RT5508 Datasheet, PDF (20/57 Pages) Richtek Technology Corporation – Speaker Amplifier with Speaker Protection

RT5508
Audio Input
Energy
Filter.
AE
1-AE
Note :Ω = 1-α
Compress
ion Filter
Attack/De
cay Filter
AA
1-AA
AD
1-AD
Alpha Filter Structure
∑
Z^-1
ω
Gain
Audio Output
Figure 15. DRC Structure and Signal Processing Path
Speaker Protection Functions
(from DSP)
data in
Sig=u
stereo gain in
stereo gain out
Data path
Lookahead buffer
Gain Combining
data out
(to clipper)
Pilot
Signal
Excursion
Predict
ALC /Lmt
Gain Gen.
Volume
Gain Gen.
Excursion Response
Control path
DC resistance
Maximum Signal Voltage
Figure 16. Block Diagram of SPK Protection Function
Signal
Detect
Excur.
SI
DCR
Calc.
Clip
Ctrl
i_fb
VBAT
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DS5508-01 March 2017