TPS43060: bootstrap diode selection guide - TI E2E

Thanks for your reply. The datasheet only told about the diode requirement that "the external diode should have a breakdown voltage rating greater than the output voltage". How about current requirement?

I see that TI EVM uses 100V, 1A schottky part. Since customer's design specification is different from the EVM, the customer users the "TPS/61 CCM Boost Excel Design Tool" and got passive components parameters according to the recommendation from the excel. For example, Cboot is 0.33uF +/-10% 50V part.

I think some current flow the diode at just truning on the low side FET and charging Cboot. So, average current may be not so big like 1A. But I'm not sure how big the inrush current is.

The customer is asking TI how to determine the minimum requirements of peak current, average current, peak surge current and Vf of the bootstrap diode. Is there any equation or theory for those parameters?

Could you please help me to support this question.
Regards,

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Hello John,Thanks for your reply. The datasheet only told about the diode requirement that "the external diode should have a breakdown voltage rating greater than the output voltage". How about current requirement?I see that TI EVM uses 100V, 1A schottky part. Since customer's design specification is different from the EVM, the customer users the "TPS/61 CCM Boost Excel Design Tool" and got passive components parameters according to the recommendation from the excel. For example, Cboot is 0.33uF +/-10% 50V part.I think some current flow the diode at just truning on the low side FET and charging Cboot. So, average current may be not so big like 1A. But I'm not sure how big the inrush current is.The customer is asking TI how to determine the minimum requirements of peak current, average current, peak surge current and Vf of the bootstrap diode. Is there any equation or theory for those parameters?Could you please help me to support this question.Regards,

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I have been working with my circuit a bit. See attached. The resistance in the pic is the actual resister readings. My issue is the line with 3.17volts in real life is showing 1.688volts. I know the program i have in the picture is perfect world but that is way lower then i thought it should be. If i take out the zenier diode i get 3. volts. So its keeping it from going over 3.3v but why is it keeping it so low and not around that 3.17volts? Sorry i am not an expert just a hobbyists working on a fun project.

The resister that is 9.78k will be a water temp thermister(i think its called) that will have a range from 115 Ohms to Ohms. I dont need the higher Ohms which will be very cold temps. My real world range i want to use is around 110 Ohms to Ohms (hints my 9.7k resister to test my protection circuit) . That being said if we get a really cold unusually cold winter it could drop the temp so the thermister gives me a voltage over 3.3v taking out the esp32 chip.

Thanks you all have been very helpful. I am learning a lot!!

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