cs4412 Cirrus Logic, Inc., cs4412 Datasheet - Page 16

• Manufacturer Part Number: cs4412
• Description: 30 W Quad Half-bridge Digital Amplifier Power Stage Logic
• Manufacturer: Cirrus Logic, Inc.

16
4.4.2
Full-Bridge Output Filter (Stereo or Parallel)
Figure 6
(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.
er (load) impedance for a corner frequency (-3 dB point) of approximately 35 kHz.
shows the output filter for a full-bridge configuration. The transient-voltage suppression circuit
+ PWM
- PWM
Output
Output
Table 4. DC-Blocking Capacitors Values - Half-Bridge
Table 5. Low-Pass Filter Components - Full-Bridge
Load
Load
4 Ω
6 Ω
8 Ω
4 Ω
6 Ω
8 Ω
20 Ω
330 pF
Figure 6. Output Filter - Full-Bridge
Table 5
Corner Frequency
VP
VP
120 Hz
120 Hz
110 Hz
40 Hz
58 Hz
39 Hz
68 Hz
42 Hz
60 Hz
10 µH
15 µH
22 µH
*Diode is Zetex
shows the component values based on nominal speak-
L1
ZHCS400 or
equivalent
L1
L1
C1
1000 µF
0.47 µF
0.47 µF
680 µF
330 µF
680 µF
390 µF
220 µF
470 µF
330 µF
180 µF
1.0 µF
C2
C1
CS4412
DS749A1