LMR36500: current (sink/source) required on pin 3 (EN/UVLO) of LMR36500

question 3

What is the sink/source current for pi 3 (UVLO) for LM5019.

Thanks,

henry

Hi Henry,

Henry Chow said:

Question1:

How much current (sink/source) is required on pin 3 (EN/UVLO) of LMR36500 to enable the device? I plan to use an optocoupler for controlling the EN/UVLO pin and need to know the source/sink current. 

See below:

Henry Chow said:

Questions2:

Does TI have any simulation tools for LMR36500 that I can use?

Here is a link of what we have on the product page for LMR36500:

https://www.ti.com/product/LMR36500#design-tools-simulation

We do not have a PSPICE file if that is what you are looking for.

Ben

Hi Henry,

Please create a separate thread for your question #3.

Ben

I notice the ILKG-EN in the spec before creating this thread. I am use to seeing mili Amp range for sink/source from other DC/DC converter enable pins. This being 8nA max is much lower than I was expecting. I create this thread to confirm that ILKG-EN (Enable input leakage current) is equivalent to Sink/Source current. When different manufacturer use different terms if makes my job more difficult.

So choosing an optocoupler with I-forward of 1.6mA with 100% Current transfer Ratio will be able to drive the enable pin high. AT 50% margin 1.6/2= 0.8mA is more then sufficient to drive the Enable pin of LMR36500 high.

Thanks for the help.