CRD4525-Q1 Cirrus Logic Inc, CRD4525-Q1 Datasheet - Page 60

• Manufacturer Part Number: CRD4525-Q1
• Description: REFERENCE BOARD FOR CS4525 PWM
• Manufacturer: Cirrus Logic Inc
• Series: Popguard®r

Specifications of CRD4525-Q1

• Amplifier Type: Class D
• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 15W x 2 @ 8 Ohm
• Voltage - Supply: 12 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Board Type: Fully Populated
• Utilized Ic / Part: CS4525
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 598-1586

60
6.4.2
Full-Bridge Output Filter (Stereo or Parallel)
Figure 27
sient voltage suppression circuits are implemented as a RC snubber networks comprised of resistors R
(5.6 Ω, 1/8 W) and capacitors C
sponding output pin. These circuits decrease the slew rate of the output signal and reduce high frequency
ringing which can lead to increased EMI. The Schottky diodes protect the body diodes of the output de-
vices by conducting load current during switching transitions; these diodes must be present to ensure
proper device operation.
The inductors L1 and L2 along with capacitor C1 form the low-pass filter. These values combine with the
nominal load impedance of the speaker to set the cut-off frequency of the filter.
ponent values based on nominal speaker impedance for a corner frequency of approximately 35 kHz
(-3 dB).
shows the output filter for stereo full-bridge and parallel full-bridge output configurations. Tran-
CS4525
OUT+
OUT-
Table 20. Low-Pass Filter Components - Full-Bridge
680 pF
680 pF
Load
4 Ω
6 Ω
8 Ω
5.6 Ω
5.6 Ω
C
C
R
R
Figure 27. Output Filter - Full-Bridge
s
s
s
s
s
(680 pF). These should be placed as close as possible to the corre-
VP
VP
D1*
D2*
D3*
D4*
* ROHM RB160 M-30
L1, L2
10 µH
15 µH
22 µH
or equivalent
L1
L2
C1
0.47 µF
0.47 µF
1.0 µF
C1
Table 20
shows the com-
CS4525
DS726PP3
s