TPS92641 -- IADJ pin control bandwidth?

kazola

Other Parts Discussed in Thread: TPS92641

Hi everyone,

I'm working on a project related to Visual Light Communication (VLC). My intention is to implement some kind of OFDM modulation to transmit data with LEDs. For my purpose, I have searched for a device with high power capabilities which allows varying the input LED current as fast as possible.

What I would like to know, and was unable to infere from the datasheet, is how fast the TPS92641 change its output current value as a response to the input current value incoming from the IADJ pin. Thus, I guess I am after what could be understood as the "tracking control" or the bandwidth of the control signal.

Thus, my question is twofold:

Can somebody indicate where can I find such value?
Also, do not hesitate indicating me if there is any other IC which you may find more appropiate for my purpose.

Please let me know your opinions and have a nice day!

over 8 years ago

0 Clinton Jensen over 8 years ago

TI__Mastermind 25500 points

It is a hysteretic part so it is fast. The actual bandwidth will depend on all of the external components to some degree, but in most cases it is well over 100kHz.

0 kazola over 8 years ago in reply to Clinton Jensen

Guru 18595 points

Very nice answer and very fast, thanks Clinton Jensen!

0 Clinton Jensen over 8 years ago in reply to kazola

TI__Mastermind 25500 points

I should have mentioned the COMP capacitor value is the main component that will determine bandwidth. So if you need high bandwidth use the lower recommended value of 100nF. You could likely go lower in a lot of applications, but that would just need to be tested in your particular circuit just to make sure it remains stable.

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TPS92641 -- IADJ pin control bandwidth?