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PDF ZXCT1020 Data sheet ( Hoja de datos )
| Número de pieza | ZXCT1020 | |
| Descripción | Low offset current output current monitor | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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ZXCT1020
ZXCT1020
Low offset current output current monitor
Description
The ZXCT1020 is a precision high-side current
sense monitor. Using this type of device
eliminates the need to disrupt the ground
plane when sensing a load current.
The ZXCT1020 uses two external resistors to
set the overall voltage gain for applications
where improved accuracy at small sense
voltages is required. For fixed gain variants
Zetex offers the ZXCT1021 (G=10) and
ZXCT1022 (G=100).
The ZXCT1020 footprint follows that of the
ZXCT1021/2 with only 2 additional resistors
required:
One resistor between pins 1 and 4 for setting
transconductance, and the other between
pins 3 and 2 for setting overall gain.
Features
• Accurate high-side current sensing
• Versatile current output scaling
• 2.5V - 20V operating range
• 25µA quiescent current
• 1% typical accuracy
• SOT23-5 package
Pinout information
Current output enables the user to set the gain
via these external resistors. Using two external
resistors to set the gain ensures optimal
versatility as the transconductance can be varied
to meet the output impedance requirements of
the load that the ZXCT1020 has to drive.
The very low offset voltage enables a typical
accuracy of 3% for sense voltages of only 10mV,
giving better tolerances for small sense
resistors necessary at higher currents.
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 25µA, combined with its SOT23-5
package make it suitable for portable battery
equipment too.
Applications
• Battery chargers
• Over-current monitor
• Motherboard power supply current measurement
• Level translating
• Programmable current source
Typical application circuit
S+ 1
5 S-
GND 2
OUT 3
4 VB
Top view
RSH
S+ 1
VOUT
RG
3
RS IL
VB
S-
(LOAD)
45
-
+
2 ZXCT1020
GND
Ordering information
Order reference
Package
ZXCT1020E5TA
SOT23-5
Device
marking
1020
Status
Preview
Reel size
(inches)
7
Quantity
per reel
3000
Tape width
(mm)
8
Issue 1 - August 2007
© Zetex Semiconductors plc 2007
1
www.zetex.com
1 page  
www.DataSheet4U.com
ZXCT1020
Test conditions unless otherwise stated: TA = 25°C, VB = VSENSE+ (via RSH) =15V, VSENSE = 100mV
Gain = 10, RG = 15k⍀.
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Issue 1 - August 2007
© Zetex Semiconductors plc 2007
5
www.zetex.com
5 Page 
www.DataSheet4U.com
ZXCT1020
Application information
The ZXCT1020 has a VB pin that is used to provide power to the current monitor. The maximum
voltage applied to the ZXCT1020 must be applied to this pin. The S+ and S- pins are used to
measure the current flowing to the load through the sense resistor. In normal use, the S+ is tied
to VB via a shunt resistor, RH making the ZXCT1020 essentially line powered.
The ZXCT1020 has a programmable gain set by the ratio of two external resistors RG and RSH.
RSH
S+ 1
VOUT
RG
3
RS IL
VB
S-
(LOAD)
45
-
+
2 ZXCT1020
GND
RSH sets the transconductance whereas RG set the gain and results in an output voltage defined
as:
VOUT
=
--R----G----
RSH
×
VSENSE
Where VSENSE = RSENSE x IL
The ZXCT1020 has been tested to the same conditions as the ZXCT1021 giving an overall voltage
gain of 10. The gain of the ZXCT1020 can be adjusted simply by varying RG. So to achieve a gain
of 50 RG is increased from 15k⍀ to 75k⍀. An alternative is to decrease RSH from 1.5k⍀ to 300⍀.
Decreasing RSH increases the transconductance and, if for any given gain, reducing the RSH will
reduce the overall output impedance.
To achieve a gain of 100, for example, the following resistor values could be used:
RSH = 150 RG = 15k
Issue 1 - August 2007
© Zetex Semiconductors plc 2007
11
www.zetex.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ZXCT1020.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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