ZXCT1109EV1 USER GUIDE Performance Introduction • Current Monitor with wide supply range: 2.5V to 36V • Demonstrates high-side current monitoring up to 4A • Resistors on PCB set sense voltage and voltage gain The ZXCT1109EV1 evaluation circuit can simply be used to demonstrate the ZXCT1109 Current Monitor integrated circuit which is suitable for a wide range of power systems including automotive, industrial and white goods applications as well as portable and battery management systems. • The PCB is designed to accept one of three different current monitor products, the ZXCT1110 (U1), ZXCT1109 (U2) or ZXCT1107 (U3). Ambient temperature range -40°C to +125°C Ordering Information In this case the ZXCT1109 is fitted, but if desired, using conventional lab soldering and de-soldering techniques, this device can be removed and an alternative device fitted. Order Number ZXCT1109EV1 The ZXCT1109 provides an output voltage proportional to the current in an external load from two external resistors, a sense resistor and a gain set resistor, both are included on this PCB. This enables rapid evaluation of the ZXCT1109 for end user product design. The construction is a double-sided FR4 printed circuit board, 63.5 x 50.8 x 1.6 mm with 2oz/sq ft copper (70µm). . Issue 1 – April 2011 www.diodes.com © Diodes Incorporated 2011 1 of 8 ZXCT1109EV1 Fig. 1 – ZXCT1109EV1 Schematic Top Bottom Fig. 2 – ZXCT1109EV1 PCB Layout Symbol Parameter Min Max Units Vin Input Voltage 2.5 36 V TA Operating Ambient Temperature -40 125 °C Table 1 – Recommended Operating Conditions Issue 1 – April 2011 www.diodes.com © Diodes Incorporated 2011 2 of 8 ZXCT1109EV1 Count Designator Description Package Manufacturer 1 C1 Capacitor SMD, 10pF 100V COG 0805 generic 0 C2 1 R1 1206 generic 1 R2 0805 various 1 R3 0805 various 0 0 1 U1 U2 U3 SOT23 Diodes NOT FTTED Resistor, SMD, 0R05 1% 500mW 100ppm/ °C Resistor, SMD, 2.7k 1% 125mW, 250ppm/°C Resistor, SMD, 4.7k 1% 125mW, 250ppm/°C NOT FTTED ZXCT1109 NOT FTTED Part Number Farnell 109-9913 ZXCT1109SA-7 Table 2 – ZXCT1109EV1 Parts List Count Designator Description Function Manufacturer Part Number 1 TP1 Loop Terminal, 2.15mm, green Input Hughes 100-108 1 TP3 Loop Terminal, 2.15mm, green Ground Hughes 100-108 1 TP4 Loop Terminal, 2.15mm, green Load Hughes 100-108 1 TP5 Loop Terminal, 2.15mm, green Ground Hughes 100-108 1 TP6 Loop Terminal, 2.15mm, green Output Hughes 100-108 1 TP7 Loop Terminal, 2.15mm, green Ground Hughes 100-108 Table 3 – ZXCT1109EV1 I/O and Test Points Detailed Description As can be seen from the test setup in Figure 3, the ZXCT1109EV1 is designed to connect a power supply between test points TP1 and TP3, a load and DMM between test points TP4 and TP5, and a DMM to measure the output voltage between test points TP6 and TP7. The sense resistor is R1=50mΩ (+/-1%) such that a load current of 2A produces a nominal sense voltage input to the ZXCT1109 of 100mV. From the datasheet, a sense input of 100mV produces a o nominal output current of 408uA (+/- 3.4% at 25 C). The preferred value of R2=2.7kΩ (+/-1%) will therefore provide a nominal output voltage between TP6 and TP7 of 1.102V, giving a total voltage output error of +/-5.4% for the ZXCT1109EV1 circuit for a 2A load. As also described in the datasheet, resistor R3 provides S- input protection and together with C1 provides attenuation of possible load generated EMC that might affect the IC input bias conditions. Issue 1 – April 2011 www.diodes.com © Diodes Incorporated 2011 3 of 8 ZXCT1109EV1 Quick Start Guide Suitable test equipment is given in the Table 4. 5. DMM1 reads the output voltage and should read between 1.042V and 1.161V given the total circuit errors of +/-5.4% for 100mV sense input voltage. 1. Set the power supply to 10.0V but do not switch on. Set the current limit to 5.0A. 2. Connect up the ZXCT1109EV1 board to the equipment as in Figure 3 below. Set DMM1 to measure DC voltage. Set DMM2 to measure DC current. 6. Using an electronic load from zero to 4A load the measurements can be repeated to evaluate the circuit output voltage linearity & errors across the specified input voltage range. 3. Set the electronic load to draw a current of 2A or connect the 5Ω load resistor. Figures 4 to 6 demonstrate the product capability and possible VS+ errors (refer to datasheet). 4. Switch on the power supply and adjust the input voltage or the electronic load until DMM2 reads to 2.00A. 7. Switch off the supply and remove the test connections. This concludes the demonstration. POWER SUPPLY + - + DMM 1 - DMM 2 5R 25W LOAD RESISTOR OR PROGRAMMABLE LOAD Fig. 3 – ZXCT1109EV1 Demonstration Setup Count Description Manufacturer Part Number 1 Adjustable Dual PSU 35V / 4A TTi 354D 2 DMM Fluke 179 Load resistor, 5 ohms ± 5%, 25W up to 2A Welwyn WH25 5R JI TTi – 80V/80A/300W or Kikusui – 150V/15A/75W LD300 1 or Electronic Load up to 4A PLZ70UA & PLZ30F Table 4 – Suitable Test Equipment Issue 1 – April 2011 www.diodes.com © Diodes Incorporated 2011 4 of 8 ZXCT1109EV1 ZXCT1109EV1 - V OUT v I L OAD (V S+ = 10V , RGAIN=2.7k ohm , RSENSE =50m ohm , 25 oC) 2.5 V OUT (V) 2.0 1.5 1.0 0.5 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 ILOAD (A) Fig. 4 – ZXCT1109EV1: VOUT v ILOAD @ V S+ =10V ZXCT1109EV1 - V OUT v I L OAD (V S+ = 2.5V , RGAIN=2.7k ohm , RS ENSE =50m ohm , 25oC) 1.4 1.2 V OUT (V) 1.0 0.8 0.6 0.4 0.2 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 ILOAD (A) Fig. 5 – ZXCT1109EV1: VOUT v ILOAD @ V S+ =2.5V ZXCT1109EV1 V OU T v V S+ (ILOAD=4A, RGAIN=2.7k ohm , RSE NSE =50m ohm , 25oC) 2.5 V OUT (V) 2.0 1.5 1.0 0.5 0.0 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 V S+ (V ) Fig. 6 – ZXCT1109EV1: VOUT v VS+ @ I LOAD =4A Issue 1 – April 2011 www.diodes.com © Diodes Incorporated 2011 5 of 8 ZXCT1109EV1 INTENTIONALLY BLANK Issue 1 – April 2011 www.diodes.com © Diodes Incorporated 2011 6 of 8 ZXCT1109EV1 INTENTIONALLY BLANK Issue 1 – April 2011 www.diodes.com © Diodes Incorporated 2011 7 of 8 ZXCT1109EV1 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD 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). 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