TDA8933B NXP Semiconductors, TDA8933B Datasheet - Page 7

• Manufacturer Part Number: TDA8933B
• Description: The TDA8933B is a high-efficiency class D amplifier with low power dissipation
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8933B_1
Preliminary data sheet
Fig 3.
Start-up sequence
OUT1, OUT2
HVP1, HVP2
POWERUP
ENGAGE
HVPREF
OSCIO
DREF
8.3 Pulse Width Modulation (PWM) frequency
PWM
DIAG
V
P
2.0 V (typical)
1.2 V (typical)
The output signal of the amplifier is a PWM signal with a carrier frequency of
approximately 320 kHz. Using a 2
analog audio signal across the loudspeaker. The PWM switching frequency can be set by
an external resistor R
frequency can be set between 300 kHz and 500 kHz. Using an external resistor of 39 k ,
the carrier frequency is set to a typical value of 320 kHz (see
If two or more TDA8933B devices are used in the same audio application, it is
recommended to synchronize the switching frequency of all devices. See
more information.
The value of the resistor also sets the frequency of the carrier and can be calculated with
Equation
Where:
f
osc
f
osc
=
= oscillator frequency (Hz)
12.45x10
------------------------ -
1:
R
osc
operating
AUDIO
9
osc
Rev. 01 — 23 October 2008
connected between pin OSCREF and V
PWM
mute
nd
operating
AUDIO
-order low-pass filter in the application results in an
fault
operating
AUDIO
PWM
Figure
Class D audio amplifier
SSD(HW)
TDA8933B
4).
0.8 V
© NXP B.V. 2008. All rights reserved.
010aaa457
. The carrier
Section 14.6
sleep
7 of 42
for
(1)