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TPA3007D1PWR データシート(PDF) 10 Page - Texas Instruments

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部品番号 TPA3007D1PWR
部品情報  6.5-W MONO CLASS-D AUDIO POWER AMPLIFIER
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

TPA3007D1PWR データシート(HTML) 10 Page - Texas Instruments

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APPLICATION INFORMATION
APPLICATION CIRCUIT
INN
INP
GAIN0
SHUTDOWN
PGND
VCLAMP
BSN
PVCC
OUTN
OUTN
PGND
VCC
VREF
BYPASS
COSC
ROSC
AGND
AGND
BSP
PVCC
OUTP
GAIN1
OUTP
PGND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
R3
51
C9
0.22
µF
C6
1
µF
D1
VCC
C12
220 pF
C11
1
µF
C3
1
µF
C4
1
µF
VCC
L2
(Ferrite
Bead)
L1
(Ferrite
Bead)
C15
1 nF
C14
1 nF
D2
R2
51
C8
0.22
µF
C5
1
µF
C7
10
µF
C10
1
µF
C1
0.47
µF
C2
0.47
µF
IN−
IN+
GAIN SELECT
GAIN SELECT
SHUTDOWN
CONTROL
U1
TPA3007D1
L1, L2: Fair-Rite, Part Number 2512067007Y3
D1, D2: Diodes, Inc., Part Number B130
VCC
R1
120 k
CLASS-D OPERATION
TRADITIONAL CLASS-D MODULATION SCHEME
TPA3007D1
SLOS418A – SEPTEMBER 2003 – REVISED DECEMBER 2004
Figure 13. Typical Application Circuit
This section focuses on the class-D operation of the TPA3007D1.
The traditional class-D modulation scheme, which is used in the TPA032D0x family, has a differential output
where each output is 180 degrees out of phase and changes from ground to the supply voltage, VCC. Therefore,
the differential prefiltered output varies between positive and negative VCC, where filtered 50% duty cycle yields 0
V across the load. The traditional class-D modulation scheme with voltage and current waveforms is shown in
Figure 14. Note that even at an average of 0 V across the load (50% duty cycle), the current to the load is high,
causing high loss, thus causing a high supply current.
10


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