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| 型号： | S-8520A31MC-AVQT2G |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 207 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | LEAD FREE, SOT-23, 5 PIN |
| 文件页数： | 13/44页 |
| 文件大小： | 511K |
| 代理商： | S-8520A31MC-AVQT2G |
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STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series
Rev.9.0_00
Seiko Instruments Inc.
20
5. 2
Bipolar PNP type
Figure 11 shows the sample of circuit diagram using Toshiba Corporation 2SA1213 as the bipolar transistor
(PNP). The hFE value and the Rb value of that bipolar transistor determine the driving capacity, which is used for
increasing the output current.
VIN
EXT
VIN
Rb
Cb
Toshiba Corporation
2SA1213
Figure 11
The Rb value is given by the following equation:
Rb =
VIN 0.7
Ib
0.4
IEXTL
Calculate the necessary base current (Ib) using the (hFE) value of bipolar transistor by the equation, Ib =
IPK
hFE
,
and select a smaller Rb value.
A small Rb value increases the output current, but it also decreases efficiency. Determine the optimum value
through experiment, since the base current may flow on the pulse, or voltage may drop due to wiring resistance.
In addition, if speed-up capacitor Cb is connected in parallel with resistor Rb, as shown in Figure 11, the loss in
switching will be reduced, leading to higher efficiency.
Determine the Cb value using the following equation:
Cb ≤
1
2
× π × R
b × fosc × 0.7
Select the Cb value after performing sufficient evaluation since the optimum Cb value differs depending upon the
characteristics of the bipolar transistor.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8520A32MC-ARR-T2 | 制造商:SII 制造商全称:Seiko Instruments Inc 功能描述:PWM CONTROL & PWM/PFM CONTROL STEP-DOWN SWITCHING REGULATOR-CONTROLLERS |
| S-8520A32MC-AVR-T2 | 功能描述:DC/DC 开关控制器 3.2V 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-8520A32MC-AVRT2G | 功能描述:DC/DC 开关控制器 3.2V 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-8520A32MC-AVRT2U | 功能描述:IC REG CTRLR BUCK SOT23-5 制造商:ablic u.s.a. inc. 系列:- 包装:剪切带（CT） 零件状态:在售 输出类型:晶体管驱动器 功能:降压 输出配置:正 拓扑:降压 输出数:1 输出阶段:1 电压 - 电源（Vcc/Vdd）:2.5 V ~ 10 V 频率 - 开关:180kHz 占空比（最大）:1 同步整流器:无 时钟同步:无 串行接口:- 控制特性:使能 工作温度:-40°C ~ 85°C（TA） 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装:1 |
| S-8520A33MC-ARS-T2 | 制造商:SII 制造商全称:Seiko Instruments Inc 功能描述:PWM CONTROL & PWM/PFM CONTROL STEP-DOWN SWITCHING REGULATOR-CONTROLLERS |
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