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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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WM8281ECS/R Datenblatt(PDF) 378 Page - Cirrus Logic |
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WM8281ECS/R Datenblatt(HTML) 378 Page - Cirrus Logic |
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378 / 392 page  WM8281 378 Rev 4.0 Fc = R 2 p L WM8281 R L SPKOUTxP SPKOUTxN Fc = low pass 3dB cut-off frequency Figure 91 Speaker Equivalent Circuit for Filterless Operation For filterless Class D operation, it is important to ensure that a speaker with suitable inductance is chosen. For example, if we know the speaker impedance is 8 Ω and the desired cut-off frequency is 20kHz, then the optimum speaker inductance may be calculated as: L = = = 64 H R 2 p Fc 8 2 p * 20kHz 8 loudspeakers typically have an inductance in the range 20H to 100H, however, it should be noted that a loudspeaker inductance will not be constant across the relevant frequencies for Class D operation (up to and beyond the Class D switching frequency). Care should be taken to ensure that the cut- off frequency of the loudspeaker’s filtering is low enough to suppress the high frequency energy of the Class D switching and, in so doing, to prevent speaker damage. The Class D outputs of the WM8281 operate at much higher frequencies than is recommended for most speakers and it must be ensured that the cut-off frequency is low enough to protect the speaker. |
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