2004 May 05

12

Philips Semiconductors

Preliminary specification

Power stage 2 x 10 or 1 x 20 W class-D

audio amplifier

TDA8928J

15.1

SE application

For a SE application the application diagram as shown in Fig.5 can be used.

15.2

Package ground connection

15.3

Output power

The output power in SE self oscillating class-D applications can be estimated using the formula

The maximum current

should not exceed 2 A.

Where:

15.4

Reference design

The reference design for a self oscillating class-D system for the TDA8928J is shown in Fig.5. The Printed-Circuit Board

(PCB) layout is shown in Figs 6, 7 and 8. The bill of materials is given in Section 15.4.2.

P

o(1%)

R

L

R

L

R

ds(on)

R

s

++

()

------------------------------------------------

V

P

×

2

2R

L

×

----------------------------------------------------------------------

=

I

O(max)

V

P

[]

R

L

R

ds(on)

R

s

++

-------------------------------------------

=