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ZXCT1020
Issue 1 - August 2007
11
www.zetex.com
?Zetex Semiconductors plc 2007
Application information
The ZXCT1020 has a V
B
 pin that is used to provide power to the current monitor. The maximum
voltage applied to the ZXCT1020 must be applied to this pin. The S+ and S- pins are used to
measure the current flowing to the load through the sense resistor. In normal use, the S+ is tied
to V
B
 via a shunt resistor, R
H
 making the ZXCT1020 essentially line powered.
The ZXCT1020 has a programmable gain set by the ratio of two external resistors R
G
 and R
SH
.
R
SH
 sets the transconductance whereas R
G
 set the gain and results in an output voltage defined
as:
Where V
SENSE
 = R
SENSE
 x I
L
The ZXCT1020 has been tested to the same conditions as the ZXCT1021 giving an overall voltage
gain of 10. The gain of the ZXCT1020 can be adjusted simply by varying R
G
. So to achieve a gain
of 50 R
G
 is increased from 15k to 75k. An alternative is to decrease R
SH
 from 1.5k to 300.
Decreasing R
SH
 increases the transconductance and, if for any given gain, reducing the R
SH
 will
reduce the overall output impedance.
To achieve a gain of 100, for example, the following resistor values could be used:
R
SH
 = 150 R
G
 = 15k
S+
S-
(LOAD)
V
B
I
L
R
SH
R
S
GND
V
OUT
5
4
-
+
1
ZXCT1020
2
3
R
G
OUT
R
G
R
SH
----------   V
SENSE
?/DIV>
=
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