issue 2 - may 2007 1 www.zetex.com ? zetex semiconductors plc 2007 zxct1030 high-side current monitor with comparator description typical application circuit ordering information the zxct1030 is a high side current sense monitor containing an internal reference and comparator with a non-latching output. using this device eliminates the need to disrupt the ground plane when sensing a load current. the wide input voltage range of 20v down to as low as 2.2v make it suitable for a range of applications. dynamics and supply current are optimized for the processing of fast pulses, associated with switch mode applications. features ? low cost, accurate high-side current sensing ? output voltage scaling ? up to 18v output ? 2.2v - 20v supply range ?270 a quiescent current ? 1.5% typical accuracy ? so8 package ? voltage reference on chip ? comparator on chip applications ? battery chargers ? electronic fuse ?dc motor control ? over current monitor ? power management ? inrush current limiting device status package device marking reel size (inches) tape width (mm) quantity per reel zxct1030x8ta last time buy msop8 zxct1030 7 12 1000 zxct1030n8ta preview so8 zxct1030 7 12 500
zxct1030 issue 2 - may 2007 2 www.zetex.com ? zetex semiconductors plc 2007 absolute maximum ratings recommended opera ting conditions pin-out connections voltage on any pin -0.6v and v cc +0.6v operating temperature -40 to 85c storage temperature -55 to 125c package power dissipation (t amb = 25c) msop8 500mw parameter min. max. unit v cc 2.2 20 v v sense+ 2.2 v cc v v sense (a) 10 500 mv v out 0v sense -1v v v comp-in 0.005 10 v t amb -40 85 c pin name function v cc supply voltage v sense- negative sense input v sense+ positive sense input gnd ground v comp_in comparator input, usually a ratio of the reference or other control signal vref_out reference output v out current monitor output voltage v comp_out open collector comparator output v cc v sense- v sense+ gnd v comp_out v out vref_out v comp_in
zxct1030 issue 2 - may 2007 3 www.zetex.com ? zetex semiconductors plc 2007 electrical characteristics (zxct1030x8) - test conditions t amb = 25c, v in = v cc = 15v, r comp = 10kv, v comp_supply = 5v unless otherwise stated. notes: (a) v sense = (v sense+ ) - (v sense -) (b) level of v sense+ where comparator output defaults to 'off'. symbol parameter conditions limits unit min. typ. max. v cc v cc range 2.2 20 v v sense+ sense+ range 2.2 v cc v out output voltage v sense = 0v 0 2 10 mv v sense = 10mv 88 100 112 mv v sense = 30mv 284 300 316 mv v sense = 50mv 480 500 520 mv v sense = 100mv 970 1000 1030 mv v sense = 500mv 4500 5000 5500 mv r out output resistance v sense- = 15v, v out = 1v 1.2 1.5 1.8 k v out v out 30 ppm/c t c temperature coefficient i cc supply current v sense- = 15v 170 270 350 a i sense+ v sense+ input current 48 90 a i sense- v sense- input current v sense- = 14.9v 70 220 na v cm(min) (b) minimum active common mode voltage v cc =15v 2.8 v v comp_supply = 5v v comp_in = v ref v sense = 10mv a cc accuracy v sense =100mv -3 3 % gain v out /v sense v sense = 100mv 9.7 10.0 10.3 bw bandwidth v sense =10mvp-p 3 mhz v sense = 100mvp-p 6 mhz comparator v comp_in input voltage 0.005 10 v v h hysteresis 15 mv i b input bias 5 80 150 na t d propagation delay 100 ns v ol output voltage low 30 150 200 mv v oh output voltage high v comp_ supply v i ol output sink current v ol = 0.4v 2 ma i oh output high leakage current 1.0 a voltage reference v ref reference current = +300 a to -5 a 1.200 1.240 1.280 v delta v ref change in v ref isource 5 a to isink 300 a 10 mv t c 30 ppm/c psr supply rejection 0.01 %/v
zxct1030 issue 2 - may 2007 4 www.zetex.com ? zetex semiconductors plc 2007 electrical characteristics (zxct1030n8) - test conditions t amb = 25c, v in = v cc = 15v, r comp = 10kv, v comp_supply = 5v unless otherwise stated. notes: (c) v sense = (v sense+ ) - (v sense -) (d) level of v sense+ where comparator output defaults to 'off'. symbol parameter conditions limits unit min. typ. max. v cc v cc range 2.2 20 v v sense+ sense+ range 2.2 v cc v out output voltage v sense = 0v 0 2 10 mv v sense = 10mv 88 100 112 mv v sense = 30mv 284 300 316 mv v sense = 50mv 480 500 520 mv v sense = 100mv 970 1000 1030 mv v sense = 500mv 4500 5000 5500 mv r out output resistance v sense- = 15v, v out = 1v 1.2 1.5 1.8 k v out v out 30 ppm/c t c temperature coefficient i cc supply current v sense- = 15v 170 270 350 a i sense+ v sense+ input current 48 90 a i sense- v sense- input current v sense- = 14.9v 70 220 na v cm(min) (b) minimum active common mode voltage v cc =15v 2.8 v v comp_supply = 5v v comp_in = v ref v sense = 10mv a cc accuracy v sense =100mv -3 3 % gain v out /v sense v sense = 100mv 9.7 10.0 10.3 bw bandwidth v sense =10mvp-p 3 mhz v sense = 100mvp-p 6 mhz comparator v comp_in input voltage 0.005 10 v v h hysteresis 15 mv i b input bias 5 80 150 na t d propagation delay 100 ns v ol output voltage low 30 150 200 mv v oh output voltage high v comp_ supply v i ol output sink current v ol = 0.4v 2 ma i oh output high leakage current 1.0 a voltage reference v ref reference current = +300 a to -5 a 1.200 1.240 1.280 v delta v ref change in v ref isource 5 a to isink 300 a 10 mv t c 30 ppm/c psr supply rejection 0.01 %/v
zxct1030 issue 2 - may 2007 5 www.zetex.com ? zetex semiconductors plc 2007 typical characteristics
zxct1030 issue 2 - may 2007 6 www.zetex.com ? zetex semiconductors plc 2007 voltage output current monitor referring to the block diagram, the current monitor takes the small voltage developed across the sense resistor (v sense ) and transfers it from the large common mode supply voltage to a ground- referenced signal with a gain of 10. the sense input common mode range is 2.2v to 20v. in this range, a linear output voltage is delivered. reference the bandgap reference allows the comparator to compare the translated vsense with threshold value chosen by the user which can be any voltage from 0 to 1.24v, configured by two external resistors which forms v comp_in . the output current which can be drawn from the comparator reference (i ref source) is limited to 5a, making potentiometers 250k suitable for setting a threshold level. where a lower potentiometer resistor value is used, an additional resistor value should be inserted between v ref and v cc to maintain sufficient current for the reference. (as shown in figure 1). figure 1: external resist or for reference level the voltage reference has a maximum current sink capability. this magnitude of current will be influenced by the value of r1 which is inserted between v ref and v cc . the value of current flowing through r1 can be expressed as: i = (v cc -v ref ) / r1 comparator the open collector output is active low and is asserted when v sense x 10 (v out ) > v comp_in . it can be connected to any voltage rail up to vin via a pull-up resistor. suggest values for the resistor are in the range of 10-100k . in the case where high load currents or a s hort circuit occurs, thus reducing the common mode signals (v+, v-) typically below 2.2v, the comparator will default to the asserted state. this can eliminate a closed loop system 'la tch-up' condition, allowing the controller to remove the applied power. stability to ensure stable operation of the zxct1030, it is recommended a decoupling capacitor is placed across the v cc and ground connections. a ceramic 10 f will be adequate.
zxct1030 issue 2 - may 2007 7 www.zetex.com ? zetex semiconductors plc 2007 intentionally left blank
zxct1030 issue 2 - may 2007 8 www.zetex.com ? zetex semiconductors plc 2007 package outline - so8 note: controlling dimensions are in inches. approx imate dimensions are provided in millimeters dim inches millimeters dim inches millimeters min. max. min. max. min. max. min. max. a 0.053 0.069 1.35 1.75 e 0.050 bsc 1.27 bsc a1 0.004 0.010 0.10 0.25 b 0.013 0.020 0.33 0.51 d 0.189 0.197 4.80 5.00 c 0.008 0.010 0.19 0.25 h 0.228 0.244 5.80 6.20 0 8 0 8 e 0.150 0.157 3.80 4.00 h 0.010 0.020 0.25 0.50 l 0.016 0.050 0.40 1.27 - - - - -
zxct1030 issue 2 - may 2007 9 www.zetex.com ? zetex semiconductors plc 2007 package outline - msop8 note: controlling dimensions are in millimeters. ap proximate dimensions are provided in inches dim millimeters inches min. max. min. max. a - 1.10 - 0.0433 a1 0.05 0.15 0.002 0.006 a2 0.75 0.95 0.0295 0.0374 b 0.25 0.40 0.010 0.0157 c 0.13 0.23 0.005 0.009 d 2.90 3.10 0.114 0.122 e 4.90 bsc 0.193 bsc e1 2.90 3.10 0.114 0.122 e 0.65 bsc 0.025 bsc l 0.40 0.70 0.0157 0.0192 r 0.07 - 0.0027 - r1 0.07 - 0.0027 - e c e e1 d b a1 a a2 r1 r l
zxct1030 issue 2 - may 2007 10 www.zetex.com ? zetex semiconductors plc 2007 definitions product change zetex semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. customers are solely responsible for obtaining th e latest relevant information before placing orders. applications disclaimer the circuits in this design/application note are offered as desi gn ideas. it is the responsibility of the user to ensure that t he circuit is fit for the user?s application and meets with the user?s requirements. no representation or warranty is given and no liability whatsoev er is assumed by zetex with respect to the accuracy or use of such in formation, or infringement of patents or other intellectual prop erty rights arising from such use or otherwise. zetex does not assume any le gal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory duty, restricti on or otherwise) for any damages, loss of profit, business, con tract, opportunity or consequential loss in the use of th ese circuit applications, under any circumstances. life support zetex products are specifically not authorized for use as critic al components in life support devices or systems without the ex press written approval of the chief executive officer of zetex semiconductors plc. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in t he labelling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devi ce or system whose failure to pe rform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. reproduction the product specifications contained in this publication are issu ed to provide outline information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the pr oducts or services concerned. terms and conditions all products are sold subjects to zetex? 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future device intended for production at some point. samples may be available ?active? product status recommended for new designs ?last time buy (ltb)? device will be discontinued and last time buy period and delivery is in effect ?not recommended for new designs? device is still in production to support existing designs and production ?obsolete? production ha s been discontinued datasheet status key: ?draft version? this term denotes a very early datasheet ver sion and contains highly provisional information, which may change in any manner without notice. ?provisional version? this term denotes a pre-release datasheet. it provides a clear indication of anticipated performance. however, changes to the test conditions and specif ications may occur, at any time and without notice. ?issue? this term denotes an issued datasheet cont aining finalized specifications. however, changes to specifications may occur, at any time and without notice. zetex sales offices europe zetex gmbh kustermann-park balanstra?e 59 d-81541 mnchen germany telefon: (49) 89 45 49 49 0 fax: (49) 89 45 49 49 49 europe.sales@zetex.com americas zetex inc 700 veterans memorial highway hauppauge, ny 11788 usa telephone: (1) 631 360 2222 fax: (1) 631 360 8222 usa.sales@zetex.com asia pacific zetex (asia ltd) 3701-04 metroplaza tower 1 hing fong road, kwai fong hong kong telephone: (852) 26100 611 fax: (852) 24250 494 asia.sales@zetex.com corporate headquarters zetex semiconductors plc zetex technology park, chadderton oldham, ol9 9ll united kingdom telephone: (44) 161 622 4444 fax: (44) 161 622 4446 hq@zetex.com ? 2007 published by zetex semiconductors plc
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