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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(guān)穩(wěn)壓器-控制器) |
| 中文描述： | PWM控制降壓型開關(guān)穩(wěn)壓控制器（脈寬調(diào)制控制，步降開關(guān)穩(wěn)壓器-控制器） |
| 文件頁數(shù)： | 30/30頁 |
| 文件大小： | 650K |
| 代理商： | S-8520 |
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However, the moment the voltage begins to drop, the VREF voltage and VOUT terminal voltage
become 0V, making it impossible to control the output voltage normally. Increases in the output voltage
need to be suppressed until the VREF voltage rises to a certain level. Then, as the VREF reaches
certain voltage level, the output voltage rises instantaneously, causing a rush current.
One countermeasure for this is to add Tr's 2 and 3, R1~4, and C1, as shown in the figure below.
R4
VSS
VOUT
L
SD
CL
ON / OFF
VIN
EXT
S-8520/1
Tr1
OUT
CONT
RL
VIN
2200p
1M
100k
Tr2
2SK1580
Tr3
2SA1362
R2
R3
1M
C1
ON/OFF
OFF/ON
R1
110
47u
47u
The basic concept of this countermeasure is that the same effect as with the soft start-up is obtained by
charging CL from VIN via resistance R4, while ON/OFF keeps Tr1 in the UVLO circuit off coercively by
Lo
→
Hi. Using C1 and R1, set a time constant for the desired off-time in the UVLO circuit (if possible,
use the microcomputer to set the time constant by creating a delay time of the same period), and also,
set the gradient of the voltage increase R4, so that a soft start-up is obtained.
Turn on Tr3 by turning on the small signal Tr2 for set amount of time, and charge CL by applying a
(VIN-VOUT)/R4 current to OUT. The rush current will then be reduced.
<Remarks>
FAQ No.: 11S8520001
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-8520A20MC-AVFT2G | 功能描述:DC/DC 開關(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-8520A21MC-AVG-T2 | 功能描述:DC/DC 開關(guān)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(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-8520A21MC-AVGT2G | 功能描述:DC/DC 開關(guān)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(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-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(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 |
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