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ZXCT1011
Issue 1- July 2005
5
www.zetex.com
?Zetex Semiconductors plc 2005
Pin description
Application information
Design example
The following lines describe how to scale a load current to an output voltage.
V
sense
 = (V
sense+
) - (V
sense-
) = I
load
 x R
sense
Defining then
I
out
 = Iq + V
sense
 x g
m
since
g
m
= 1.2 / R
shunt
I
out
    = Iq + [ (V
sense
 x 1.2) / R
shunt
 ]
 
= Iq + [ (1.2 x I
load
 x R
sense
 / R
shunt
) ]
Note: Iq is embedded into the specification of the ZXCT1011 and therefore appears an offset error.
 4 V
out
 = (R
out
 x I
offset
) + [(1.2 x R
out
 x I
load
 x R
sense
) / R
shunt
]
The output current of the ZXCT1011 is directly related to the size of the trimming resistor used. It
is important to ensure the tolerance of R
shunt
 is considered. A 1% change in R
shunt
 will cause a
1% change in output.
Consider the following: -
Pin no.    Pin name
Pin function
1
N/C
No connection
2
I
out
Output current - follows transconductance of sense voltage g
m
 = 10mA/V
for R
shunt
=120
3
R
shunt
Trimming resistor Input. - used to trim gain value 60 R
shunt
 240
4
V
sense-
Low side current sense input.  connect to load/battery etc. Must be
lower than V
sense+
for correct operation. Cannot be grounded
without additional series resistor.
5
V
sense+
High side current sense input.  Connect to supply rail. Must be
higher than V
sense+
 for correct operation.
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