EV0041

MP8040

Full Bridge or Single Ended

Audio Amplifier

EVALUATION BOARD

EV0041 Rev 1.4_8/1/05

Monolithic Power Systems, Inc.

4

Monolithic Power Systems

Operation

1.

The EV0041 comes configured as a stereo single ended audio amplifier (EV0041A).

2.

To configure the board as a full bridge circuit (EV0041B), short R4, R7, R9, remove C4, C7 and

stuff C12 with a 0.47

µF capacitor.

3.

Connect the audio inputs to the IN pins as shown in Figure 5.

4.

Connect speakers to pins 1-4 as shown in Figure 5 for single ended configuration. Use pins 2 and

3 for bridged circuit.

5.

6.

SHDN enables/disables the MP8040. Drive SHDN low to turn on the MP8040, drive it high to turn

it off. If not used connect SHDN to GND.

7.

A low output at FLT indicates that the MP8040 has detected a fault and has shutdown.

8.

The DR pin is an optional fixed 5V voltage output capable of driving a 1mA load for external

circuitry.

Figure 5: Top Side Evaluation Board Diagram

Single

Ended

Outputs

-

+

+

-

Power Supply

GND

Right

Channel

Left

Channel

Left

Channel

Right

Channel

IN

SHDN

FLT

DR

GND

Bridge

Outputs

1

2

3

4

IN

SHDN

FLT

DR

GND