EV7751-F-00A – 2X20W STEREO BTL FIX FREQUENCY CLASS D 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.

EV7751-F-00A Rev. 1.0

www.MonolithicPower.com

7

5/23/2014

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2014 MPS. All Rights Reserved.

APPLICATION INFORMATION

1. Typical Output Power vs. PLIMIT Voltage Table

Table 1: Power Limit Typical Operation

Test Condition

PLIMIT Voltage

Output Voltage (Vp-p)

Output Power

(~10% THD)

VDD=12V, Vin=1Vrms,

Load=8Ω, Gain=20dB

0.80V

14.9

5.0W

VDD=18V, Vin=1Vrms,

Load=8Ω, Gain=20dB

0.80V

14.9

5.0W

VDD=18V, Vin=1Vrms,

Load=8Ω, Gain=20dB

1.44V

23.6

10.0W

VDD=24V, Vin=1Vrms,

Load=8Ω, Gain=20dB

1.44V

23.6

10.0W

PLIMIT adjust methods:

a. Adjust resistor divider R8 and R9 to set PLIMIT reference voltage.

b. Short JP3 to connect PLIMIT pin to AVCC directly. (disable power limit function)

2. Voltage Gain Setting Table

Table 2: Gain Setting

GAIN0 GAIN1

Typical GAIN (dB)

Typical Input

Impedance (kΩ)

0

0

20

75

1

0

26

50

0

1

32

30

1

1

36

20

3. InAbsence Function

InAbsence function and its delay time are controlled by JP5 and C34.

a. Short JP5 to disable InAbsence function.

[ ]

=×

×

8

delay

R

T

1.6 10

C sec

For more information, please consult MP7751 datasheet.