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TPA3131D2 Datasheet(PDF) 14 Page - Texas Instruments

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Part # TPA3131D2
Description  25-W Filter-Free Class-D Stereo Amplifier
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPA3131D2 Datasheet(HTML) 14 Page - Texas Instruments

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0
1
2
3
4
5
6
7
0
5
10
15
20
25
30
OUTPUT POWER [W]
TPA3131D2 8
Ÿ
TPA3132D2 8
Ÿ
C001
0
1
2
3
4
5
6
7
0
10
20
30
40
50
60
OUTPUT POWER [W]
TPA3131D2 4
Ÿ
TPA3132D2 4
Ÿ
C002
2
L
P
L
S
OUT
L
R
V
R + 2
R
P
=
for unclipped power
2
R
æ
ö
æ
ö
´
ç
÷
ç
÷
ç
÷
´
è
ø
è
ø
´
TPA3131D2, TPA3132D2
SLOS841B – SEPTEMBER 2013 – REVISED JANUARY 2015
www.ti.com
where
POUT (10%THD) = 1.25 × POUT (unclipped)
RL is the load resistance.
RS is the total series resistance including RDS(on), and output filter resistance.
VP is the peak amplitude
VP = 4 × PLIMIT voltage if PLIMIT < 4 × VP
(2)
Increasing the PLIMIT voltage from a given value increases the maximum output voltage swing until it equals
PVCC. Adjusting PLIMIT to a higher value will disable the PLIMIT function and will offer highest available output
power, however for TPA3131D2 and TPA3132D2 it is always advised to use the PLIMIT function if PVCC is
higher than nominal value to prevent shutdown due to over current protection. If PLIMIT is disabled on
TPA3131D2 and TPA3132D2 an over current shutdown can occur with minimum recommended load impedance
when PVCC is higher than its nominal value. To disable the PLIMIT function, the PLIMIT pin is simply connected
to GVDD.
Figure 22. PLIMIT vs. Max. Output Power, 8
Ω load
Figure 23. PLIMIT vs. Max. Output Power, 4
Ω load
Table 3. Power Limit Example
MINIMUM
PART NUMBERS
PLIMIT VOLTAGE (V)(1)
R to GND
R to GVDD
OUTPUT POWER 8
Ω (W)
PVCC (V)
7.4 V
TPA3131D2, TPA3132D2
1.85
27 k
Ω
75 k
Ω
4
12 V
TPA3132D2
2.87
39 k
Ω
56 k
Ω
10
19 V
TPA3132D2
4.26
56 k
Ω
36 k
Ω
25
(1)
PLIMIT measurements taken with EVM gain set to 26dB and input level adjusted for 10% THD.
7.3.5 GVDD Supply
The GVDD Supply is used to power the gates of the output full bridge transistors. It can also be used to supply
the PLIMIT and GAIN/SLV voltage dividers. Decouple GVDD with a X5R ceramic 1 µF capacitor to GND. The
GVDD supply is not intended to be used for external supply. It is recommended to limit the current consumption
by using resistor voltage dividers for GAIN/SLV and PLIMIT of 100 k
Ω or more.
14
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