How to detect the range of input voltage?

[shaq]

Dear all,

I'm studying the charge pump LED driver of CATALYST Semi.
In the data sheet, we can see the "Mode control" block.
I guess the left side is to monitor the input voltage to switch 1.33x, 1.5x or 2x whatever.

But I don't understand how to design range detecting of input voltage.
Anyone helps me?

Data sheet: **broken link removed**

 

[krishna73v]

Dear shaq

There is no need for you to design range detection of input voltage.

The IC internally takes care of it.

if it feels the input is not sufficient to drive your LED's it will automatically pump up the voltage and if not required it will get back to normal.

You just have to programme how much current drive is required for your LED's and the IC takes care of the rest.

 

[shaq]

Dear shaq

There is no need for you to design range detection of input voltage.

The IC internally takes care of it.

if it feels the input is not sufficient to drive your LED's it will automatically pump up the voltage and if not required it will get back to normal.

You just have to programme how much current drive is required for your LED's and the IC takes care of the rest.

Dear krishna73v,

Why does it not need to design the range detection circuit?
I still understand what you say.
Would you mind to say it clearly?