TPS63805: feedback resistor divider value (between FB and GND)

Yasushi Fujiwara

Part Number: TPS63805

Hi Experts,

The feedback resistor divider(between FB and GND) is limited less than 100Kohm. Would you please tell a reason why? If it is set to exceed 100Kohm what is happen?

Best Regards,
Fujiwara

over 3 years ago

0 Minqiu Xie over 3 years ago

TI__Mastermind 21565 points

Hi Fujiwara:

There is a FB leakage current into IC (Ifb). If the value of the resistance is too large, the additional voltage caused by the leakage current is large.

Here is an application note showing detail calculation.

https://www.ti.com/lit/an/slva450a/slva450a.pdf

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TPS63805: feedback resistor divider value (between FB and GND)