MP7720 – 20W CLASS D MONO SINGLE ENDED AUDIO AMPLIFIER

MP7720 Rev. 1.9

www.MonolithicPower.com

3

3/13/2006

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© 2006 MPS. All Rights Reserved.

OPERATING SPECIFICATIONS

Parameters

Symbol Condition

Min

Typ

Max

Units

Standby Current

130

µA

Quiescent Current

13

mA

f = 1KHz, THD+N = 10%,

4Ω Load

20

W

Power Output

f = 1KHz, THD+N = 10%,

8Ω Load

10

W

Load

0.08

%

THD+ Noise

Load

0.04

%

Load

90

%

Efficiency

Load

95

%

Maximum Power Bandwidth

20

KHz

Dynamic Range

93

dB

Noise Floor

A-Weighted

190

µV

Power Supply Rejection

f = 1KHz

60

dB

PIN FUNCTIONS

Pin #

Name Description

1

PIN

Amplifier Positive Input. PIN is the positive side of the differential input to the amplifier. Use a

2

NIN

Amplifier Negative Input. NIN is the negative side of the differential input to the amplifier. Drive

the input signal and close the feedback loop at NIN. See Figure 1.

3

AGND Analog Ground. Connect AGND to PGND at a single point.

4

EN

Enable Input. Drive EN high to turn on the amplifier, low to turn it off.

5

BS

High-Side MOSFET Bootstrap Input. A capacitor from BS to SW supplies the gate drive

current to the internal high-side MOSFET. Connect a 0.1µF capacitor from SW to BS. Place a

6.2V zener diode from BS to SW to prevent overstressing of the internal circuitry.

6

VDD

Power Supply Input. VDD is the drain of the high-side MOSFET switch, and supplies the

power to the output stage and the MP7720 internal control circuitry. In addition to the main

bulk capacitor, bypass VDD to PGND with a 1µF X7R capacitor placed close to pins 6 and 8.

7

SW

Switched Power Output. SW is the output of the MP7720. Connect the LC filter between SW

and the output coupling capacitor. See Figure 1.

8

PGND Power Ground. Connect PGND to AGND at a single point.