max9744 Maxim Integrated Products, Inc., max9744 Datasheet - Page 8

• Manufacturer Part Number: max9744
• Description: 20w Stereo Class D Speaker Amplifier With Volume Control
• Manufacturer: Maxim Integrated Products, Inc.

0.001
20W Stereo Class D Speaker Amplifier
with Volume Control
(V
OUT_+ and OUT_- with an inductor in series, 8Ω load, L = 68µH, 4Ω load, L= 33µH. R
C
8
0.01
100
100
0.1
90
80
70
60
50
40
30
20
10
IN
10
PVDD
1
0
TOTAL HARMONIC DISTORTION PLUS NOISE
_______________________________________________________________________________________
= 0.47µF, R
10
0
PVDD = 12V
R
FILTERLESS MODULATION
P
L
OUT
EFFICIENCY vs. OUTPUT POWER
= 8Ω
= 12V, V
= 3W
0.5
100
100
OUTPUT POWER (W)
vs. FREQUENCY
1.0
FFM
FILTERLESS MODULATION
95
90
85
80
75
70
FREQUENCY (Hz)
IN
DD
4
= 20kΩ, R
f
R
PWM MODE
IN
= 3.3V, V
PWM MODE
EFFICIENCY vs. SUPPLY VOLTAGE
L
1.5
SSM
1k
= 1kHz
= 4Ω
6
2.0
SUPPLY VOLTAGE (V)
THD+N = 1%
10k
F_
THD+N = 10%
GND
PVDD = 5V
f
R
IN
L
8
MAX9744 toc20
= 20kΩ, spread-spectrum mode, T
2.5
= 1kHz
= 4Ω
= V
100k
3.0
10
PGND
2W
0W
12
= 0V, V
100
100
90
80
70
60
50
40
30
20
10
95
90
85
80
75
70
Typical Operating Characteristics (continued)
0
14
0
4
MUTE
f
R
FILTERLESS MODULATION
IN
L
EFFICIENCY vs. SUPPLY VOLTAGE
FILTERLESS MODULATION
EFFICIENCY vs. OUTPUT POWER
= 1kHz
= 4Ω
= 0V; max volume setting; all speaker load resistors connected between
PWM MODE
6
4
THD+N = 1%
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
PVDD = 12V, f
THD+N = 10%
8
A
8
= +25°C, unless otherwise noted.)
10
IN
= 1kHz, R
12
12
MAX9744 toc18
L
= 4Ω
24
20
16
12
8
4
0
16
14
4
OUTPUT POWER vs. SUPPLY VOLTAGE
10
9
8
7
6
5
4
3
2
1
0
L
f
R
PWM MODE
IN
L
= ∞, unless otherwise stated, C
= 1kHz
= 4Ω
6
SUPPLY VOLTAGE (V)
100
100
90
80
70
60
50
40
30
20
10
95
90
85
80
75
70
THD+N = 10%
0
8
0
4
FILTERLESS MODULATION
f
R
FILTERLESS MODULATION
IN
L
EFFICIENCY vs. SUPPLY VOLTAGE
EFFICIENCY vs. OUTPUT POWER
= 1kHz
= 8Ω
PWM MODE
10
2
6
THD+N = 1%
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
(PER CHANNEL)
12
THD+N = 10%
4
8
THD+N = 1%
14
10
6
BIAS
PVDD = 12V
f
R
IN
L
= 2.2µF,
12
= 1kHz
= 8Ω
8
MAX9744 toc19
10
14
5W
0W