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參數(shù)資料
| 型號： | LA4445 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 5.5W 2-Channel AF Power Amplifier |
| 中文描述： | 5.5W雙通道自動對焦功率放大器 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 211K |
| 代理商： | LA4445 |
LA4445
No.1277–4/7
Description of External Parts
C1 (C2) :
Feedback capacitor
Low cutoff frequency f
L
depends on this feedback capacitor. Increasing the capacitor value makes the
starting time later
C3 (C4) :
Bootstrap capacitor
If the capacitor value is decreased, the output at low frequencies goes lower.
(Recommended value : 47
μ
F min.)
C5 (C6) :
Oscillation blocking capacitor
Polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is
recommended. The capacitor value can be reduced to 0.047
μ
F depending on the stability of the board.
C7 (C8) :
Output capacitor
The low cutoff frequency depends on this output capacitor. In bridge connection applications the output
capacitor must be normally connected.
C9 :
Decoupling capacitor
Used for the ripple filter. Since the rejection effect is saturated at a certain capacitor value, it is mean-
ingless to increase the capacitor value more than needed. This capacitor, being also used for the time
constant of the pop noise preventer, affects the starting time. Too small a capacitor value makes the pop
noise level higher.
C10 :
Power source capacitor.
R1 (R2) :
Oscillation blocking filter resistor.
IC Application
1. V.G. can be reduced by connecting R
NF
’ to the N.F. pin (pins 1, 6)
V.G. is calculated by the following formula.
VG=20log R
f
/ (R
NF
+R
NF
’)
where R
f
=20k
, R
NF
=50
The usable lower limit of VG is 36dB or thereabouts. When setting VG, oscillation and high cutoff frequency f
H
must be considered.
2. External audio muting method
Proper Cares in Using IC
· If the IC is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum
rating to be exceeded, thereby leading to breakdown. Allow an ample margin of variation for supply voltage, etc. and
use the IC in the range where the maximum ratings is not exceeded.
· Printed circuit board
When making the board, refer to the sample printed circuit pattern. No feedback loop must be formed between input and
output. Both Pins GND and Power GND must be shorted at the root of IC pin so that the common impedance can be
reduced.
· Others
The radiator fin on the package must be normally connected to GND.
Some plug jacks to be used for connecting to the external speaker are such that both poles are shorted once when
connecting. In this case, the load is shorted, which may break down the IC.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA4446 | 5.5W 2-Channel AF Power Amp |
| LA4450 | Two Channel Power IC for Bus or Track Use in TV and Home Audio Applications |
| LA4460 | 12W AF Power Amplifier For Car Radio or Car Stereo |
| LA4465 | BTL-OCL 12W AF Power Amp For Car Stereo Use |
| LA4470 | BTL-OCL 20W Power Amp For Car Stereo Use |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4445-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA4446 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:5.5W 2-Channel AF Power Amp |
| LA4450 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Two Channel Power IC for Bus or Track Use in TV and Home Audio Applications |
| LA4450_10 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Bus and Track in Car Stereo 2-Channel Power Amplifier |
| LA4450-E | 功能描述:音頻放大器 2-CH POWER AMPLIFIER RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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