EV7745DF-01A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVB

NOTICE:

The information in this document is subject to change without notice. Please contact MPS for current specifications.

Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS

products into any application. MPS will not assume any legal responsibility for any said applications.

EV7745DF-01A Rev. 1.0

www.MonolithicPower.com

6

10/19/2011

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

QUICK START GUIDE

This board set up from the factory for 24V operation. To use with a 12V power supply, adjust the

components as specified in the 12V Operation Modifications section below. For more information,

consult the MP7745 datasheet.

MPS

MP7745 Demo Board

EV7745DF-01A

IN1

IN2

For VDD=12V

Remove R6

EXT-ENABLE

EXT-EN

GND

GND

Figure 5—EV7745DF-01A Connection Diagram

1. Power Requirements

a. Power supply: 9.5V to 26V, 3.5A maximum.

c. Speaker: 4Ω to 8Ω.

2. Setup Condition for 24V Operation

a. Adjust the power supply to 24V (do not turn on).

b. Connect the outputs to the external speakers.

d. Set the enable switch to the DISABLE position.

e. Connect the audio input signal source to the amplifier inputs (IN1, IN2).

f. Turn on the power supply to apply power to the board.

3. 12V Operation Modifications

a. Change C6 to 3.3nF and C15 to 2.2nF components.

b. Remove R6 from the demo board.

c. Adjust the power supply to 12V (do not turn on).

d. Do as step b~f specified in Section 2.

4. Music Turn-On Sequence

a. Set the enable switch to the ENABLE position.

5. Music Turn-Off Sequence

a. Set the enable switch to the DISABLE position.

b. Turn off power supply.