TP199A1T-CR [3PEAK]
Zero-Drift, Bi-directional Current Sense Amplifier;
| 型号： | TP199A1T-CR |
| 厂家： | 
3PEAK |
| 描述： | Zero-Drift, Bi-directional Current Sense Amplifier |
| 文件： | 总9页 (文件大小：779K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TP199A1T/2T
Zero-Drift, Bi-directional Current Sense Amplifier
Features
Description
VOLTAGE OFFSET: ±100uV (MAX)
The TP199 series of zero-drift, bi-directional current sense
amplifier can sense voltage drops across shunts at
common-mode voltages from –0.3V to 36V, independent of the
supply voltage. Two fixed gains are available: 50V/V, and
100V/V. The low offset of the zero-drift architecture enables
current sensing with maximum drops across the shunt as low
as 10mV full-scale.
WIDE COMMON MODE VOLTAGE:-0.3V to +36V
SUPPLY VOLTAGE: 2.7V to +36V
ACCURACY and ZERO-DRIFT PERFORMANCE
±1% Gain Error (Max over temperature)
0.5μV/°C Offset Drift (Max)
10ppm/°C Gain Drift (Max)
TWO GAIN OPTIONS for VOLTAGE OUTPUT
TP199 devices operate from a single +2.7V to 36V power
supply, with drawing a typical of 120uA of supply current. All
versions are specified from –40°C +125°C, and offered in
SC70-6 packages.
TP199A1T: 50V/V
TP199A2T: 100V/V
LOW SUPPLY CURRENT: 120uA (TYP)
Rail-to-Rail Output
PACKAGE: SC70-6
GAIN OPTIONS TABLE
Industrial –40°C to 125°C Operation Range
ESD Rating: Robust 3KV – HBM, 2KV – CDM
Higher performance Drop-In Compatible With
INA213, INA214, INA199, NCS199 Products
PRODUCT
GAIN
R3 and R4
R1 and R2
TP199A1T
TP199A2T
50
20kΩ
10kΩ
1MΩ
1MΩ
100
Applications
(
)
푉푂푈푇 = 퐼퐿푂퐴퐷 × 푅푆퐻푈푁푇 퐺ꢀ퐼ꢁ + 푉ꢂ퐸퐹
CURRENT SENSING (High−Side/Low−Side)
BATTERY CHARGERS
POWER MANAGEMENT
CELL PHONE CHARGER
ELECTRICAL CIGIRATE
WIRELESS CHARGER
TELECOM EQUIPMENT
Application schematic
Pin Configuration
Reference
voltage
TP199
RSHUNT
Supply
Load
6-Pin SC70
(-C Suffix)
Output
REF
OUT
REF
1
2
3
6
OUT
IN-
R1
R3
IN-
GND
GND
V+
5
4
-
+
IN+
IN+
+2.7V to +36V
V+
R2
R4
CBYPASS
0.01µF
to 0.1µF
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Rev.A.1
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TP199A1T/2T
Zero-Drift, Bi-directional Current Sense Amplifier
Order Information
Model Name
Order Number
Gain
50V/V
100V/V
Package
Transport Media, Quantity
Package Marking
TP199A1T-CR
TP199A2T-CR
6-Pin SC70
6-Pin SC70
Tape and Reel, 3,000
Tape and Reel, 3,000
9A1
9A2
TP199
Note 1
Absolute Maximum Ratings
Supply Voltage:…………………...........................42.0V
Input Voltage.....................................GND– 0.3 to 42V
Input Current: +IN, –IN Note 3...............................±5mA
Output Current: OUT...................................... ±35mA
Current at Supply Pins……………............... ±60mA
Operating Temperature Range........–40°C to 125°C
Maximum Junction Temperature................... 150°C
Storage Temperature Range.......... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ......... 260°C
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to
any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The op amp supplies must be established simultaneously, with, or before, the application of any input signals.
Note 3: The inputs are protected by ESD protection diodes to each power supply. If the input extends more than 500mV beyond the
power supply, the input current should be limited to less than 10mA.
Note 4: A heat sink may be required to keep the junction temperature below the absolute maximum. This depends on the power
supply voltage and how many amplifiers are shorted. Thermal resistance varies with the amount of PC board metal connected to the
package. The specified values are for short traces connected to the leads.
ESD, Electrostatic Discharge Protection
Symbol
HBM
Parameter
Condition
Minimum Level
Unit
kV
Human Body Model ESD
Charged Device Model ESD
MIL-STD-883H Method 3015.8
JEDEC-EIA/JESD22-C101E
±3
±2
CDM
kV
Thermal Resistance
Package Type
θJA
θJC
Unit
6-Pin SC70
227
80
°C/W
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Rev.A.1
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TP199A1T/2T
Zero-Drift, Bi-directional Current Sense Amplifier
Electrical Characteristics
The specifications are at TA = 25°C, VSENSE = VIN+ – VIN–, VS = 5 V, VIN+ = 12V, and VREF = VS / 2, unless otherwise noted
Symbol
INPUT
Parameter
Conditions
Min
Typ
Max
Unit
VOS
VOS TC
VCM
Input Offset Voltage
VSENSE = 0 mV
±5
±100
0.5
uV
μV/°C
V
Input Offset Voltage Drift
Common-mode Input Range
Common Mode Rejection Ratio
Input Bias Current
VSENSE = 0 mV, -40°C to 125°C
-40°C to 125°C
0.1
-0.3
95
36
CMRR
IB
VIN+ = 5~26 V, VSENSE = 0 mV, -40°C to 125°C
VSENSE = 0 mV
120
35
dB
uA
IOS
Input Offset Current
VSENSE = 0 mV
0.4
±1
uA
PSRR
NOISE RTINote 5
en
Power Supply Rejection Ratio
Vs = +2.7~18V, VIN+ = +18V, VSENSE = 0 mV
uV/V
Input Voltage Noise Density
f = 1kHz
30
nV/√Hz
OUTPUT
TP199A1T
50
100
±0.1%
3
V/V
V/V
G
Gain
TP199A2T
EG
EG TC
CLOAD
VOH
Gain Error
VSENSE = -5~5mV, -40°C to 125°C
-40°C to 125°C
±1%
10
Gain Error Vs Temperature
Maxim capacitive load
Output Swing from Supply Rail
Output Swing from Supply Rail
ppm
nF
V
No oscillation
1
RLOAD = 10kΩ to REF, -40°C to 125°C
RLOAD = 10kΩ to REF, -40°C to 125°C
0.02
0.01
0.05
0.05
VOL
V
FREQUENCY RESPONSE
CLOAD = 10pF, TP199A1T
CLOAD = 10pF, TP199A2T
48
30
kHz
kHz
V/μs
BW
Bandwidth
SR
Slew Rate
0.6
POWER SUPPLY
V+
IQ
Supply Voltage
Quiescent Current
2.7
36
V
VSENSE = 0 mV
120
145
μA
TEMPERATURE RANGE
Specified range
-40
-55
125
150
°C
°C
Operating range
Note 5: RTI = referred to input
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Rev.A.1
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TP199A1T/2T
Zero-Drift, Bi-directional Current Sense Amplifier
Typical Performance Characteristics
The TP199A1T is used for characteristics at TA = 25°C, VS = 5V, VIN+ =12V, and VREF=VS/2, unless otherwise noted
Voltage Offset vs Temperature
CMRR vs. Temperature
1
-1
140
120
100
80
-3
-5
-7
60
-9
40
-11
-13
-15
20
0
-50
-20
10
40
70
100
130
-50
0
50
Temperature(℃)
Figure 2
100
Temperature(℃)
Figure 1
CMRR Vs Frequency
Gain vs. Frequency
100
80
60
40
20
40
30
20
10
0
20
200
2000
20000
200000
20
200
2000
Frequency(Hz)
Figure 4
20000
200000
Frequency(Hz)
Figure 3
PSRR vs. Frequency
0.1-Hz to 10Hz Voltage Noise (Referred-to-Input)
120
100
80
60
40
20
0
Time(1s/div)
20
200
2000
Frequency(Hz)
20000
200000
Figure 5
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Rev.A.1
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TP199A1T/2T
Zero-Drift, Bi-directional Current Sense Amplifier
Typical Performance Characteristics
The TP199A1T is used for characteristics at TA = 25°C, VS = 5V, VIN+ =12V, and VREF=VS/2, unless otherwise noted
Common-Mode Voltage Transient Response
Step response (10-mVpp Input Step)
Time(100us/div)
Time(50us/div)
Figure 7
Figure 8
Noninverting DifferentialInputOverload
Inverting Differential Input Overload
Input Voltage
Input Voltage
0V
0V
0V
Output Voltage
0V
Output Voltage
Time(100us/div)
Time(100us/div)
Figure 10
Figure 9
Brownout Recovery
Supply Voltage
Start-up Response
Supply Voltage
Output Voltage
Output Voltage
0V
0V
0
Time(100us/div)
Time(100us/div)
Figure 12
Figure 11
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Rev.A.1
5/ 9
TP199A1T/2T
Zero-Drift, Bi-directional Current Sense Amplifier
Typical Performance Characteristics
The TP199A1T is used for characteristics at TA = 25°C, VS = 5V, VIN+ =12V, and VREF=VS/2, unless otherwise noted
Input Bias Current vs Temperature
Quiescent Current vs Temperature
50
45
40
35
30
25
150
140
130
120
110
100
90
-40
-20
0
20
40
60
80
100 120
-40 -20
0
20
40
60
80
100 120
Temperature(°C)
Temperature(°C)
Figure 13
Figure 14
Input Bias Current
vs Common-Mode Voltage
80
60
40
20
0
-20
0
10
20
30
40
Common-Mode Voltage
Figure 15
Pin Functions
IN-: Inverting Input of the Amplifier.
IN+: Non-Inverting Input of Amplifier.
V+: Positive Power Supply. Typically, the voltage is from 2.7V
to 36V. A bypass capacitor of 0.1μF as close to the part as
possible should be used between power supply pin and ground
pin.
OUT: Amplifier Output. The voltage range extends to within mV
of each supply rail.
REF: Reference voltage
GND: Negative Power Supply.
Operation Overview
The TP199 family is 36V, common-mode, zero-drift topology, current-sensing amplifiers that can be used in both low-side and
high-side configurations. These specially-designed, current-sensing amplifiers are able to accurately measure voltages developed
across current-sensing resistors on common-mode voltages that far exceed the supply voltage powering the device. Current can be
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Rev.A.1
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TP199A1T/2T
Zero-Drift, Bi-directional Current Sense Amplifier
measured on input voltage rails as high as 36 V while the device can be powered from supply voltages as low as 2.7 V.
The zero-drift topology enables high-precision measurements with maximum input offset voltages as low as 60 μV with a
maximum temperature contribution of 0.5 μV/°C over the full temperature range of –40°C to 125°C.
Applications Information
Application schematic
Reference
voltage
RSHUNT
Supply
Load
Output
REF
OUT
R1
R3
IN-
GND
V+
-
+
IN+
+2.7V to +36V
R2
R4
CBYPASS
0.01µF
to 0.1µF
Above figure shows the basic connections of the TP199. The input pins, IN+ and IN–, should be connected as closely as
possible to the shunt resistor to minimize any resistance in series with the shunt resistor.
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.
Selecting RSHUNT
The zero-drift offset performance of the TP199 offers several benefits. Most often, the primary advantage of the low offset
characteristic enables lower full-scale drops across the shunt. For example, nonzero-drift current shunt monitors typically require a
full-scale range of 100 mV.
The TP199 family gives equivalent accuracy at a full-scale range on the order of 10 mV. This accuracy reduces shunt
dissipation by an order of magnitude with many additional benefits.
Alternatively, there are applications that must measure current over a wide dynamic range that can take advantage of the low
offset on the low end of the measurement. Most often, these applications can use the lower gains of the TP199 to accommodate
larger shunt drops on the upper end of the scale. For instance, an TP199A1T operating on a 3.3-V supply could easily handle a
full-scale shunt drop of 60 mV, with only 100 uV of offset.
REF Input Impedance Effects
As with any difference amplifier, the TP199 family common-mode rejection ratio is affected by any impedance present at the
REF input. This concern is not a problem when the REF pin is connected directly to most references or power supplies. When using
resistive dividers from the power supply or a reference voltage, the REF pin should be buffered by an op amp.
Power Supply Recommendation
The input circuitry of the TP199 can accurately measure beyond its power-supply voltage, V+. For example, the V+ power
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Rev.A.1
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TP199A1T/2T
Zero-Drift, Bi-directional Current Sense Amplifier
supply can be 5 V, whereas the load power-supply voltage can be as high as 36 V. However, the output voltage range of the OUT pin
is limited by the voltages on the power-supply pin. Note also that the TP199 can withstand the full input signal range up to 36 V at the
input pins, regardless of whether the device has power applied or not.
Input Capacitance
To ensure better performance about TP199, recommend to add 100nF capacitance between IN+ with GND and it should be
close to the IN+ pin in PCB layout.
Proper Board Layout
To ensure optimum performance at the PCB level, care must be taken in the design of the board layout. To avoid leakage
currents, the surface of the board should be kept clean and free of moisture. Coating the surface creates a barrier to moisture
accumulation and helps reduce parasitic resistance on the board.
Keeping supply traces short and properly bypassing the power supplies minimizes power supply disturbances due to output
current variation, such as when driving an ac signal into a heavy load. Bypass capacitors should be connected as closely as possible
to the device supply pins. Stray capacitances are a concern at the outputs and the inputs of the amplifier. It is recommended that
signal traces be kept at least 5mm from supply lines to minimize coupling.
A variation in temperature across the PCB can cause a mismatch in the Seebeck voltages at solder joints and other points
where dissimilar metals are in contact, resulting in thermal voltage errors. To minimize these thermocouple effects, orient resistors so
heat sources warm both ends equally. Input signal paths should contain matching numbers and types of components, where
possible to match the number and type of thermocouple junctions. For example, dummy components such as zero value resistors
can be used to match real resistors in the opposite input path. Matching components should be located in close proximity and should
be oriented in the same manner. Ensure leads are of equal length so that thermal conduction is in equilibrium. Keep heat sources on
the PCB as far away from amplifier input circuitry as is practical.
The use of a ground plane is highly recommended. A ground plane reduces EMI noise and also helps to maintain a constant
temperature across the circuit board.
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Rev.A.1
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TP199A1T/2T
Zero-Drift, Bi-directional Current Sense Amplifier
Package Outline Dimensions
SC70-6 /SOT-363
Millimeters
MIN
Inches
Symbol
MIN
MAX
0.039
0.004
0.036
0.012
0.010
MAX
1.00
0.10
0.90
0.30
0.25
A
A1
A2
b
0.031
0.001
0.034
0.006
0.006
0.80
0.025
0.85
0.15
0.15
0.10
0.10
1.85
b1
c
0.004
0.004
0.073
0.008
0.006
0.085
0.20
0.15
2.15
c1
D
E
0.084BSC
0.045 0.053
2.1BSC -
E1
e
1.15
1.35
0.46
0.0256Ref
0.0512Ref
0.65 Ref
1.30 Ref
e1
L
L1
L2
N
0.010
0.018
0.26
0.016 Ref
04.00 Ref
0.15 BSC
-
-
0.006 BSC
6
6
R
0.04
0o
-
0.10
0o
-
8o
8o
3PEAK and the 3PEAK logo are registered trademarks of 3PEAK INCORPORATED. All
other trademarks are the property of their respective owners.
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Rev.A.1
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