[TPS2421-2] ISET PIN resistance setting range

Tiger Yeh

Expert 5505 points

Hi,

According to datasheet, the recommended resistance of ISET is 49.9 kΩ ≤ RRSET ≤ 200 kΩ.

However, the TPS2421 excel design tool is suggested to have Maximum RRSET as 44.485Kohm for 12V/4A output.

That means it is out of recommended range, is it okay if to choice 43.2Kohm for setting?

Best regards,

Tiger

over 9 years ago

0 Rakesh over 9 years ago

TI__Guru** 105661 points

Hi Tiger,

Can you please share the excel design tool with your input parameters, So that I can look into it and suggest

Best Regards,
Rakesh

0 Tiger Yeh over 9 years ago in reply to Rakesh

TI__Expert 5505 points

Thanks Rakesh.

Please find attached file.

Copy of TPS2421_Design_Tool_Rev-.xls

0 Rakesh over 9 years ago in reply to Tiger Yeh

TI__Guru** 105661 points

Hi Tiger,

Thanks for details.

Considering tolerances of fault and current limit thresholds, the equations to calculate RRSET are defined in datasheet Page 16 as follows. you can use 43.2Kohm as setting.

Best Regards,

Rakesh

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[TPS2421-2] ISET PIN resistance setting range