EV7747DQ-00A –2X20W STEREO SINGLE ENDED CLASS D AUDIO AMPLIFIER EVALUATION BOARD
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.
EV7747DQ-00A Rev. 1.0
www.MonolithicPower.com
6
1/5/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
QUICK START GUIDE
This board is set up from the factory for 24V operation. To use with 36V (12V) power supply, adjust the
components as specified in the 36V (12V) Operation Modifications section below. For more information,
consult the MP7747 datasheet.
Figure 5—EV7747DQ-00A Connection Diagram
1. Power Requirements
a. Power supply: 9.5V to 36V, 4.5A maximum.
b. 0V to 1.5VRMS (max) audio signal source.
c. Speaker: typically 4
Ω
to 8
Ω
;
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.
c. Connect the power supply to the VDD terminals.
d. Set the enable switch to the DISABLE position.
e. Connect the audio input signal source to the amplifier inputs (CN2, CN3).
f. Turn on the power supply.
3. 36V Operation Modifications
a. Change C6 to 8.2nF and C7 to 6.8nF.
b. Change R7 & R11 to 64.9k
Ω
to set 30V VDD shutdown voltage.
c. Adjust the power supply to 36V (do not turn on).
d. Do as step b~f specified in Section 2.
4. 12V Operation Modifications
a. Change C6 to 3.3nF and C7 to 2.2nF.
b. Change R7 & R11 to 15k
Ω
to set 10V VDD shutdown voltage.
c. Remove R18 to make sure EN signal is high enough @ 12V VDD.
d. Adjust the power supply to 12V (do not turn on).
e. Do as step b~f specified in Section 2.
5. Music Turn-On Sequence
Set the enable switch to the ENABLE position.
6. Music Turn-Off Sequence
a. Set the enable switch to the DISABLE position.
b. Turn off the power supply.