- 您现在的位置：买卖IC网 > PDF目录297336 > S-8521C31MC-BTQ-T2 0.05 A SWITCHING CONTROLLER, 75 kHz SWITCHING FREQ-MAX, PDSO5 PDF资料下载
参数资料
| 型号： | S-8521C31MC-BTQ-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： | 4/43页 |
| 文件大小： | 488K |
| 代理商： | S-8521C31MC-BTQ-T2 |
第1页第2页第3页当前第4页第5页第6页第7页第8页第9页第10页第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
S-8520 / 8521 Series
Rev.7.5_00
12
Seiko Instruments Inc.
Operation
1. Switching control method
1. 1 PWM control (S-8520 Series)
The S-8520 Series consists of DC-DC converters that employ a pulse-width modulation (PWM)
system. This series is characterized by its low current consumption. In conventional PFM system
DC-DC converters, pulses are skipped when they are operated with a low output load current, causing
variations in the ripple frequency of the output voltage and an increase in the ripple voltage. Both of
these effects constitute inherent drawbacks to those converters.
In the S-8520 series the pulse width varies in the range from 0 to 100% according to the load current,
yet ripple voltage produced by the switching can easily be removed by a filter since the switching
frequency is always constant. These converters thus provide a low-ripple voltage over wide range of
input voltage and load current. And it will be skippped to be low current consumption when the pulse
width is 0% or it is no load, input current voltage is high.
1. 2 PWM / PFM switching control (S-8521 Series)
The S-8521 series is a DC-DC converter that automatically switches between a pulse width
modulation method (PWM) and a pulse frequency modulation method (PFM), depending on the load
current, and features low current consumption.
The S-8521 series operates under PWM control with the pulse width duty changing from 25 to 100%
when the output load current is high. On the other hand, when the output current is low, the S-8541
series operates under PFM control with the pulse width duty fixed at 25%, and pulses are skipped
according to the load current. The oscillator thus oscillates intermittently so that the resultant lower
current consumption prevents a reduction in the efficiency when the load current is low.
The
switching point from PWM control to PFM control depends on the external devices (coil, diode, etc.),
input voltage, and output voltage. This series is an especially efficient DC-DC converter at an output
current of around 100
A.
相关PDF资料 |
PDF描述 |
|---|---|
| S-8520B31MC-ARQ-T2 | 0.05 A SWITCHING CONTROLLER, 216 kHz SWITCHING FREQ-MAX, PDSO5 |
| S-8520A28MC-AVN-T2 | 0.05 A SWITCHING CONTROLLER, 216 kHz SWITCHING FREQ-MAX, PDSO5 |
| S-8520D27MC-BVM-T2 | 0.05 A SWITCHING CONTROLLER, 75 kHz SWITCHING FREQ-MAX, PDSO5 |
| S-88502F-T1 | 5 V FIXED POSITIVE REGULATOR, PDSO8 |
| S-88502F-T2 | 5 V FIXED POSITIVE REGULATOR, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8521C31MC-BTQT2G | 功能描述:DC/DC 开关控制器 3.1V Step-Dn PWM/PFM 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-8521C31MC-BXQ-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-8521C32MC-BTR-T2 | 功能描述:DC/DC 开关控制器 3.2V Step-Dn PWM/PFM 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-8521C32MC-BTRT2G | 功能描述:DC/DC 开关控制器 3.2V Step-Dn PWM/PFM 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-8521C32MC-BXR-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 |
发布紧急采购，3分钟左右您将得到回复。