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參數資料
| 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： | 5/10頁 |
| 文件大小： | 421K |
| 代理商： | BL8501 |
http://www.belling.com.cn
- 5-
8/8/2006
Total
10
Pages
BL8501
frequency characteristics such as tantalum capacitors. We recommend you to use output
capacitors with an allowable voltage at least twice as much as setting output voltage. This is
because there may be a case where a spike –shaped high voltage is generated by an
inductor when an external transistor is on and off.
Choose an inductor that has sufficiently small D.C. resistance and large allowable current
and is hard to reach magnetic saturation. And if the value of inductance of an inductor is
extremely small, the
LX
I
may exceed the absolute maximum rating at the maximum
loading.
Use an inductor with appropriate inductance.
Use a diode of a Schottky type with high switching speed, and also pay attention to its
current capacity.
Do not use this IC under the condition with
IN
V
voltage at equal or less than minimum
operating voltage.
When the threshold level of an external power MOSFET is rather low and the drive-ability of
voltage supplier is small, if the output pin is short circuit, input voltage may be equal or less
than UVLO detector threshold. In this case, the device is reset with UVLO function that is
different from the reset-protection function caused by maximum duty cycle.
With the PWM/VFM alternative circuit, when the on duty cycle of switching is 20% or less,
the IC alters from PWM mode to VFM mode (Pulse skip mode). The purpose of this circuit is
raising the efficiency with a light load by skipping the frequency and suppressing the
consumption current. However, the ratio of output voltage against input voltage is 20% or
less, (ex.
IN
V
>10V and
OUT
V
=2V) even if the large current may be loaded, the IC keeps its
VFM mode. As a result, frequency might be decreased, and oscillation waveform might be
unstable. These phenomena are the typical characteristics of the IC with PWM/VFM
alternative circuit.
The performance of power source circuits using this IC extremely depends upon the
peripheral circuits. Pay attention in the selection of the peripheral circuits. In particular, design
the peripheral circuits in a way that the values such as voltage, current, and power of each
component, PCB patterns and the IC does not exceed their respected rated values.
How to Adjust Output Voltage and about Phase Compensation
As for adjustable Output type, feedback pin (
FB
V
) voltage is controlled to maintain 1.0V.
Output Voltage,
OUT
V
is as following equation:
OUT
V
: (R2+R4)=
FB
V
: R2
OUT
V
=
FB
V
*(R2+R4)/R2
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| 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 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
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