參數(shù)資料
型號(hào)： S-8520B50MC-ASJ-T2
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 13/37頁(yè)
文件大?。?/td> 599K
代理商： S-8520B50MC-ASJ-T2
PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
Rev.7.2
S-8520/8521 Series
Seiko Instruments Inc.
13
For reference purpose, some efficiency data has been included in this document. For applications with
an input voltage range of 10 V or less, data was obtained by using TM6201 of Toyoda Automatic Loom
Works, Ltd. IRF7606, a standard of International Rectifier, was used for applications with an input
voltage range over 10 V. Refer to "Reference Data."
5.2 Bipolar PNP type
Figure 7 shows a sample circuit diagram using Toshiba 2SA1213-Y for the bipolar transistor (PNP).
The driving capacity for increasing the output current by means of a bipolar transistor is determined by
the h
FE
-value and the Rb-value of that bipolar transistor.
VIN
EXT
2SA1213-Y
VIN
Rb
Cb
Figure 7
The Rb-value is given by the following equation:
Ib
|IEXTL|
0.4
VIN-0.7
Rb=
Find the necessary base current Ib using the h
FE
- value of bipolar transistor by the equation, Ib =
Ipk/hFE, and select a smaller Rb-value.
A small Rb-value will certainly contribute to increasing the output current, but it will also adversely
affect the efficiency. Moreover, in practice, a current may flow as the pulses or a voltage drop may take
place due to the wiring resistance or some other reason. Determine an optimum value through
experimentation.
In addition, if speed-up capacitor Cb is inserted in parallel with resistance Rb, as shown in Figure 7, the
switching loss will be reduced, leading to a higher efficiency.
Select a Cb-value by using the following equation as a guide:
2
π
xRb x f
OSC
x 0.7
1
Cb
≤
However, the practically-reasonable Cb value differs depending upon the characteristics of the bipolar
transistor. Optimize the Cb value based on the experiment result.
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S-8520B50MC-ASJT2G 功能描述:DC/DC 開(kāi)關(guān)控制器 5.0V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
S-8520B53MC-ASMT2G 功能描述:DC/DC 開(kāi)關(guān)控制器 Step Down SWR PWM 180kHz 60uA Iq RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
S-8520C25MC-BRK-T2 功能描述:DC/DC 開(kāi)關(guān)控制器 2.5V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
S-8520C25MC-BRKT2G 功能描述:DC/DC 開(kāi)關(guān)控制器 2.5V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
S-8520C25MC-BVK-T2 制造商:SII 制造商全稱(chēng):Seiko Instruments Inc 功能描述:PWM CONTROL & PWM/PFM CONTROL STEP-DOWN SWITCHING REGULATOR-CONTROLLERS
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