Burr-Brown INA198 Current shunt monitor Datasheet

INA193, INA194
INA195, INA196
INA197, INA198
SBOS307B − MAY 2004 − REVISED JUNE 2004
CURRENT SHUNT MONITOR
−16V to 36V Common-Mode Range
FEATURES
DESCRIPTION
D WIDE COMMON-MODE VOLTAGE:
The INA193—INA198 family of current shunt monitors
with voltage output can sense drops across shunts at
common-mode voltages from −16V to +36V, independent
of the INA19x supply voltage. They are available with three
output voltage scales: 20V/V, 50V/V, and 100V/V. The
500kHz bandwidth simplifies use in current control loops.
The INA193—INA195 provide identical functions but
alternative pin configurations to the INA196—INA198
(respectively).
D
D
D
D
D
−16V to 36V
LOW ERROR: 3.0% Over Temp (max)
BANDWIDTH: Up to 500kHz
THREE TRANSFER FUNCTIONS AVAILABLE:
20V/V, 50V/V, and 100V/V
QUIESCENT CURRENT: 900µA (max)
COMPLETE CURRENT SENSE SOLUTION
The INA193—INA198 operate from a single +2.7V to
+13.5V supply, drawing a maximum of 900µA of supply
current. They are specified over the extended operating
temperature range (−40°C to +125°C), and are offered in
a space-saving SOT23 package.
APPLICATIONS
D
D
D
D
D
D
D
WELDING EQUIPMENT
NOTEBOOK COMPUTERS
CELL PHONES
TELECOM EQUIPMENT
AUTOMOTIVE
POWER MANAGEMENT
BATTERY CHARGERS
IS
RS
V IN+
Negative
and
Positive
Common−Mode
Voltage
V+
V IN+
V IN −
5kΩ
Load
5kΩ
A1
A2
OUT =
INA193 −INA198
IS RS R L
5kΩ
RL
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
Copyright  2004, Texas Instruments Incorporated
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SBOS307B − MAY 2004 − REVISED JUNE 2004
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V
Analog Inputs, VIN+, VIN−
Differential (VIN+) − (VIN−) . . . . . . . . . . . . . . . . . . . . . . −2V to +2V
Common-Mode(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . −16V to +36V
Analog Output, Out(2) . . . . . . . . . . . . . GND − 0.3V to (V+) + 0.3V
Input Current Into Any Pin(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
Operating Temperature . . . . . . . . . . . . . . . . . . . . . −55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Lead Temperature (soldering, 10s) . . . . . . . . . . . . . . . . . . . . +300°C
ESD Ratings
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4000V
Charged-Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . 1000V
(1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods
may degrade device reliability. These are stress ratings only, and
functional operation of the device at these or any other conditions
beyond those specified is not supported.
(2) Input voltage at any pin may exceed the voltage shown if the
current at that pin is limited to 5mA.
This integrated circuit can be damaged by ESD. Texas
Instruments recommends that all integrated circuits be
handled with appropriate precautions. Failure to observe
proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to
complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could
cause the device not to meet its published specifications.
ORDERING INFORMATION
PRODUCT
PACKAGE-LEAD
PACKAGE
DESIGNATOR(1)
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
INA193
SOT23-5
DBV
−40°C to +125°C
BJJ
INA194
SOT23-5
DBV
−40°C to +125°C
BJI
INA195
SOT23-5
DBV
−40°C to +125°C
BJK
INA196
SOT23-5
DBV
−40°C to +125°C
BJE
INA197
SOT23-5
DBV
−40°C to +125°C
BJH
INA198
SOT23-5
DBV
−40°C to +125°C
BJL
ORDERING
NUMBER
INA193AIDBVT
Tape and Reel, 250
INA193AIDBVR
Tape and Reel, 3000
INA194AIDBVT
Tape and Reel, 250
INA194AIDBVR
Tape and Reel, 3000
INA195AIDBVT
Tape and Reel, 250
INA195AIDBVR
Tape and Reel, 3000
INA196AIDBVT
Tape and Reel, 250
INA196AIDBVR
Tape and Reel, 3000
INA197AIDBVT
Tape and Reel, 250
INA197AIDBVR
Tape and Reel, 3000
INA198AIDBVT
Tape and Reel, 250
INA198AIDBVR
Tape and Reel, 3000
(1) For the most current specification and package information, refer to our web site at www.ti.com.
PIN ASSIGNMENTS
INA193
INA194
INA195
OUT
1
GND
2
VIN+
3
4
SOT23−5
2
INA196
INA197
INA198
5
V+
VIN−
OUT
1
GND
2
V+
3
TRANSPORT
MEDIA, QUANTITY
SOT23−5
5
VIN−
4
VIN+
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SBOS307B − MAY 2004 − REVISED JUNE 2004
ELECTRICAL CHARACTERISTICS: VS = +12V
Boldface limits apply over the specified temperature range, TA = −40°C to +125°C.
All specifications at TA = +25°C, VS = +12V, VIN+ = 12V, and VSENSE = 100mV, unless otherwise noted.
INA193, INA194, INA195
INA196, INA197, INA198
PARAMETER
INPUT
Full-Scale Input Voltage
Common-Mode Input Range
Common-Mode Rejection
Over Temperature
Offset Voltage, RTI
Over Temperature
vs Temperature
vs Power Supply
Input Bias Current, VIN− pin
OUTPUT
Gain: INA193, INA196
INA194, INA197
INA195, INA198
Gain Error
Over Temperature
Total Output Error(1)
Over Temperature
Nonlinearity Error
Output Impedance
Maximum Capacitive Load
VOLTAGE OUTPUT(2)
TEST CONDITIONS
VSENSE
VCM
CMR
MIN
VSENSE = VIN+ − VIN−
VIN+ = −16V to +36V
VIN+ = +12V to +36V
−16
80
100
VOS
dVOS/dT
PSR
IB
VS = +2.7V to +13.5V, VIN+ = +13.5V
G
VSENSE = 20mV to 100mV, TA = 25°C
VSENSE = 20mV to 100mV
TEMPERATURE RANGE
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Resistance, SOT23
UNIT
0.15
(VS − 0.2)/Gain
36
V
V
dB
dB
mV
mV
µV/°C
µV/V
µA
94
120
±0.5
0.5
2.5
5
+8
±0.75
±1
±0.002
1.5
10
VSENSE = 20mV to 100mV
RO
No Sustained Oscillation
2
3
100
+16
±1
±2
±2.2
±3
±0.1
V/V
V/V
V/V
%
%
%
%
%
Ω
nF
RL = 100kΩ to GND
(V+) − 0.1
(VGND) + 3
BW
tS
CLOAD = 5pF
CLOAD = 5pF
CLOAD = 5pF
CLOAD < 10nF
VSENSE = 10mV to 100mVPP, CLOAD = 5pF
NOISE, RTI
Voltage Noise Density
POWER SUPPLY
Operating Range
Quiescent Current
Over Temperature
MAX
20
50
100
±0.2
Swing to V+ Power Supply Rail
Swing to GND(3)
FREQUENCY RESPONSE
Bandwidth, INA193, INA196
INA194, INA197
INA195, INA198
Phase Margin
Settling Time (1%)
TYP
VS
IQ
kHz
kHz
kHz
degrees
µs
40
nV/√Hz
700
370
−40
−55
−65
qJA
V
mV
500
300
200
40
2
+2.7
VOUT = 2V
VSENSE = 0mV
(V+) − 0.2
(VGND) + 50
200
+13.5
900
950
V
µA
µA
+125
+150
+150
°C
°C
°C
°C/W
(1) Total output error includes effects of gain error and V .
OS
(2) See Typical Characteristics curve Output Swing vs Output Current.
(3) Specified by design.
3
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SBOS307B − MAY 2004 − REVISED JUNE 2004
TYPICAL CHARACTERISTICS
All specifications at TA = +25°C, VS = +12, and VIN+ = 12V, and VSENSE = 100mV, unless otherwise noted.
GAIN vs FREQUENCY
GAIN vs FREQUENCY
45
45
G = 50
35
Gain (dB)
30
G = 100
40
G = 50
35
Gain (dB)
CLOAD = 1000pF
G = 100
40
G = 20
25
20
30
20
15
15
10
10
5
G = 20
25
5
10k
100k
10k
1M
100k
Frequency (Hz)
COMMON−MODE AND POWER−SUPPLY REJECTION
vs FREQUENCY
OUTPUT ERROR vs VSENSE
4.0
140
120
Output Error
(% error of the ideal output value)
Common−Mode and
Power−Supply Rejection (dB)
130
CMR
110
100
90
PSR
80
70
60
50
3.5
3.0
2.5
2.0
1.5
1.0
0.5
40
0
10
100
1k
10k
0
100k
50
100 150
12
11
0.08
10
9
Output Voltage (V )
Output Error (% )
0.1
0.09
0.06
0.05
0.04
0.03
0.02
−16 −12 −8 −4
4
8
12 16 20 24 28 32 36
Common−Mode Voltage (V)
450 500
Sourcing Current
+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 400µA.
3
1
0
0
350 400
VS = 12V
2
0.01
4
250 300
POSITIVE OUTPUT VOLTAGE SWING
vs OUTPUT CURRENT
OUTPUT ERROR vs COMMON−MODE VOLTAGE
0.07
200
VSENSE (mV)
Frequency (Hz)
0
1M
Frequency (Hz)
+125_ C
0
5
10
15
20
Output Current (mA)
25
30
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SBOS307B − MAY 2004 − REVISED JUNE 2004
TYPICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VS = +12, and VIN+ = 12V, and VSENSE = 100mV, unless otherwise noted.
QUIESCENT CURRENT
vs COMMON−MODE VOLTAGE
QUIESCENT CURRENT vs OUTPUT VOLTAGE
875
1000
900
VSENSE = 100mV:
VS = 12V
775
VS = 2.7V
700
675
600
575
IQ (µA)
IQ (µA)
800
500
400
475
VS = 12V
300
375
200
VSENSE = 0mV:
VS = 2.7V
275
100
0
0
1
2
3
4
5
6
7
8
9
10
175
−16 −12 −8 −4
0
4
OUTPUT SHORT−CIRCUIT CURRENT
vs SUPPLY VOLTAGE
12 16
30
G = 20
Output Voltage (50mV/div)
+25_ C
26
20 24 28 32 36
STEP RESPONSE
−40_C
+125_ C
22
18
14
10
VSENSE = 10mV to 20mV
6
2.5 3.5
4.5
5.5 6.5
7.5
8.5
9.5 10.5 11.5 12.5 13.5
Time (2µs/div)
Supply Voltage (V)
STEP RESPONSE
STEP RESPONSE
G = 20
G = 20
Output Voltage (50mV/div)
Output Voltage (500mV/div)
Output Short−Circuit Current (mA)
34
8
VCM (V)
Output Voltage (V)
VSENSE = 10mV to 100mV
Time (2µs/div)
VSENSE = 90mV to 100mV
Time (2µs/div)
5
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SBOS307B − MAY 2004 − REVISED JUNE 2004
TYPICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VS = +12, and VIN+ = 12V, and VSENSE = 100mV, unless otherwise noted.
STEP RESPONSE
STEP RESPONSE
G = 50
Output Voltage (1V/div)
Output Voltage (100mV/div)
G = 50
VSENSE = 10mV to 100mV
VSENSE = 10mV to 20mV
Time (5µs/div)
Time (5µs/div)
STEP RESPONSE
STEP RESPONSE
G = 100
Output Voltage (2V/div)
Output Voltage (100mV/div)
G = 50
VSENSE = 90mV to 100mV
Time (5µs/div)
6
VSENSE = 10mV to 100mV
Time (10µs/div)
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SBOS307B − MAY 2004 − REVISED JUNE 2004
APPLICATIONS INFORMATION
BASIC CONNECTION
Figure 1 shows the basic connection of the INA19x. The
input pins, VIN+ and VIN−, should be connected as closely
as possible 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.
RS
VIN+
−16V to +36V
IS
5kΩ
SELECTING RS
The value chosen for the shunt resistor, RS, depends on
the application and is a compromise between small-signal
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, best performance is
attained with an RS value that provides a full-scale shunt
voltage range of 50mV to 100mV. Maximum input voltage
for accurate measurements is 500mV.
TRANSIENT PROTECTION
+2.7V to +13.5V
VIN+
voltage is up to +36V. The output voltage range of the OUT
terminal, however, is limited by the voltages on the
power-supply pin.
VIN−
Load
V+
5kΩ
OUT
INA193 −INA198
The −16V to +36V common-mode range of the INA19x is
ideal for withstanding automotive fault conditions ranging
from 12V battery reversal up to +36V transients, since no
additional protective components are needed up to those
levels. In the event that the INA19x is exposed to
transients on the inputs in excess of its ratings, then
external transient absorption with semiconductor transient
absorbers (zeners or Transzorbs) will be necessary. Use
of MOVs or VDRs is not recommended except when they
are used in addition to a semiconductor transient absorber.
Select the transient absorber such that it will never allow
the INA19x to be exposed to transients greater than +36V
(that is, allow for transient absorber tolerance, as well as
additional voltage due to transient absorber dynamic
impedance). Despite the use of internal zener-type ESD
protection, the INA19x does not lend itself to using external
resistors in series with the inputs since the internal gain
resistors can vary up to ±30%. (If gain accuracy is not
important, then resistors can be added in series with the
INA19x inputs with two equal resistors on each input.)
OUTPUT VOLTAGE RANGE
Figure 1. INA19x Basic Connection
POWER SUPPLY
The input circuitry of the INA19x can accurately measure
beyond its power-supply voltage, V+. For example, the V+
power supply can be 5V, whereas the load power-supply
The output of the INA19x is accurate within the output
voltage swing range set by the power supply pin, V+. This
is best illustrated when using the INA195 or INA198 (which
are both versions using a gain of 100), where a 100mV
full-scale input from the shunt resistor requires an output
voltage swing of +10V, and a power-supply voltage
sufficient to achieve +10V on the output.
7
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SBOS307B − MAY 2004 − REVISED JUNE 2004
INPUT FILTERING
An obvious and straightforward location for filtering is at
the output of the INA19x series; however, this location
negates the advantage of the low output impedance of the
internal buffer. The only other option for filtering is at the
input pins of the INA19x, which is complicated by the
internal 5kΩ + 30% input impedance; see Figure 2. Using
the lowest possible resistor values minimizes both the
initial shift in gain and effects of tolerance. The effect on
initial gain is given by:
ǒ
GainError% + 100 * 100
Ǔ
5kW
5kW ) RFILT
(1)
Total effect on gain error can be calculated by replacing the
5kΩ term with 5kΩ − 30%, (or 3.5kΩ) or 5kΩ + 30% (or
6.5kΩ). The tolerance extremes of RFILT can also be
inserted into the equation. If a pair of 100Ω 1% resistors
are used on the inputs, the initial gain error will be 1.96%.
Worst-case tolerance conditions will always occur at the
lower excursion of the internal 5kΩ resistor (3.5kΩ), and
the higher excursion of RFILT − 3% in this case.
Note that the specified accuracy of the INA19x must then
be combined in addition to these tolerances. While this
discussion treated accuracy worst-case conditions by
combining the extremes of the resistor values, it is
appropriate to use geometric mean or root sum square
calculations to total the effects of accuracy variations.
RSHUNT << RFILTER
LOAD
VSUPPLY
RFILTER < 100
RFILTER < 100
CFILTER
f−3dB
f−3dB =
1
2π (2 RFILTER) CFILTER
+5V
VIN+
5kΩ
VIN−
V+
5kΩ
OUT
INA193 −INA198
Figure 2. Input Filter (Gain Error − 1.5% to −2.2%)
8
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INSIDE THE INA19x
The INA19x uses a new, unique internal circuit topology
that provides common-mode range extending from −16V
to +36V while operating from a single power supply. The
common-mode rejection in a classic instrumentation amp
approach is limited by the requirement for accurate
resistor matching. By converting the induced input
voltage to a current, the INA19x provides common-mode
rejection that is no longer a function of closely matched
resistor values, providing the enhanced performance
necessary for such a wide common-mode range. A
simplified diagram (see Figure 3) shows the basic circuit
function. When the common-mode voltage is positive,
amplifier A2 is active.
The differential input voltage, (VIN+) − (VIN−) applied
across RS, is converted to a current through a 5kΩ
resistor. This current is converted back to a voltage
through RL, and then amplified by the output buffer
amplifier. When the common-mode voltage is negative,
amplifier A1 is active. The differential input voltage, (VIN+)
− (VIN−) applied across RS, is converted to a current
through a 5kΩ resistor. This current is sourced from a
precision current mirror whose output is directed into RL
converting the signal back into a voltage and amplified by
the output buffer amplifier. Patent-pending circuit
architecture ensures smooth device operation, even
during the transition period where both amplifiers A1 and
A2 are active.
IS
RS
VIN+
Negative
and
Positive
Common−Mode
Voltage
V+
VIN+
VIN−
5kΩ
Load
5kΩ
A1
A2
OUT =
INA193 −INA198
ISRSRL
5kΩ
RL
Figure 3. INA19x Simplified Circuit Diagram
9
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SBOS307B − MAY 2004 − REVISED JUNE 2004
RSHUNT
LOAD
+12V
I1
+5V
VIN+
5kΩ
VIN−
V+
5kΩ
V+
OUT
for
+12V
Common−Mode
INA193 −INA198
5kΩ
5kΩ
GND
OUT
for
−12V
Common−Mode
INA193 −INA198
VIN+
VIN− GND
RSHUNT
−12V
LOAD
I2
Figure 4. Monitor Bipolar Output Power-Supply Current
10
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SBOS307B − MAY 2004 − REVISED JUNE 2004
RSHUNT
LOAD
VSUPPLY
+5V
VIN+
5kΩ
VIN−
+5V
VIN+
V+
5kΩ
VIN−
5kΩ
V+
5kΩ
+5V
INA152
40kΩ
OUT
INA193 −INA198
40kΩ
OUT
VOUT
INA193 −INA198
40kΩ
40kΩ
+2.5V
VREF
Figure 5. Bi-directional Current Monitoring
Up to +36V
RSHUNT
Solenoid
VIN+
5kΩ
+2.7V to +13.5V
VIN−
V+
5kΩ
OUT
INA193 −INA198
Figure 6. Inductive Current Monitor Including Flyback
11
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SBOS307B − MAY 2004 − REVISED JUNE 2004
VIN+
VIN−
5kΩ
V+
5kΩ
For output
signals > comparator trip−point.
R1
OUT
TLV3012
INA193 −INA198
R2
1.25V
Internal
Reference
(a) INA19x output adjusted by voltage divider.
VIN+
VIN−
5kΩ
REF
V+
5kΩ
OUT
TLV3012
INA193 −INA198
R1
(b) Comparator reference voltage adjusted by voltage divider.
R2
For use with
small output signals.
Figure 7. INA19x With Comparator
12
REF
1.25V
Internal
Reference
PACKAGE OPTION ADDENDUM
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9-Dec-2004
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
INA193AIDBVR
ACTIVE
SOT-23
DBV
5
3000
None
CU NIPDAU
Level-3-260C-168 HR
INA193AIDBVT
ACTIVE
SOT-23
DBV
5
250
None
CU NIPDAU
Level-3-260C-168 HR
INA194AIDBVR
ACTIVE
SOT-23
DBV
5
3000
None
CU
Level-3-260C-168 HR
INA194AIDBVT
ACTIVE
SOT-23
DBV
5
250
None
CU
Level-3-260C-168 HR
INA195AIDBVR
ACTIVE
SOT-23
DBV
5
3000
None
CU
Level-3-260C-168 HR
Lead/Ball Finish
MSL Peak Temp (3)
INA195AIDBVT
ACTIVE
SOT-23
DBV
5
250
None
CU
Level-3-260C-168 HR
INA196AIDBVR
ACTIVE
SOT-23
DBV
5
3000
None
CU NIPDAU
Level-3-260C-168 HR
INA196AIDBVT
ACTIVE
SOT-23
DBV
5
250
None
CU NIPDAU
Level-3-260C-168 HR
INA197AIDBVR
ACTIVE
SOT-23
DBV
5
3000
None
CU NIPDAU
Level-3-260C-168 HR
INA197AIDBVT
ACTIVE
SOT-23
DBV
5
250
None
CU NIPDAU
Level-3-260C-168 HR
INA198AIDBVR
ACTIVE
SOT-23
DBV
5
3000
None
CU NIPDAU
Level-3-260C-168 HR
INA198AIDBVT
ACTIVE
SOT-23
DBV
5
250
None
CU NIPDAU
Level-3-260C-168 HR
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional
product content details.
None: Not yet available Lead (Pb-Free).
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,
including bromine (Br) or antimony (Sb) above 0.1% of total product weight.
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
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