Ulrich:
Maybe this result is at the root of the no RUN case
Our proto3 gives VDD just at 17.5v
But HVG voltage drops to <10V see attached screenshot.
In the eval, we see VDD 18.5V and HVG >10.5V
What would cause this difference when the circuitry involved is so little? I initially thought it is related to the depletion mode current capability. And higher caps used in ref(which is now .22uF & it gives REF to 5V)
Is it possible that the controller times out even before caps are charged?
But that is not possible because our caps on VDD are less than eval kit.
Could these lower values of VDD & HVG be the issue for not seeing the RUN? or Not enough VDD cap?
How do we get to the eval kit values above?prt3_vdd_hvg.pptx
robin
