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TDA8953 Fiches technique(PDF) 8 Page - NXP Semiconductors

No de pièce TDA8953
Description  2 횞 210 W class-D power amplifier
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8953 Fiches technique(HTML) 8 Page - NXP Semiconductors

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TDA8953_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 24 December 2009
8 of 46
NXP Semiconductors
TDA8953
2
× 210 W class-D power amplifier
8.2 Pulse-width modulation frequency
The amplifier output signal is a PWM signal with a typical carrier frequency of between
250 kHz and 450 kHz. A second-order LC demodulation filter on the output converts the
PWM signal into an analog audio signal. The carrier frequency, fOSC, is determined by an
external resistor, ROSC, connected between pins OSC and OSCREF. The optimal carrier
frequency setting is between 250 kHz and 450 kHz.
The carrier frequency is set to 335 kHz by connecting an external 30 k
Ω resistor between
pins OSC and OSCREF (see Figure 6).
If two or more Class D amplifiers are used in the same audio application, an external clock
circuit must be used to synchronize all amplifiers (see Section 14.4). This will ensure that
they operate at the same switching frequency, thus avoiding beat tones (if the switching
frequencies are different, audible interference known as ‘beat tones’ can be generated).
8.3 Protection
The following protection circuits are incorporated into the TDA8953:
Thermal protection:
– Thermal FoldBack (TFB)
– OverTemperature Protection (OTP)
OverCurrent Protection (OCP)
Window Protection (WP)
Supply voltage protection:
– UnderVoltage Protection (UVP)
– OverVoltage Protection (OVP)
– UnBalance Protection (UBP)
Clock Protection (CP)
Fig 6.
Carrier frequency as a function of ROSC
ROSC (kΩ)
20
45
40
30
35
25
010aaa596
300
400
500
fOSC
(kHz)
200


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