TDA8950 datasheet(11/39 Pages) NXP

11 / 39 page

TDA8950_1

Preliminary data sheet

Rev. 01 — 9 September 2008

11 of 39

NXP Semiconductors

TDA8950

× 150 W class-D power ampliﬁer

[1]

Ampliﬁer gain will depend on junction temperature and heatsink size.

[2]

Only complete shutdown of ampliﬁer if short-circuit impedance is below threshold of 1

Ω. In all other cases

current limiting results in clipping of the output signal.

[3]

Fault condition detected during (every) transition between standby-to-mute and during restart after

activation of OCP (short-circuit to one of the supply lines).

8.4 Differential audio inputs

For a high common mode rejection ratio and a maximum of ﬂexibility in the application, the

audio inputs are fully differential.

There are two possibilities:

• For stereo operation it is advised to use the inputs in anti phase and also to connect

the speakers in anti phase (to avoid acoustical phase differences). This construction

has several advantages:

– The peak current in the power supply is minimized

– The supply pumping effect is minimized, especially at low audio frequencies

• For mono BTL operation it is required that the inputs are connected in anti parallel.

The output of one of the channels is inverted and the speaker load is now connected

between the two outputs of the TDA8950. In principle the output power to the speaker

can be signiﬁcantly boosted to two times the output power in single ended stereo.

The input conﬁguration for a mono BTL application is illustrated in Figure 7.

Table 4.

Overview of TDA8950 protections

Protection name

Complete

shutdown

Restart directly

Restart after

100 ms

Pin PROT

detection

TFB[1]

NNNN

OTP

OCP

Y[2]

N[2]

Y[2]

N[3]

UVP

OVP

UBP

Fig 7.

Input conﬁguration for mono BTL application

Vin

IN1P

OUT1

power stage

mbl466

OUT2

SGND

IN1M

IN2P

IN2M

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