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2004 May 05 15
Philips Semiconductors Preliminary specification
Power stage 2 x 10 or 1 x 20 W class-D
audio amplifier
TDA8928J
mgx381
Top silk
TDA8928ST
In1 In2
Con3
C32 C33
L2
L1
L4
L3
C4 C3
DZ1
C14 C15
J3
C6
C7
C27
C5
U1
J2
J1
Con2 Con1
CO2 CO1
S1
DZ2
power_on
GND
Out1 Out2
V
DD
V
SS
state of D art
V
P
typ +/- 12.5 V
2 x 10 W in 8 Ω
single layer
demo PCB v2r4
RL 1 2003
Fig.8 Printed-circuit board (top silk) layout for TDA8928ST.
15.4.2 BILL OF MATERIALS
COMPONENT DESCRIPTION TYPE COMMENTS
U1 TDA8928ST Philips Semiconductors,
SOT577-2
U2 LM393AD National, SO8 alternatives: TI
semiconductors and On
semiconductors
DZ1 36 V Zener diode BZX-79C36V, DO-35 used as jumper
DZ2 3.3 V Zener diode BZX-79C3V3, DO-35 used as jumper, optional
Q1 BC848 transistor NPN, SOT23
Q2 BC856 transistor PNP, SOT23
L1, L2 bead Murata BL01RN1-A62 used as jumper
L3, L4 33 µH coil Toko 11RHBP-330M ws totally shielded
S1 power-on switch PCB switch, SACME
09-03290-01
optional
Con1 V
SS
, GND, V
DD
connector Augat 5KEV-03 optional
Con2, Con3 Out2, Out1 connector Augat 5KEV-02 optional
CO1, CO2 In1, In2 connector Cinch Farnell 152-396 optional
J1, J2, J3 wire Jumpers, D = 0.5 mm
Capacitors
C37 220 pF, 50 V SMD0805
C28, C29, C30,
C31
560 pF, 100 V SMD0805 50 V is OK