Datasheet

MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
32 ______________________________________________________________________________________
Typical Application Circuits/Functional Diagrams
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
FBL
150pF
LEFT POSITIVE
AUDIO INPUT
LEFT 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
RIGHT NEGATIVE
AUDIO INPUT
RIGHT POSITIVE
AUDIO INPUT
R
F2
681kΩ
8
9 FBL
FBR
19
SHDN
OFF
ON
17
SFT LGND SUB
14 15 4
31, 32, 33
SINGLE-SUPPLY OPERATION DEVICE CONNECTED FOR A
V
= 22V/V
V
SS
7
INL- INL+
11 MID 21 20
INR+ INR-
C
FBR
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
0.33µF
5
BOOTL
13
REFCUR
29, 30, 34, 35 V
DD
C
REGP
1µF
L
F
47µH
L
F
47µH
C
OUT
1000µF
C
BOOT
0.1µF
D
BOOT
1N4148
R
REF
68kΩ
C
REGM
1µF
C
FBL2
10pF
C
VDD
330µF
C
VDD
330µF
0.1µF
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
0.47µF
R
ZBL
10Ω
25, 26
OUTR
C
F
0.33µF
24
BOOTR
C
OUT
1000µF
8Ω 8Ω
C
BOOT
0.1µF C
REGLS
1µF
C
ZBL
0.47µF
R
ZBL
10Ω
D
BOOT
1N4148
= SGND = PGND