My Customer used TMS320F28374s as main controller for solar inverter, during the -25’C HBM 2KV test, customer reported that:
1) The I/O input voltage is between -0.3V ~ -0.4V, lower than the datasheet definition;
2) The tested the current would be 1.3A, which would overshot for the clamp current.
Could you kindly give comments for below information:
1) For the “Absolute Maximum Ratings” definition, if the I/O input voltage lower than -0.3V or the clamp current bigger than 20mA under low temperature, how long time should be prevented? us level or ns level?
2) How to evaluate the transient I/O overvoltage/ Overcurrent and ESD protection capability with which standard?
Expect for your reply, thanks.