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參數(shù)資料
| 型號(hào)： | LA4558 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.4 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP12 |
| 封裝： | DIP-12 |
| 文件頁數(shù)： | 3/9頁 |
| 文件大小： | 321K |
| 代理商： | LA4558 |
LA4558
No.2088–3/9
Sample Printed Circuit Pattern (Cu-foiled side)
Description of External Parts
C1 (C2) : Feedback capacitor. The low cutoff frequency is determined by the following formula.
fL : Low cutoff frequency
Rf : Feedback resistance
Since this capacitor as well as decoupling capacitor affects the starting time, the capacitor value must be fixed
with the necessary low frequency band fully considered.
C3 (C4) : Bootstrap capacitor. The output at low frequencies depends on this capacitor. Decreasing the capacitor value
lowers the output at low frequencies. A capacitor value of 47
F or more is required.
C5 (C6) : Oscillation blocking capacitor. Use a polyester film capacitor that is good in high frequency response and
temperature characteristic. The use of an electrolytic capacitor, ceramic capacitor may cause oscillation to
occur at low temperatures.
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 CD1. Used for the ripple filter. Since the rejection effect is saturated at a certain capaci-
tor value, it is meaningless to increase 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.
C11 :
Decoupling capacitor CD2. Used for the ripplie filter. Particularly effective for transient characteristic.
fL=
1
2
πC1Rf
Sample Application Circuit : Bridge Amplifier Use
fL=
1
2
πC7RL
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