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PDF ZXCT1109 Data sheet ( Hoja de datos )
| Número de pieza | ZXCT1109 | |
| Descripción | LOW POWER HIGH-SIDE CURRENT MONITORS | |
| Fabricantes | Diodes | |
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A Product Line of
Diodes Incorporated
ZXCT1107/1109/1110
LOW POWER HIGH-SIDE CURRENT MONITORS
Description
The ZXCT1107/09/10 are high side unipolar current sense
monitors. These devices eliminate the need to disrupt the
ground plane when sensing a load current.
The wide common-mode input voltage range and low
quiescent current coupled with SOT23 packages make
them suitable for a range of applications; including
adapters, automotive and systems operating from industrial
24V rails.
The device is line powered and as such doesn’t need a
separate supply rail.
Quiescent current is only 3µA thereby minimising current
sensing error. One external gain setting resistor increases
versatility by permitting wide gain ranges.
Features
• Wide supply and common-mode voltage range:
2.5V to 36V
• SOT23 packages
o 3-pin ZXCT1107/09
o 5-pin ZXCT1110
• Low quiescent current (3µA).
• Extended industrial temperature range -40 to 125°C
• AEC-Q100 Grade1 Automotive qualified variants
Applications
• Automotive current measurement
• Industrial applications current measurement
• Battery management
• Over current monitor
• Power Management
Typical Application Circuit
Pin Assignments
ZXCT1107
Top View
2 S-
OUT 1
3 S+
ZXCT1109
Top View
2 S+
OUT 1
3 S-
ZXCT1110
Top View
NC 1
5 S-
GND 2
OUT 3
4 S+
ZXCT1107/1109/1110
Document number: DS35033 Rev. 3 - 2
1 of 16
www.diodes.com
JULY 2011
© Diodes Incorporated
1 page  
A Product Line of
Diodes Incorporated
ZXCT1107/1109/1110
LOW POWER HIGH-SIDE CURRENT MONITORS
Typical Characteristics
12
VOUT = 0V
VSENSE = 0V
10
TA = 125°C
8
6 TA = 85°C
4 TA = 25°C
2
TA = 0°C
TA = -40°C
0
0 10 20 30 40
VS+ (V)
Input Current vs. VS+
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
TA = 25°C
VOUT = 0V
VSENSE = 0V
10 20 30
VS+ (V)
IS+ Current vs. VS+
40
9.0
VSENSE = 0V
8.0 VOUT = 0V
7.0
6.0
VS+ = 20V
5.0
4.0 VS+ = 3.7V
3.0
2.0
1.0
0.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Input Current vs. Ambient Temperature
1.8
TA = 25°C
1.6 VOUT = 0V
VSENSE = 0V
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
10 20 30
VS+ (V)
IS- Current vs. VS+
40
2500
2000
VS+ = 20V
VOUT = 0V
1500
1000
TA = 125°C
TA = 85°C
TA =25°C
TA = 0°C
TA = -40°C
450
400
350
300
250
200
150
500 100
50
0
0 100 200 300 400 500
VSENSE (mV)
Output Current vs. VSENSE
ZXCT1107/1109/1110
Document number: DS35033 Rev. 3 - 2
600
5 of 16
www.diodes.com
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT VOLTAGE (V)
Output Current vs. Output Voltage
JULY 2011
© Diodes Incorporated
5 Page 
A Product Line of
Diodes Incorporated
ZXCT1107/1109/1110
LOW POWER HIGH-SIDE CURRENT MONITORS
Application Information (cont.)
The ZXCT1110 is highly linear and has a transconductance of 4mA/V ±1.8% and an output of 40µA ±4µA at VSENSE=10mV.
The output current can therefore be calculated (Standard International Units) as:
IOUT = (40 +/-4)*10-6 + (VSENSE-0.01)*(0.004 +/- 0.000072) Amp
The worst-case current error is then
IOUTERROR = IOUT – IOUTIDEAL = +/- { 4*10-6 + (VSENSE-0.01) * 0.000072 } Amp
or IOUTERROR = +/- { 3.28*10-6 + VSENSE * 0.000072 } A
The percentage error is
ε = IOUTERROR *100% = IOUTERROR *100%
IOUTIDEAL
VSENSE * 0.004
Then
ε = ± 3.28 * 10−4 + VSENSE * 0.0072 %
VSENSE * 0.004
or ε = ± 0.082 ± 1.8%
VSENSE
Equation 2
This shows that the error is reduced with increasing VSENSE. Then the minimum VSENSE required to give the error ±ε % is
VSENSE
=
0.082
ε − 1.8
V
[only for ZXCT1110]
Equation 3
In the application, the effect of the external resistor tolerances must also be taken into account.
Table 1: ZXCT1107/ZXCT1109 Error
VSENSE
10mV
30mV
100mV
200mV
Mean IOUT
45.5 µA
124.5 µA
408 µA
809.5 µA
Table 2: ZXCT1110 Error
VSENSE
10mV
30mV
100mV
200mV
Mean IOUT
40µA
120µA
400µA
800µA
Error Band
±8.5µA
±9.5µA
±14µA
±22.5µA
Percent Error
±18.7%
±7.6%
±3.4%
±2.8%
Error Band
±4µA
±5.44µA
±10.48µA
±17.68µA
Percent Error
±10%
±4.53%
±2.62%
±2.21%
ZXCT1107/1109/1110
Document number: DS35033 Rev. 3 - 2
11 of 16
www.diodes.com
JULY 2011
© Diodes Incorporated
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ZXCT1109.PDF ] | |
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