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ZXCT1081
ZXCT1081  
Document number: DS32102 Rev. 1 - 2 
9 of 11
www.diodes.com
March 2010
?Diodes Incorporated 
 Product Line of
Diodes Incorporated
 
 
 
 
R
SENSE
C
D
R
LIM
ZXCT1081
SENSE
+
SENSE
-
 
 
 
 
Figure 2 Protection/Error Sources for ZXCT1081
 
 
 
 
Capacitor CD provides high frequency transient decoupling when used with R
LIM
; typical values are of the order 10pF.
 
For best performance R
SENS
E should be connected as close to the SENSE+ (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 ZXCT1081 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 ZXCT1081 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 Zetex 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
OUT
 = (V
SENSE
) xG + V
O(10)
 
 
Alternatively the load current can be expressed as:
 
 
I
L
 =
 
 
 
 
 
 
 
 
V
OUT
  V
O 10
 
GxR
SENSE
 
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