LM25148-Q1: Minimum resistance value of RT

Isao Takigasaki

Expert 3040 points

Part Number: LM25148-Q1

Hi,

Does RT of this device have a limitation in the minimum value?

If RT = 8k ohm, What is the switching frequency?

Best Regards, Taki

9 months ago

0 David Baba 9 months ago

TI__Mastermind 33640 points

Hello Taki,

Suggest staying within recommended frequency setting range with a max Frequency setting of 2.2MHz.

David.

0 Isao Takigasaki 9 months ago in reply to David Baba

TI__Expert 3040 points

Hi David,

I understood.

I want to know the device behavior if RT is lower than 9.52k ohm.

Best Regards, Taki

0 David Baba 9 months ago in reply to Isao Takigasaki

TI__Mastermind 33640 points

Hello Taki,

Should be fine to go over 2.2MHz. behavior will be normal RT=8k.

Hope this helps.

David.

0 Isao Takigasaki 9 months ago in reply to David Baba

TI__Expert 3040 points

Thank you for your quick response.

I expect the switching frequency should be saturated at individual maximum frequency at 8k ohm.
Do you have any number for the maximum frequency? Should it be 2.7MHz as shown in below?

Best Regards, Taki

+1 David Baba 9 months ago in reply to Isao Takigasaki

TI__Mastermind 33640 points

Hello Taki,

Keep below 3MHz.

Hope this helps,

David

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LM25148-Q1: Minimum resistance value of RT