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參數(shù)資料
| 型號： | S-8520 |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | PWM Control Step-Down Switching Regulator-Controller(PWM 控制，步降開關穩(wěn)壓器-控制器) |
| 中文描述： | PWM控制降壓型開關穩(wěn)壓控制器（脈寬調(diào)制控制，步降開關穩(wěn)壓器-控制器） |
| 文件頁數(shù)： | 27/30頁 |
| 文件大?。?/td> | 650K |
| 代理商： | S-8520 |
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26
Collection of Product FAQs
Author: Tachibana Midori
Date: 98/11/12 (Thursday) 10:17 (Modified: )
<Information level>
A:
Public (Printing O.K.)
Index:
B: Technical
<Product>
Division name: 01 IC
Category 1:
11 Power Supply
Category 2:
4. Switching Regulators
Cal No.:
S-8520/21
Related documents:
Question:
Why does the efficiency under a low load differ significantly between the 180-KHz type and the 60-KHz
type
Answer:
The efficiency characteristics graph in the reference data (Rev. 6. 1, p. 24) on the data sheet indicates
that there is a difference of a significant % in the efficiency characteristics between the 180-KHz type
(S-8520/1AB) and the 60-KHz type (S-8520/1CD) at a low load (up to 10 mA).
This is due to the fact that the energy obtained from switching in the PFM operation is greater for the
60-KHz type than for the 180-KHz type.
In general, PFM control provides higher efficiency under a low load than does PWM control.
As shown by the Vcont waveforms below for the 60-KHz type and the 180-KHz type, the ton duration is
shorter in the 180-KHz type. Therefore, the energy obtained from switching is smaller and the off time
decreases, as with PWM control, resulting in reduced efficiency under a low load.
However, note that rippling of the output voltage is greater in the 60-KHz type.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| S-8520A20MC-AVFT2G | 功能描述:DC/DC 開關控制器 Step Down SWR PWM 180kHz 60uA Iq RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8520A21MC-AVG-T2 | 功能描述:DC/DC 開關控制器 2.1V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8520A21MC-AVGT2G | 功能描述:DC/DC 開關控制器 2.1V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8520A25MC-ARK-T2 | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:PWM CONTROL & PWM/PFM CONTROL STEP-DOWN SWITCHING REGULATOR-CONTROLLERS |
| S-8520A25MC-AVK-T2 | 功能描述:DC/DC 開關控制器 2.5V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
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