参数资料
型号: TDA8933BTW/N2,512
厂商: NXP SEMICONDUCTORS
元件分类: 音频/视频放大
英文描述: 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO32
封装: 6.10 MM, 0.65 MM PITCH, PLASTIC, SOT-249-1, HTSSOP-32
文件页数: 40/42页
文件大小: 245K
代理商: TDA8933BTW/N2,512
TDA8933B_1
NXP B.V. 2008. All rights reserved.
Preliminary data sheet
Rev. 01 — 23 October 2008
7 of 42
NXP Semiconductors
TDA8933B
Class D audio amplier
8.3 Pulse Width Modulation (PWM) frequency
The output signal of the amplier is a PWM signal with a carrier frequency of
approximately 320 kHz. Using a 2nd-order low-pass lter 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 pin OSCREF and VSSD(HW). The carrier
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 Figure 4).
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 Section 14.6 for
more information.
The value of the resistor also sets the frequency of the carrier and can be calculated with
(1)
Where:
fosc = oscillator frequency (Hz)
Fig 3.
Start-up sequence
VP
POWERUP
DREF
HVPREF
HVP1, HVP2
ENGAGE
2.0 V (typical)
1.2 V (typical)
PWM
OUT1, OUT2
DIAG
OSCIO
010aaa457
operating
PWM
sleep
mute
operating
fault
AUDIO
≤ 0.8 V
f
osc
12.45x10
9
R
osc
-------------------------
=
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