TDA8932T View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

TDA8932T

Class-D audio amplifier

NXP Semiconductors. 

NXP Semiconductors

TDA8932

Class-D audio amplifier

If the transition between Mute mode and Operating mode is controlled via a time constant,

the start-up will be pop free since the DC output offset voltage is applied gradually to the

output between Mute mode and Operating mode. The bias current setting of the

VI-converters is related to the voltage on pin ENGAGE:

• Mute mode: the bias current setting of the VI-converters is zero (VI-converters

disabled)

• Operating mode: the bias current is at maximum

The time constant required to apply the DC output offset voltage gradually between Mute

mode and Operating mode can be generated by applying a decoupling capacitor on pin

ENGAGE. The value of the capacitor on pin ENGAGE should be 470 nF.

VP

POWERUP

DREF

HVPREF

HVP1, HVP2

0.43VENGAGE

ENGAGE 0.3VENGAGE

audio

OUT1, OUT2

PWM

AUDIO

PWM

AUDIO

AUDIO

PWM

0.17VENGAGE

DIAG

OSCIO

Fig 3. Start-up sequence

operating

mute

operating fault

operating

sleep

001aae788

8.3 Pulse width modulation frequency

The output signal of the amplifier is a PWM signal with a carrier frequency of

approximately 320 kHz. Using a 2nd-order low-pass filter in the application results in an

analog audio signal across the loudspeaker. The PWM switching frequency can be set by

an external resistor Rosc connected between pins OSCREF and VSSD(HW). The carrier

frequency can be set between 300 kHz and 500 kHz. Using an external resistor of 39 kΩ,

the carrier frequency is set to an optimized value of 320 kHz (see Figure 4).

TDA8932_2

Preliminary data sheet

Rev. 02 — 12 December 2006

© NXP B.V. 2006. All rights reserved.

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