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ZXCT1022
Issue 6 - March 2008
6
www.zetex.com
?Zetex Semiconductors plc 2008
Application information
The ZXCT1022 has a fixed dc voltage gain of 100. No external scaling resistors are required for
the output. Output voltage is simply defined as:
V
OUT
 = 100 x V
SENSE
 (V)
Where V
SENSE
 = V
IN
 - V
LOAD
PCB trace shunt resistor for low cost solution
Figure 1 shows a PCB layout suggestion for a low cost solution where a PCB resistive trace in
replacement for a conventional shunt resistor, can be used. The resistor section is 25mm x
0.25mm giving approximately 150m using 1 oz copper. Smaller resistances can be used if
required.
Total circuit solution: 1 component. Shows area of 150m
sense resistor compared to SOT23 package.
Practical tolerance of the PCB resistor will be around 5%
depending on manufacturing methods.
V
IN
V
OUT
GND
Figure 1 PCB layout suggestion
Load
ZXCT1021/2
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