MAX9737 Просмотр технического описания (PDF) - Maxim Integrated

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MAX9737

Mono 7W Class D Amplifier

Maxim Integrated 

Mono 7W Class D Amplifier

8V TO 28V

Typical Application Circuit

REG 12

1μF

CREG

RIN

20kΩ

RFB

20kΩ

PRE 8

IN 7

CCOM

1μF

COM 9

CIN

0.47μF

PC 6

AUDIO

INPUT

SHDN

LOGIC INPUT

1μF

1μF

VS

13, 14

PVDD

1, 17, 18

REGULATOR

1μF

100μF

C1

0.1μF

C1P

C1N

16

15

CHARGE

PUMP

C2

1μF

2 CHOLD

POWER

STAGE

23, 24 OUT+

19, 20 OUT-

BIAS

PRECHARGE

CONTROL

5

SHDN

4

MUTE

VS

MAX9737

3, 10, 11

21, 22

AGND

PGND

Supply Bypassing, Layout, and Grounding

Proper layout and grounding are essential for optimum

performance. Use wide traces for the power-supply

inputs and amplifier outputs to minimize losses due to

parasitic trace resistance. Proper grounding improves

audio performance, minimizes crosstalk between chan-

nels, and prevents switching noise from coupling into

the audio signal. Connect PGND and AGND together at

a single point on the PCB. Route all traces that carry

switching transients away from AGND and the

traces/components in the audio signal path.

Bypass PVDD with two 1µF capacitors to PGND. Place

the bypass capacitors as close as possible to the

MAX9737. Place a 100µF capacitor between PVDD and

PGND. Bypass VS, VCOM, and VREG with a 1µF capacitor

to AGND.

Use wide, low-resistance output traces. Current drawn

from the outputs increases as load impedance

decreases. High-output trace resistance decreases the

power delivered to the load. The MAX9737 TQFN pack-

age features an exposed thermal pad on its underside.

This pad lowers the package’s thermal resistance by

providing a heat conduction path from the die to the

PCB. Connect the exposed thermal pad to PGND by

using a large pad and multiple vias to the PGND plane.

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