Dear all,
When operated by the following circuit by the customer, a phenomenon like the following measured waveform was confirmed.
〇No load
The customer confirmed that Vout started rising 100 μs before switching EN from Low to High as shown by red circles.
Switching is not started during the rising of this red circle. (See the measurement waveform below)
〇When a 1.6kΩ load is connected
As with no load, Vout rises as shown by red circle before 100 μs when EN is switched from low to high.
Then, it was confirmed that Vout fell at the timing when EN was switched to High (VREG5 rises).
It should be noted that an offset of 30 mV was also confirmed when a load of 60 mV and 1.6 kΩ was connected with no load when EN was low.
Please answer the following questions about the above phenomenon.
Is the above phenomenon caused by "Prebiased Soft-Start" of TPS54327? (It is not possible to explain that there is a change in Vout when a load is connected due to this characteristic, but I would like to confirm it just in case.)
If another factor seems to be possible, I would appreciate advice.
Best Regards,
Y.Ottey
