 7,166,807; 7,425,821; 7,573,393; and 7,598,601. allegro microsystems, llc reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegros 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 information included herein is believed to be accurate and reliable. however, allegro microsystems, llc assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. revision history revision revision date description of revision 9 june 17, 2013 add 10bb variant 10 august 19, 2015 added certificate number under ul stamp on page 1; updated isolation characteristics table. 120 khz bandwidth, high-voltage isolation current sensor with integrated overcurrent detection acs710 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com

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