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| ZXCT1050 Precision wide input range current monitor Description The ZXCT1050 is a wide input range current monitor, which operates over a range of input voltages from ground up to VCC-2V. As a result the ZXCT1050 can be used on the high or low side of the load. The ZXCT1050 provides variable gain by using two external resistors. The first of which sets the transconductance and the second setting the overall gain. The very low offset voltage enables a typical accuracy of 1% for sense voltages of only 30mV, giving better tolerances for small sense resistors necessary at higher currents. Features * * * * * * Accurate down to end current sensing Output voltage scaling x10 0 to VCC-2V sense input range 2.7 to 20V supply range 50A 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 VCC 1 GND 2 5 Typical application circuit SENSEIN RSENSE RSHUNT SENSE+ SENSE- OUT 3 4 SENSE+ VCC ZXCT1050 Load OUT OUT RGAIN Ordering information Order code ZXCT1050E5TA Pack SOT23-5 Part mark 1050 Reel size (inches) 7 Tape width (mm) 8 Quantity per reel 3000 Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 1 www.zetex.com ZXCT1050 Absolute maximum ratings VCC max. Voltage on SENSE- and SENSE+ Voltage on all other pins VSENSE = `(VSENSE+) - (VSENSE-)' Operating temperature Storage temperature Maximum junction temperature Package power dissipation 20V -0.6 to VCC -0.6V and VCC +0.6V 500mV -40 to 125C -55 to 150C 150C 300mW* at TA = 25C (De-rate to zero for TJ = 150C) 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 VSENSE+ VCC VSENSE VOUT TA Parameter Common-mode sense input range Supply voltage range Differential sense input voltage range Output voltage range Ambient temperature range Min. 0 2.7 10 0 -40 Max. VCC-2 20 300 VCC-2 125 Units V V mV V C Recommended resistor gain setting combinations Gain 10 20 50 100 20 50 100 RSH 7.5k 7.5k 7.5k 7.5k 3.75k 1.5k 750 RG 3.75k 7.5k 18.7k 37.5k 3.75k 3.75k 3.75k Pin function table PIN 1 2 3 4 5 Name VCC GND OUT SENSE+ SENSEDescription This is the analog supply and provides power to internal circuitry. Ground pin. Output pin. A resistor, RGAIN, connected from this pin pin down to ground develops an output voltage. This is the positive input of the current monitor and has an input range from 0V up to VCC - 2V. 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. 2 www.zetex.com Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 ZXCT1050 Electrical characteristics Test conditions TA = 25C, VSENSE+ = 10V, VCC = 12V, VSENSE = 100mV, RSH = 7.5k , RG = 3.75k . Symbol IQ VOUT Parameter VCC pin current Output voltage Conditions VSENSE = 0V VSENSE = 0V =30mV =100mV =150mV 0 285 0.97 1.45 Min. Typ. 45 3 300 1.00 1.50 60 15 Max. 70 15 315 1.03 1.55 150 150 300 10 -3 VSENSE(DC) = 10mV VSENSE(DC) = 100mV PSRR CMRR Power supply rejection ratio Common mode rejection ratio VSENSE(AC) = 10mVPP CL = 5pF, 300 0.8 60 70 3 % kHz MHz dB dB Units A mV mV V V nA nA ppm/C ISENSE+ ISENSEVOUT TC Gain Accuracy BW VSENSE+ input current VSENSE = 0V VSENSE- input current VSENSE = 0V VOUT variation with temperature VOUT/VSENSE Total output error Bandwidth See note (*) VCC = 2.7V to 20V VSENSE+ = 0.7V VCC = 20V VSENSE+ = 0 to 18V NOTES: (*) Temperature dependent measurements are extracted from characterisation and simulation results. Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 3 www.zetex.com ZXCT1050 Typical characteristics RG = 3.75k , RSH = 7.5k unless otherwise stated. ICC Supply Current (A) ICC Supply Current (A) Supply Current v Supply Voltage Supply Current v Input Voltage ICC Supply Current (A) IS- Sense Current (A) Supply Current v Sense Voltage Sense- Current v Supply Voltage Percentage Change IS- (%) Sense- Current v Temperature IS- Sense Current (A) Sense- Current v Sense Voltage Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 4 www.zetex.com ZXCT1050 Typical characteristics RG = 3.75k , RSH = 7.5k unless otherwise stated. 10 VOUT - Output Voltage (V) VOUT Output Voltage (mV) 1 5 100m 0 10m 1E-3 0.01 0.1 -5 -40 -20 0 20 40 60 80 100 120 Temperature Characteristic VOUT - Output Voltage (mV) 1100 10.1 1050 Incremental Gain -15 -10 -5 0 5 10 15 20 1000 10.0 950 900 -20 9.9 0 50m 100m 150m VOUT v Load Current VOUT - Output Voltage (mV) VOUT - Output Voltage (mV) 18 16 14 12 10 8 6 4 2 0 -2 -4 -6 -8 12 8 4 0 -4 -8 -12 Incremental Gain v Sense Voltage 0 2 4 6 8 10 12 14 16 18 20 0 5 10 15 20 Common Mode Characteristic Supply Characteristic Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 5 www.zetex.com ZXCT1050 Typical characteristics RG = 3.75k , RSH = 7.5k unless otherwise stated. Referred to 1V Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 6 www.zetex.com ZXCT1050 Applications information The ZXCT1050 is a current output version of the ZXCT1051 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 A) from the lines being sensed. The separate VCC 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. VRAIL SENSE+ (4) R SENSE R SH (5) SENSE- IL VCC (1) Load Q1 Out (3) RG ZXCT1050 GND Basic operation GND (2) Load current, IL, from VRAIL is drawn through RSENSE developing a voltage VSENSE across the sense inputs of the ZXCT1050. The internal amplifier forces VSENSE across external resistance RSH (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: RG GAIN = 20 x --------R SH 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 RG and RSH external. This allows RG and RSH 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 RG is 40k and the maximum recommended value for RSH is 10k . 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, RLIM, 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. Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 7 www.zetex.com ZXCT1050 Intentionally left blank Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 8 www.zetex.com ZXCT1050 Package outline - SOT23-5 DIM A A1 A2 b c D E E1 e e1 L L2 a Min. 0.01 0.84 0.30 0.12 Millimeters Max. 1.00 0.10 0.90 0.45 0.20 2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 1.90 BSC 0.30 0.25 BSC 4 12 4 0.50 0.0118 Min. 0.0003 0.0330 0.0118 0.0047 Inches Max. 0.0393 0.0039 0.0354 0.0177 0.0078 0.114 BSC 0.110 BSC 0.062 BSC 0.0374 BSC 0.0748 BSC 0.0196 0.010 BSC 12 Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 9 www.zetex.com ZXCT1050 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 design ideas. It is the responsibility of the user to ensure that the circuit is fit for the user's application and meets with the user's requirements. No representation or warranty is given and no liability whatsoever is assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory duty, restriction or otherwise) for any damages, loss of profit, business, contract, 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 properly 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 device 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 issued 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 between 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 directly 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 malfunction to degradation of function or performance in use over time. Devices suspected of being affected should be replaced. Green compliance Zetex Semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding regulatory requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to reduce the use of hazardous substances and/or emissions. All Zetex components are compliant with the RoHS 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 has been discontinued Datasheet status key: "Draft version" This term denotes a very early datasheet version 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 containing finalized specifications. However, changes to specifications may occur, at any time and without notice. Zetex sales offices Europe Zetex GmbH Kustermann-park Balanstrae 59 D-81541 Munchen 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 (c) 2007 Published by Zetex Semiconductors plc Issue 1 - June 2007 (c) Zetex Semiconductors plc 2007 10 www.zetex.com |
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