MP7731DF datasheet(5/9 Pages) MPS

5 / 9 page

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

MP7731 Rev. 1.8

www.MonolithicPower.com

9/25/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

PIN FUNCTIONS

Pin #

Name

Description

1, 5, 11, 16

No Connect – Not internally connected

PIN1

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.

NIN1

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

1. See Figure 1.

AGND1

Analog Ground 1. Connect AGND1 to AGND2.

EN1

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

low to disable.

NIN2

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

2. See Figure 1.

PIN2

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.

AGND2

Analog Ground 2. Connect AGND2 to AGND1.

EN2

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

low to disable.

BS2

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.

VDD2

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.

SW2

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

pin. See Figure 1.

PGND2

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

BS1

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.

VDD1

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.

SW1

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

pin. See Figure 1.

PGND1

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

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