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INA253 데이터시트(Datasheet) 18 Page - TI store

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부품명 INA253
상세내용  High Voltage, Bidirectional, Zero-Drift, Current-Shunt Monitor with Integrated 2-mΩ Precision Low Inductive Shunt Resistor
PDF  24 Pages
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Re
Impedance at
Resonance
Inductive Rise
(Le)
Frequency (hZ)
20
100
500
1000
10000
20000
4
12
16
20
24
28
18
INA253
SLOS954 – MAY 2018
www.ti.com
Product Folder Links: INA253
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Copyright © 2018, Texas Instruments Incorporated
9.2.2.2 Detailed Design Procedure
For this application, the INA253 measures current flowing through the speaker from the CLASS-D amplifier. The
integrated shunt of 2 mΩ with a low inductance of 3 nH is ideal for current sensing in speaker application. The
low inductive shunt enables accurate current sensing across frequencies over the range of audio 20 hz to 20
kHz.
The INA253 is setup in a bi-directional with the reference set to mid-supply. The power supply to INA253 is setup
at 5 V. The output of INA253 is set at 2.5 V. The INA253 with a gain of 100 mV/A, the INA253 output for a peak
to peak of 10-A current the output of the INA253 will swing from 3.5 V to 1.5 V. The output can be directly
connected to ADC input that has a full scale range of 5 V. The INA253 has a low THD+N of 0.1% at 1 kHz that
enables distortion measurement of speaker. The INA253 can measure the impedance of the speaker and
accurately measure the resonance frequency and peak impedance at resonance frequency. The INA253 can
accurately track changes in impedance real time.
9.2.2.3 Application Curve
A typical example output response of speaker of 4-Ω impedance measurement from 20 hZ to 20 kHz is as shown
in Figure 16.
Figure 16. Speaker Impedance Measurement
10 Power Supply Recommendations
The INA253 makes accurate measurements beyond the connected power-supply voltage (VS) because the
inputs (IN+ and IN–) operate anywhere between –4 V and 80 V independent of VS. For example, the VS power
supply equals 5 V and the common-mode voltage of the measured shunt can be as high as 80 V. Although the
common-mode voltage of the input can be beyond the supply voltage, the output voltage range of the INA253
series is constrained to the supply voltage.
Place the power-supply bypass capacitor as close as possible to the supply and ground pins. The recommended
value of this bypass capacitor is 0.1 μF. Additional decoupling capacitance can be added to compensate for
noisy or high-impedance power supplies. If the INA253 output is set to mid-supply, then extreme care must be
taken to minimize noise on the power supply.




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