we have designed custom proto board based on tps23754evm-383.
we have followed the layouts as per the EVM
we dont see any output at the Tp13 with Tp3.. output voltage shows zero
we have measured voltages on EVM and our board and details are attached in the
excel spreadsheet.
looks like feedback is not working as gate is not firing and CTL is always 5v,
and T2P is not going low
Also we are not seeing any pulses on GAT or GAT2 pins (TP7)
Another interesting observation is that when we remove 1mH inductor(L3 in EVM) in Aux path,
we see GAT pulses but still the output is not seen
what could be the problem, how do we proceed with this debugging, need help
do we need to replace TL431A (U3 in EVM) with TLV431A as mentioned in this issue
http://e2e.ti.com/support/power_management/power_interface/f/204/t/132254.aspx
-venu