Datasheet
MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
34 ______________________________________________________________________________________
MAX9742
-
+
V
MID
+ 5V
V
DD
V
SS
20V TO 40V
R
IN1
30.1kΩ
R
IN2
30.1kΩ
C
IN
0.47µF
C
IN
0.47µF
V
MID
- 5V
V
SS
V
MID
- 5V
C
FBL1
150pF
POSITIVE
AUDIO INPUT
NEGATIVE
AUDIO INPUT
+
-
V
MID
+ 5V
C
FBR1
150pF
R
IN2
30.1kΩ
R3
10kΩ
V
DD
R
IN1
30.1kΩ
C
IN
0.47µF
C
IN
0.47µF
V
MID
- 5V
R
F2
681kΩ
8
9
FBL
FBR
19
SHDN
OFF
ON
17
SFT LGND SUB
14 15 4
31, 32, 33
V
SS
7
INL-
INL+
11 MID
21
20
INR+
INR-
C
FBR1
150pF
R
F2
681kΩ
C
MID2
10µF
C
MID1
10µF
R1
10kΩ
R2
10kΩ
CLASS D
MODULATOR AND
HALF-BRIDGE
V
DD
V
SS
CLASS D
MODULATOR AND
HALF-BRIDGE
CONNECT PGND AND SGND TO
A SINGLE POINT ON THE PCB
NEAR THE MAX9742
7V REGULATOR
(WITH RESPECT
TO V
SS
)
CURRENT
REFERENCE
-5V REGULATOR
(WITH RESPECT TO V
MID
)
V
MID
+ 5V
5V REGULATOR
(WITH RESPECT TO V
MID
)
OPTIONAL
5V SUPPLY
CONTROL LOGIC/
POWER-UP
SEQUENCING
C
FBL1
150pF
R
F1a
121kΩ
R
F1b
562kΩ
10
12
REGM
REGP
2, 3
OUTL
C
F
0.68µF
5
BOOTL
13
REFCUR
29, 30, 34, 35
V
DD
C
REGP
1µF
L
F
22µH
L
F
22µH
C
BOOT
0.1µF
D
BOOT
1N4148
R
REF
68kΩ
C
REGM
1µF
C
FBL2
10pF
CV
DD
330µF
0.1µF
CV
DD
330µF
16
LV
DD
C
LVDD
0.1µF
22
NSENSE
23
REGLS
OPTIONAL
R
F1a
121kΩ
R
F1b
562kΩ
C
FBR2
10pF
C
SFT
0.47µF
C
ZBL
0.82µF
C
ZBL
0.82µF
R
ZBL
5Ω
R
ZBL
5Ω
25, 26
OUTR
C
F
0.68µF
24
BOOTR
8Ω
C
BOOT
0.1µF
C
REGLS
1µF
D
BOOT
1N4148
= SGND
= PGND
BRIDGE-TIED-LOAD (BTL), SINGLE-SUPPLY OPERATION
DEVICE CONNECTED FOR A
V
= 44V/V.
Typical Application Circuits/Functional Diagrams (continued)