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PDF ZXCT1109Q Data sheet ( Hoja de datos )

Número de pieza ZXCT1109Q
Descripción AUTOMOTIVE COMPLIANT MICROPOWER CURRENT MONITOR
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ZXCT1107Q, ZXCT1109Q, ZXCT1110Q
AUTOMOTIVE COMPLIANT MICROPOWER CURRENT MONITOR
Description
The ZXCT1107Q/09Q/10Q products 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 and SOT25 packages, make them suitable for a
range of automotive applications.
The device is line powered and as such doesn’t need a separate supply
rail.
Quiescent current is only 3µA, thereby minimizing current sensing error.
One external gain setting resistor increases versatility by permitting
wide gain ranges.
The ZXCT1107Q/09Q/10Q devices have been qualified to AEC-Q100
Grade 1 and are Automotive Compliant supporting PPAPs.
Pin Assignments
ZXCT1107Q
Top View
2 S-
OUT 1
3 S+
ZXCT1109Q
Top View
2 S+
OUT 1
3 S-
Features
Wide Supply and Common-Mode Voltage Range:
2.5V to 36V
SOT23 and SOT25 Packages
3-Pin ZXCT1107Q/09Q
5-Pin ZXCT1110Q
ZXCT1110Q
Top View
NC 1
5 S-
GND 2
OUT 3
4 S+
Low Quiescent Current (3µA).
Extended Industrial Temperature Range -40 to +125°C
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Qualified to AEC-Q100 Standards for High Reliability
PPAP Capable (Note 4)
Applications
Automotive Current Measurement
Battery Management
Over Current Monitor
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
4. Automotive products are AEC-Q100 qualified and are PPAP capable. Refer to http://www.diodes.com/quality/product_compliance_definitions/.
Typical Application Circuit
VSUPPLY
RSENSE
VSUPPLY
RSENSE
ZXCT1107
or
ZXCT1109
S+ S-
OUT
OUTPUT
LOAD
GND
RGAIN
ZXCT1107Q/ 1109Q/ 1110Q
Document number: DS37002 Rev. 2 - 2
ZXCT1110 S+
GND
S-
OUT
OUTPUT
LOAD
GND
RGAIN
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December 2015
© Diodes Incorporated

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ZXCT1109Q pdf
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
2500
2000
VS+ = 20V
VOUT = 0V
1500
1000
TA = 125°C
TA = 85°C
TA =25°C
TA = 0°C
TA = -40°C
500
0
0 100 200 300 400 500 600
VSENSE (mV)
Output Current vs. VSENSE
ZXCT1107Q, ZXCT1109Q, ZXCT1110Q
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
450
400
350
300
250
200
150
100
50
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
ZXCT1107Q/ 1109Q/ 1110Q
Document number: DS37002 Rev. 2 - 2
5 of 18
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December 2015
© Diodes Incorporated

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ZXCT1109Q arduino
ZXCT1107Q, ZXCT1109Q, ZXCT1110Q
Application Information (Continued)
Calculation of Resistor Values (Continued)
Then
or
  3.28 * 10 4 VSENSE * 0.0072
VSENSE * 0.004
  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
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: ZXCT1107Q/ZXCT1109Q Error
VSENSE
Mean IOUT
10mV
45.5µA
30mV
124.5µA
100mV
408µA
200mV
809.5µA
Error Band
±8.5µA
±9.5µA
±14µA
±22.5µA
Percent Error
±18.7%
±7.6%
±3.4%
±2.8%
Table 2: ZXCT1110Q Error
VSENSE
Mean IOUT
10mV
40µA
30mV
120µA
100mV
400µA
200mV
800µA
Error Band
±4µA
±5.44µA
±10.48µA
±17.68µA
Percent Error
±10%
±4.53%
±2.62%
±2.21%
Note that in order to avoid additional error, VSUPPLY must be at least 1.5V greater than VOUT. This margin depends on the value of VSENSE. For
VSENSE = 100mV, this margin can be reduced to 1.0V.
RSENSE is chosen based on the threshold VSENSET of sense voltage selected as above, for the chosen threshold load current, ILOADT.
RSENSE
VSENSET
ILOADT
Equation 4
RGAIN is chosen to give the required threshold output voltage, VOUTT. From Equation 1, the threshold output current is:
IOUTT = 0.004 * VSENSET
RGAIN
VOUT T
IOUT T
or
RGAIN
VOUT T
0.004 * VSENSET
Equation 1a
Equation 5
ZXCT1107Q/ 1109Q/ 1110Q
Document number: DS37002 Rev. 2 - 2
11 of 18
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December 2015
© Diodes Incorporated

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