TDA8920CJ datasheet(11/40 Pages) NXP

Il numero della parte	TDA8920CJ

Spiegazioni elettronici	2 X110 W class-D power amplifier

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TDA8920C_1

Preliminary data sheet

Rev. 01 — 29 September 2008

11 of 40

NXP Semiconductors

TDA8920C

2

× 110 W class-D power ampliﬁer

[1]

Ampliﬁer gain depends on the junction temperature and heatsink size.

[2]

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

Ω. In all other

cases current limiting results in a clipped output signal.

[3]

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

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

8.4 Differential audio inputs

The audio inputs are fully differential ensuring a high common mode rejection ratio and

maximum ﬂexibility in the application.

• Stereo operation: it is advised to use the inputs in anti-phase and connect the

speakers in anti-phase, to avoid acoustical phase differences. The construction

advantages are:

– minimized power supply peak current

– minimized supply pumping effect, especially at low audio frequencies

• Mono BTL operation: it is required that the inputs are connected in anti-parallel. The

output of one channel is inverted and the speaker load is connected between the two

outputs of the TDA8920C. In principle, the output power to the speaker can be

boosted to twice the output power of single-ended stereo.

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

Table 4.

Overview of TDA8920C protection strategies

Protection name

Complete

shutdown

Restart directly

Restart after

100 ms

Pin PROT

detection

TFB[1]

NNNN

OTP

Y

N

Y

N

OCP

Y[2]

N[2]

Y[2]

Y

WP

N[3]

YN

N

UVP

YN

OVP

Y

N

Y

N

UBP

YN

Fig 7.

Input conﬁguration for mono BTL application

Vin

IN1P

OUT1

power stage

mbl466

OUT2

SGND

IN1M

IN2P

IN2M

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