- 您现在的位置：买卖IC网 > PDF目录297336 > S-8520D27MC-BVM-T2 0.05 A SWITCHING CONTROLLER, 75 kHz SWITCHING FREQ-MAX, PDSO5 PDF资料下载
参数资料
| 型号： | S-8520D27MC-BVM-T2 |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 75 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 11/43页 |
| 文件大小： | 488K |
| 代理商： | S-8520D27MC-BVM-T2 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页当前第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLOR
Rev.7.5_00
S-8520 / 8521 Series
Seiko Instruments Inc.
19
5. 2 Bipolar PNP type
Figure 11
shows a sample circuit diagram using Toshiba Corporation 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 hFE value and the Rb value of that bipolar transistor.
VIN
EXT
VIN
Rb
Cb
Toshiba Corporation
2SA1213-Y
Figure 11
The Rb-value is given by the following equation:
EXTL
b
IN
b
I
4
.
0
I
7
.
0
V
R
=
Find the necessary base current (Ib) using the (hFE) value of bipolar transistor by the equation,
FE
PK
b
h
I
=
, 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 11,
the switching loss will be reduced, leading to a higher efficiency.
Select a Cb value by using the following equation as a guide:
7
.
0
f
R
2
1
C
osc
b
×
π
≤
Select a Cb value after performing sufficient evaluation since the optimum Cb value differs depending
upon the characteristics of the bipolar transistor.
相关PDF资料 |
PDF描述 |
|---|---|
| S-88502F-T1 | 5 V FIXED POSITIVE REGULATOR, PDSO8 |
| S-88502F-T2 | 5 V FIXED POSITIVE REGULATOR, PDSO8 |
| S-93C66AFJ-TBP | 256 X 16 MICROWIRE BUS SERIAL EEPROM, PDSO8 |
| S-AV10L | 135 MHz - 155 MHz RF/MICROWAVE NARROW BAND HIGH POWER AMPLIFIER |
| S-AV16H | 150 MHz - 160 MHz RF/MICROWAVE NARROW BAND HIGH POWER AMPLIFIER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8520D27MC-BVMT2G | 功能描述:DC/DC 开关控制器 2.7V Step-Down PWM RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8520D28MC-BVN-T2 | 功能描述:DC/DC 开关控制器 2.8V Step-Down PWM RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8520D28MC-BVNT2G | 功能描述:DC/DC 开关控制器 2.8V Step-Down PWM RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8520D29MC-BVO-T2 | 功能描述:DC/DC 开关控制器 2.9V Step-Down PWM RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8520D29MC-BVOT2G | 功能描述:DC/DC 开关控制器 2.9V Step-Down PWM RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
发布紧急采购，3分钟左右您将得到回复。