Equation 3 shows the relationship between the boost capacitance, C, to load current, load voltage, ripple

Insert the maximum allowed ripple voltage into Equation 3 and solve for C. The 1.5 multiplier accounts for

capacitance loss due to applied dc voltage and temperature for X5R and X7R ceramic capacitors.

PVDD

BOOST

I

(PVDD

VBAT)

C = 1.5

V

PVDD

´

-

´

D

´ ¦

´

(3)

10.2.1.2.3 Components Location and Selection

10.2.1.2.3.1 Decoupling Capacitors

The TPA2015D1 is a high-performance Class-D audio amplifier that requires adequate power supply decoupling.

Adequate power supply decoupling to ensures that the efficiency is high and total harmonic distortion (THD) is

low.

Place a low equivalent-series-resistance (ESR) ceramic capacitor, typically 0.1 μF, within 2 mm of the VBAT ball.

This choice of capacitor and placement helps with higher frequency transients, spikes, or digital hash on the line.

Additionally, placing this decoupling capacitor close to the TPA2015D1 is important, as any parasitic resistance

or inductance between the device and the capacitor causes efficiency loss. In addition to the 0.1 µF ceramic

capacitor, place a 2.2 μF to 10 μF capacitor on the VBAT supply trace. This larger capacitor acts as a charge

reservoir, providing energy faster than the board supply, thus helping to prevent any droop in the supply voltage.

10.2.1.2.3.2 Input Capacitors

Input audio DC decoupling capacitors are recommended. The input audio DC decoupling capacitors prevents

the AGC from changing the gain due to audio DAC output offset. The input capacitors and TPA2015D1 input

Any mismatch in capacitance between the two inputs will cause a mismatch in the corner frequencies. Severe

mismatch may also cause turn-on pop noise. Choose capacitors with a tolerance of ±10% or better.

(

)

x

x

c

I

I

1

f

=

2

R C

p

(4)

10.2.1.3 Application Curves

For application curves, see the figures listed in Table 10-3.

Table 10-3. Table of Graphs

DESCRIPTION

FIGURE NUMBER

Supply Current vs Output Power

Figure 7-3

Peak Output Voltage vs Peak Input Voltage

Figure 7-4

Total Efficiency vs Output Power

Figure 7-5

Output Power vs Supply Voltage

Figure 7-9

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TPA2015D1

SLOS638C – NOVEMBER 2011 – REVISED JUNE 2022

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