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ZXCT1080
HIGH VOLTAGE HIGH-SIDE CURRENT MONITOR
 
ZXCT1080  
Document number: DS33454 Rev. 4 - 2 
9 of 11
www.diodes.com
December 2011
?Diodes Incorporated 
Application Information (cont.) 
 
 
 
Fig. 21 Protection/Error Sources for ZXCT1080
 
Capacitor C
D
 provides high frequency transient decoupling when used with R
LIM
; typical values are of the order 10pF.
 
For best performance R
SENSE
 should be connected as close to the S+ (and SENSE) pins; minimizing any series resistance
with R
SENSE
.
 
When choosing appropriate values for R
SENSE
 a compromise must be reached between in-line signal loss (including potential
power dissipation effects) and small signal accuracy.
 
Higher values for R
SENSE
 gives better accuracy at low load currents by reducing the inaccuracies due to internal offsets. For
best operation the ZXCT1080 has been designed to operate with V
SENSE
 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 ZXCT1080 has been specified to operate in a linear manner over a V
SENSE
 range of
10mV to 150mV range, however it will still be monotonic down to V
SENSE
 of 0V.
 
It is for this very reason that Diodes has specified an input offset voltage (V
O(10)
) at 10mV. The output voltage for any V
SENSE
 
voltage from 10mV to 150mV can be calculated as follows:
 
(  )
V
G
V
V
10
SENSE
OUT
+
?/DIV>
=
 
 
Alternatively the load current can be expressed as:
 
(  )
GxR
V
V
I
SENSE
10
O
OUT
L

=
 
 
 
 
 
 
 
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