LV49152V 查看數據表（PDF） - ON Semiconductor
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LV49152V Datasheet PDF : 24 Pages
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LV49152V
Cut-off frequency calculation method and the output LC filter setting
OUT+
L
C
C
L
OUT-
CL RL
The cut off frequency fc of the output LC filter is calculated by the following formula.
1
fc = 2π√2LCL
Also, by setting the cut off frequency fc, the value of CL and L is calculated by using the following formula.
1
CL = 2√2 × π RLfc
√2 × RL
L = 4π fc
In general, the value from 20% to 30% of CL is set to C.
In case of fc = 30kHz
RL [Ω]
4
L [μH]
15
6
22
8
33
16
68
CL [μF]
1
0.68
0.47
0.22
C [μF]
0.22
0.15
0.1
0.047
Q
0.650
0.636
0.704
0.739
Above formula is common calculation method and is a measure of constant setting.
In fact, it is necessary to set with each set that considers the speaker characteristics.
In addition, please set the fixed number to become Q ≤ 1 in currents in the fc neighborhood increasing if Q value of the LC
filter is big.
No.A1408-18/24
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