ZXCT1021

Issue 9 - July 2007

6

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© Zetex Semiconductors plc 2007

Application information

The ZXCT1021 has a fixed dc voltage gain of 100. No external scaling resistors are required for

the output. Output voltage is simply defined as:

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.

GND

Figure 1 PCB layout suggestion

Load

ZXCT1021/2