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TDA8953 Fiches technique(PDF) 8 Page - NXP Semiconductors |
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TDA8953 Fiches technique(HTML) 8 Page - NXP Semiconductors |
8 / 46 page 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 |
Numéro de pièce similaire - TDA8953_15 |
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Description similaire - TDA8953_15 |
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