1769-PA2操作簡單
1769-PA2
于激光雷達的eToF激光驅動器
EPC21601是一款邏輯控制電壓為3.3V、頻率高達200MHz、激光驅動電流可調制10A的激光驅動器。其開啟、斷開時間分別為410ps和320ps。作為一顆單芯片pluseGaNFET驅動器，EPC21601采用EPC的GaNIC專利技術、芯片級BGA封裝，尺寸僅有1.5mmx1.0mm。
EPC21601是一顆40V、10A的FET，用于驅動邏輯電平輸入為3.3V的VCSEL。“使用兩個獨立芯片而非單個芯片時，需要注意的是：兩個獨立芯片在驅動器和功率FET之間會存在大約50pH的電感，這50pH的電感會使速度減半。所以，即使是把電感減小到10pH或20pH，也是非常重要的。驅動器和功率FET的集成能將共源極電感減至10pH以下，從而改善脈沖的上升和下降時間，同時也改善了對近距離物體的分辨率。”Lidow說道。
EPC21601采用芯片級封裝（CSP），易于組裝，節省占板面積，提高整體效率。Lidow表示：“本系列產品將更快、更多地推動ToF技術進入終端應用。”他補充道：“超聲波傳感器的局限是無法探測距離小于30cm的物體，這與工作頻率有關。所以可以替換超聲波傳感器和近距離攝像頭芯片。”EPC21601就是專門為高速和短脈沖操作而設計的，同時幅度地減少了所需外部組件的數量。
在圖2和圖3中，Lidow展示了如何用一系列測試驗證新器件在高速應用中的有效性。“圖2中有一個10A、20V、9ns的脈沖序列，開啟時間約400ps，斷開時間約300ps，開啟和斷開時受電感限制，這種條件下能分辨非常近的距離。圖3是一個200MHz的脈沖序列。脈沖時間縮短為1.4ns，電流和電壓仍然是10A和20V。從圖中可以看出，斷開時間是245ps。”Lidow還補充道，根據圖2和圖3，新的激光驅動器IC可以配合ToF應用中任何對速度要求非常快的激光器技術。
Lidow提到還有一些比如EPC9154的開發板，具有eToF激光驅動ICEPC21601的特點，主要用來驅動短脈沖高電流激光二極管。其性能包括：最小脈沖寬度小于2ns、峰值電流大于10A、及30V母線電壓。EPC9154能利用電流脈沖驅動激光二極管，峰值功率達幾十瓦。用于激光雷達的激光二極管在設計時考慮到了這一點，但激光器封裝時的散熱限制則要求必須確認對脈沖寬度、工作周期和脈沖重復頻率的限制。
1769-PA2 rge
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