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PDF ZXCT1011 Data sheet ( Hoja de datos )
| Número de pieza | ZXCT1011 | |
| Descripción | High-side low drift current monitor | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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ZXCT1011
High-side low drift current monitor
Description
The ZXCT1011 is a high side current sense monitor. Using this type of device eliminates the need
to disrupt the ground plane when sensing a load current.
The ZXCT1011 takes the voltage developed across a current shunt resistor and translates it into a
proportional output current.
A user defined output resistor scales the output current into a ground referenced voltage.
A current reference resistor, external to the IC, results in an improved temperature coefficient
compared to the ZXCT1009.
The wide input voltage range of 20V down to as low as 2.5V make it suitable for a range of
applications. With a minimum operating current of just 4uA, combined with its SOT23-5 package
make it suitable for portable battery equipment too.
Features
Applications
■ Accurate high-side current sensing
■ 2.5V to 20V supply range
■ 4 µA quiescent current
■ 1% typical accuracy
■ Package SOT23-5
■ Temperature range -40 to 125°C
■ Automotive current measurement
■ Battery management
■ DC motor and solenoid control
■ Over current monitor
■ Power management
Typical application circuit
Pin connections
Vin
Rsense
Load
Rshunt
120 Ω
5
Vsense+
4
Vsense-
3 ZXCT1011
I out
2
V
Rout
N/C
Iout
Rshunt
Vsense+
Vsense-
GND
Ordering information
Order code
Pack
ZXCT1011E5TA SOT23-5
Part
mark
1011
Reel Size
inches (mm)
7 (180)
Tape width
8mm
Quantity Per
reel
3,000
Issue 1- July 2005
© Zetex Semiconductors plc 2005
1
www.zetex.com
1 page  
ZXCT1011
Pin description
Pin no.
1
2
Pin name
N/C
Iout
3 Rshunt
4 Vsense-
5 Vsense+
Pin function
No connection
Output current - follows transconductance of sense voltage gm = 10mA/V
for Rshunt=120⍀
Trimming resistor Input. - used to trim gain value 60⍀ Յ Rshunt Յ 240⍀
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.
High side current sense input. – Connect to supply rail. Must be
higher than Vsense+ for correct operation.
Application information
Design example
The following lines describe how to scale a load current to an output voltage.
Defining then
since
Vsense = (Vsense+) - (Vsense-) = Iload x Rsense
Iout = Iq + Vsense x gm
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.
∴Vout = (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: -
Issue 1- July 2005
© Zetex Semiconductors plc 2005
5
www.zetex.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZXCT1011.PDF ] | |
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