max98400a Maxim Integrated Products, Inc., max98400a Datasheet - Page 15

• Manufacturer Part Number: max98400a
• Description: Stereo, High-power, Class D Amplifiers
• Manufacturer: Maxim Integrated Products, Inc.

The MAX98400A/MAX98400B Class D amplifiers pro-
vide high-performance, thermally efficient amplifier solu-
tions. The MAX98400A delivers 2x20W into 8I loads or
1x40W into a 4I load. The MAX98400B delivers 2x12W
into 8I loads.
An integrated limiting circuit prevents output clipping
distortion and protects small speakers from transient
voltages.
A thermal-foldback feature can be enabled to automati-
cally reduce the output power if the supply voltage, input
signal, and/or ambient temperature are too high to oper-
ate within a junction temperature of +130NC. Traditional
INPUT
RIGHT
INPUT
LEFT
1µ F
1µ F
1µ F
1µ F
C
C
C
C
IN
IN
IN
IN
Stereo, High-Power, Class D Amplifiers
Detailed Description
TEMPLOCK
V
S
MONO
INR+ 17
INL+
INR- 16
INL-
1.0µ F
C
13
11
12
19
2
LIM_TH
V
CLIPPING
CLIPPING
6
S
LIMITER
LIMITER
10
1.0µ F
REGULATOR
CONTROL
LIMITER
C
1
8V TO 28V
20
RELEASE
C
1.0 µ F
REL
31, 32, 33
PVDD
FOLDBACK
THERMAL
PGA
PGA
G1
C
200µ F
SELECTION
8
BULK
GAIN
Mono Configuration for MAX98400A
thermal protection is also available in addition to robust
overcurrent protection.
Both devices operate from an 8V to 28V supply and pro-
vide a high 67dB PSRR, eliminating the need for a regu-
lated power supply. They offers up to 90% efficiency
from a 12V supply.
Filterless modulation allows the ICs to pass EN55022B
EMI limits with 1m cables using only a low-cost fer-
rite bead and small-value capacitor on each output
(Figure 1).
Comprehensive click-and-pop reduction circuitry mini-
mizes noise coming into and out of shutdown.
9
G2
SHDN
WITH THERMAL
OVERCURRENT
MAX98400A
PROTECTION
OSCILLATOR
ENABLE
21
BIAS AND
POWER
STAGE
AND
14, 15
GND
29, 30,
34, 35
PGND
23, 24
26, 27
4, 5
1, 2
OUTL+
OUTL-
OUTR+
OUTR-
15