TPA2005D1-Q1 Datasheet, PDF (17/37 Pages) Texas Instruments – 1.4-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER

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TPA2005D1-Q1
SLOS474D – AUGUST 2005 – REVISED DECEMBER 2015
Device Functional Modes (continued)
ǒ Ǔ Gain
1
+
VO
VI1
+
2
150 kW
RI1
V
V
(8)
ǒ Ǔ Gain
2
+
VO
VI2
+
2
150 kW
RI2
V
V
(9)
CI2
+
ǒ_2p
1
RI2
f
c2^Ǔ
(10)
The high-pass corner frequency of the single-ended input is set by C_I2. If the desired corner frequency is less
than 20 Hz, then:
CI2
u
ǒ_2p
1
150kW
20Hz^Ǔ
(11)
CI2 u 53pF
(12)
R_I1
Differential
Input 1
R_I1
C_I2
Single-Ended
R_I2
Input 2
R_I2
C_I2
SHUTDOWN
Internal
V_DD
Oscillator
IN–
_
+
IN+
PWM
H–
V_O+
Bridge
V_O–
Bias
Circuitry
GND
Filter-Free Class D
To Battery
C_S
Figure 36. Application Schematic With TPA2005D1-Q1 Summing Differential Input And
Single-Ended Input Signals
9.4.1.3 Summing Two 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 13 through Equation 16
and Figure 37). 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.
ǒ Ǔ Gain
1
+
VO
VI1
+
2
150 kW
RI1
V
V
(13)
ǒ Ǔ Gain
2
+
VO
VI2
+
2
150 kW
RI2
V
V
(14)
CI1
+
ǒ_2p
1
RI1
f
c1^Ǔ
(15)
CI2
+
ǒ_2p
1
RI2
f
c2^Ǔ
(16)
CP + CI1 ) CI2
(17)
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