We can see the Start-up condition voltage of TPIC74100-Q1 and TPS55065-Q1. That is 5V(Max.). What is this voltage?
The start-up condition voltage in the parametric table is confusing. It should probably be 5V minimum, instead of maximum. The device will not start-up until Vdriver reaches 5V. The internal circuitry runs off of Vout after power-up has occurred, so the device will continue to work if Vdriver drops below 5V.
Hello Mr Cosby,
Someone asked about the start-up condition voltage of the TPIC74100-Q1 a while ago and you replied this:
ThomasCosby The start-up condition voltage in the parametric table is confusing. It should probably be 5V minimum, instead of maximum. The device will not start-up until Vdriver reaches 5V. The internal circuitry runs off of Vout after power-up has occurred, so the device will continue to work if Vdriver drops below 5V.
I've noticed this start-up condition voltage when doing some tests with the TPIC74100 evaluation module, I agree the device won't start till Vdriver>5V (even a little bit more depending on the load).
I would like to know if there is any way to reduce the value of this start-up condition voltage. I've carefully read the TPIC74100 datasheet, hoping maybe to find something about changing some components values but I haven't found anything.
Thank you in advance.
Jean
We cannot reduce the start-up voltage, because the internal logic runs off of 5V. The device can run off of its' output voltage after it is regulating.
RegardsTom
Fair enough, thanks a lot for your quick answer!