EV7740DN-01B – 15W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER
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.
EV7740DN-01B Rev. 1.0
www.MonolithicPower.com
5
10/19/2011
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
QUICK START GUIDE
1. This board set up from the factory for 24V operation. To use with 36V power supply, adjust the
components as specified in the 36V Operation Modifications section below. To use with 12V
power supply, adjust the components as specified in the 12V Operation Modifications section
below. For more information, consult the MP7740 datasheet.
2. Power Requirements
a. Power supply: 9.5V to 36V, 3A maximum.
b. 0V to 1.5V
RMS
(max) audio signal source.
c. Speaker: 4
Ω
to 8
Ω
(for 12 V and 24V operation). 6
Ω
to 8
Ω
(for 36V operation)
3. Setup Condition for 24V Operation
a. Adjust the power supply to 24V (do not turn on).
b. Connect the outputs to the external speakers.
c. Connect the power supply to the V
DD
terminals.
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.
4. 36V Operation Modifications
a. Change C6 to 8.2nF and C7 to 6.8nF components.
b. Adjust the power supply to 36V (do not turn on).
c. Select 6
Ω
to 8
Ω
speaker.
d. Do as step b~f specified in Section 3.
5. 12V Operation Modifications
a. Change C6 to 3.3nF and C7 to 2.2nF components.
b. Remove R18 from the demo board.
c. Adjust the power supply to 12V (do not turn on).
d. Do as step b~f specified in Section 3.
6. Music Turn-On Sequence
Set the enable switch to the ENABLE position.
7. Music Turn-Off Sequence
a. Set the enable switch to the DISABLE position.
b. Turn off power supply.