MS6890 datasheet(6/10 Pages) MOSA

6 / 10 page

MOSA

MS6890

Mono 1.1W Power Amplifier with Shutdown

REV 4

6/10

www.mosanalog.com

APPLICATION INFORMATION

Basic application example

-IN

GND

Vo1

+IN

Bias

control

Vo2

0.39uF

20k

1uF

SHDN

MCU

1uF

20k

8Ω

Fig.1

A audio amplifier application circuit.

External gain-setting

As shown in Fig.1, The amplifier A1 is independent amplifiers with an externally configured gain of AV = - RF/RI. The

amplifier A2 is a closed-loop gain of AV = -1 fixed by two internal resistors. The outputs of A1 and A2 are used to drive

the mono bridged-tied load (BTL).

High Pass Filter

The input capacitor CIN and resister RIN are decided the cut-off frequency of the HPF. The equation is as follows:

fcut-off = 1 / (2π*RIN *CIN)

Thermal pad considerations

The thermal pad must be connected to ground. The package with thermal pad of the MS6890 requires special attention

on thermal design. The thermal pad on the bottom of the MS6890 should be soldered down to a copper pad on the

circuit board. Heat can be conducted away from the thermal pad through the copper plane to ambient. If the copper

plane is not on the top surface of the circuit board, 9 vias of 13 mil or smaller in diameter should be used to thermally

couple the thermal pad to the bottom plane. For good thermal conduction, the vias must be plated through and solder

filled.

MS6890 Datasheet(PDF) 6 Page - MOSA ELECTRONICS