INA169NA/3KG4 [TI]
2.7V 至 60V、440kHz 可变增益电流感应放大器 | DBV | 5 | -40 to 125;
| 型号： | INA169NA/3KG4 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 2.7V 至 60V、440kHz 可变增益电流感应放大器 | DBV | 5 | -40 to 125 放大器 光电二极管 运算放大器 放大器电路 |
| 文件： | 总11页 (文件大小：200K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INA139
INA169
SBOS181C – DECEMBER 2000 – REVISED JULY 2004
High-Side Measurement
CURRENT SHUNT MONITOR
DESCRIPTION
FEATURES
ꢀ COMPLETE UNIPOLAR HIGH-SIDE
CURRENT MEASUREMENT CIRCUIT
ꢀ WIDE SUPPLY AND COMMON-MODE RANGE
ꢀ INA139: 2.7V to 40V
The INA139 and INA169 are high-side, unipolar, current
shunt monitors. Wide input common-mode voltage range,
high-speed, low quiescent current, and tiny SOT23 packag-
ing enable use in a variety of applications.
ꢀ INA169: 2.7V to 60V
ꢀ INDEPENDENT SUPPLY AND INPUT COMMON-
MODE VOLTAGES
ꢀ SINGLE RESISTOR GAIN SET
ꢀ LOW QUIESCENT CURRENT (60µA typ)
ꢀ SOT23-5 PACKAGE
Input common-mode and power-supply voltages are inde-
pendent and can range from 2.7V to 40V for the INA139 and
2.7V to 60V for the INA169. Quiescent current is only 60µA,
which permits connecting the power supply to either side of
the current measurement shunt with minimal error.
The device converts a differential input voltage to a current
output. This current is converted back to a voltage with an
external load resistor that sets any gain from 1 to over 100.
Although designed for current shunt measurement, the cir-
cuit invites creative applications in measurement and level
shifting.
APPLICATIONS
ꢀ CURRENT SHUNT MEASUREMENT:
Automotive, Telephone, Computers
ꢀ PORTABLE AND BATTERY-BACKUP
SYSTEMS
Both the INA139 and INA169 are available in SOT23-5
packages and are specified for the –40°C to +85°C industrial
temperature range.
ꢀ BATTERY CHARGERS
ꢀ POWER MANAGEMENT
ꢀ CELL PHONES
ꢀ PRECISION CURRENT SOURCE
IS
RS
VIN+
Up to 60V
3
4
VIN+
VIN–
Load
1kΩ
1kΩ
V+
5
OUT
1
VO = ISRSRL/1kΩ
GND
2
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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2000-2004, Texas Instruments Incorporated
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
PACKAGE/ORDERING INFORMATION(1)
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESIGNATOR
PACKAGE
MARKING
ORDERING
NUMBER
TRANSPORT
MEDIA, QUANTITY
PRODUCT
PACKAGE-LEAD
INA139
SOT23-5 Surface-Mount
DBV
"
–40°C to +85°C
E39
"
INA139NA/250
INA139NA/3K
INA169NA/250
INA169NA/3K
Tape and Reel, 250
Tape and Reel, 3000
Tape and Reel, 250
Tape and Reel, 3000
"
INA169
"
"
"
SOT23-5 Surface-Mount
DBV
–40°C to +85°C
A69
"
"
"
"
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet.
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
Supply Voltage, V+
INA139 ............................................................................... –0.3V to 60V
INA169 ............................................................................... –0.3V to 75V
Analog Inputs, VIN+, VIN–
INA139
Common Mode ............................................................... –0.3V to 60V
Differential (VIN+) – (VIN–) .................................................. –40V to 2V
INA169
ESD damage can range from subtle performance degrada-
tion 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.
Common Mode ............................................................... –0.3V to 75V
Differential (VIN+) – (VIN–) .................................................. –40V to 2V
Analog Output, Out .............................................................. –0.3V to 40V
Operating Temperature ..................................................–55°C to +125°C
Storage Temperature .....................................................–65°C to +125°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTE: (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 implied.
PIN CONFIGURATION
Top View
SOT
OUT
GND
VI+N
1
2
3
5
4
V+
VI–N
INA139, INA169
2
SBOS181C
www.ti.com
ELECTRICAL CHARACTERISTICS
At TA = –40°C to +85°C, VS = 5V, VIN+ = 12V, and ROUT = 25kΩ, unless otherwise noted.
INA139NA
TYP
INA169NA
TYP
PARAMETER
CONDITION
MIN
MAX
MIN
MAX
UNITS
INPUT
Full-Scale Sense Voltage
Common-Mode Input Range
Common-Mode Rejection
V
SENSE = (VIN+) – (VIN–
)
100
115
500
40
ꢀ
ꢀ
60
mV
V
dB
dB
mV
µV/°C
µV/V
µV/V
uA
2.7
100
ꢀ
VIN+ = 2.7V to 40V, VSENSE = 50mV
VIN+ = 2.7V to 60V, VSENSE = 50mV
100
120
ꢀ
ꢀ
Offset Voltage(1) RTI
vs Temperature
vs Power Supply, V+
±0.2
1
0.5
±1
ꢀ
TMIN to TMAX
V– = 2.7V to 40V, VSENSE = 50mV
V– = 2.7V to 60V, VSENSE = 50mV
10
0.1
ꢀ
10
Input Bias Current
10
OUTPUT
Transconductance
vs Temperature
Nonlinearity Error
Total Output Error
Output Impedance
Voltage Output
V
SENSE = 10mV – 150mV
SENSE = 100mV
SENSE = 10mV to 150mV
990
1000
10
±0.01
±0.5
1 || 5
1010
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
µA/V
nA/°C
%
V
V
±0.1
±2
ꢀ
ꢀ
V
SENSE = 100mV
%
GΩ || pF
Swing to Power Supply, V+
Swing to Common Mode, VCM
(V+) – 0.9 (V+) – 1.2
VCM – 0.6 VCM – 1.0
ꢀ
ꢀ
ꢀ
ꢀ
V
V
FREQUENCY RESPONSE
Bandwidth
ROUT = 10kΩ
ROUT = 20kΩ
5V Step, ROUT = 10kΩ
5V Step, ROUT = 20kΩ
440
220
2.5
5.0
ꢀ
ꢀ
ꢀ
ꢀ
kHz
kHz
µs
Settling Time (0.1%)
µs
NOISE
Output-Current Noise Density
Total Output-Current Noise
20
7
ꢀ
ꢀ
pA/√Hz
nA RMS
BW = 100kHz
POWER SUPPLY
Operating Range, V+
Quiescent Current
2.7
40
125
ꢀ
60
ꢀ
V
µA
VSENSE = 0, IO = 0
60
ꢀ
ꢀ
TEMPERATURE RANGE
Specification, TMIN to TMAX
Operating
Storage
Thermal Resistance
–40
–55
–65
85
125
150
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
°C
°C
°C
θJA
200
°C/W
ꢀ Specification same as for the INA139NA.
NOTE: (1) Defined as the amount of input voltage, VSENSE, to drive the output to zero.
INA139, INA169
3
SBOS181C
www.ti.com
TYPICAL CHARACTERISTICS
At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 25kΩ, unless otherwise noted.
COMMON-MODE REJECTION vs FREQUENCY
GAIN vs FREQUENCY
40
120
100
80
60
40
20
0
RL = 100kΩ
G = 100
30
RL = 10kΩ
20
G = 10
G = 1
10
RL = 1kΩ
0
–10
–20
100
1k
10k
100k
1M
10M
100k
70
0.1
1
10
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
POWER-SUPPLY REJECTION vs FREQUENCY
TOTAL OUTPUT ERROR vs VIN
VIN = (VIN+ − VIN−
140
120
100
80
5
0
)
–55°C
G = 100
G = 10
+150°C
–5
+25°C
G = 1
60
–10
–15
40
20
1
10
100
1k
10k
25
50
75
VIN (mV)
100
125
150
0
200
Frequency (Hz)
TOTAL OUTPUT ERROR
vs POWER-SUPPLY VOLTAGE
QUIESCENT CURRENT
vs POWER-SUPPLY VOLTAGE
2
1
100
80
60
40
20
0
Output error is essentially
independent of both
V+ supply voltage and
input common-mode voltage.
+150°
+125°
+25°
G = 1
0
–55°
G = 10
G = 25
–1
–2
Use the INA169 with
(V+) > 40V
10
20
30
40
50
60
10
20
50
0
0
30
40
60
70
Power-Supply Voltage (V)
Power-Supply Voltage (V)
INA139, INA169
4
SBOS181C
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 25kΩ, unless otherwise noted.
STEP RESPONSE
STEP RESPONSE
1V
1.5V
G = 50
0V
G = 100
0.5V
2V
G = 10
0V
1V
G = 100
0V
10µs/div
20µs/div
The transfer function for the INA139 is:
OPERATION
IO = gm (VIN+) – (VIN–
)
(1)
(2)
Figure 1 shows the basic circuit diagram for both the INA139
and the INA169. Load current, IS, is drawn from the supply,
VS, through the shunt resistor, RS. The voltage drop in the
shunt resistor, VS, is forced across RG1 by the internal op
amp, causing current to flow into the collector of Q1. The
external resistor, RL, converts the output current to a voltage,
where gm = 1000µA/V
In the circuit of Figure 1, the input voltage, (VIN+) – (VIN–), is
equal to IS • RS and the output voltage, VOUT, is equal to
IO • RL. The transconductance, gm, of the INA139 is
1000µA/V. The complete transfer function for the current
measurement amplifier in this application is:
VOUT, at the OUT pin.
VOUT = (IS) (RS) (1000µA/V) (RL)
(3)
VP
Load Power Supply
+2.7V to 40V(1)
Shunt
RS
IS
VIN+
VIN–
V+ power can be
common or
indepedent of
3
4
Load
V+
load supply.
RG1
1kΩ
RG2
1kΩ
2.7V ≤ (V+) ≤ 40V(1)
5
Q1
OUT
1
INA139
VOLTAGE GAIN
EXACT RL (Ω)
NEAREST 1% RL (Ω)
+
VO
–
2
IO
1
2
1k
2k
1k
2k
RL
5
5k
4.99k
10k
20k
49k
100k
10
20
50
100
10k
20k
50k
100k
NOTE: (1) Maximum VP and V+ voltage is 60V with the INA169.
FIGURE 1. Basic Circuit Connections.
INA139, INA169
5
SBOS181C
www.ti.com
The maximum differential input voltage for accurate mea-
surements is 0.5V, which produces a 500µA output current.
A differential input voltage of up to 2V will not cause damage.
Differential measurements (pins 3 and 4) must be unipolar
with a more-positive voltage applied to pin 3. If a more-
negative voltage is applied to pin 3, the output current (IO) is
zero, but will not cause damage.
IS
3
4
INA139
ZIN
OPA340
BASIC CONNECTION
RL
Buffer of amp drives the A/D converter
without affecting gain.
Figure 1 shows the basic connection of the INA139. The
input pins, VIN+ and VIN– , must be connected as closely as
possible to the shunt resistor to minimize any resistance in
series with the shunt resistance. The output resistor, RL, is
shown connected between pin 1 and ground. Best accuracy
is achieved with the output voltage measured directly across
RL. This is especially important in high-current systems
where load current can flow in the ground connections,
affecting the measurement accuracy.
FIGURE 2. Buffering Output to Drive the A/D Converter.
OUTPUT VOLTAGE RANGE
The output of the INA139 is a current that is converted to a
voltage by the load resistor, RL. The output current remains
accurate within the compliance voltage range of the output
circuitry. The shunt voltage and the input common-mode and
power-supply voltages limit the maximum possible output
swing. The maximum output voltage compliance is limited by
the lower of the two equations below:
No power-supply bypass capacitors are required for stability
of the INA139. However, applications with noisy or high-
impedance power supplies can require decoupling capaci-
tors to reject power-supply noise; connect the bypass capaci-
tors close to the device pins.
VOUT MAX = (V+) – 0.7V – (VIN+ – VIN–
or
)
(4)
POWER SUPPLIES
VOUT MAX = (VIN–) – 0.5V
(whichever is lower)
(5)
The input circuitry of the INA139 can accurately measure
beyond its power-supply voltage, V+. For example, the V+
power supply can be 5V whereas the load power-supply
voltage is up to +36V (or +60V with the INA169). However,
the output voltage range of the OUT terminal (pin 1) is limited
by the lesser of the two voltages (see the Output Voltage
Range section).
BANDWIDTH
Measurement bandwidth is affected by the value of the load
resistor, RL. High gain produced by high values of RL will
yield a narrower measurement bandwidth (see the Typical
Characteristics). For widest possible bandwidth, keep the
capacitive load on the output to a minimum.
SELECTING RS AND RL
If bandwidth limiting (filtering) is desired, a capacitor can be
added to the output, as shown in Figure 3, which will not
cause instability.
The value chosen for the shunt resistor, RS, depends on the
application and is a compromise between small-signal accu-
racy and maximum permissible voltage loss in the measure-
ment line. High values of RS provide better accuracy at lower
currents by minimizing the effects of offset, whereas 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 of 50mV to 100mV;
maximum input voltage for accurate measurements is 500mV.
3
4
f–3dB
1
f–3dB
=
INA139
2πRLCL
RL is chosen to provide the desired full-scale output voltage.
The output impedance of the INA139 OUT terminal is very
high, which permits using values of RL up to 100kΩ with
excellent accuracy. The input impedance of any additional
circuitry at the output must be much higher than the value of
RL to avoid degrading accuracy.
VO
CL
RL
FIGURE 3. Output Filter.
Some Analog-to-Digital (A/D) converters have input imped-
ances that will significantly affect measurement gain. The input
impedance of the A/D converter can be included as part of the
effective RL if its input can be modeled as a resistor to ground.
Alternatively, an op amp can be used to buffer the A/D
converter input, as shown in Figure 2, see Figure 1 for
recommended values of RL.
APPLICATIONS
The INA139 is designed for current shunt measurement
circuits (see Figure 1), but its basic function is useful in a
wide range of circuitry. A creative engineer will find many
unforeseen uses in measurement and level shifting circuits.
A few ideas are illustrated in Figures 4 through 7.
INA139, INA169
6
SBOS181C
www.ti.com
3
3
4
4
V+
VR
REF200
100µA
INA139
INA139
R1
R2
VO
VO
1
1
RL
Gain Set by R1 R2
Gain Set by RL
Output Offset = (100µA)(RL)
(VR)R2
Output Offset =
(independent of V+)
R1 + R2
a) Using resistor divider.
b) Using current source.
FIGURE 4. Offsetting the Output Voltage.
±1A
1Ω
Charger
4
3
4
3
+
48V
+5V
Load
+5V
1kΩ
1kΩ
1kΩ
1kΩ
5
5
INA169
INA169
2
2
1
1
1N4148
Comparator
SIGN
1N4148
10KΩ
10KΩ
0V to 1V
VO
100KΩ
FIGURE 5. Bipolar Current Measurement.
INA139, INA169
7
SBOS181C
www.ti.com
RS
V+
4
3
4
3
+5V
+5V
+5V
REFOUT BUFIN
BUFOUT
5
5
REF
BUF
Digital
I/O
INA139
INA139
12-Bit
A/D
2
2
1
1
MUX
PGIA
Converter
R
25kΩ
L
R
25kΩ
L
Clock
Divider
Oscillator
Serial
I/O
ADS7870
The A/D converter is programmed for differential input.
Depending on the polarity of the current, one INA139 provides
an output voltage whereas the other’s output is zero.
FIGURE 6. Bipolar Current Measurement Using a Differential Input of the A/D Converter.
Other INA169s
Digital I/O on the ADS7870 provides power to
select the desired INA169. Diodes prevent
output current of an “on” INA169 from flowing
into an “off” INA169.
INA169
V+
+5V
––
REFOUT BUFIN
BUFOUT
REF
BUF
Digital
I/O
INA169
V+
––
12-Bit
A/D
MUX
PGIA
Converter
1N4148
Clock
Divider
Oscillator
Serial
I/O
RL
ADS7870
FIGURE 7. Multiplexed Measurement Using Logic Signal for Power.
INA139, INA169
8
SBOS181C
www.ti.com
PACKAGE OPTION ADDENDUM
www.ti.com
15-Jul-2004
PACKAGING INFORMATION
ORDERABLE DEVICE
STATUS(1)
PACKAGE TYPE
PACKAGE DRAWING
PINS
PACKAGE QTY
INA139NA/250
INA139NA/3K
INA169NA/250
INA169NA/3K
ACTIVE
ACTIVE
ACTIVE
ACTIVE
SOP
SOP
SOP
SOP
DBV
DBV
DBV
DBV
5
5
5
5
250
3000
250
3000
(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.
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
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相关型号：
INA170EA/250G4
60-V, High-Side, Bi-Directional, High-Speed, Current Output Current Shunt Monitor 8-VSSOP -40 to 85
TI
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