CS4525 datasheet(55/91 Pages) CIRRUS

Part #	CS4525

Description	30 W Digital TV Amplifier with Integrated ADC

PDF	91 Pages

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Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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55 / 91 page

DS726A1

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

Ω

10 µH

1.0 µF

Ω

15 µH

0.47 µF

Ω

22 µH

0.47 µF

Table 17. Low-Pass Filter Components - Full-Bridge

OUT1

330 pF

Ω

OUT2

Figure 26. Output Filter - Full-Bridge

CS4525 Datasheet(PDF) 55 Page - Cirrus Logic