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PDF ZXCT1010 Data sheet ( Hoja de datos )
| Número de pieza | ZXCT1010 | |
| Descripción | ENHANCED HIGH-SIDE CURRENT MONITOR | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ZXCT1010 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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ENHANCED HIGH-SIDE CURRENT MONITOR
ZXCT1010
DESCRIPTION
The ZXCT1010 is a high side current sense monitor.
Using this device eliminates the need to disrupt the
ground plane when sensing a load current.
It is an enhanced version of the ZXCT1009 offering
reduced typical output offset and improved accuracy
at low sense voltage.
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 SOT23-5 package make suitable for portable
battery equipment.
FEATURES
• Low cost, accurate high-side current sensing.
• Output voltage scaling.
• Up to 2.5V sense voltage.
• 2.5V – 20V supply range.
• 300nA typical offset current.
• 4µA quiescent current.
• 1% typical accuracy.
• SOT23 -5 package.
APPLICATIONS
• Battery Chargers
• Smart Battery Packs
• DC Motor control
• Over current monitor
• Power Management
• Level translating
• Programmable current source
APPLICATION CIRCUIT
Vin
Rsense
To Load
Vin
Load
ZXCT1010
GND
Iout
Vout
Rout
ORDERING INFORMATION
PART NUMBER
ZXCT1010E5
PACKAGE PARTMARKING
SOT23-5
1010
ISSUE 4 - DECEMBER 2001
1
1 page  
ZXCT1010
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
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
V in Load
ZXCT1010
GND
I out
Vout
Rout
Rload
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 4 - DECEMBER 2001
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZXCT1010.PDF ] | |
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