Akai LCT32AD Service Manual page 68

Digital Power Amplifier
Consideration about the PCB design
The Power dispassion at 10Wx2ch(SE) or 20Wx1ch(BTL) is estimated
almost 2W. It has enough margin, designing the PCB at θja=30℃/W.
(1)PCB basic design (copper plane)
<the best design : 4 layer PCB>
PCB
<PCB size estimation >
<the economy design : 2 layer PCB>
PCB
The GND&Power line total area size is also equal to the above GND&Power
line total area size of the 4layer PCB.
<PCB size estimation >
(2)PCB Thermal Pad
The exposed die pad is directly soldered with the printed-circuit board pattern .
Thermal Pad
R2S15102NP
thermal via
10Wx2ch: 75mm x 75mm
Thermal Via
10Wx2ch: (75+α)mm x (75+α) mm
66／129
GND plane
Power plane
Rich GND&Power line Area
Additional
Thermal Via
PCB
Thermal Via