ZXCT1110EV1 User Guide Issue 1

ZXCT1110EV1 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 ZXCT1110EV1 evaluation circuit can
simply be used to demonstrate the ZXCT1110
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 ZXCT1110 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
ZXCT1110EV1
The ZXCT1110 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
ZXCT1110 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
ZXCT1110EV1
Fig. 1 – ZXCT1110EV1 Schematic
Top
Bottom
Fig. 2 – ZXCT1110EV1 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
ZXCT1110EV1
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
SOT235
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
NOT FTTED
ZXCT1110
Part Number
Farnell 109-9913
ZXCT1110W5-7
Table 2 – ZXCT1110EV1 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 – ZXCT1110EV1 I/O and Test Points
Detailed Description
As can be seen from the test setup in Figure 3, the ZXCT1110EV1 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 ZXCT1110 of 100mV. From the datasheet, a sense input of 100mV produces a
o
nominal output current of 400uA (+/- 1.8% at 25 C).
The preferred value of R2=2.7kΩ (+/-1%) will therefore provide a nominal output voltage between TP6
and TP7 of 1.08V, giving a total voltage output error of +/-3.8% for the ZXCT1110EV1 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
ZXCT1110EV1
Quick Start Guide
Suitable test equipment is given in the Table 4.
5. DMM1 reads the output voltage and
should read between 1.039V and
1.121V given the total circuit errors of
+/-3.8% 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 ZXCT1110EV1 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. Connect the 5Ω load resistor or set the
electronic load to draw a current of 2A.
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 – ZXCT1110EV1 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
ZXCT1110EV1
ZXCT1110EV1 - 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 – ZXCT1110EV1: VOUT v ILOAD @ V S+ =10V
ZXCT1110EV1 - V OUT v I L OAD
(V S+ = 2.5V , RGAIN=2.7k ohm , RS ENSE =50m ohm , 25oC)
1.6
1.4
V OUT (V)
1.2
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 – ZXCT1110EV1: VOUT v ILOAD @ V S+ =2.5V
ZXCT1110EV1 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 – ZXCT1110EV1: VOUT v VS+ @ I LOAD =4A
Issue 1 – April 2011
www.diodes.com
© Diodes Incorporated 2011
5 of 8
ZXCT1110EV1
INTENTIONALLY BLANK
Issue 1 – April 2011
www.diodes.com
© Diodes Incorporated 2011
6 of 8
ZXCT1110EV1
INTENTIONALLY BLANK
Issue 1 – April 2011
www.diodes.com
© Diodes Incorporated 2011
7 of 8
ZXCT1110EV1
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).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements,
corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated
does not assume any liability arising out of the application or use of this document or any product described herein; neither
does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer
or user of this document or products described herein in such applications shall assume all risks of such use and will agree
to hold Diodes Incorporated 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 whatsoever in respect of any products purchased through
unauthorized sales channels. Should Customers purchase or use Diodes Incorporated products for any unintended or
unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless
against all claims, damages, expenses, 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 properly used in accordance with instructions for use
provided in the labeling 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
be 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
devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related
requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support
devices or systems, notwithstanding any devices- 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 arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2009, Diodes Incorporated
www.diodes.com
Sales offices
The Americas
Europe
Taiwan
Shanghai
Shenzhen
Korea
3050 E. Hillcrest Drive
Westlake Village,
CA 91362-3154
Tel: (+1) 805 446 4800
Fax: (+1) 805 446 4850
Kustermannpark
Balanstraße 59,
D-81541 München
Germany
Tel: (+49) 894 549 490
7F, No. 50,
Min Chuan Road
Hsin-Tien
Taipei, Taiwan
Tel: (+886) 289 146 000
Rm. 606, No.1158
Changning Road
Shanghai, China
Tel: (+86) 215 241 4882
Fax (+86) 215 241 4891
Room A1103-04,
ANLIAN Plaza, #4018
Jintian Road
Futian CBD,
Shenzhen, China
6 Floor, Changhwa B/D,
1005-5 Yeongtong-dong,
Yeongtong-gu, Suwon-si,
Gyeonggi-do, Korea 443-813
Tel: (+82) 312 731 884
Fax: (+49) 894 549 4949
Fax: (+886) 289 146 639
Tel: (+86) 755 882 849 88
Fax: (+86) 755 882 849 99
Fax: (+82) 312 731 885
Issue 1 – April 2011
www.diodes.com
© Diodes Incorporated 2011
8 of 8