MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER
FUNCTIONAL BLOCK DIAGRAM
Power Supply
1
10
6
VIN
CLK
PVIN
5
SHDN
FREQUENCY
SELECT
OSC
PLL
Control Logic UVLO
PVIN
--
+
R3
U2
R1
2
3
INP
PGND
PVIN
8
9
OUTP
OUTN
+
--
+
U1
LOGIC
INN
--
R2
+
--
U3
R4
PGND
MP1720
START UP OTP
OCP
PGND
DGND
7
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Figure 1—MP1720 Functional Block Diagram
TYPICAL PERFORMANCE CHARACTERISTICS
TEST SET-UP GRAPH
10uF
68nF
0.1uF
0.1uF
33nF
33nF
VIN
PVIN
OUTN
OUTP
PGND
CLK
22ohm
1uF
1uF
load
-
Measurement +
INP
15uH
15uH
Measurement
Input
0.15uF
MP1720
Output
-
INN
+
22ohm
68nF
DGND
SHDN
Notes:
6) The 70kHz low-pass filter is required even if the analyzer has a low-pass filter.
7) For PSRR test, Please remove the 10uF decoupling capacitor and just keep the small decoupling capacitors for recovery switching
currents.
8) CIN was shorted for any Common-Mode input voltage measurement.
MP1720 Rev. 1.01
8/9/2012
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