D2-24044 Datasheet, PDF (19/20 Pages) Intersil Corporation – Digital Audio Amplifier Power Stage

D2-24044
4-Channel Half-Bridge Example
This example (Figure 17) uses configuration mode “11”
to provide four independent half-bridge loudspeaker
output channels. The PWM controller provides input into
all eight PWM input pins.
nPDN
Configuration “11”
4x Half Bridge Outputs
PWMVDD/+3.3
10k 10k
nOVRT
PWM Inputs From
PWM/System Controller
PWMIN1-HI
PWMIN1-LO
PWMIN2-HI
PWMIN2-LO
PWMIN3-HI
PWMIN3-LO
PWMIN4-HI
PWMIN4-LO
Channel 1
Channel 2
Channel 3
Channel 3
For Channel 1 Output
For Channel 2 Output
For Channel 3 Output
For Channel 4 Output
nERROR Reporting to
PWM/System Controller
1 _nPDN
2
OCFG1
3
OCFG0
4
PWMGND
5
PWMVDD
6
nOVRT
7 _PWM1
8 _PWM2
9 _PWM3
10 _PWM4
11 _PWM5
12 _PWM6
13 _PWM7
14 _PWM8
15 _PWMGND2
16 _nERRORA
17 _nERRORB
18 _nERRORC
19 _nERRORD
38
HVDDA
37
HGNDA
OUTA ³⁶
35
HSBSA
34
HSBSB
33
OUTB
32
HGNDB
31
HVDDB
30
REG5V
29
VDDHV
28
IREF
27
HVDDC
26
HGNDC
25
OUTC
24
HSBSC
23
HSBSD
22
OUTD
21
HGNDD
20
HVDDD
D2-24044
+HV
GND
GND
+HV
100K
+HV
GND
GND
+HV
Half Bridge
+HV
Bias
Output
Filter
Channel 1
Half Bridge
+HV
Bias
Output
Filter
Channel 2
+HV
0.1u
1u
0.1u
Half Bridge
+HV
Bias
Output
Filter
Channel 3
Half Bridge
+HV
Bias
Output
Filter
Channel 4
FIGURE 17. 4-CHANNEL HALF BRIDGE EXAMPLE
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19
FN7678.0
September 3, 2010