Datasheet

MAX9708
20W/40W, Filterless, Spread-Spectrum,
Mono/Stereo, Class D Amplifier
7
Maxim Integrated
EFFICIENCY vs. OUTPUT POWER
MAX9708 toc15
OUTPUT POWER (W)
EFFICIENCY (%)
5040302010
20
30
40
50
60
70
80
90
100
10
060
PV
DD
= 18V,
4Ω MONO MODE
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9708 toc17
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
1086
10
20
30
40
50
60
0
412
MONO MODE,
10% THD+N,
PV
DD
= 18V
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9708 toc18
LOAD RESISTANCE (Ω)
OUTPUT POWER PER CHANNEL (W)
111098
5
10
15
20
25
30
0
712
STEREO MODE,
10% THD+N,
PV
DD
= 18V
MUTE RESPONSE
MAX9708 toc19
40ms/div
MUTE
5V/div
OUTPUT
50mV/div
SHUTDOWN RESPONSE
MAX9708 toc20
40ms/div
SHDN
5V/div
OUTPUT
50mV/div
Typical Operating Characteristics (continued)
(PV
DD
= V
DD
= +18V, PGND = GND = 0V, C
SS
= 0.47µF, C
REG
= 0.01µF, C1 = 0.1µF, C2 = 1µF, R
LOAD
= , SHDN = high, MONO
= low, MUTE = high, G1 = low, G2 = high, FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (R
L
) are between OUT_+ and
OUT_-, T
A
= +25°C, unless otherwise stated.)