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| ZXCT1051 Precision wide input range current monitor Description The ZXCT1051 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 ZXCT1051 can be used on the high or low side of the load. 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. The ZXCT1051 provides a fixed gain of 10 thereby removing the need for an additional resistor. Features * * * * * * * Accurate down to end current sensing Output voltage scaling x10 0 to VCC-2V sense input range 2.7 to 20V supply range 50 A quiescent current 1% typical accuracy 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 VSENSE+ RSENSE VSENSE- VCC GND VOUT VSENSEVSENSE+ VSENSEVCC ZXCT1051 GND VOUT VSENSE+ VOUT Ordering information Order code ZXCT1051E5TA Package SOT23-5 Partmark 1051 Reel size (inches) 7 Tape width (mm) 8 Quantity per reel 3,000 Issue 2 - November 2006 (c) Zetex Semiconductors plc 2006 1 www.zetex.com ZXCT1051 Absolute maximum ratings VCC max. Voltage on VSENSE- and VSENSE+ Voltage on all other pins VSENSE "(VSENSE+) - (VSENSE-) Operating temperature, Tamb 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 Tamb = 25C (de-rate to zero at 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 Parameter VSENSE+ VCC VSENSE VOUT Tamb Common-mode sense input range Supply voltage range Differential sense input voltage range Output voltage range Ambient temperature range Min. 0 2.7 0 0 -40 Max. VCC-2 20 0.3 VCC - 2 125 Units V V V V C Pin function table Pin 1 2 3 4 5 Name VCC GND OUT VSENSE+ VSENSEDescription This is the analog supply and provides power to internal circuitry Ground pin Output voltage pin. 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. Issue 2 - November 2006 (c) Zetex Semiconductors plc 2006 2 www.zetex.com ZXCT1051 Electrical characteristics Test conditions Tamb = 25C, VSENSE+ = 10V, VCC = 12V, VSENSE = 100mV Symbol IQ VOUT Parameter VCC pin current Output voltage Conditions VSENSE = 0V VSENSE = 0V =30mV =100mV =150mV 0 291 0.98 1.45 Min. Typ. 45 6 300 1.00 1.50 10 60 Max. 70 15 309 1.02 1.55 150 150 300 2.5 3.75 10 -2 VSENSE(DC) VSENSE(AC) = 10mV = 10mVPP CL = 5pF, VSENSE(DC) = 100mV 300 1 58 2 % kHz MHz dB 5 Units A mV mV V V nA nA ppm/C k ISENSE+ ISENSEVOUT TC ROUT Gain Accuracy BW VSENSE+ input current VSENSE = 0V VSENSE- input current VSENSE = 0V VOUT variation with temperature Output resistance VOUT/VSENSE Total output error Bandwidth See note (b) PSRR Power supply VCC = 2.7V to 20V rejection ratio refered VSENSE- = 0V to output Common mode VCC = 20V rejection ratio refered VSENSE+ = 0 to 18V to output CMRR 66 dB NOTES: (a) VSENSE = "VSENSE+" - "VSENSE-" (b) Temperature dependent measurements are extracted from characterization and simulation results. Issue 2 - November 2006 (c) Zetex Semiconductors plc 2006 3 www.zetex.com ZXCT1051 Typical characteristics 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 2 - November 2006 (c) Zetex Semiconductors plc 2006 4 www.zetex.com ZXCT1051 Typical characteristics VOUT - Output Voltage (V) 10 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) 18 16 14 12 10 8 6 4 2 0 -2 -4 -6 -8 0 2 4 6 8 10 12 14 16 18 20 Incremental Gain v Sense Voltage VOUT - Output Voltage (mV) 12 8 4 0 -4 -8 -12 0 5 10 15 20 Common Mode Characteristic Supply Characteristic Issue 2 - November 2006 (c) Zetex Semiconductors plc 2006 5 www.zetex.com ZXCT1051 Typical characteristics 20 70 Supply Rejection (dB) 1k 10k 100k 1M 10M 10 60 50 40 30 20 10 0 1000 10000 100000 1000000 1E7 Gain (dB) 0 -10 -20 -30 -40 -50 -60 100 Bandwidth Common Mode Rejection (dB) 90 80 70 60 50 40 30 20 10 0 100 1k 10k 100k 1M 1.2 PSRR VOUT - Output Voltage (V) 1.0 0.8 0.6 0.4 0.2 0.0 0 2 4 6 8 10 CMRR 1.02 Large Signal Pulse Response VOUT - Output Voltage (V) 1.00 0.98 0.96 0.94 0.92 0.90 0.88 0 2 4 6 8 10 VOUT - Output Voltage (V) 12 10 8 6 4 2 0 0 5 10 15 20 25 30 35 40 Small Signal Pulse Response Turn on/off Characteristic Issue 2 - November 2006 (c) Zetex Semiconductors plc 2006 6 www.zetex.com ZXCT1051 Application information The ZXCT1051 is Zetex' first current monitor with 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 ZXCT1051 draws very little current (<1A) from the lines being sensed. The separate VCC pin enables the ZXCT1051 to be operated at sense line voltages down to 0V, where the ZXCT1021 would switch off. This feature enables the ZXCT1051 to be used to sense the currents flowing through lines that have been shorted to ground and is Zetex' first current monitor to do this. RSENSE VRAIL VSENSE+ VCC Load VSENSE- Q1 RSH RG VOUT GND GND Basic operation Load current from VIN is drawn through RSENSE developing a voltage VSENSE across the ZXCT1051. The internal amplifier forces VSENSE across internal resistance RSH causing a current to flow through transistor Q1. This current is then converted to a voltage by RG. A ratio of 10:1 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 gain equation of the ZXCT1051 is: RG V SENSE = I L R SENSE ---------- x 1 R SH 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 VSENSE- pin and the load. For best performance RSENSE should be connected as close to the VSENSE+ and VSENSE- pins thus minimizing any series resistance with RSENSE. Issue 2 - November 2006 (c) Zetex Semiconductors plc 2006 7 www.zetex.com ZXCT1051 The ZXCT1051 has been designed to allow it to operate from supplies (VCC) ranging from 2.7V to 20V while sensing common mode signals from 0V up to VCC -2V. When choosing appropriate values for RSENSE 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 ZXCT1051 has been designed to operate with VSENSE of the order of 50mV to 150mV. Due to the very nature of current monitors they tend to saturate at very low sense voltages. This is due to them being operated from single supply and that the basic configuration is that of a unipolar voltage to current to voltage converter. The internal amplifiers at the heart of the current monitor may well have a bipolar offset voltage but the output cannot go negative. For this reason the ZXCT1051 has been designed to operate in a linear manner over a VSENSE range of 10mV to 150mV range, however it will still be monotonic down to VSENSE of 0V. The device has a fixed DC voltage gain of 10; no external scaling resistors are required for the output. Output voltage is simply defined as: VOUT = gain x VSENSE (V) Issue 2 - November 2006 (c) Zetex Semiconductors plc 2006 8 www.zetex.com ZXCT1051 Packaging details - SOT23-5 DIM A A1 A2 b C D E E1 e e1 L a Min. 0.90 0.00 0.90 0.20 0.09 2.70 2.20 1.30 Millimeters Max. 1.45 0.15 1.30 0.50 0.26 3.10 3.20 1.80 0.95 REF 1.90 REF 0.10 0 0.60 30 0.0039 0 Min. 0.0354 0.00 0.0354 0.0078 0.0035 0.1062 0.0866 0.0511 Inches Max. 0.0570 0.0059 0.0511 0.0196 0.0102 0.1220 0.1181 0.0708 0.0374 REF 0.0748 REF 0.0236 30 Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches Issue 2 - November 2006 (c) Zetex Semiconductors plc 2006 9 www.zetex.com ZXCT1051 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 or visit: www.zetex.com 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) 2006 Published by Zetex Semiconductors plc Issue 2 - November 2006 (c) Zetex Semiconductors plc 2006 10 www.zetex.com |
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