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TPA3126D2 Datasheet(PDF) 16 Page - Texas Instruments

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Part # TPA3126D2
Description  50-W Stereo, Analog-Input, Class-D Audio Amplifier with Low, 15-mA Idle Current and AM Avoidance
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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2
L
P
L
S
OUT
L
R
V
R + 2
R
P
=
for unclipped power
2
R
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16
TPA3126D2
SLOS942 – APRIL 2018
www.ti.com
Product Folder Links: TPA3126D2
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Copyright © 2018, Texas Instruments Incorporated
(1)
PLIMIT measurements taken with EVM gain set to 26 dB and input voltage set to 1 Vrms.
The PLIMIT circuit sets a limit on the output peak-to-peak voltage. This is done by limiting the duty cycle to a
fixed maximum value. The limit can be considered as a "virtual" voltage rail which is lower than the supply
connected to PVCC. The "virtual" rail is approximately four times the voltage at the PLIMIT pin. The output
voltage can be used to calculate the maximum output power for a given maximum input voltage and speaker
impedance.
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, which is limited by the "virtual" voltage rail.
(2)
Table 3. Power Limit Example
PVCC (V)
PLIMIT VOLTAGE (V)(1)
R to GND
R to GVDD
OUTPUT VOLTAGE (Vrms)
24 V
GVDD
Open
Short
17.9
24 V
3.3
45 kΩ
51 kΩ
12.67
24 V
2.25
24 kΩ
51 kΩ
9
12 V
GVDD
Open
Short
10.33
12 V
2.25
24 kΩ
51 kΩ
9
12 V
1.5
18 kΩ
68 kΩ
6.3
8.3.5 GVDD Supply
The GVDD Supply is used to power the gates of the output full bridge transistors. The GVDD supply 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. The current consumption should be
limited by using resistor voltage dividers for GAIN/SLV and PLIMIT of 100 k
Ω or more.
8.3.6 BSPx and BSNx Capacitors
The full H-bridge output stages use only NMOS transistors. Therefore, they require bootstrap capacitors for the
high side of each output to turn on correctly. A 220-nF ceramic capacitor of quality X5R or better, rated for at
least 16 V, must be connected from each output to the corresponding bootstrap input. (See the application circuit
diagram in Figure 34.) The bootstrap capacitors connected between the BSxx pins and corresponding output
function as a floating power supply for the high-side N-channel power MOSFET gate drive circuitry. During each
high-side switching cycle, the bootstrap capacitors hold the gate-to-source voltage high enough to keep the high-
side MOSFETs turned on.
8.3.7 Differential Inputs
The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel. To
use the TPA3126D2 with a differential source, connect the positive lead of the audio source to the RINP or LINP
input and the negative lead from the audio source to the RINN or LINN input. To use the TPA3126D2 with a
single-ended source, AC ground the negative input through a capacitor equal in value to the input capacitor on
positive and apply the audio source to either input. In a single-ended input application, the unused input should
be AC grounded at the audio source instead of at the device input for best noise performance. For good transient
performance, the impedance seen at each of the two differential inputs should be the same.
The impedance seen at the inputs should be limited to an RC time constant of 1 ms or less if possible to allow
the input DC blocking capacitors to become completely charged during the 40-ms power-up time. If the input
capacitors are not allowed to completely charged, there will be some additional sensitivity to the component
matching which can result in pop if the input components are not well matched.


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