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過電流保護 (VCE(sat)檢測) 與內建主動式Millar clamp功能

TLP5214A

我們介紹一款利用VCE(sat)檢測與主動式Millar Clamp來保護IGBT不被過大電流損壞的智慧型閘極驅動光耦器件(TLP5214A, TLP5214)。VCE(sat)檢測功能負責觀察IGBT的VCE(sat)電壓,一旦判斷其電流過大,慢速關斷光耦器件的輸出訊號,同時發出故障訊號至控制器。主動Millar Clamp功能是,將當IGBT關電時所產生之Millar電流經由這顆內部的另一條繞道放電到地面,用以避免閘極電壓上升所引起之IGBT誤動作。TLP5214A和TLP5214亦整合了其它功能,包括全範圍電壓輸出以及UVLO功能。由於減少額外追加這類組件的數量,所以降低成本並且縮減PCB尺寸。

TLP5214A或TLP5214的DESAT引腳觀察IGBT的集極電壓,可判斷功率器件的電流過大時所造成之VCE(sat)升壓現象。當DESAT引腳電壓超過6.5V時,VOUT緩慢的關斷其輸出訊號(軟關斷),同時發出故障訊號至控制器。

智能型閘極驅動IC光耦器件

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