- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385170 > BL8501 (上海貝嶺股份有限公司) Step down DC/DC controller PDF資料下載
參數(shù)資料
| 型號： | BL8501 |
| 廠商： | 上海貝嶺股份有限公司 |
| 英文描述： | Step down DC/DC controller |
| 中文描述： | 降壓DC / DC控制器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 421K |
| 代理商： | BL8501 |
http://www.belling.com.cn
- 6-
8/8/2006
Total
10
Pages
BL8501
Thus, with changing the value of R2 and R4, output voltage can be set in the specified range.
In the DC-DC converter, with the load current and external components such as L and C, phase
might be behind 180 degree. In this case, the phase margin of the system will be less and stability
will be worse. To prevent this, phase margin should be secured with proceeding the phase. A pole
is formed with external components L and C3.
pole
F
~ 1/2
3
C
L
A zero (signal back to zero) is formed with R4 and C4.
)
4
2
/(
1
~
C
R
F
zero
For example, if L=27
To make the cut off frequency of the pole as much as 4.5kHz, set R4=33
k
H, C3=47
F, the cut off frequency of the pole is approximately 4.5kHz.
and C4=1000pF. If
OUT
V
is set at 5.5V, R2=7.3
k
is appropriate.
R3 prevents feedback of the noise to
FB
V
pin, about 2.7
k
is appropriate value.
External Components
1. Inductor
Select an inductor that peak current does not exceed
max
IL
. If larger current than allowable
current flows, magnetic saturation occurs and makes transform efficiency worse.
When the load current is definite, the smaller value of L, the larger the ripple current.
Provided that the allowable current is large in that case and DC current is small, therefore,
for large output current, efficiency is better than using an inductor with a large value of L and
vice versa.
2. Diode
Use a diode with low
F
V
(Schottky type is recommended.) and high switching speed.
Reverse voltage rating should be more than
IN
V
and current rating should be equal or more
than
max
IL
.
3. Capacitors
As for
IN
C
, use a capacitor with low ESR (Equivalent Series Resistance) and a capacity of at
least 10
F for stable operation.
OUT
C
can reduce ripple of Output Voltage, therefore 47
F or more value of tantalum type
capacitor is recommended.
4. Lx Transistor
Pch Power MOSFET is required for this IC.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| BL8503-35C1T | 250mA CMOS Low Dropout Voltage Low consumption Regulator |
| BL8503 | 250mA CMOS Low Dropout Voltage Low consumption Regulator |
| BL8503-12C1AB | 250mA CMOS Low Dropout Voltage Low consumption Regulator |
| BL8503-12C1RM | 250mA CMOS Low Dropout Voltage Low consumption Regulator |
| BL8503-12C1SA | 250mA CMOS Low Dropout Voltage Low consumption Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BL8503 | 制造商:BELLING 制造商全稱:SHANGHAI BELLING CO., LTD. 功能描述:250mA CMOS Low Dropout Voltage Low consumption Regulator |
| BL8503-12C1AB | 制造商:BELLING 制造商全稱:SHANGHAI BELLING CO., LTD. 功能描述:250mA CMOS Low Dropout Voltage Low consumption Regulator |
| BL8503-12C1RM | 制造商:BELLING 制造商全稱:SHANGHAI BELLING CO., LTD. 功能描述:250mA CMOS Low Dropout Voltage Low consumption Regulator |
| BL8503-12C1SA | 制造商:BELLING 制造商全稱:SHANGHAI BELLING CO., LTD. 功能描述:250mA CMOS Low Dropout Voltage Low consumption Regulator |
| BL8503-12C1SM | 制造商:BELLING 制造商全稱:SHANGHAI BELLING CO., LTD. 功能描述:250mA CMOS Low Dropout Voltage Low consumption Regulator |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。