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ZXCT1011
Issue 1- July 2005
7
www.zetex.com
?Zetex Semiconductors plc 2005
Application information (cont.)
Minimum operating voltage
The minimum operating voltage of the ZXCT1011 is 2.5V and is defined as the difference between
V
sense+
 and the I
out
 pin. It must be ensured that sufficient headroom is given for the operation of
the device when considering R
out
.
Figure 2   Considerations for supply rail
Voltage across device 2.5V
V
in
 - V
out
 2.5V
Where V
out
 = I
out
 x R
out
At low supply voltages and high Vsense measurements, special care must be taken to ensure the
correct operation.
The circuit in figure 2.0 shows a ZXCT1011 operating from 10V supply rail. The minimum
operating voltage of the ZXCT1011 is 2.5V. This allows a maximum output voltage of 7.5V to be
set at V
out
. A 3k   resistor on the output would draw a maximum 2.5mA from Iout. - See minimum
usable supply voltage graph on page 4.
V
sense+
ZXCT
1011
sense-
V
V
in
R
sense
load
To
I
out
2
5
4
3.3K
V
out
R
shunt
3
R
R
shunt
120R
= 10V
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