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TPS62420: calculation of feedback resistors

Part Number: TPS62420

Hello,

I'm using the TPS62420 for converting 5V to 2.5V/0.19A

I'm using figure 14 as a reference.

I've calculated R21=887Kohm and R22=280Kohm.

I've also noticed the commend on p.21 sating that the two resistors should be around 1Mohm.

In my case it's about 1.16Mohm..

I've also noticed that in the example on figure 14 below the sum of the two resistors is 1.045Mohm

1. Is it safe to work with these current resistors values ?

2. Can you please explain the 1Mohm limitation on the datasheet ?

Regards,