ZXCT1050 ZETEX | Alldatasheet
Document overview
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Technical content
Features
- Accurate down to end current sensing Output voltage scaling x10 0 t o V CC-2V sense input range 2.7 to 20V supply range 50µA quiescent current SOT23-5 package
Applications
Power supply DC motor and solenoid control Battery management Over current monitor Power management Short circuit detection Pin connections Typical application circuit Order code Pack Part mark Reel size (inches) Tape width (mm) Quantity per reel ZXCT1050E5TA SOT23-5 1050 7 8 3000 SENSE- SENSE+ VCC GND OUT OUT VCC OUT SENSE+ SENSE- Load RSHUNT RGAIN RSENSE ZXCT1050 IN
Issue 1 - June 2007 2 www.zetex.com © Zetex Semiconductors plc 2007 Absolute maximum ratings VCC max. 20V Voltage on SENSE- and SENSE+ -0.6 to V CC Voltage on all other pins -0.6V and V CC +0.6V VSENSE = ‘(VSENSE+) - (VSENSE-)’ 500mV Operating temperature -40 to 125°C Storage temperature -55 to 150°C Maximum junction temperature 150°C Package power dissipation 300mW * at TA = 25°C (De-rate to zero for TJ = 150°C) Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. Recommended operating conditions Recommended resistor gain setting combinations Pin function table Parameter Min. Max. Units VSENSE+ Common-mode sense input range 0 V CC-2 V VCC Supply voltage range 2.7 20 V VSENSE Differential sense input voltage range 10 300 mV VOUT Output voltage range 0 V CC-2 V TA Ambient temperature range -40 125 °C Gain R SH RG 10 7.5k /H9024 3.75k/H9024 20 7.5k /H9024 7.5k/H9024 50 7.5k /H9024 18.7k/H9024 100 7.5k /H9024 37.5k/H9024 20 3.75k /H9024 3.75k/H9024 50 1.5k /H9024 3.75k/H9024 100 750 /H9024 3.75k/H9024 PIN Name Description 1V CC This is the analog supply and provides power to internal circuitry. 2 GND Ground pin. 3 OUT Output pin. A resistor, R GAIN, connected from this pin pin down to ground develops an output voltage.
4 SENSE+ This is the positive input of the current monitor and has an input range from
0V up to VCC – 2V.
5 SENSE- This is the negative input of the current monitor and has an input range from
0V up to VCC – 2V. The current through this pin varies with differential sense voltage. A resistor, RSHUNT, from this pin to the rail being sensed set the transconductance of the current monitor.
Issue 1 - June 2007 3 www.zetex.com © Zetex Semiconductors plc 2007
Electrical characteristics
Test conditions TA = 25°C, VSENSE+ = 10V, VCC = 12V, VSENSE = 100mV, RSH = 7.5k/H9024, RG = 3.75k/H9024. Symbol Parameter Conditions Min. Typ. Max. Units IQ VCC pin current V SENSE = 0V 45 70 µA VOUT Output voltage V SENSE = 0V =30mV =100mV =150mV 285 0.97 1.45 300 1.00 1.50 315 1.03 1.55 mV mV V V I SENSE+ VSENSE+ input current V SENSE = 0V 60 150 nA ISENSE- VSENSE- input current V SENSE = 0V 15 150 nA VOUT TC V OUT variation with temperature See note (*) NOTES: (*) Temperature dependent measurements are extracted from characterisation and simulation results. 300 ppm/°C Gain V OUT/VSENSE 10 Accuracy Total output error -3 3 % BW Bandwidth V SENSE(DC) = 10mV VSENSE(AC) = 10mVPP CL = 5pF, 300 kHz VSENSE(DC) = 100mV
0.8 MHz
VCC = 2.7V to 20V VSENSE+ = 0.7V 60 dB CMRR Common mode rejection ratio VCC = 20V VSENSE+ = 0 to 18V 70 dB
Issue 1 - June 2007 4 www.zetex.com © Zetex Semiconductors plc 2007 Typical characteristics RG = 3.75k/H9024, RSH = 7.5k/H9024 unless otherwise stated. Supply Current v Input Voltage ICC Supply Current (A) Supply Current v Supply Voltage ICC Supply Current (A) Sense- Current v Supply Voltage IS- Sense Current (A) Sense- Current v Temperature Percentage Change IS- (%) Supply Current v Sense Voltage ICC Supply Current (A) Sense- Current v Sense Voltage IS- Sense Current (A)
Issue 1 - June 2007 5 www.zetex.com © Zetex Semiconductors plc 2007 Typical characteristics RG = 3.75k/H9024, RSH = 7.5k/H9024 unless otherwise stated. 1E-3 0.01 0.1 10m 100m -20 -15 -10 -5 0 5 10 15 20 900 950 1000 1050 1100 0 50m 100m 150m 9.9 10.0 10.1 0 2 4 6 8 1 01 21 41 61 82 0 0 5 10 15 20 -12 -40 -20 0 20 40 60 80 100 120 VOUT - Output Voltage (V) VOUT v Load Current VOUT - Output Voltage (mV) μ Incremental Gain v Sense Voltage Incremental Gain Common Mode Characteristic ΔVOUT - Output Voltage (mV) Supply Characteristic ΔVOUT - Output Voltage (mV) Temperature Characteristic ΔVOUT Output Voltage (mV)
Issue 1 - June 2007 6 www.zetex.com © Zetex Semiconductors plc 2007 Typical characteristics RG = 3.75k/H9024, RSH = 7.5k/H9024 unless otherwise stated. Referred to 1V
Issue 1 - June 2007 7 www.zetex.com © Zetex Semiconductors plc 2007 Applications information The ZXCT1050 is a current output version of the ZX CT1051 and as such uses a separate power supply pin. All biasing for the internal amplifiers comes from its separate VCC input and is not ‘line powered’, unlike the ZXCT1021. This means that at very small sense voltages the ZXCT1050 draws very little current (<1/H9262A) from the lines being sensed. The separate V CC pin enables the ZXCT1050 to be operated at sense line voltages down to 0V, where the ZXCT1021 would switch off. This feature enables the ZXCT1050 to be used to sense the currents flowing through lines that have been shorted to ground. Basic operation Load current, I L, from V RAIL is drawn through R SENSE developing a voltage V SENSE across the sense inputs of the ZXCT1050. The internal amplifier forces V SENSE across external resistance R SH (internal on the ZXCT1051) causing a current to flow through transistor Q1 and out of the output pin, OUT. This current is then converted to a voltage by a resistor, RG, between OUT and GND. The overall gain of the ZXCT1050 is determined by the following expression: A ratio of 1:2 between RSH and RG creates the fixed gain of 10 with an output impedance equal to RG (see electrical characteristics for output current-voltage characteristics). The ZXCT1050 has both R G and R SH external. This allows R G and R SH to be varied so that the required gain can be achieved at the required output impedance. For low power applications both RG and RSH can be increased whereas for driving low impedance RG and RSH can be decreased. The maximum recommended value for R G is 40k /H9024 and the maximum recommended value for RSH is 10k/H9024. Large values of RSH start increasing the effective input offset error, while large values of RG can created load errors and reduce bandwidths. The maximum differential input voltage, VSENSE, is 150mV (IL * RSENSE); however voltages up to 500mV will not damage it. This can be increased further by the inclusion of a resistor, R LIM, between the SENSE+ pin and the rail being sensed, VRAIL. For best performance RSENSE should be connected as close to the SENSE+ and SENSE- pins thus minimizing any series resistance with RSENSE. ZXCT1050 SENSE+ (4) Out (3) (5) SENSE- VCC (1) VRAIL RSENSE RSH I L Load RG GND (2)GND GAIN 20 RG RSH
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Issue 1 - June 2007 9 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°
Issue 1 - June 2007 10 www.zetex.com © Zetex Semiconductors plc 2007 Zetex sales offices Europe Zetex GmbH Kustermann-park 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
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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.