CS44130 Cirrus Logic, CS44130 Datasheet - Page 17

Manufacturer Part Number

CS44130

Description

60 W Quad Half-Bridge Digital Amplifier Power Stage

Manufacturer

Cirrus Logic

Datasheet

1.CS44130.pdf (23 pages)

DS690PP1

4.4.2

Full-Bridge Output Filter (Stereo or Parallel)

Figure 6

capacitor (330 pF), as well as the diodes, should be placed as close as possible to the corresponding

PWM output pins. This will greatly reduce radiated EMI. The inductors, L1 and L2, and capacitor, C1, com-

prise the low-pass filter. Along with the nominal load impedance of the speaker, these values set the cutoff

frequency of the filter.

for a corner frequency (-3 dB point) of approximately 35 kHz.

shows the output filter for a full-bridge configuration. The snubber resistor (20 Ω , 1/10 W) and

+ PWM

Output

- PWM

Output

Table 4

Table 4. Low-Pass Filter Components - Full-Bridge

Figure 6. Output Filter - Full-Bridge

shows the component values based on nominal speaker (load) impedance

20 Ω

330 pF

Load

4 Ω

6 Ω

8 Ω

L1 & L2

*Diode is Zetex

10 µH

15 µH

22 µH

ZHCS400 or

equivalent

0.47 µF

1.0 µF

CS44130