參數(shù)資料
型號: TPA2100P1YZHT
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 1 CHANNEL, AUDIO AMPLIFIER, PBGA16
封裝: 2.10 X 2.10 MM, GREEN, WCSP-16
文件頁數(shù): 3/23頁
文件大?。?/td> 963K
代理商: TPA2100P1YZHT
Vdd SW
IN-
IN+
GND
OUT+
OUT-
VccOUT
VccIN
CIN
SD
SDa
GAIN
Digital
BaseBand
Analog
Baseband
or
CODEC
VIN
2.5Vto
5.5 V
Vref
BST
10 nF
1 F
m
4.7 H
m
10 F
m
10~20 W
10~22 H
m
10 F
m
0.1~2 F
m
1 F
m
R
L
SPK
R
C
ζ =
2
L
(4)
AUDMAX
SPK
1
=
2
R
C
f
p
(5)
AUDMAX
SPK
1
XC =
2 ×
×
× C
f
p
(6)
AUDMAX
XL = 2
L
f
p
(7)
(
)
2
Z =
R
+
XL
XC
-
(8)
OUTPEAK
CLASSDPEAK
V
I
=
Z
(9)
RESISTOR – SPEAKER LOAD CONFIGURATION
www.ti.com ........................................................................................................................................................................................... SLOS595 – DECEMBER 2008
Figure 16. Application Schematic with Resistor – Speaker – Inductor Load Configuration
For the resistor – speaker – inductor load configuration, it is desired to make the output load configuration
overdamped (Zeta (
ζ) > 0.707). Use Equation 4 to calculate ζ:
If
ζ is greater than one, then the maximum audio frequency will be limited by the resistor – speaker capacitance
low pass filter as shown in Equation 5.
Calculate equivalent load impedance with Equation 6, through Equation 9.
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.
This load configuration is similar to the resistor – speaker – resistor load configuration. Apply the same equations
here to calculate the maximum audio frequency and maximum required current from the class-D audio amplifier.
Copyright 2008, Texas Instruments Incorporated
11
Product Folder Link(s): TPA2100P1
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