ZXCT1081Q View Datasheet(PDF) - Diodes Incorporated.
Part Name
Description
Manufacturer
ZXCT1081Q Datasheet PDF : 11 Pages
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A Product Line of
Diodes Incorporated
ZXCT1080Q/ ZXCT1081Q
Application Information
The ZXCT1080Q and ZXCT1081Q have been designed to allow them to operate with 5V supply rails while sensing common mode signals up to
60V and 40V respectively. This makes it well suited to a wide range of current measuring/monitoring applications that require the interface to 5V
systems while sensing much higher voltages.
To allow this its VCC pin can be used independently of S+.
Figure 20 shows the basic configuration of the ZXCT1080Q and ZXCT1081Q.
Fig. 20 Typical Configuration of ZXCT1080Q/81Q
Load current from the input is drawn through RSENSE developing a voltage VSENSE across the inputs of the ZXCT1080Q/81Q.
The internal amplifier forces VSENSE across internal resistance RGT causing a current to flow through MOSFET M1. This current is then converted to
a voltage by RG. A ratio of 10:1 between RG and RGT creates the fixed gain of 10. The output is then buffered by the unity gain buffer.
The gain equation of the ZXCT1080Q and ZXCT1081Q is:
VOUT
ILRSENSE
RG
RGT
1
IL
R x SENSE
10
The maximum recommended differential input voltage, VSENSE, is 150mV; it will however withstand voltages up to 800mV. This can be increased
further by the inclusion of a resistor, RLIM, between S- pin and the load (see figure 21); typical value is of the order of 10k.
Fig. 21 Protection/Error Sources for ZXCT1080
Capacitor CD provides high frequency transient decoupling when used with RLIM; typical values are of the order 10pF.
ZXCT1080Q/ ZXCT1081Q
Document number: DS37012 Rev. 1 - 2
8 of 11
www.diodes.com
March 2014
© Diodes Incorporated
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