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 (fCLK=1.0MHz), signal frequency
fs=1kHz, Gain=12dB, TA = +25C, unless otherwise noted (6,7,8)
.
Efficiency vs. P
VIN=3.3V
Efficiency vs. P
VIN=5V
OUT
OUT
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
+0
-10
-20
-30
-40
-50
-60
-70
-80
20
50 100 200 500 1k 2k
5k 10k 20k
0
0.4
0.8
OUT(W)
1.2
0
0.4 0.8 1.2 1.6
POUT(W)
2
2.4 2.8
P
FREQUENCY (Hz)
Efficiency vs. CLK Frequency
VIN=5V, THD+N=1%
Efficiency vs. CLK Frequency
VIN=3.3V, THD+N=1%
100
100
90
80
70
60
50
40
30
20
10
0
2
1.8
1.6
1.4
1.2
1
90
80
70
60
50
40
30
20
10
0
THD+N=10%
THD+N=1%
0.8
0.6
0.4
0.2
0
500
700 900 1100 1300
CLK FREQUENCY(kHz)
500 700
900 1100 1300
2.5
3.5
4.5
5.5
CLK FREQUENCY(kHz)
VIN(V)
3
1.4
1.2
1
2.5
2
THD+N=10%
0.8
0.6
0.4
0.2
0
SHDN
2V/div
1.5
1
I
THD+N=1%
LOAD
100mA/div
0.5
0
2.5
0
0.5
1
1.5
2
2.5
3.5
4.5
5.5
COMMON MODE VOLTAGE (V)
VIN(V)
MP1720 Rev. 1.01
8/9/2012
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