TPA2005D1 Datasheet, PDF (23/42 Pages) Texas Instruments – 1.1 W MONO FILTER FREE CLASS D AUDIO POWER AMPLIFIER

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TPA2005D1
SLOS369G – JULY 2002 – REVISED OCTOBER 2015
Equation Equation 22 is reconfigured to solve for the input coupling capacitance.
1
C
I
=
(2p
´
R
I
´
f
c
)
(22)
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, and
causes pop. Any capacitor in the audio path should have a rating of X7R or better.
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.
10.2.3 TPA2005D1 with Single-Ended Input
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
TPA2005D1
Filter-Free Class D
To Battery
C_S
Figure 43. TPA2005D1 Single-Ended Input
10.2.3.1 Design Requirements
Please see Design Requirements.
10.2.3.2 Detailed Design Procedure
Please see Detailed Design Procedure.
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