TDA8927TH datasheet(17/36 Pages) PHILIPS

17 / 36 page

2001 Dec 11

Philips Semiconductors

Objective speciﬁcation

Power stage 2

× 80 W class-D

audio ampliﬁer

TDA8927

15.1

BTL application

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

Remarks

The case of the package of the TDA8927J/ST and the heatsink of the TDA8927TH are internally connected to VSS.

15.3

Output power

The output power in single-ended applications can be estimated using the formulae:

The maximum current

should not exceed 7.5 A.

The output power in BTL applications can be estimated using the formulae:

The maximum current

should not exceed 7.5 A.

Where:

RL = load impedance

Rs = series resistance of filter coil

Po(1%) = output power just at clipping

The output power at THD = 10%: Po(10%) = 1.25 × Po(1%).

15.4

Reference designs

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.

o(1%)

ds(on)

()

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

W(min)

osc

–

()

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

O(max)

W(min)

osc

–

()

[]

ds(on)

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

o(1%)

ds(on)

()

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

W(min)

osc

–

()

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

O(max)

W(min)

osc

–

()

[]

ds(on)

()

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

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