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TPA2012D2RTJR Datasheet(PDF) 17 Page - Texas Instruments

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Part # TPA2012D2RTJR
Description  2.1-W/Channel Stereo Filter-Free Class-D Audio Power Amplifier
Download  33 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPA2012D2RTJR Datasheet(HTML) 17 Page - Texas Instruments

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17
TPA2012D2
www.ti.com
SLOS438F – DECEMBER 2004 – REVISED MARCH 2017
Product Folder Links: TPA2012D2
Submit Documentation Feedback
Copyright © 2004–2017, Texas Instruments Incorporated
Typical Applications (continued)
10.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 2.
Table 2. Design Parameters
PARAMETER
VALUE
Power supply
5 V
Enable inputs
High > 1.3 V
Low < 0.35 V
Speaker
8 Ω
10.2.1.2 Detailed Design Procedure
10.2.1.2.1
Surface Mount Capacitors
Temperature and applied DC voltage influence the actual capacitance of high-K materials. Table 3 shows the
relationship between the different types of high-K materials and their associated tolerances, temperature
coefficients, and temperature ranges. Notice that a capacitor made with X5R material can lose up to 15% of its
capacitance within its working temperature range.
In an application, the working capacitance of components made with high-K materials is generally much lower
than nominal capacitance. A worst-case result with a typical X5R material might be –10% tolerance, –15%
temperature effect, and –45% DC voltage effect at 50% of the rated voltage. This particular case would result in
a working capacitance of 42% (0.9 × 0.85 × 0.55) of the nominal value.
Select high-K ceramic capacitors according to the following rules:
1. Use capacitors made of materials with temperature coefficients of X5R, X7R, or better.
2. Use capacitors with DC voltage ratings of at least twice the application voltage. Use minimum 10-V
capacitors for the TPA2012D2.
3. Choose a capacitance value at least twice the nominal value calculated for the application. Multiply the
nominal value by a factor of 2 for safety. If a 10-µF capacitor is required, use 20 µF.
The preceding rules and recommendations apply to capacitors used in connection with the TPA2012D2. The
TPA2012D2 cannot meet its performance specifications if the rules and recommendations are not followed.
Table 3. Typical Tolerance and Temperature Coefficient of Capacitance by Material
MATERIAL
COG/NPO
X7R
X5R
Typical tolerance
±5%
±10%
80% to –20%
Temperature
±30 ppm
±15%
22% to –82%
Temperature range (°C)
–55°C to 125°C
–55°C to 125°C
–30°C to 85°C
10.2.1.2.2
Decoupling Capacitor (CS)
The TPA2012D2 is a high-performance Class-D audio amplifier that requires adequate power supply decoupling
to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients,
spikes, or digital hash on the line a good low equivalent-series-resistance (ESR) ceramic capacitor, typically
1 µF, placed as close as possible to the device PVDD lead works best. Placing this decoupling capacitor close to
the TPA2012D2 is important for the efficiency of the Class-D amplifier, because any resistance or inductance in
the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise
signals, a 4.7 µF or greater capacitor placed near the audio power amplifier would also help, but it is not required
in most applications because of the high PSRR of this device.
10.2.1.2.3
Input Capacitors (CI)
The TPA2012D2 does not require input coupling capacitors if the design uses a differential source that is biased
from 0.5 V to VDD – 0.8 V. If the input signal is not biased within the recommended common-mode input range, if
high-pass filtering is needed (see Figure 37), or if using a single-ended source (see Figure 38), input coupling
capacitors are required.


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