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INA200, INA201, INA202
SBOS374E – NOVEMBER 2006 – REVISED SEPTEMBER 2017
INA20x High-Side Measurement Current-Shunt Monitor
With Open-Drain Comparator and Reference
1 Features
3 Description
•
•
The INA200, INA201, and INA202 devices are highside current-shunt monitors with voltage output and
integrated comparator. The INA20x devices can
sense drops across shunts at common-mode
voltages from –16 V to 80 V. The INA20x series is
available with three output voltage scales: 20 V/V, 50
V/V, and 100 V/V, with a bandwidth up to 500-kHz.
1
•
•
•
•
•
•
•
•
Complete Current Sense Solution
Three Gain Options Available:
– INA200 = 20 V/V
– INA201 = 50 V/V
– INA202 = 100 V/V
0.6-V Internal Voltage Reference
Internal Open-Drain Comparator
Latching Capability on Comparator
Common-Mode Range: –16 V to 80 V
High Accuracy: 3.5% Maximum Error Over
Temperature
Bandwidth: 500 kHz (INA200)
Quiescent Current: 1800 μA (Maximum)
Packages: SOIC-8, VSSOP-8
The INA200, INA201, and INA202 devices
incorporate an open-drain comparator and internal
reference providing a 0.6-V threshold. External
dividers set the current trip point. The comparator
includes a latching capability, that can be made
transparent by grounding (or leaving open) the
RESET pin.
The INA200, INA201, and INA202 devices operate
from a single 2.7-V to 18-V supply, drawing a
maximum of 1800 μA of supply current. Package
options include the very small VSSOP-8 and the
SOIC-8. All versions are specified over the extended
operating temperature range of –40°C to +125°C.
2 Applications
•
•
•
•
•
•
•
Notebook Computers
Cell Phones
Telecom Equipment
Automotive
Power Management
Battery Chargers
Welding Equipment
Device Information(1)
PART NUMBER
INA200
INA201
INA202
PACKAGE
BODY SIZE (NOM)
SOIC (8)
4.90 mm × 3.91 mm
VSSOP (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
1
INA200 (G = 20)
INA201 (G = 50)
INA202 (G = 100)
VS
2 OUT
G
VIN+
8
VIN-
7
0.6-V
Reference
3 CMPIN
Comparator
4
CMPOUT 6
GND
RESET 5
Copyright © 2017, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
INA200, INA201, INA202
SBOS374E – NOVEMBER 2006 – REVISED SEPTEMBER 2017
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
4
4
4
4
5
7
7
9
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics: Current-Shunt Monitor .....
Electrical Characteristics: Comparator......................
Electrical Characteristics: General ............................
Typical Characteristics ..............................................
Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 13
7.4 Device Functional Modes........................................ 19
8
Application and Implementation ........................ 22
8.1 Application Information............................................ 22
8.2 Typical Application ................................................. 22
9
Power Supply Recommendations...................... 23
9.1 Output vs Supply Ramp Considerations ................. 23
10 Layout................................................................... 25
10.1 Layout Guidelines ................................................. 25
10.2 Layout Example .................................................... 25
11 Device and Documentation Support ................. 26
11.1
11.2
11.3
11.4
11.5
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
26
26
26
26
26
12 Mechanical, Packaging, and Orderable
Information ........................................................... 26
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (October 2015) to Revision E
Page
•
Reformatted Thermal Information table note ......................................................................................................................... 4
•
Corrected typo in Voltage Output section in Electrical Characteristics table ......................................................................... 6
•
Added text to Comparator subsection in Feature Description section ................................................................................. 14
•
Added Figure 31 to Feature Description section .................................................................................................................. 18
•
Added Output vs Supply Ramp Considerations subsection in Feature Description section................................................ 23
•
Added Figure 36, Figure 37, and Figure 38 ......................................................................................................................... 23
Changes from Revision C (October 2010) to Revision D
•
Page
Added ESD Ratings table, Thermal Information table, Feature Description section, Device Functional Modes,
Application and Implementation section, Power Supply Recommendations section, Layout section, Device and
Documentation Support section, and Mechanical, Packaging, and Orderable Information section ..................................... 4
Changes from Revision B (October, 2007) to Revision C
Page
•
Revised front-page figure ....................................................................................................................................................... 1
•
Changed title of data sheet..................................................................................................................................................... 1
•
Updated document format to current standards..................................................................................................................... 1
2
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SBOS374E – NOVEMBER 2006 – REVISED SEPTEMBER 2017
5 Pin Configuration and Functions
DGK and D Packages
8-Pin VSSOP and SOIC
Top View
VS
1
8
VIN+
OUT
2
7
VIN-
CMPIN
3
6
CMPOUT
GND
4
5
RESET
Pin Functions
PIN
I/O
DESCRIPTION
NAME
NO.
CMPIN
3
Analog input
CMPOUT
6
Analog
output
Comparator output
GND
4
Analog
Ground
OUT
2
Analog
output
Output voltage
RESET
5
Analog input
Comparator reset pin, active low
VIN–
7
Analog input
Connect to shunt low side
VIN+
8
Analog input
Connect to shunt high side
VS
1
Analog
Comparator input
Power supply
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SBOS374E – NOVEMBER 2006 – REVISED SEPTEMBER 2017
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
MIN
MAX
UNIT
2.7
18
V
Differential (VIN+) – (VIN–)
–18
18
V
Common-mode (2)
–16
80
V
Comparator analog input and reset pins (2)
GND – 0.3
(Vs) + 0.3
V
(2)
GND – 0.3
(Vs) + 0.3
V
GND – 0.3
18
V
5
mA
Supply voltage, Vs
Current-shunt monitor
analog inputs, VIN+, VIN–
Analog output, OUT
Comparator output, OUT (2)
Input current into any pin (2)
Operating temperature
–55
150
°C
Junction temperature
–65
150
°C
Storage temperature, Tstg
–65
150
°C
(1)
(2)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
This voltage may exceed the ratings shown if the current at that pin is limited to 5 mA.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins (1)
±4000
Charged device model (CDM), per JEDEC specification JESD22-C101, all
pins (2)
±1000
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
NOM
MAX
–16
12
80
Operating supply voltage
2.7
12
18
V
Operating free-air temperature
–40
25
125
°C
VCM
Common-mode input voltage
VS
TA
UNIT
V
6.4 Thermal Information
INA20x
THERMAL METRIC (1)
D (SOIC)
DGK (SOIC)
8 PINS
8 PINS
UNIT
RθJA
Junction-to-ambient thermal resistance
110.5
162.2
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
50.4
37.7
°C/W
RθJB
Junction-to-board thermal resistance
52.7
82.9
°C/W
ψJT
Junction-to-top characterization parameter
7.8
1.3
°C/W
ψJB
Junction-to-board characterization parameter
51.9
81.4
°C/W
(1)
4
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
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SBOS374E – NOVEMBER 2006 – REVISED SEPTEMBER 2017
6.5 Electrical Characteristics: Current-Shunt Monitor
at TA = 25°C, VS = 12 V, VCM = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, RPULL-UP = 5.1 kΩ connected from CMPOUT to VS,
and CMPIN = GND, (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
0.15
(VS – 0.25) / Gain
UNIT
INPUT
VSENSE
Full-scale sense input voltage
VSENSE = VIN+ – VIN–
VCM
Common-mode input range
TA = –40°C to 125°C
–16
VIN+ = –16 V to 80 V
80
CMR
Common-mode rejection
VIN+ = 12 V to 80 V, TA = –40°C to 125°C
100
TA = 25°C
Offset voltage, RTI (1)
VOS
80
100
V
dB
123
±0.5
V
dB
±2.5
mV
TA = 25°C to 125°C
±3
mV
TA = –40°C to 25°C
±3.5
mV
dVOS/dT
Offset voltage, RTI, vs
temperature
TMIN to TMAX, TA = –40°C to 125°C
PSR
Offset voltage, RTI, vs power
supply
VOUT = 2 V, VIN+ = 18 V, 2.7 V, TA = –40°C to
125°C
2.5
100
μV/V
IB
Input bias current, VIN– pin
TA = –40°C to 125°C
±9
±16
μA
(1)
5
μV/°C
Offset is extrapolated from measurements of the output at 20-mV and 100-mV VSENSE.
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Electrical Characteristics: Current-Shunt Monitor (continued)
at TA = 25°C, VS = 12 V, VCM = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, RPULL-UP = 5.1 kΩ connected from CMPOUT to VS,
and CMPIN = GND, (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OUTPUT (VSENSE ≥ 20 mV)
G
Gain
INA200
20
V/V
INA201
50
V/V
INA202
100
VSENSE = 20 mV to 100 mV
Gain error
±0.2%
VSENSE = 20 mV to 100 mV, TA = –40°C to
125°C
±2%
VSENSE = 120 mV, VS = 16 V
RO
Total output error (2)
VSENSE = 120 mV, VS = 16 V, TA = –40°C to
125°C
Nonlinearity error (3)
VSENSE = 20 mV to 100 mV
±0.75%
±2.2%
±3.5%
±0.002%
Output impedance
Maximum capacitive load
V/V
±1%
No sustained oscillation
1.5
Ω
10
nF
300
mV
OUTPUT (VSENSE < 20 mV) (4)
Output
VOLTAGE OUTPUT
INA200, INA201,
INA202
–16 V ≤ VCM < 0 V
INA200
0 V ≤ VCM ≤ VS, VS =
5V
0.4
V
INA201
0 V ≤ VCM ≤ VS, VS =
5V
1
V
INA202
0 V ≤ VCM ≤ VS, VS =
5V
2
V
INA200, INA201,
INA202
VS < VCM ≤ 80 V
300
mV
(5)
Output swing to the positive rail
VIN– = 11 V, VIN+ = 12 V, TA = –40°C to 125°C
(Vs) – 0.15
(Vs) – 0.25
V
Output swing to GND (6)
VIN– = 0 V, VIN+ = –0.5 V, TA = –40°C to 125°C
(GND) + 0.004
(GND) + 0.05
V
FREQUENCY RESPONSE
BW
Bandwidth
Phase margin
SR
INA200
CLOAD = 5 pF
500
kHz
INA201
CLOAD = 5 pF
300
kHz
INA202
CLOAD = 5 pF
200
kHz
CLOAD < 10 nF
Slew rate
Settling time (1%)
VSENSE = 10 mVPP to 100 mVPP,
CLOAD = 5 pF
40
°C
1
V/μs
2
μs
40
nV/√Hz
NOISE, RTI
Voltage noise density
(2)
(3)
(4)
(5)
(6)
6
Total output error includes effects of gain error and VOS.
Linearity is best fit to a straight line.
For details on this region of operation, see Accuracy Variations section in Device Functional Modes.
See Figure 8.
Specified by design.
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6.6 Electrical Characteristics: Comparator
at TA = 25°C, VS = 12 V, VCM = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, and RPULL-UP = 5.1 kΩ connected from CMPOUT to
VS, (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
TA = 25°C
590
608
620
mV
TA = –40°C to 125°C
586
625
mV
OFFSET VOLTAGE
Threshold
Hysteresis (1)
TA = –40°C to 85°C
–8
mV
INPUT BIAS CURRENT (2)
Input bias current, CMPin PIN
0.005
Input bias current, CMPin PIN, vs temperature
TA = –40°C to 125°C
10
nA
15
nA
INPUT VOLTAGE RANGE
Input voltage range, CMPin PIN
0 V to VS – 1.5 V
V
OUTPUT (OPEN-DRAIN)
Large-signal differential voltage gain
CMP VOUT 1 V to 4 V,
RL ≥ 15 kΩ connected to 5 V
ILKG
High-level leakage current (3) (4)
VID = 0.4 V, VOH = VS
0.0001
1
μA
VOL
Low-level output voltage (3)
VID = –0.6 V, IOL = 2.35 mA
220
300
mV
RL to 5 V, CL = 15 pF, 100-mV Input
Step with 5-mV overdrive
1.3
200
V/mV
RESPONSE TIME
Response time (5)
μs
RESET
RESET threshold (6)
1.1
Logic input impedance
Minimum RESET pulse width
RESET propagation delay
(1)
(2)
(3)
(4)
(5)
(6)
V
2
MΩ
1.5
μs
3
μs
Hysteresis refers to the threshold (the threshold specification applies to a rising edge of a noninverting input) of a falling edge on the
noninverting input of the comparator; refer to Figure 1.
Specified by design.
VID refers to the differential voltage at the comparator inputs.
Open-drain output can be pulled to the range of 2.7 to 18 V, regardless of VS.
The comparator response time specified is the interval between the input step function and the instant when the output crosses 1.4 V.
The RESET input has an internal 2 MΩ (typical) pull-down. Leaving RESET open results in a LOW state, with transparent comparator
operation.
6.7 Electrical Characteristics: General
at TA = 25°C, VS = 12 V, VCM = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, RPULL-UP = 5.1 kΩ connected from CMPOUT to VS,
and CMPIN = 1 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
18
V
1350
1800
μA
1850
μA
POWER SUPPLY
VS
IQ
Operating power supply
Quiescent current
TA = –40°C to 125°C
2.7
VOUT = 2 V
VSENSE = 0 mV, TA = –40°C to 125°C
Comparator power-on reset
threshold (1)
1.5
V
TEMPERATURE
θJA
(1)
Specified temperature
–40
125
°C
Operating temperature
–55
150
°C
Storage temperature
–65
150
Thermal resistance
°C
VSSOP-8 Surface-Mount
200
°C/W
SOIC-8
150
°C/W
The INA200, INA201, and INA202 are designed to power-up with the comparator in a defined reset state as long as RESET is open or
grounded. The comparator is in reset as long as the power supply is below the voltage shown here. The comparator assumes a state
based on the comparator input above this supply voltage. If RESET is high at power-up, the comparator output comes up high and
requires a reset to assume a low state, if appropriate.
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VTHRESHOLD
0.592V 0.6V
Input Voltage
Hysteresis = VTHRESHOLD - 8mV
Figure 1. Typical Comparator Hysteresis
8
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6.8 Typical Characteristics
at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV, (unless otherwise noted)
45
G = 50
35
30
Gain (dB)
30
G = 100
40
G = 50
35
Gain (dB)
45
CLOAD = 1000pF
G = 100
40
G = 20
25
20
G = 20
25
20
15
15
10
10
5
5
10k
100k
10k
1M
100k
Frequency (Hz)
Figure 2. Gain vs Frequency
Figure 3. Gain vs Frequency
20
140
18
130
Common-Mode and
Power-Supply Rejection (dB)
100V/V
16
14
VOUT (V)
1M
Frequency (Hz)
50V/V
12
10
8
20V/V
6
4
120
CMR
110
100
90
PSR
80
70
60
50
2
40
0
100
20
200
300
400
500
600
700
800
900
10
100
1k
VDIFFERENTIAL (mV)
100k
Frequency (Hz)
Figure 4. Gain Plot
Figure 5. Common-Mode and Power-Supply Rejection vs
Frequency
4.0
0.1
3.5
0.09
0.08
3.0
Output Error (% )
Output Error
(% error of the ideal output value)
10k
2.5
2.0
1.5
1.0
0.07
0.06
0.05
0.04
0.03
0.02
0.5
0.01
0
0
50
100 150
200
250 300
350 400 450 500
0
-16 -12 -8 -4
VSENSE (mV)
0
4
8
12 16 20
...
76 80
Common-Mode Voltage (V)
Figure 6. Output Error vs VSENSE
Figure 7. Output Error vs Common-Mode Voltage
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Typical Characteristics (continued)
at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV, (unless otherwise noted)
3.5
12
11
VS = 12V
10
2.5
+25°C
8
-40°C
+125°C
7
6
VS = 3V
5
Sourcing Current
+25°C
4
-40°C
Output stage is designed
to source current. Current
sinking capability is
approximately 400mA.
3
2
1
+125°C
0
0
IQ (mA)
Output Voltage (V)
3.0
Sourcing Current
9
2.0
1.5
1.0
0.5
0
5
10
20
15
25
30
0
2
1
Output Current (mA)
IQ (mA)
1.50
1.25
VS = 12V
1.00
VS = 2.7V
VSENSE = 0mV
7
6
8
0.75
10
-40°C
30
+25°C
26
+125°C
22
18
14
10
6
0
4
8
12 16 20 24 28 32 36
2.5 3.5
4.5
VCM (V)
5.5 6.5
7.5
8.5
9.5 10.5 11.5 17
18
Supply Voltage (V)
Figure 10. Quiescent Current vs Common-Mode Voltage
Figure 11. Output Short-Circuit Current vs Supply Voltage
G = 20
Output Voltage (50mV/div)
Output Voltage (500mV/div)
G = 20
VSENSE = 20mV to 30mV
VSENSE = 20mV to 110mV
Time (2ms/div)
Time (2ms/div)
Figure 12. Step Response
10
9
Figure 9. Quiescent Current vs Output Voltage
Output Short-Circuit Current (mA)
VS = 2.7V
VS = 12V
0.50
-16 -12 -8 -4
5
34
VSENSE = 100mV
1.75
4
Output Voltage (V)
Figure 8. Positive Output Voltage Swing vs Output Current
2.00
3
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Figure 13. Step Response
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Typical Characteristics (continued)
at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV, (unless otherwise noted)
G = 50
Output Voltage (50mV/div)
Output Voltage (100mV/div)
G = 20
VSENSE = 90mV to 100mV
VSENSE = 20mV to 30mV
Time (2ms/div)
Time (5ms/div)
Figure 14. Step Response
Figure 15. Step Response
G = 50
Output Voltage (1V/div)
Output Voltage (100mV/div)
G = 50
VSENSE = 90mV to 100mV
VSENSE = 20mV to 110mV
Time (5ms/div)
Time (5ms/div)
Figure 16. Step Response
Figure 17. Step Response
600
G = 100
Output Voltage (2V/div)
500
VOL (mV)
400
300
200
100
0
VSENSE = 20mV to 110mV
0
1
2
3
4
5
6
ISINK (mA)
Time (10ms/div)
Figure 18. Step Response
Figure 19. Comparator VOL vs ISINK
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Typical Characteristics (continued)
at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV, (unless otherwise noted)
600
602
Comparator Trip Point (mV)
599
Reset Voltage (mV)
598
597
596
595
594
593
592
601
600
599
598
597
591
596
590
2
4
6
8
10
12
14
16
18
-50
0
-25
Supply Voltage (V)
Figure 20. Comparator Trip Point vs Supply Voltage
50
75
100
125
Figure 21. Comparator Trip Point vs Temperature
200
1.2
175
1.0
Reset Voltage (V)
Propagation Delay (ns)
25
Temperature (°C)
150
125
100
75
0.8
0.6
0.4
0.2
50
0
0
20
40
60
80
100 120 140
160 180
2
200
4
Overdrive Voltage (mV)
6
8
10
12
14
16
18
Supply Voltage (V)
Figure 22. Comparator Propagation Delay vs Overdrive
Voltage
Figure 23. Comparator Reset Voltage vs Supply Voltage
300
Propagation Delay (ns)
275
Input
200mV/div
250
225
200
175
Output
2V/div
150
125
-50
-25
0
25
50
75
100
125
VOD = 5mV
2ms/div
Temperature (°C)
Figure 24. Comparator Propagation Delay vs Temperature
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Figure 25. Comparator Propagation Delay
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7 Detailed Description
7.1 Overview
The INA200, INA201, and INA202 devices are high-side current-shunt monitors with voltage output. The INA20x
devices can sense drops across shunts at common-mode voltages from –16 V to 80 V. The INA200–INA202
devices are available with three output voltage scales: 20 V/V, 50 V/V, and 100 V/V, with up to 500-kHz
bandwidth. The INA200, INA201, and INA202 devices incorporate an open-drain comparator and internal
reference providing a 0.6-V threshold. External dividers set the current trip point. The comparator includes a
latching capability, that can be made transparent by grounding (or leaving open) the RESET pin. The INA200,
INA201, and INA202 devices operate from a single 2.7 to 18-V supply, drawing a maximum of 1800 μA of supply
current. Package options include the very small MSOP-8 and the SO-8. All versions are specified over the
extended operating temperature range of –40°C to +125°C.
7.2 Functional Block Diagram
VS
VIN+
OUT
G
VIN-
0.6-V
Reference
CMPIN
Comparator
GND
CMPOUT
RESET
7.3 Feature Description
7.3.1 Basic Connections
Figure 26 shows the basic connections of the INA20x devices. The input pins (VIN+ and VIN–) must be connected
as closely as possible with Kelvin connections to the shunt resistor to minimize any resistance in series with the
shunt resistance.
Power-supply bypass capacitors are required for stability. Applications with noisy or high-impedance power
supplies may require additional decoupling capacitors to reject power-supply noise. Connect bypass capacitors
close to the device pins.
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Product Folder Links: INA200 INA201 INA202
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INA200, INA201, INA202
SBOS374E – NOVEMBER 2006 – REVISED SEPTEMBER 2017
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RSHUNT
3m
Load Supply
-18 V to 80 V
Load
5-V Supply
INA200
(G = 20)
1
VS
2 OUT
CBYPASS 0.01 µF
G
R1
VIN+
8
VIN-
7
CMPOUT
6
RPULLUP
4.7 k
0.6-V
Reference
3 CMPIN
Comparator
R2
4 GND
RESET 5
Transparent / Reset
SW
Latch
Copyright © 2017, Texas Instruments Incorporated
Figure 26. INA200 Basic Connections
7.3.2 Selecting RS
The selected value for the shunt resistor, RS, depends on the application and is a compromise between smallsignal accuracy and maximum permissible voltage loss in the measurement line. High values of RS provide better
accuracy at lower currents by minimizing the effects of offset, while low values of RS minimize voltage loss in the
supply line. For most applications, using an RS value that provides a full-scale shunt voltage range of 50 mV to
100 mV results in the best performance. Maximum input voltage for accurate measurements is 500 mV, but
output voltage is limited by supply.
7.3.3 Comparator
The INA200, INA201, and INA202 devices incorporate an open-drain comparator. This comparator typically has
2 mV of offset and a 1.3-μs (typical) response time. The output of the comparator latches and is reset through
the RESET pin; see Figure 28.
When Vs and RESET are different, TI recommends adding a low-pass filter (LPF) on the RESET pin to avoid
comparator behavior inconsistent with the data sheet. For instance, with a 12-V supply and a 3.3-V RESET, a
rise time of 400 ns is appropriate. Similarly, with an 18-V supply and a 2.7-V RESET, a 1-µs rise time is
appropriate; see Figure 31.
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Product Folder Links: INA200 INA201 INA202
INA200, INA201, INA202
www.ti.com
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