Typical operating characteristics (continued) – Rainbow Electronics MAX9768 User Manual
Page 8
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
8
_______________________________________________________________________________________
EFFICIENCY vs. OUTPUT POWER
MAX9768 toc13
OUTPUT POWER (W)
EFFICIENCY (%)
10
4
6
8
2
20
10
30
50
40
60
100
80
70
90
0
0
PWM MODE
PV
DD
= 12V
f
IN
= 1kHz
R
L
= 8
Ω
FILTERLESS MODULATION
EFFICIENCY vs. OUTPUT POWER
MAX9768 toc14
OUTPUT POWER (W)
EFFICIENCY (%)
2.0
1.0
1.5
0.5
20
10
30
50
40
60
100
80
70
90
0
0
PWM MODE
FILTERLESS MODULATION
PV
DD
= 5V
f
IN
= 1kHz
R
L
= 8
Ω
EFFICIENCY vs. SUPPLY VOLTAGE
MAX9768 toc15
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
14.5
8.5
10.5
12.5
6.5
83
86
89
95
92
80
4.5
THD+N = 10%
THD+N = 1%
f
IN
= 1kHz
R
L
= 8
Ω
FILTERLESS MODULATION
EFFICIENCY vs. SUPPLY VOLTAGE
MAX9768 toc16
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
14.5
8.5
10.5
12.5
6.5
83
86
89
95
92
80
4.5
f
IN
= 1kHz
R
L
= 8
Ω
PWM MODULATION
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9768 toc17
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
14
8
10
12
6
2
4
6
8
14
12
10
0
4
R
L
= 8
Ω
f
IN
= 1kHz
PWM MODE
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9768 toc18
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
14
8
10
12
6
2
4
6
8
12
10
0
4
R
L
= 4
Ω
f
IN
= 1kHz
PWM MODE
THD+N = 1%
THD+N = 10%
OUTPUT POWER vs. LOAD RESISTANCE
MAX9768 toc19
LOAD RESISTANCE (
Ω)
OUTPUT POWER (W)
30
10
15
25
20
5
2
4
6
8
12
10
0
0
PV
DD
= 12V
f = 1kHz
PWM MODE
THD+N = 1%
THD+N = 10%
OUTPUT POWER vs. LOAD RESISTANCE
MAX9768 toc20
LOAD RESISTANCE (
Ω)
OUTPUT POWER (W)
30
10
15
25
20
5
0.5
1.0
1.5
2.5
2.0
3.5
3.0
0
0
PV
DD
= 5V
f = 1kHz
PWM MODE
THD+N = 1%
THD+N = 10%
Typical Operating Characteristics (continued)
(PV
DD
= 12V, V
DD
= 3.3V = GND = PGND = 0V, V
MUTE
= 0V; 0dB volume setting; all speaker load resistors connected between
OUT+ and OUT-, R
L
= 8
Ω, unless otherwise noted. C
BIAS
= 2.2µF, C1 = C2 = 0.1µF, C
IN
= 0.47µF, R
IN
= 20kΩ, R
FB
= 30k
Ω,
spread-spectrum modulation mode.)
CASE TEMPERATURE vs. OUTPUT POWER
MAX9768 toc21
OUTPUT POWER (W)
CASE TEMPERATURE (
°C)
12
4
6
10
8
2
10
30
20
40
50
70
60
90
80
0
0
f
IN
= 1kHz
R
L
= 8
Ω
PV
DD
= 14V
PV
DD
= 12V