ZXCT1080 ZETEX | Alldatasheet
Document overview
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Technical content
Features
3V to 60V continuous high side voltage Accurate high-side current sensing -40 to 125°C temperature range Output voltage scaling x10 4.5V to 12V V CC range Low quiescent current: 70µA supply pin 50µA I SENSE+ SOT23-5 package
Applications
Industrial applications current measurement Battery management Over current monitor Power management Automotive current measurement Pin connections Typical application circuit Device Package Part mark Reel size (inches) Tape width (mm) Quantity per reel ZXCT1080E5TA SOT23-5 1080 7 8 3000 VCC GND OUT OUT Vcc1 GND ZXCT1080 R SENSEINV CCV V OUT
Issue 1 - November 2007 2 www.zetex.com © Zetex Semiconductors plc 2007 Absolute maximum ratings Continuous voltage on S- and S+ -0.6 and 65V Voltage on all other pins -0.6V and +14V Differential sense voltage, V SENSE 800mV Operating temperature -40 to 125°C Storage temperature -55 to 150°C Maximum junction temperature 125°C Package power dissipation 300mW * at TA = 25°C Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. VSENSE is defined as the differential voltage between S+ and S- pins. * Assumes /H9052JA = 420°C/W Recommended operating conditions Pin function table Parameter Min. Max. Units VIN Common-mode sense+ input range 3 60 V VCC Supply voltage range 4.5 12 V VSENSE Differential sense input voltage range 0 0.15 V VOUT Output voltage range 0 1.5 V TA Ambient temperature range -40 125 °C Pin Name Description 1V CC This is the analogue supply and provides power to internal circuitry
2 GND Ground pin
3 OUT Output voltage pin. NMOS source follower with 20µA bias to ground
4 S+ This is the positive input of the curre nt monitor and has an input range from
60V down to 3V. The current through this pin varies with differential sense voltage
5 S- This is the negative input of the current monitor and has an input range
Issue 1 - November 2007 3 www.zetex.com © Zetex Semiconductors plc 2007
Electrical characteristics
Test conditions TA = 25°C, VIN = 12V, VCC = 5 V, VSENSE (a) = 100mV unless otherwise stated. NOTES: (a) VSENSE = "VSENSE+" - "VSENSE-" (b) The ZXCT1080 operates from a positive power rail and th e internal voltage-current converter current flow is unidirectional; these result in the output offset voltage for VSENSE = 0V always being positive. (c) For VSENSE > 10mV, the internal voltage-current converter is fully linear. This enables a true offset to be defined and used. VO(10) is expressed as the variance about an output voltage of 100mV> (d) Temperature dependent measurements are extracted from characterization and simulation results. (e) All Min and Max specifications over full temperature range are guaranteed by design and characterisation Symbol Parameter Conditions T A Min(e). Typ. Max(e). Units ICC VCC supply current V CC = 12V, VSENSE (a) = 0V 25°C 40 80 120 µA full range 145 IS+ S+ input current VSENSE (a) = 0V 25°C 15 27 42 µA full range 60 IS- S - i n p u t c u r r e n t 2 5 ° C 1 54 08 0n A VO(0) Zero VSENSE (a) error(b) 25°C 0 35 mV VO(10) Output offset voltage(c) VSENSE (a) = 10mV 25°C -25 +25 mV full range -55 +55 Gain /H9004VOUT//H9004VSENSE (a) VSENSE (a) = 10mV to 150mV 25°C 9.9 10 10.1 V/V full range 9.8 10.2 VOUT TC(d) VOUT variation with temperature 30 ppm/°C Acc Total output error -3 3 % IOH Output source current /H9004VOUT = -30mV 1 mA IOL Output sink current /H9004VOUT = +30mV 20 µA PSRR V CC supply rejection ratio VCC = 4.5V to 12V 54 60 dB CMRR Common-mode sense rejection ratio VIN = 60V to 3V 68 80 dB BW -3dB small signal bandwidth VSENSE (a) (AC) = 10mVPP 500 kHz
Issue 1 - November 2007 4 www.zetex.com © Zetex Semiconductors plc 2007 Typical characteristics Test conditions unless otherwise stated: TA = 25°C, VCC = 5V, VSENSE+ =12V, VSENSE = 100mV
Issue 1 - November 2007 5 www.zetex.com © Zetex Semiconductors plc 2007 Typical characteristics Test conditions unless otherwise stated: TA = 25°C, VCC = 5V, VSENSE+ =12V, VSENSE = 100mV
Issue 1 - November 2007 6 www.zetex.com © Zetex Semiconductors plc 2007 Typical characteristics Test conditions unless otherwise stated: TA = 25°C, VCC = 5V, VSENSE+ =12V, VSENSE = 100mV
Issue 1 - November 2007 7 www.zetex.com © Zetex Semiconductors plc 2007 Typical characteristics Test conditions unless otherwise stated: TA = 25°C, VCC = 5V, VSENSE+ =12V, VSENSE = 100mV
Issue 1 - November 2007 9 www.zetex.com © Zetex Semiconductors plc 2007 Figure 2 Protection/error sources for ZXCT1080 Capacitor CD provides high frequency transient decoupling when used with R LIM; typical values are of the order 10pF For best performance R SENSE should be connected as close to the S+ (and SENSE ) pins; minimizing any series resistance with RSENSE. When choosing appropriate values for R SENSE a compromise must be reached between in-line signal loss (including potential power dissipation effects) and small signal accuracy. Higher values for RSENSE gives better accuracy at low load currents by reducing the inaccuracies due to internal offsets. For best operation the ZXCT1080 has been designed to operate with V SENSE of the order of 50mV to 150mV. Current monitors' basic configuration is that of a unipolar voltage to current to voltage converter powered from a single supply rail. The internal amplifier at the heart of the current monitor may well have a bipolar offset voltage but the outp ut cannot go negative; this results in current monitors saturating at very low sense voltages. As a result of this phenomenon the ZXCT1080 has been specified to operate in a linear manner over a V SENSE range of 10mV to 150mV range, however it will still be monotonic down to VSENSE of 0V. It is for this very reason that Zetex has specified an input offset voltage (V O(10)) at 10mV. The output voltage for any VSENSE voltage from 10mV to 150mV can be calculated as follows: Alternatively the load current can be expressed as: R SENSE C D R LIM ZXCT1080 S+ S- VOUT VSENSE() xG V O1 0()+= IL VOUT VO1 0()–() GxR SENSE
Issue 1 - November 2007 10 www.zetex.com © Zetex Semiconductors plc 2007 Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches DIM Millimeters Inches Min. Max. Min. Max. A - 1.00 - 0.0393 A1 0.01 0.10 0.0003 0.0039 A2 0.84 0.90 0.0330 0.0354 b 0.30 0.45 0.0118 0.0177 c 0.12 0.20 0.0047 0.0078 D 2.90 BSC 0.114 BSC E 2.80 BSC 0.110 BSC E1 1.60 BSC 0.062 BSC e 0.95 BSC 0.0374 BSC e1 1.90 BSC 0.0748 BSC L 0.30 0.50 0.0118 0.0196 L2 0.25 BSC 0.010 BSC a° 4° 12° 4° 12°
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Issue 1 - November 2007 12 www.zetex.com © Zetex Semiconductors plc 2007 Zetex sales offices Europe Zetex GmbH Kustermannpark Balanstraße 59 D-81541 München 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 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 the 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 these circuit applications, under any circumstances. Life support Zetex products are specifically not authorized for use as critical components in life support devices or systems without the express 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 the 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 perform 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 products or services concerned. Terms and Conditions All products are sold subjects to Zetex’ terms and conditions of sale, and this disclaimer (save in the event of a conflict bet ween the two when the terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement. For the latest information on technology, delivery terms and conditions and prices, please contact your nearest Zetex sales office. Quality of product Zetex is an ISO 9001 and TS16949 certified semiconductor manufacturer. To ensure quality of service and products we strongly advise the purchase of parts dire ctly from Zetex Semiconductors or one of our regionally authorized distributors. For a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales channels. ESD (Electrostatic discharge) Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices. The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent of damage can vary from immediate functional or parametric malfunc tion to degradation of function or performance in use over ti me. Devices suspected of being affected should be replaced. Green compliance Zetex Semiconductors is committed to envir onmental excellence in all aspects of its operations which includes meeting or exce eding regulatory requirements with respect to the use of hazardous s ubstances. Numerous successful programs have been implemented to reduce the use of hazardous substances and/or emissions. All Zetex components are compliant with the Ro HS directive, and through this it is supporting its customers in their compliance with WEEE and ELV directives. Product status key: “Preview” 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 specifications 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.