EV7751-F-00A – 2X20W STEREO BTL FIX FREQUENCY CLASS D AUDIO AMPLIFIER EVB

EV7751-F-00A Rev. 1.0

www.MonolithicPower.com

6

5/23/2014

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QUICK START GUIDE

EV7751-F-00A is set up from the factory for 5V to 26V single supply operating voltage with single-

ended signal inputs. To use differential signal inputs, please remove the jumpers from JP2 and JP4.

IN1

IN2

SPK1+

SPK1-

SPK2+

SPK2-

VCC

GND

S1

JP2

JP4

JP3

GAIN0

GAIN1

EN

GND

FAULT

InAbsence GND

PLIMIT

MP7751 Demo Board

MPS

JP1

JP5

EV7751-F-00A

Figure 5—EV7751-F-00A Connection Diagram

1. Power, Signal and Load Impedance Requirements

a. Power supply: 5V to 26V (12V typical), 4A maximum (1.8A typical).

b. 0V to 2VRMS (max) audio signal source.

c. Speaker: typically 4Ω to 8Ω (8Ω typical).

2. Setup Condition for 12V Operation

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

b. Connect the outputs to the external speakers.

c. Connect the DC power supply to the power input terminals.

d. Set the voltage gain by GAIN0 and GAIN1 jumpers, default voltage gain=20dB.

e. Set the PLIMIT voltage to target output power level. Default setting is 1/2 AVCC, 2.75V

equivalent.

f. Connect the audio input signal source to the amplifier inputs (IN1 and IN2).

3. Music Turn-on/off Sequence

a. Push button S1 to disable this EVB, release S1 to enable (default position).

b. Turn-on/off the power supply.