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參數(shù)資料
| 型號： | HA17432VUP |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. |
| 中文描述： | 關(guān)于在諸如日立電器和日立二十，文件提及的瑞薩科技公司名稱變更 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 146K |
| 代理商： | HA17432VUP |
HA17431H Series
Rev.0, Sep. 2001, page 11 of 15
Practical Example
Consider the example of a photocoupler, with an internal light emitting diode V
F
= 1.05 V and I
F
= 2.5 mA,
power supply output voltage V
2
= 5 V, and bias resistance R
2
current of approximately 1/5 I
F
at 0.5 mA. If
the shunt regulator V
K
= 3 V, the following values are found.
R
1
=5V
–
1.05V
–
3V
2.5mA + 0.5mA
R
2
=1.05V
0.5mA
= 316(
) (330
from E24 series)
= 2.1(k
) (2.2k
from E24 series)
Next, assume that R
3
= R
4
= 10 k
. This gives a 5 V output. If R
5
= 3.3 k
and C
1
= 0.022
μ
F, the
following values are found.
G
2
= 3.3 k
/ 10 k
= 0.33 times (–10 dB)
f
1
= 1 / (2
×
π
×
0.022
μ
F
×
316
×
10 k
) = 2.3 (Hz)
f
2
= 1 / (2
×
π
×
0.022
μ
F
×
3.3 k
) = 2.2 (kHz)
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