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参数资料
| 型号： | LA4550 |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP12 |
| 封装： | DIP-12 |
| 文件页数： | 4/9页 |
| 文件大小： | 331K |
| 代理商： | LA4550 |
LA4550
No.1718–4/9
Continued from preceding page.
C7 (C8) : Output capacitor. The low cutoff frequency is determined by the following formula.
fL : Low cutoff frequency
RL : Load resistance
To make the low frequency response in the bridge amplifier mode identical with that in the stereo mode, the
capacitor value must be doubled.
C9 :
Decoupling capacitor. Used for the ripple filter. Since the rejection effect is saturated the capacitor value more
than needed. This capacitor, being also used for the time constant of the muting circuit, affects the starting
time.
C10 :
Power source capacitor.
Application Circuits
Voltage gain adjust
Stereo mode
The voltage gain is determined by on-chip resistor R1 (R2) and external feedback resistor Rf as follows :
Any voltage gain can be obtained by external
resistor Rf.
[BTL 1]
Bridge amplifier 1 mode
Assuming R2=R4=50
, R1=R3=20k and Rf1=Rf2, the voltage gain is obtained by :
[BTL 2]
Bridge amplifier 2 mode
The CH1 is a noninverting amplifer and the CH2 is an inverting amplifier. The total voltage gain, being apparently
higher than that of the CH1 by 6dB, is approximately calculated by the following formula.
VG=20log R2/R1+6 (dB)
To reduce the voltage gain, Rf is connected and the following formula is used.
VG=20log R2/Rf+R1+6 (dB)
fL=
1
2
πC7RL
VG=20 log
[dB]
R1
Rf1+R2
Vo1
≈
Vi
R1
R2+R4+Rf1+Rf2
Vo2
≈ –
Vi
R3
R2+R4+Rf1+Rf2
Vo = Vo1 – Vo2
=
Vi
R1+R3
R2+R4+Rf1+Rf2
∴VG=20 log
=20log
[dB]
Vo
Vi
R1+R3
R2+R4+Rf1+Rf2
VG=20 log
[dB]
R1
Rf1+R2
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相关代理商/技术参数 |
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| LA4555 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:2-Channel AF Power Amplifier for Radio, Tape Recorder Use |
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