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C
I2
u
1
ǒ
2p 150kW 20Hz
Ǔ
(9)
C
I2
u 53 nF
(10)
_
+
IN-
IN+
PWM H-
Bridge
V
O+
V
O-
Internal
Oscillator
C
S
To Battery
V
DD
GND
Bias
Circuitry
R
I2
R
I2
Differential
Input 1
Filter-Free Class D
SHUTDOWN
R
I1
R
I1
Single-Ended
Input 2
C
I2
C
I2
Summing Two Single-Ended Input Signals
Gain 1 +
V
O
V
I1
+
2 x 150 kW
R
I1
ǒ
V
V
Ǔ
(11)
Gain 2 +
V
O
V
I2
+
2 x 150 kW
R
I2
ǒ
V
V
Ǔ
(12)
C
I1
+
1
ǒ
2p R
I1
f
c1
Ǔ
(13)
C
I2
+
1
ǒ
2p R
I2
f
c2
Ǔ
(14)
C
P
+ C
I1
) C
I2
(15)
R
P
+
R
I1
R
I2
ǒ
R
I1
) R
I2
Ǔ
(16)
TPA2010D1
SLOS417C – OCTOBER 2003 – REVISED SEPTEMBER 2007
Figure 31. Application Schematic With TPA2010D1 Summing Differential Input and Single-Ended Input
Signals
Four resistors and three capacitors are needed for summing single-ended input signals. The gain and corner
frequencies (f
c1
and f
c2
) for each input source can be set independently (see Equation 11 through Equation 14 ,
and Figure 32 ). Resistor, R
P
, and capacitor, C
P
, are needed on the IN+ terminal to match the impedance on the
IN – terminal. The single-ended inputs must be driven by low impedance sources even if one of the inputs is not
outputting an ac signal.
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Product Folder Link(s): TPA2010D1