D2-24044 Datasheet, PDF (18/20 Pages) Intersil Corporation – Digital Audio Amplifier Power Stage

D2-24044
2.1-Channel Example
This example (Figure 16) uses configuration mode “10”
to provide two independent half-bridge loudspeaker
output channels, plus one full-bridge loudspeaker output.
The PWM controller provides input into all eight PWM
input pins.
nPDN
Configuration “10”
2x Half Bridge Outputs, plus
1x Full Bridge Output
PWMVDD/+3.3
10k
10k
nOVRT
PWMIN1-HI
PWMIN1-LO
PWMIN2-HI
PWMIN2-LO
PWMIN3-HI
PWMIN3-LO
PWM Inputs From
PWM/System
Controller
Channel 1
Channel 2
Channel 3
(no connect)
(no connect)
For Channel 1 Output
For Channel 2 Output
For Channel 3 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
Half Bridge
HVDDA ³⁸ +HV
HGNDA ³⁷ GND
OUTA ³⁶
+HV
Bias
Output
Filter
35
HSBSA
Channel 1
34
HSBSB
Half Bridge
33
OUTB
HGNDB ³² GND
31
HVDDB
+HV
30
REG5V
+HV
Bias
Output
Filter
Channel 2
29
VDDHV
28
IREF
100K
+HV
0.1u
1u
27
0.1u
HVDDC
+HV
26
HGNDC
GND
25
OUTC
24
HSBSC
Full Bridge
23
HSBSD
22
OUTD
Output
Filter
HGNDD ^{21 GND}
Channel 3
HVDDD ²⁰ +HV
D2-24044
FIGURE 16. 2-CHANNEL HALF BRIDGE PLUS 1-CHANNEL FULL BRIDGE EXAMPLE
18
FN7678.0
September 3, 2010