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High speed - High side current sensing

Question asked by jithin on Feb 15, 2017
Latest reply on Jul 13, 2017 by krisf


While designing a Laser Diode driver, I was searching for some high speed current sense device for a high side current measurement. 

The application is to protect the Laser Diode in the event of a High side MOSFET failure. In this case the Driver input voltage will directly appear on the switch node without any protection. The inductor is around 1.3uH and the output current is going to shoot up 16A /uS. At this level of current change, the requirement is to detect the over current and break the power within 500nS. (maximum rating of Diode, can not afford loosing diodes as its very expensive.)

I went through many datasheets for this applications like AD8210.

Any ideas?


Thanks and regards,