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APPLICATIONINFORMATION
APPLICATIONCIRCUIT
INN
INP
GAIN0
关闭
PGND
VCLAMP
BSN
PV
CC
OUTN
OUTN
PGND
V
CC
VREF
绕过
COSC
ROSC
AGND
AGND
BSP
PV
CC
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
Ω
C9
0.22
µ
F
C6
1
µ
F
D1
V
CC
C12
220 pf
C11
1
µ
F
C3
1
µ
F
C4
1
µ
F
V
CC
L2
(ferrite
bead)
L1
(ferrite
bead)
C15
1 nf
C14
1 nf
D2
R2
51
Ω
C8
0.22
µ
F
C5
1
µ
F
C7
10
µ
F
C10
1
µ
F
C1
0.47
µ
F
C2 0.47
µ
F
IN−
IN+
增益 选择
增益 选择
关闭
控制
U1
TPA3007D1
l1, l2: fair-rite, 部分 号码 2512067007y3
d1, d2: 二极管, inc., 部分 号码 b130
V
CC
R1
120 k
Ω
类-doperation
traditionalclass-dmodulationscheme
TPA3007D1
SLOS418A–SEPTEMBER2003–REVISEDDECEMBER2004
figure13.typicalapplicationcircuit
thissectionfocusesontheclass-doperationofthetpa3007d1.
thetraditionalclass-dmodulationscheme,whichisusedinthetpa032d0xfamily,hasadifferentialoutput
whereeachoutputis180degreesoutofphaseandchangesfromgroundtothesupplyvoltage,v
CC
.因此,
thedifferentialprefilteredoutputvariesbetweenpositiveandnegativeV
CC
,wherefiltered50%dutycycleyields0
vacrosstheload.thetraditionalclass-dmodulationschemewithvoltageandcurrentwaveformsisshownin
figure14.notethatevenatanaverageof0vacrosstheload(50%dutycycle),thecurrenttotheloadishigh,
causinghighloss,thuscausingahighsupplycurrent.
10