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ZXCT1011 датащи(PDF) 5 Page - Zetex Semiconductors

номер детали ZXCT1011
подробное описание детали  High-side low drift current monitor
PDF  8 Pages
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производитель  ZETEX [Zetex Semiconductors]
домашняя страница  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

ZXCT1011 датащи(HTML) 5 Page - Zetex Semiconductors

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ZXCT1011
Issue 1- July 2005
5
www.zetex.com
© Zetex Semiconductors plc 2005
Pin description
Application information
Design example
The following lines describe how to scale a load current to an output voltage.
Vsense = (Vsense+) - (Vsense-) = Iload x Rsense
Defining then
Iout = Iq + Vsense x gm
since
gm= 1.2 / Rshunt
Iout
= Iq + [ (Vsense x 1.2) / Rshunt ]
= Iq + [ (1.2 x Iload x Rsense / Rshunt) ]
Note: Iq is embedded into the specification of the ZXCT1011 and therefore appears an offset error.
∴V
out = (Rout x Ioffset) + [(1.2 x Rout x Iload x Rsense) / Rshunt]
The output current of the ZXCT1011 is directly related to the size of the trimming resistor used. It
is important to ensure the tolerance of Rshunt is considered. A 1% change in Rshunt will cause a
1% change in output.
Consider the following: -
Pin no.
Pin name
Pin function
1
N/C
No connection
2Iout
Output current - follows transconductance of sense voltage gm = 10mA/V
for Rshunt=120
3Rshunt
Trimming resistor Input. - used to trim gain value 60
Rshunt
240
4Vsense-
Low side current sense input. – connect to load/battery etc. Must be
lower than Vsense+ for correct operation. Cannot be grounded
without additional series resistor.
5Vsense+
High side current sense input. – Connect to supply rail. Must be
higher than Vsense+ for correct operation.



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