MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER

MP1720 Rev. 1.01

www.MonolithicPower.com

6

8/9/2012

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FUNCTIONAL BLOCK DIAGRAM

Control Logic

UVLO

SHDN

5

Power Supply

VIN

PVIN

1

10

INP

INN

OSC

PLL

FREQUENCY

SELECT

6

CLK

LOGIC

PVIN

PVIN

PGND

PGND

OUTP

OUTN

8

9

U2

--

+

U3

--

+

U1

--

+

--

+

R3

R4

R1

R2

2

3

START UP

OTP

OCP

PGND

DGND

74

MP1720

Figure 1—MP1720 Functional Block Diagram

TYPICAL PERFORMANCE CHARACTERISTICS

TEST SET-UP GRAPH

MP1720

VIN

INP

INN

DGND

SHDN

PVIN

PGND

OUTP

OUTN

CLK

+

-

Measurement

Output

+

-

Measurement

Input

load

1uF

1uF

0.1uF

0.1uF

10uF

15uH

15uH

33nF

33nF

0.15uF

22ohm

22ohm

68nF

68nF

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.