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TPA2100P1YZHR Datenblatt(PDF) 10 Page - Texas Instruments

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Teilenummer TPA2100P1YZHR
Bauteilbeschribung  19-VPP Mono Class-D Audio Amplifier for Piezo/Ceramic Speakers
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

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RESISTOR – SPEAKER – RESISTOR LOAD CONFIGURATION
Vdd SW
IN-
IN+
GND
GND
OUT +
OUT -
VccOUT
VccIN
C IN
C IN
SD
SDa
GAIN
Digital
BaseBand
Analog
Baseband
or
CODEC
VIN
2 .5 Vto
5.5 V
Vref
BST
10nF
10 F
m
10 F
m
1 F
m
4.7 H
m
5~10 W
5~10 W
1 F
m
0.1~2 F
m
R
R
AUDMAX
SPK
1
=
2
R
C
f
p
´
´
´
(1)
OUTPEAK
CLASSDPEAK
2
2
V
I
=
R
+ XC
(2)
AUDMAX
SPK
1
XC =
2
f
C
p
´
´
´
(3)
RESISTOR – SPEAKER – INDUCTOR LOAD CONFIGURATION
TPA2100P1
SLOS595 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
This is the simplest configuration. However, this type of load configuration does not achieve the best efficiency
possible. Thus, it is recommended to use the resistor – speaker – inductor load configuration. The following
figure shows an example of the resistor – speaker – resistor configuration.
Figure 15. Application Schematic with Resistor – Speaker – Resistor Load Configuration
For the RC load configuration, only two calculations are required. Note that R in Equation 1 is the sum of the two
output resistors in Figure 15.
The highest desired audio frequency will be limited by the RC low-pass filter configuration of the load:
Peak Output Current from the Class-D Amplifier should therefore be limited to the maximum audio frequency:
Where XC is:
To calculate the proper boost converter inductor required for this application, see the Inductor Selection section.
Note that an input low-pass filter should be added before the audio amplifier in order to limit the audio frequency,
fAUDMAX.
The second configuration with a resistor – speaker – inductor load is the most efficient configuration and is the
preferred solution. Figure 16 shows an example of this configuration.
10
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2100P1


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