MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER
TYPICAL PERFORMANCE CURVES
(continued)
VIN = PVIN = SHDN =3.3V, DGND = PGND = 0V, CLK = DGND (f
CLK
=1.0MHz), signal frequency
f
s
=1kHz, Gain=12dB, T
A
= +25
C, unless otherwise noted
(6,7,8)
.
VIN=3.3V
+0
-10
-20
Efficiency vs. P
OUT
100
90
80
Efficiency vs. P
OUT
VIN=5V
100
90
80
EFFICIENCY(%)
-30
-40
-50
-60
-70
-80
20
50 100 200
500 1k
2k
5k 10k 20k
60
50
40
30
20
10
0
0
0.4
0.8
1.2
EFFICIENCY(%)
70
70
60
50
40
30
20
10
0
0
0.4 0.8 1.2 1.6
P
OUT
(W)
2
2.4 2.8
FREQUENCY (Hz)
P
OUT
(W)
Efficiency vs. CLK Frequency
VIN=5V, THD+N=1%
100
90
80
70
60
50
40
30
20
10
0
500
700
900 1100 1300
100
90
80
Efficiency vs. CLK Frequency
VIN=3.3V, THD+N=1%
2
1.8
1.6
1.4
THD+N=10%
EFFICIENCY(%)
EFFICIENCY(%)
70
50
40
30
20
10
0
500
700
900
1100
1300
P
OUT
(W)
60
1.2
1
0.8
0.6
0.4
0.2
0
2.5
3.5
VIN(V)
4.5
5.5
THD+N=1%
CLK FREQUENCY(kHz)
CLK FREQUENCY(kHz)
3
2.5
1.4
1.2
P
OUT
(W)
THD+N (%)
2
1.5
1
0.5
0
2.5
THD+N=10%
1
0.8
0.6
0.4
0.2
0
SHDN
2V/div
THD+N=1%
I
LOAD
100mA/div
3.5
VIN(V)
4.5
5.5
0
0.5
1
1.5
2
2.5
COMMON MODE VOLTAGE (V)
MP1720 Rev. 1.01
8/9/2012
www.MonolithicPower.com
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8
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