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CS4525 データシート(PDF) 55 Page - Cirrus Logic |
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CS4525 データシート(HTML) 55 Page - Cirrus Logic |
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55 / 91 page  DS726A1 55 CS4525 6.4.2 Full-Bridge Output Filter (Stereo or Parallel) Figure 26 shows the output filter for a full-bridge configuration. The transient-voltage suppression circuit (snubber circuit) is comprised of a resistor (20 Ω) and capacitor (330 pF) and should be placed as close as possible to the corresponding PWM output pins to greatly reduce radiated EMI. The inductors, L1, and capacitor, C1, comprise the low-pass filter. Along with the nominal load impedance of the speaker, these values set the cutoff frequency of the filter. Table 17 shows the component values based on nominal speaker (load) impedance for a corner frequency (-3 dB point) of approximately 35 kHz. Load L1 C1 4 Ω 10 µH 1.0 µF 6 Ω 15 µH 0.47 µF 8 Ω 22 µH 0.47 µF Table 17. Low-Pass Filter Components - Full-Bridge OUT1 330 pF 20 Ω OUT2 C1 L1 L1 Figure 26. Output Filter - Full-Bridge |
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