过电流保护功能(VCE(sat) 检测)和内置有源米勒钳位功能

TLP5222,TLP5212,TLP5214A和TLP5214

我们介绍了一种具有内置VCE(sat)检测和米勒钳位功能以保护IGBT免受过电流损坏的智能栅极驱动光耦(TLP5222,TLP5212,TLP5214A和TLP5214)。VCE(sat)检测电路负责监测IGBT的VCE(sat)电压,如果发现存在过电流的情况即执行光耦输出的软关断。同时向控制器发送故障信号。米勒钳位功能将抑制栅极电位升高和IGBT故障,即绕过IGBT经光耦内部关断接地时产生的米勒电流。TLP5222,TLP5212,TLP5214A和TLP5214还集成了许多其它功能,包括全摆幅电压输出和UVLO功能。减少支持这些功能的外部组件的数量,有助于降低成本和减少PCB的尺寸。

集电极电压由DESAT引脚监测,当功率器件发生过电流时,VCE(sat)升高。当TLP5222,TLP5212,TLP5214A和TLP5214 DESAT引脚电压超过6.5V时,VOUT柔和地变低(软关断),同时向控制器发送故障信号。

智能栅极驱动IC光耦

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