zxct1012 Zetex Semiconductors plc., zxct1012 Datasheet - Page 6

• Manufacturer Part Number: zxct1012
• Description: Zxct1012 - Reduced Height Micro-power Current Monitor
• Manufacturer: Zetex Semiconductors plc.

The following lines describe how to scale a load current to an output voltage.
V
I
V
Design example
In the circuit below a 1A current is to be represented by a 100mV output voltage (V
A) To be within recommended values choose the value of R
50mV > V
For example set V
From equation (1)
B) Now choose R
V
From equation (2)
Rearranging equation (3) for R
Typical circuit application
Where R
requires monitoring, Rsense can be selected on specific requirements of accuracy, size and power
rating.
Issue 1 - December 2006
© Zetex Semiconductors plc 2006
OUT
SENSE
OUT
OUT
IN
= 0.1 / (0.1 x 0.01) = 100
R
I
R
OUT
SENSE
OUT
= 100mV, when V
SENSE+
LOAD
GND
ZXCT1012
SENSE
= V
= R
= 10mA/V x V
= I
OUT
SENSE
represents any load including DC motors, a charging battery or further circuitry that
OUT
SENSE
SENSE-
> 200mV at full load.
OUT
/I
SENSE
OUT
x R
OUT
OUT
* I
OUT
to give:
SENSE
LOAD
= 100mV at 1.0A.
SENSE
OUT
= 100mV.
= 0.1V/1.0A
= 10mA/V x 0.1
= 0.1/0.001
OUT
gives:
equation (1)
equation (2)
equation (3)
LOAD
6
= 0.1
= 1mA
= 100
SENSE
to give:
ZXCT1012
www.zetex.com
OUT
):