Datasheet

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SWITCHING FREQUENCY
f
s

6.6
R
OSC
 C
OSC
(9)
APPLICATION CIRCUIT
INP
INN
SHUTDOWN
GAIN0
GAIN1
PV
DD
OUTP
PGND
BYPASS
AGND
COSC
ROSC
V
DD
PV
DD
OUTN
PGND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TPA2000D1
C5
1 µF
C6
1 µF
C7
1 µF
C1
220 pF
R1
120 kΩ
C2
1 µF
C3
1 µF
C4
1 µF
C8
10 µF
OUT+
V
DD
OUT–
Audio Input–
V
DD
To System
Controller
Audio Input+
Gain Select
Gain Select
V
DD
TPA2000D1
SLOS328F – JUNE 2000 – REVISED MARCH 2004
The switching frequency is determined using the values of the components connected to ROSC (pin 13) and
COSC (pin 14) and are calculated using Equation 9 .
The switching frequency was chosen to be centered on 250 kHz. This frequency represents the optimization of
audio fidelity due to oversampling and the maximization of efficiency by minimizing the switching losses of the
amplifier.
The recommended values are a resistance of 120 kΩ and a capacitance of 220 pF. Using these component
values, the amplifier operates properly by using 5% tolerance resistors and 10% tolerance capacitors. The
tolerance of the components can be changed as long as the switching frequency remains between 200 kHz and
300 kHz. Within this range, the internal circuitry of the device provides stable operation.
Table 3. TPA2000D1 APPLICATION CIRCUIT BILL OF MATERIALS
REFERENCE DESCRIPTION SIZE QUANTITY MANUFACTURER PART NUMBER
C1 Capacitor, ceramic, 220 pF, ±10%, XICON, 50 V 0805 1 Mouser 140-CC501B221K
C2 - C7 Capacitor, ceramic, 1 µF, +80%/-20%, Y5V, 16 V 0805 6 Murata GRM40-Y5V105Z16
C8 Capacitor, ceramic, 10 µF, +80%/-20%, Y5V, 16 V 1210 1 Murata GRM235-Y5V106Z16
R1 Resistor, chip, 120 kΩ, 1/10 W, 5%, XICON 0805 1 Mouser 260-120K
U1 IC, TPA2000D1, audio power amplifier, 2-W, single 24-pin 1 TI TPA2000D1PW
channel, class-D TSSOP
15