Block Diagram

2

,

Power Analog Microelectronics Inc

www.poweranalog.com

PAM8902

30-Vpp Mono Class-D Audio Amplifier for Piezo/Ceramic Speakers

+

GM

-

-

PWM

+

SW

PWM Logic

And Driver

+

-

PGND1

1.5MHz

Oscillator

Enable

Σ

Ramp

Generator

ENA

Comp

CS

Vref

VSET

GSET

+

-

PWM

Modulator

Protection Function

PLL

375KHz

Bias and

Vref

OUT+

OUT-

AVDD

VCM/SS

Level

Shift

and

H-Bridge

PVCC

PGND2

Gain

Adjust

INN

INP

AGND

Gain

Vout

Setting

Resistor

Divider

feedback

PVCC

VCM

VOUT

01/2012 Rev1.4