TPS2490: MAX slewrate is lower than MIN slewrate

Bjørn Brodtkorb

Part Number: TPS2490
Other Parts Discussed in Thread: CSD17570Q5B

Tool/software:

We use TPS2490 to power on a 10mF load. I have used the design calculator, but I get that the minimum slewrate is higher than the max slewrate. Does this mean I can not used the said part to power on my load. Attached is the calculator screenshot.

2 months ago

0 Avishek Pal 2 months ago

TI__Mastermind 38890 points

Please share the filled up excel design calculator.

0 Bjørn Brodtkorb 2 months ago in reply to Avishek Pal

Prodigy 20 points

TPS249x_8x_Design_Calculator_REV_B(1).xlsx

Thank you for the reply. Here is the calculator tool filled in with the wanted values.

0 Avishek Pal 2 months ago in reply to Bjørn Brodtkorb

TI__Mastermind 38890 points

CSD17570Q5B MOSFET is not suitable for your design specification. You should select a higher SOA MOSFET. This is a 30V MOSFET. Your maximum system input voltage is 28V. There is no margin here. Select a 60V good SOA MOSFET.

0 Bjørn Brodtkorb 2 months ago

Prodigy 20 points

Thank you for response.

So if I understand it correctly: both slew-rate min and max must be valid numbers, and min must be lower than max for the system to operate correctly?

+1 Avishek Pal 2 months ago in reply to Bjørn Brodtkorb

TI__Mastermind 38890 points

Correct. If you reduce the value of the COUT to 1mF, it will work fine.

0 Bjørn Brodtkorb 2 months ago in reply to Avishek Pal

Prodigy 20 points

Great to hear. We will find a better suitable MOSFET. Thank you for the help!

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TPS2490: MAX slewrate is lower than MIN slewrate