TPS2492: Resistor during VREF and PROG

Kuramochi Tadahiko

Guru 28715 points

Part Number: TPS2492

Hi,

It is mentioned as below on the datasheet;

"If the constant power limit is not used, PROG should be tied to VREF through a 47-kΩ resistor."

My customer would like to use more little resistor.

Does it occur any problems?

Best Regards,

Kuramochi

0 Rakesh over 5 years ago

Hi Kuramochi,

Thanks for reaching out!

What is the value of resistor ? Can you share me the schematic.

BR,

Rakesh

0 Kuramochi Tadahiko over 5 years ago in reply to Rakesh

Guru 28715 points

Rakesh-san,

Thank you for your help.

I don't have the schematic.

Could you tell me the reason of the 47kΩ?

Best Regards,

Kuramochi

0 Rakesh over 5 years ago in reply to Kuramochi Tadahiko

Hi Kuramochi,

The value of resistor should not cause much problem.

Higher value of resistor causes drop due to Ibias (5uA through PROG pin), leading to voltage of 4V-R*5uA at the PROG pin.

BR, Rakesh

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