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Tle7189F晶片的SCDL電壓設定範圍0.7-2.5V,晶片實際設計的短路保護電流怎麼計算或建議設定多大電壓? (某個外部MOSFET短路偵測的漏電源電壓監控立即啟動。短路偵測電平透過SCDL接腳的電壓設定模擬調整。施加到SCDL接腳的電壓與汲極電壓限制之間有1:1的轉換)

smartconx_target@Q!w2e3r4t5y6u7i8o9p0||/t5/%E9%97%A8%E7%BA%A7%E9%A9%B1%E5%8A%A8%E5%99%A8/Tle7189F%E8%8A%AF%E7%89%87SCDL%E7%94%B5%E5%8E%8B%E8%AE%BE%E7%BD%AE%E4%B8%8E%E7%94%B5%E6%B5%81%E4%B9%8B%E9%97%B4%E5%85%B3%E7%B3%BB/td-p/680598

1 解決方案
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Hello Samon,

這顆驅動晶片的短路檢測功能是透過檢測外部Mos管的漏源極電壓來識別是否處於過流/短路狀態的,也就是說SCDL電平要根據Mos管的特性進行配置。例如,要在1V漏源電壓下觸發短路檢測電路,SCDL接腳也必須設定為1V。參考規格書Page17.

The short circuit detection level is adjustable in an analogue manner by the voltage setting at the SCDL pin.There
is a 1:1 translation between the voltage applied to the SCDL pin and the drain-source voltage limit.Eg to trigger
the SCD circuit at 1V drain-source voltage, the SCDL pin must be set to 1V as well.The drain-source voltage limit
can be chosen between 0.7 ... 2.5V.

祝好

 

 

smartconx_target@Q!w2e3r4t5y6u7i8o9p0||/t5/%E9%97%A8%E7%BA%A7%E9%A9%B1%E5%8A%A8%E5%99%A8/Tle7189F%E8%8A%AF%E7%89%87SCDL%E7%94%B5%E5%8E%8B%E8%AE%BE%E7%BD%AE%E4%B8%8E%E7%94%B5%E6%B5%81%E4%B9%8B%E9%97%B4%E5%85%B3%E7%B3%BB/m-p/681528

在原始文章中檢視解決方案

0
2 回應
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Hello Samon,

這顆驅動晶片的短路檢測功能是透過檢測外部Mos管的漏源極電壓來識別是否處於過流/短路狀態的,也就是說SCDL電平要根據Mos管的特性進行配置。例如,要在1V漏源電壓下觸發短路檢測電路,SCDL接腳也必須設定為1V。參考規格書Page17.

The short circuit detection level is adjustable in an analogue manner by the voltage setting at the SCDL pin.There
is a 1:1 translation between the voltage applied to the SCDL pin and the drain-source voltage limit.Eg to trigger
the SCD circuit at 1V drain-source voltage, the SCDL pin must be set to 1V as well.The drain-source voltage limit
can be chosen between 0.7 ... 2.5V.

祝好

 

 

smartconx_target@Q!w2e3r4t5y6u7i8o9p0||/t5/%E9%97%A8%E7%BA%A7%E9%A9%B1%E5%8A%A8%E5%99%A8/Tle7189F%E8%8A%AF%E7%89%87SCDL%E7%94%B5%E5%8E%8B%E8%AE%BE%E7%BD%AE%E4%B8%8E%E7%94%B5%E6%B5%81%E4%B9%8B%E9%97%B4%E5%85%B3%E7%B3%BB/m-p/681528

0
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SCDL是透過Mos管的DS兩端電壓進行是否短路判斷的,所以電壓和電流的關於取決於外部驅動的Mos管的輸出特性。具體工作原理是:Mos管正常工作時DS兩端壓降很小,發生短路時漏極電流ID增大,Mos管兩端電壓也急速增加。驅動晶片透過對DS兩端電壓檢測進行短路判斷。參考規格書Page17 .

The short circuit detection level is adjustable in an analogue manner by the voltage setting at the SCDL pin.There
is a 1:1 translation between the voltage applied to the SCDL pin and the drain-source voltage limit.Eg to trigger
the SCD circuit at 1V drain-source voltage, the SCDL pin must be set to 1V as well.The drain-source voltage limit
can be chosen between 0.7 ... 2.5V.

 

smartconx_target@Q!w2e3r4t5y6u7i8o9p0||/t5/%E9%97%A8%E7%BA%A7%E9%A9%B1%E5%8A%A8%E5%99%A8/Tle7189F%E8%8A%AF%E7%89%87SCDL%E7%94%B5%E5%8E%8B%E8%AE%BE%E7%BD%AE%E4%B8%8E%E7%94%B5%E6%B5%81%E4%B9%8B%E9%97%B4%E5%85%B3%E7%B3%BB/m-p/684074

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