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LMG1020: VGS abnormal waveform in Lidar application

Ted Xu
Expert 4590 points
Part Number: LMG1020

Tool/software:

HI BU team 

LMG1020YFFR was used  to drive EPC2218A in my customer Lidar pre-study project.

Attached is the schematic as reference. 

Customer reported that GVS drops too slow to shutdown GaN MOS at red mark.  Below is the waveform as reference. Would you help share your comments and how to fix it?

Yellow curve-- VGS 

Red curves-- C1/C2 

Thanks 

  • 0
    TI__Genius 9760 points

    Hello,

    Can the customer try replacing the 1ohm R128045 resistor on OUTL with a 0 ohm resistor? It can help increase the turn off speed.

    Also make sure that the customer is using an optimized layout as described in the layout section of the datasheet where the GaNFET is placed as close to the driver outputs as possible.

    Thank you,

    Walter