max9744 Maxim Integrated Products, Inc., max9744 Datasheet - Page 9

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

(V
OUT_+ and OUT_- with an inductor in series, 8Ω load, L = 68µH, 4Ω load, L= 33µH. R
C
IN
PVDD
125
100
= 0.47µF, R
16
12
75
50
25
8
4
0
0
4
0
OUTPUT POWER vs. SUPPLY VOLTAGE
= 12V, V
R
f
PWM MODE
f
R
IN
IN
L
L
PVDD = 12V
PWM MODE
= 8Ω
= 1kHz
= 1kHz
= 4Ω
PVDD = 14V
FILTERLESS MODULATION
3
6
CASE TEMPERATURE
vs. OUTPUT POWER
-100
IN
-10
-20
-30
-40
-50
-60
-70
-80
-90
DD
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
0
6
= 20kΩ, R
POWER-SUPPLY REJECTION RATIO (V
10
= 3.3V, V
8
_______________________________________________________________________________________
PVDD = 14V
PWM MODE
V
V
THD+N = 10%
PVDD = 12V
FILTERLESS MODULATION
DD
RIPPLE
9
= 3.3V
10
20W Stereo Class D Speaker Amplifier
= 100mV
100
PWM MODE
THD+N = 1%
F_
12
GND
vs. FREQUENCY
FREQUENCY (Hz)
= 20kΩ, spread-spectrum mode, T
P-P
12
FILTERLESS MODULATION
= V
15
1k
PGND
14
18
10k
= 0V, V
Typical Operating Characteristics (continued)
20
16
12
75
50
25
8
4
0
0
DD
MUTE
100k
0
0
OUTPUT POWER vs. LOAD RESISTANCE
)
f
R
IN
L
THD+N = 1%
= 1kHz
= 8Ω
PVDD = 12V
PWM MODE
PVDD = 14V
FILTERLESS MODULATION
= 0V; max volume setting; all speaker load resistors connected between
5
2
CASE TEMPERATURE
THD+N = 10%
vs. OUTPUT POWER
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
10
4
A
PVDD = 12V
f = 1kHz
FILTERLESS MODULATION
PVDD = 12V
FILTERLESS MODULATION
= +25°C, unless otherwise noted.)
15
6
PVDD = 14V
PWM MODE
20
8
with Volume Control
25
10
40
35
30
25
20
15
10
5
30
12
30
L
= ∞, unless otherwise stated, C
EMI WITH FERRITE BEAD FILTERS
(V
60
DD
EN5022 B LIMIT
80
= 12V, 1m CABLE, 8Ω LOAD)
-100
100
-10
-20
-30
-40
-50
-60
-70
-80
-90
4
3
2
1
0
0
120
FREQUENCY (MHz)
POWER-SUPPLY REJECTION RATIO (PVDD)
10
0
OUTPUT POWER vs. LOAD RESISTANCE
140
PVDD = 12V
V
THD+N = 1%
RIPPLE
160
5
180
= 200mV
THD+N = 10%
100
200
LOAD RESISTANCE (Ω)
vs. FREQUENCY
10
PWM MODE
220
FREQUENCY (Hz)
P-P
240
FILTERLESS MODULATION
260
15
1k
280
300
BIAS
20
PVDD = 5V
f = 1kHz
PWM MODE
10k
= 2.2µF,
25
100k
30
9