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 (cont.)
For best performance RSENSE should be connected as close to the S+ (and SENSE) pins; minimizing any series resistance with RSENSE.
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
ZXCT1080Q/81Q has been designed to operate with VSENSE of the order of 50mV to 150mV.
Current monitors' basic configuration is that of a unipolar voltage to current to voltage converter powered from a single supply rail. The internal
amplifier at the heart of the current monitor may well have a bipolar offset voltage but the output cannot go negative; this results in current
monitors saturating at very low sense voltages.
As a result of this phenomenon the ZXCT1080Q/81Q has been specified 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.
It is for this very reason that Diodes has specified an input offset voltage (VO(10)) at 10mV. The output voltage for any VSENSE voltage from 10mV to
150mV can be calculated as follows:
VOUT VSENSE G V10
Alternatively the load current can be expressed as:
IL
VOUT VO10
GxRSENSE
ZXCT1080Q/ ZXCT1081Q
Document number: DS37012 Rev. 1 - 2
9 of 11
www.diodes.com
March 2014
© Diodes Incorporated
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