TPS92200D1EVM: What is the function of Rfb,how to design the value?

future chang1

Part Number: TPS92200D1EVM
Other Parts Discussed in Thread: TPS92200

Hi Expert

I am using TPS92200D1.

I see the Rfb connect to FB pin.

I do not know how to design Rfb value.

When will I put on the Rfb?

Could I just replace the Rfb with 0 ohm?

If I put on the Rfb, the current of LED is still the value Vfb / Rsense ?

best regards

0 Yuting Shao over 3 years ago

Hi Chang,

Thank for choosing TPS92200.

Rfb is used to measure the loop response and you can replace it with 0Ohm if you don't measure loop.

Since the FB is high impendence, so Rfb won't influence the Rsense value.

Robin

0 Steven Li over 1 year ago

For those who see this thread:

The previous answer is incomplete and misses some points.

Please refer to this new thread for a more complete answer: e2e.ti.com/.../tps92200d2evm-about-the-value-of-rfb

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