Hello team,
Can the TPS7A4001 be used as a constant current source similar to other LDOs? and if so is this the correct way of doing it?
Thanks in advance.
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Hello team,
Can the TPS7A4001 be used as a constant current source similar to other LDOs? and if so is this the correct way of doing it?
Thanks in advance.
Hi Panagiotis,
We often see this type of thing when applications are looking to drive LEDs and TPS7A40 is a great candidate for doing this type of thing because you can use a larger number of LED's in series due to the LDO's 100V capabilities.
Your example diagram is the most common way to do this since the LDO regulates the FB node to be equal to the internal reference. This means that you will always have a load of Vref/120.
You could also consider putting your constant load between the input source and the LDO input pin. Below are some reasons why you may want to consider this method, it was originally tailored for LEDs (as you can see in the block diagram) but it may be applicable to your load as well.
Thank you very much Kyle for the info, this is very useful for this and future projects
Cheers,
Panagiotis