ZXCT1021_06 ZETEX [Zetex Semiconductors], ZXCT1021_06 Datasheet - Page 6

• Manufacturer Part Number: ZXCT1021_06
• Description: Low offset high-side current monitor
• Manufacturer: ZETEX [Zetex Semiconductors]

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:
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 7 - June 2006
© Zetex Semiconductors plc 2006
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
ZXCT1021
www.zetex.com
V
IN
Load