TDA8927 Philips Semiconductors, TDA8927 Datasheet - Page 17

• Manufacturer Part Number: TDA8927
• Description: Power stage 2 x 80 W class-D audio amplifier
• Manufacturer: Philips Semiconductors

Philips Semiconductors
15.1
When using the system in a mono BTL application (for more output power), the inputs of both channels of the PWM
modulator must be connected in parallel; the phase of one of the inputs must be inverted. In principle the loudspeaker
can be connected between the outputs of the two single-ended demodulation filters.
15.2
The case of the package of the TDA8927J/ST and the heatsink of the TDA8927TH are internally connected to V
15.3
The output power in single-ended applications can be estimated using the formulae:
The maximum current
The output power in BTL applications can be estimated using the formulae:
The maximum current
Where:
The output power at THD = 10%: P
15.4
The reference design for a two-chip class-D audio amplifier for TDA8926J or TDA8927J and TDA8929T is shown in
Fig.9. The Printed-Circuit Board (PCB) layout is shown in Fig.10. The bill of materials is given in Table 1.
The reference design for a two-chip class-D audio amplifier for TDA8926TH or TDA8927TH and TDA8929T is shown in
Fig.11. The PCB layout is shown in Fig.12.
2001 Dec 11
P
P
o(1%)
o(1%)
R
R
P
Power stage 2
audio amplifier
o(1%)
L
s
= series resistance of filter coil
= load impedance
BTL application
Remarks
Output power
Reference designs
=
=
= output power just at clipping
--------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------------- -
------------------------------------------------
--------------------------------------------------------- -
R
R
L
L
+
+
2
R
ds(on)
R
L
R
R
L
ds(on)
I
I
O(max)
O(max)
+
R
80 W class-D
s
+
R
2 R
=
=
s
V
2 R
--------------------------------------------------------------- -
-------------------------------------------------------------------- -
P
V
2V
R
o(10%)
L
P
2V
L
R
P
1 t
L
+
L
P
–
1 t
+
2
1 t
= 1.25
–
R
W(min)
1 t
–
ds(on)
W(min)
R
–
W(min)
ds(on)
W(min)
+
f
P
osc
R
+
o(1%)
f
s
osc
f
R
osc
f
s
2
osc
.
17
should not exceed 7.5 A.
should not exceed 7.5 A.
2
Objective specification
TDA8927
SS
.