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WM5102 Datasheet(PDF) 319 Page - Wolfson Microelectronics plc |
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WM5102 Datasheet(HTML) 319 Page - Wolfson Microelectronics plc |
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319 / 334 page  Production Data WM5102 w PD, June 2014, Rev 4.2 319 Figure 90 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 8Ω and the desired cut-off frequency is 20kHz, then the optimum speaker inductance may be calculated as: 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 WM5102 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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