TDA8932B NXP Semiconductors, TDA8932B Datasheet - Page 7

• Manufacturer Part Number: TDA8932B
• Description: The TDA8932B is a high efficiency class-D amplifier with low power dissipation
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8932B_4
Product data sheet
Fig 4.
Start-up sequence
OUT1, OUT2
HVP1, HVP2
POWERUP
ENGAGE
HVPREF
OSCIO
DREF
8.3 Pulse width modulation frequency
audio
PWM
DIAG
V
P
2.0 V (typical)
1.2 V (typical)
The output 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 V
be set between 300 kHz and 500 kHz. Using an external resistor of 39 k , the carrier
frequency is set to an optimized value of 320 kHz (see
If two or more TDA8932B devices are used in the same audio application, it is
recommended to synchronize the switching frequency of all devices. This can be realized
by connecting all OSCIO pins together and configure one of the TDA8932B in the
application as clock master, while the other TDA8932B devices are configured in slave
mode.
Pin OSCIO is a 3-state input or output buffer. Pin OSCIO is configured in master mode as
an oscillator output and in slave mode as an oscillator input. Master mode is enabled by
applying a resistor while slave mode is entered by connecting pin OSCREF directly to pin
V
The value of the resistor also sets the frequency of the carrier which can be estimated by
the following formula:
SSD(HW)
(without any resistor).
operating
AUDIO
Rev. 04 — 18 December 2008
PWM
mute
operating
AUDIO
fault
SSD(HW)
Figure
operating
AUDIO
PWM
. The carrier frequency can
5).
Class-D audio amplifier
TDA8932B
0.8 V
© NXP B.V. 2008. All rights reserved.
001aaf885
sleep
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