Microsoft Word - ZXCT1030X8_R1

Document overview

  • Manufacturer or author: Garion_Campbell
  • PDF pages: 7

Technical content

Features

  • Low cost, accurate high-side current sensing
  • Output voltage scaling
  • Up to 18V output
  • 2.2V - 20V supply range
  • Voltage reference on chip
  • Comparator on chip
  • MSOP8 package

Applications

  • Battery chargers
  • Electronic fuse
  • DC motor control
  • Over current monitor
  • Power management
  • Inrush current limiting Typical Application Circuit VCC VSENSE- VSENSE+ GND VCOMP_OUT VOUT Vref_out VCOMP_IN

Document number: DS32183 Rev. 1 - 6 2 of 7 www.diodes.com May 2010 © Diodes Incorporated A Product Line of Diodes Incorporated Obsolete Variant Use ZXCT1030N8TA Pin Description Pin Name Function VCC Supply voltage VSENSE- Negative sense input VSENSE+ Positive sense input GND Ground VCOMP_IN Comparator input, usually a ratio of the reference or other control signal VREF_OUT Reference output VOUT Current monitor output voltage VCOMP_OUT Open collector comparator output Absolute Maximum Ratings Parameter Rating Unit Voltage on any pin -0.6 and VCC +0.6 V Operating Temperature -40 to 85 °C Storage Temperature -55 to 125 °C Package Power Dissipation (TAMB = 25) °C SO8 MSOP8 700 500 mW Recommended Operating Conditions Parameter Min Max Units VCC 2.2 20 V VSENSE+ 2.2 VCC V VSENSE (a) 10 500 mV VOUT 0 VSENSE-1V V VCOMP_IN 0.005 10 V TAMB -40 85 °C

Document number: DS32183 Rev. 1 - 6 3 of 7 www.diodes.com May 2010 © Diodes Incorporated A Product Line of Diodes Incorporated Obsolete Variant Use ZXCT1030N8TA VCOMP_SUPPLY = 5V unless otherwise stated. Symbol Paramete r Condition Min. Typ. Max. Unit VCC VCC Range 2.2 20 V VSENSE+ Sense+ Range 2.2 VCC VOUT Output Voltage VSENSE = 0 VSENSE = 10 VSENSE = 30 VSENSE = 50 VSENSE = 100 VSENSE = 500 284 480 970 4500 100 300 500 1000 5000 112 316 520 1030 5500 mV ROUT Output Resistance VSENSE - = 15V, VOUT = 1V 1.2 1.5 1.8 k Ω VOUT TC VOUT Temperature Coefficient 30 ppm/°C ICC Supply Current VSENSE - = 15V 170 270 350 µA ISENSE+ VSENSE+ Input Current 25 48 90 µA ISENSE- VSENSE- Input Current VSENSE- = 14.9V 25 70 220 nA VCM(MIN) (d) Minimum Active Common Mode Voltage VCC = 15V VCOMP_SUPPLY = 5V VCOMP_IN = VREF VSENSE = 10mV 2.8 V ACC Accuracy VSENSE = 100mV -3 3 % GAIN VOUT/VSENSE VSENSE = 100mV 9.7 10.0 10.3 BW Bandwidth VSENSE = 10mVp-p VSENSE = 100mVp-p 3

6 MHz

VCOMP_IN Input Voltage 0.005 10 V VH Hysteresis 15 mV IB Input Bias 5 80 150 nA TD Propagation Delay 100 ns VOL Output Voltage Low 30 150 200 mV VOH Output Voltage High VCOMP_ SUPPLY IOL Output Sink Current Vol = 0.4V 2 mA IOH Output High Leakage Current 1.0 µA Voltage Reference VREF Reference Current = +300µA to -5µA 1.200 1.240 1.280 V Delta VREF Change in V REF ISOURCE 5µA to ISINK 300µA 10 mV TC 30 ppm/°C PSR Supply Rejection 0.01 %/V Notes: (c) (V SENSE+) – (VSENSE-) (d) Level of V SENSE+ where comparator output defaults to ‘off’.

Document number: DS32183 Rev. 1 - 6 4 of 7 www.diodes.com May 2010 © Diodes Incorporated A Product Line of Diodes Incorporated Obsolete Variant Use ZXCT1030N8TA Typical Application Circuits

Document number: DS32183 Rev. 1 - 6 5 of 7 www.diodes.com May 2010 © Diodes Incorporated A Product Line of Diodes Incorporated Obsolete Variant Use ZXCT1030N8TA 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 compar ator to compare the translated V SENSE with threshold value chosen by the user which can be any voltage from 0 to 1.24V, configured by two external resistors which forms VCOMP_IN. The output current which can be draw n from the comparator reference (I REF source) is limited to 5 μA, making potentiometers ≥250kΩ 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 cu rrent for the reference. (as shown in Figure 1). Figure 1: External Resistor for Reference Level The voltage reference has a maximum current sink capability. Th is magnitude of current will be influenced by the value of R1 which is inserted between VREF and VCC. The value of current flowing through R1 can be expressed as: I = (VCC -VREF) / 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 10-100kΩ. In the case where high load currents or a short circuit occu rs, 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 'latch-up' condition, allowing the controller to remove the applied power. Stability To ensure stable operation of t he ZXCT1030, it is recommended a decoupling capacitor is placed across the V CC and ground connections. A ceramic 10µF will be adequate.

Document number: DS32183 Rev. 1 - 6 6 of 7 www.diodes.com May 2010 © Diodes Incorporated A Product Line of Diodes Incorporated Obsolete Variant Use ZXCT1030N8TA

Ordering Information

Device Status Package Device Marking Reel Size (inches) Tape Width (mm) Quantity Per reel ZXCT1030X8TA Obsolete MSOP8 ZXCT1030 7 12 1000

Document number: DS32183 Rev. 1 - 6 7 of 7 www.diodes.com May 2010 © Diodes Incorporated A Product Line of Diodes Incorporated Obsolete Variant Use ZXCT1030N8TA IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability ari sing out of the application or use of this document or any product described her ein; neither does Diodes Incor porated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or us er of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold Diodes In corporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability what soever in respect of any pr oducts purchased through unauthoriz ed sales channel. Should Customers purchase or use Diodes In corporated products for any unintended or unauthorized application, Customers shall i ndemnify and hold Diodes Incorporated and its representatives harmless a gainst all claims, damages, expens es, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated 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 Diodes Incorporated. 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 prop erly used in accordance with in structions for use provided in the labeling can be reasonably expected to re sult 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. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible fo r all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-cri tical, life support devices or systems, notwithstanding any devic es- or systems- related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages aris ing out of the use of Diodes Incorporated products in such safety-critical, life su pport devices or systems. Copyright © 2010, Diodes Incorporated www.diodes.com