zxct1022 Zetex Semiconductors plc., zxct1022 Datasheet - Page 6

• Manufacturer Part Number: zxct1022
• Description: Zxct1022 - Low Offset High-side Current Monitor
• Manufacturer: Zetex Semiconductors plc.

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:
Where V
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
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.
Issue 6 - March 2008
© Zetex Semiconductors plc 2008
V
OUT
SENSE
= 100 x V
= V
IN
- V
SENSE
LOAD
(V)
using 1 oz copper. Smaller resistances can be used if
6
Figure 1 PCB layout suggestion
GND
ZXCT1021/2
V
OUT
ZXCT1022
www.zetex.com
V
IN
Load