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TPA3116D2-Q1 датащи(PDF) 11 Page - Texas Instruments

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номер детали TPA3116D2-Q1
подробное описание детали  100-W and 50-W Class-D Stereo Automotive Amplifiers
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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TPA3116D2-Q1 датащи(HTML) 11 Page - Texas Instruments

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Input
Signal
Ci
IN
Zi
Zf
i
i
1
f
2 Z C
p
=
ƒ
5
6
7
8
9
10
INNR
PLIMIT
GVDD
GAIN/SLV
GND
2
1
1
2
C5
1 F
µ
2
1
51 k
R1
51 k
R2
TPA3116D2-Q1, TPA3118D2-Q1
www.ti.com
SLOS862A – JULY 2015 – REVISED AUGUST 2015
Table 2. Gain and Master or Slave
MASTER / SLAVE
GAIN
R1 (to GND)(1)
R2 (to GVDD)(1)
INPUT IMPEDANCE
MODE
Master
20 dB
5.6 k
Ω
OPEN
60 k
Ω
Master
26 dB
20 k
Ω
100 k
Ω
30 k
Ω
Master
32 dB
39 k
Ω
100 k
Ω
15 k
Ω
Master
36 dB
47 k
Ω
75 k
Ω
9 k
Ω
Slave
20 dB
51 k
Ω
51 k
Ω
60 k
Ω
Slave
26 dB
75 k
Ω
47 k
Ω
30 k
Ω
Slave
32 dB
100 k
Ω
39 k
Ω
15 k
Ω
Slave
36 dB
100 k
Ω
16 k
Ω
9 k
Ω
(1)
Resistor tolerance should be 5% or better.
Figure 12. Gain, Master or Slave
In master mode, the SYNC terminal is an output, in slave mode, SYNC terminal is an input for a clock input.
7.3.2 Input Impedance
The input stage of the TPA311xD2-Q1 family is a fully differential input stage, and the input impedance changes
with the gain setting from 9 k
Ω at 36-dB gain to 60 kΩ at 20-dB gain. Table 2 lists the values from mininimum to
maximum gain. The tolerance of the input resistor value is ±20%, so the minimum value is higher than 7.2 k
Ω.
The inputs must be ac-coupled to minimize the output dc offset and ensure correct ramping of the output
voltages during power ON and power OFF. The input ac-coupling capacitor together with the input impedance
forms a high-pass filter with the following cutoff frequency:
(1)
If a flat bass response is required down to 20 Hz, the recommended cutoff frequency is a tenth of that, 2 Hz.
Table 3 lists the recommended ac-coupling capacitors for each gain step. If –3 dB is accepted at 20 Hz, 10 times
lower capacitors can used – for example, a 1 µF can be used.
Table 3. Recommended Input AC-Coupling Capacitors
GAIN
INPUT IMPEDANCE
INPUT CAPACITANCE
HIGH-PASS FILTER
20 dB
60 k
Ω
1.5 µF
1.8 Hz
26 dB
30 k
Ω
3.3 µF
1.6 Hz
32 dB
15 k
Ω
5.6 µF
2.3 Hz
36 dB
9 k
Ω
10 µF
1.8 Hz
Figure 13. Input Impedance
Copyright © 2015, Texas Instruments Incorporated
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Product Folder Links: TPA3116D2-Q1 TPA3118D2-Q1


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