TPA2010D1 Datasheet, PDF (22/33 Pages) Texas Instruments – 2.5-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER

TPA2010D1
SLOS417D – OCTOBER 2003 – REVISED NOVEMBER 2015
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The value of the input capacitor is important to consider as it directly affects the bass (low frequency)
performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the
corner frequency can be set to block low frequencies in this application.
Equation 21 is reconfigured to solve for the input coupling capacitance.
1
C_I = _{:tN × RI × B%;}
(21)
If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better,
because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below.
For a flat low-frequency response, use large input coupling capacitors (1 µF). However, in a GSM phone the
ground signal is fluctuating at 217 Hz, but the signal from the codec does not have the same 217 Hz fluctuation.
The difference between the two signals is amplified, sent to the speaker, and heard as a 217 Hz hum.
11.2.2.3 Application Curves
Refer to the Application Curves section.
11.2.3 TPA20010D1 with Single-Ended Input
The TPA20010D1 can be used with Single-Ended inputs, using Input capacitors. This section describes the
design considerations for this application.
Single-ended
C_I
R_I
Input
R_I
C_I
SHUTDOWN
Internal
V_DD
Oscillator
IN-
_
+
IN+
PWM
H-
V_O+
Bridge
V_O-
Bias
Circuitry
GND
TPA2010D1
Filter-Free Class D
To Battery
C_S
Figure 39. TPA2010D1 with Single-Ended Input
11.2.3.1 Design Requirements
Refer to the Design Requirements section.
11.2.3.2 Detailed Design Procedure
Refer to the Detailed Design Procedure section.
11.2.3.3 Application Curves
Refer to the Application Curves section.
22
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