MP7752 – 18V, 2X15W STEREO FIX FREQUENCY INDUCTORLESS BTL CLASS D AUDIO AMPLIFIER

MP7752 Rev. 1.01

www.MonolithicPower.com

18

5/27/2016

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Electro-Magnetic Interference (EMI)

Considerations

Due to the switching nature of Class D

amplifiers, care must be taken to minimize the

effects of electromagnetic interference from the

amplifier. However, proper component selection

and careful attention to circuit layout can

minimize the effects of the EMI due to the

amplifier switching.

The magnetic beads are used for blocking

radiated emissions from SW nodes. For the

best EMI performance, use high current and

high impedance magnetic bead. muRata

NFZ2M series CLASS D EMI filter has been

tested work well in series with PVCC and four

SW outputs.

The size of high-current loops that carry rapidly

changing currents must be minimized: Make

close to the MP7752 as possible.

Nodes that carry rapidly changing voltage, such

as SW, need to be made as small as possible.

If sensitive traces run near a trace connected to

SW, place a ground shield between the traces.

MP7752 EVB passed CISPR22 CLASS B

standard with stereo full power output.

Figure 4: EMI Test Data of MP7752 EVB

Test Condition: 10 meter EMI chamber, 1.2 meter twist speaker cable, MP7752 EVB stereo test.