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PDF ZXCT1009 Data sheet ( Hoja de datos )
| Número de pieza | ZXCT1009 | |
| Descripción | HIGH-SIDE CURRENT MONITOR | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ZXCT1009 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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HIGH-SIDE CURRENT MONITOR
ZXCT1009
DESCRIPTION
The ZXCT1009 is a high side current sense monitor.
Using this device eliminates the need to disrupt the
ground plane when sensing a load current.
It takes a high side 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.
APPLICATIONS
• Battery Chargers
• Smart Battery Packs
• DC Motor control
• Over current monitor
• Power Management
• Level translating
• Programmable current source
The wide input voltage range of 20V down to as low as
2.5V make it suitable for a range of applications. A
minimum operating current of just 4µA, combined
with its SOT23 package make it a unique solution,
suitable for portable battery equipment.
APPLICATION CIRCUIT
Vin Rsense
To Load
FEATURES
• Low cost, accurate high-side current sensing.
• Output voltage scaling.
• Up to 2.5V sense voltage.
• 2.5V – 20V supply range.
• 4µA quiescent current.
• 1% typical accuracy.
• SOT23 & SM8† packages.
ZXCT
1009
Vout
Rout
† 8 leaded SOT223
ISSUE 3 - APRIL 2001
ORDERING INFORMATION
PART NUMBER
ZXCT1009F
ZXCT1009T8
PACKAGE PARTMARKING
SOT23
109
SM8
ZXCT1009
SM8 due for release May 2001
Sampling April 2001
1
1 page  
ZXCT1009
POWER DISSIPATION
The maximum allowable power dissipation of the
device for normal operation (Pmax), is a function of
the package junction to ambient thermal resistance
(θja), maximum junction temperature (Tjmax), and
ambient temperature (Tamb), according to the
expression:
Pmax = (Tjmax – Tamb) / θja
The device power dissipation, PD is given by the
expression:
PD=Iout.(Vin-Vout) Watts
SM8
SOT23
APPLICATIONS INFORMATION
The following lines describe how to scale a load
current to an output voltage.
Vsense = Vin - Vload
Vout = 0.01 x Vsense x Rout1
E.g.
A 1A current is to be represented by a 100mV output
voltage:
1)Choose the value of Rsense to give 50mV > Vsense >
500mV at full load.
For example Vsense = 100mV at 1.0A. Rsense = 0.1/1.0
=> 0.1 ohms.
2)Choose Rout to give Vout = 100mV, when Vsense =
100mV.
Rearranging 1 for Rout gives:
Rout = Vout /(Vsense x 0.01)
Rout = 0.1 / (0.1 x 0.01) = 100 Ω
TYPICAL CIRCUIT APPLICATION
Vin Rsense
ZXCT1009
Vin Load
Iout
Rload
Vout
Rout
Where Rload represents any load including DC motors,
a charging battery or further circuitry that requires
monitoring, Rsense can be selected on specific
requirements of accuracy, size and power rating.
ISSUE 3 - APRIL 2001
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZXCT1009.PDF ] | |
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