CS4525 데이터 시트보기 (PDF) - Cirrus Logic

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CS4525

30 W Digital Audio Amplifier with Integrated ADC

Cirrus Logic 

6.4.2

CS4525

Full-Bridge Output Filter (Stereo or Parallel)

Figure 27 shows the output filter for a full-bridge configuration. The transient-voltage suppression circuit

(snubber circuit) is comprised of a capacitor (680 pF) and a resistor (5.6 Ω, 1/8 W) on each output pin 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 im-

pedance of the speaker, these values set the cutoff frequency of the filter. Table 20 shows the component

values based on nominal speaker (load) impedance for a corner frequency (-3 dB point) of approximately

35 kHz.

VP

OUTX+

680 pF

5.6 Ω

L1

*Diode is Rohm

RB160M-30 or

equivalent

C1

VP

L2

OUTX-

680 pF

5.6 Ω

Figure 27. Output Filter - Full-Bridge

Load

4Ω

6Ω

8Ω

L1, L2

10 µH

15 µH

22 µH

C1

1.0 µF

0.47 µF

0.47 µF

Table 20. Low-Pass Filter Components - Full-Bridge

60

DS726PP1

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