EVG_PAM8615_BTL

AE Department

1. Revision Information

Date Revision Description Comment 2011/08 V2.0 Initial release BTL Application2. Key Features

◆32W/ch into 8ohm BTL Load from 24V supply (Thermal limited)

◆16W/ch into 4ohm SE Load from 24V supply (Thermal limited)

◆Operates from 8V to 30V

◆Supports Multiple Output Configurations

◆2-Ch Single-ended (half bridge)(16WX2)

◆1 Ch Bridge tied load (full bridge)(32WX1)

◆High efficiency above 90%

◆ step DC Volume Control from 40Db to 36dB

◆Single Ended Analog Inputs

◆Thermal and Short Circuit Protection

◆Flexible Frequency Adjustable by external

◆Clock Output for Synchronization With Multiple Class D Devices component

4. EV-Board PAM8615 EB104AB Description

EB104AB is designed for evaluated PAM8615. PAM8615 is a 32W.Class-D amplifier

which can be configured to BTL Mode.

PAM8615 built in DC volume control range from -40DB to 36DB. The internal synchronize function makes multiple amplifiers

work at the same oscillate frequency, which decrease the interference between amplifiers.

5. EV Board View and Jack Description

Top Layer

Bottom Layer

6. EV board operational sequence:

a. Connect SD to a high and MUTE to a low for normal operation

b. Connect audio input from audio input jack (differential or single-end signal )

c. Connect the loading(speaker or power resistor) to the output jack

d. Power on:10V to 26V DC power supply7. EV Board BOM List

Item Value Type Rating Description Vender and port C9,C10 1uF X5R/X7R, Ceramic/0603 25V Input coupling CAP TMK107B7105KA-T C19 1uF X5R/X7R, Ceramic/0603 25V AVDD coupling CAP TMK107B7105KA-T C12,C13 1uF X5R/X7R, Ceramic/0603 50V High side driver bootstrap CAP UMK107BJ105KA-T C7,C8 0.1uF X5R/X7R, Ceramic/0603 50V PVCC coupling CAP, UMK212B7104KG-T C4,C5 10uF X5R/X7R, Ceramic/1210 50V PVCC main coupling CAP, UMK325BJ106MM-T C1,C2 470uF Electrolytic 50V Power supply decoupling CAP

C14 1uF X5R/X7R, Ceramic/0603 25V Vclamp coupling CAP TMK107B7105KA-T C11 1uF X5R/X7R, Ceramic/0603 25V Internal VCM decoupling CAP UMK107BJ105KA-T C20 0.1uF X5R/X7R, Ceramic/0603 50v AVCC coupling CAP UMK212B7104KG-T C6 10uF X5R/X7R, Ceramic/1210 50V AVCC main coupling CAP UMK325BJ106MM-T R7 100K 0603 1% OSC external Resistance

R1,R2 20k 0603 1% Input Resistor

C3 470uF Electrolytic 50V Power supply decoupling CAP

R8 10Ω0603 5% Separate AVCC from PVCC

D1,D2 SS14 Protection diodes

VR1 50k 1% Resistor for DC volume control

C22 1uF X5R/X7R, Ceramic/0603 25V AP VDD coupling CAP TMK107B7105KA-T C21 10uF X5R/X7R, Ceramic/0805 10V AP VDD coupling CAP LMK107BBJ106MALT R3 120k 0603 AP input Resistor

R6 120k 0603 AP feedback resistor

R4,R5 3.3Ω0603 Snubber (option)

C17,C18 10nF 0603 50V Snubber (option)

IC1 PAM8615 PAM IC2 PAM6201 PAM

FB1,FB2 600Ω1206

C15,C16 1nF X5R/X7R, Ceramic/0603 50V For EMI eliminate components

form a FB-CAP filter) UMK107SD102KA-T

8. External component selection

Input capacitor (C9, C10)

(1) The capacitor and input resistor implement a high pass filter. The corner frequency was determined as below:

Fc=1/(2×Pi×RC)

(2) The bigger input capacitor, the better low frequency response

Power decoupling capacitor (C4, C5, C6, C7, C8, C20)

(1) C4, C5, C6 should be 10uF/50V X7R or X5R ceramic

(2) C7, C8, C20 0.1uF/35V ceramic capacitor, place close to the IC

EMI Eliminate Filter (FB1, FB2)

(1) High impedance at high frequency and very low impedance at low frequency

(2) The current rating is higher than 4A

9. PCB layout guideline

(1) All decoupling capacitors should be placed very close to the PAM8615.

(2) Please separate AGND and PGND to obtain the best performance.

Keep the trace short between PAM8615 GND pins and decoupling capacitors.

(3) Keep power line short and thick

(4) Audio input trace should avoid routing through noisy area.

10. PCB Layout Example

Top layer

Bottom layer