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C
I
+
1
ǒ
2p R
I
f
c
Ǔ
(2)
_
+
IN−
IN+
PWM H−
Bridge
V
O−
V
O+
Internal
Oscillator C
S
To Battery
V
DD
GND
Bias
Circuitry
Differential
Input
TPA2032D1
Filter-Free Class D
SHUTDOWN
_
+
IN−
IN+
PWM H−
Bridge
V
O−
V
O+
Internal
Oscillator
C
S
To Battery
V
DD
GND
Bias
Circuitry
Differential
Input
TPA2032D1
Filter-Free Class D
SHUTDOWN
C
I
C
I
TPA2032D1
TPA2033D1
TPA2034D1
SLOS476 – JUNE 2006
APPLICATION INFORMATION (continued)
Equation 2 is reconfigured to solve for the input coupling capacitance.
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 µ F or larger).
Figure 35. Typical TPA2032D1 Application Schematic With Differential Input for a Wireless Phone
Figure 36. TPA2032D1 Application Schematic With Differential Input and Input Capacitors
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