MP7731DF データシートの表示（PDF） - Monolithic Power Systems

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MP7731DF

5W - 30W Class D Mono Bridged Audio Amplifier

Monolithic Power Systems 

MP7731 – 5W – 30W CLASS D MONO BRIDGED AUDIO AMPLIFIER

PIN FUNCTIONS

Pin # Name

1, 5, 11, 16

2

NC

PIN1

3

NIN1

4

AGND1

6

EN1

7

NIN2

8

PIN2

9

AGND2

10

EN2

12

BS2

13

VDD2

14

SW2

15

PGND2

17

BS1

18

VDD1

19

SW1

20

PGND1

Description

No Connect – Not internally connected

Amplifier 1 Positive Input. PIN1 is the positive side of the differential input to Amplifier 1.

Use a resistive voltage divider to set the voltage at PIN1 to VDD/2. See Figure 1.

Amplifier 1 Negative Input. NIN1 is the negative side of the differential input to Amplifier

1. See Figure 1.

Analog Ground 1. Connect AGND1 to AGND2.

Enable Input 1. EN1 must be connected to EN2. Drive high to enable MP7731, drive

low to disable.

Amplifier 2 Negative Input. NIN2 is the negative side of the differential input to Amplifier

2. See Figure 1.

Amplifier 2 Positive Input. PIN2 is the positive side of the differential input to Amplifier 2.

Use a resistive voltage divider to set the voltage at PIN2 to VDD/2. See Figure 1.

Analog Ground 2. Connect AGND2 to AGND1.

Enable Input 2. EN2 must be connected to EN1. Drive high to enable MP7731, drive

low to disable.

High-Side MOSFET Bootstrap Input for Amplifier 2. A capacitor from BS2 to SW2

supplies the gate drive current to the internal high-side MOSFET. Connect a 1µF

capacitor from SW2 to BS2. See Figure 1.

Power Supply Input. Bypass VDD2 to PGND2 with a 1µF X7R capacitor (in addition to

the main bulk capacitor), placed close to the IC PIN13 and PIN15.

Switched Power Output. SW2 is the output of Amplifier 2. Connect the LC filter to this

pin. See Figure 1.

Power Ground for Amplifier 2. Connect PGND2 to PGND1. See Figure 1.

High-Side MOSFET Bootstrap Input for Amplifier 1. A capacitor from BS1 to SW1

supplies the gate drive current to the internal high-side MOSFET. Connect a 1µF

capacitor from SW1 to BS1. See Figure 1.

Power Supply Input. Bypass VDD1 to PGND1 with a 1µF X7R capacitor (in addition to

the main bulk capacitor), placed close to the IC PIN18 and PIN20.

Switched Power Output. SW1 is the output of Amplifier 1. Connect the LC filter to this

pin. See Figure 1.

Power Ground for Amplifier 1. Connect PGND1 to PGND2. See Figure 1.

MP7731 Rev. 1.8

www.MonolithicPower.com

5

9/25/2006

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© 2006 MPS. All Rights Reserved.

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