Electronics > Beginners

Led current sense indicator help

(1/3) > >>

kentfielddude:
Hello. I am designing a usb quick charger. I am using the uP9616PDC8 ic. I have a working prototype based on the datasheet. I want to add a led that turns on when current is flowing through the charger.  The uP9616PDC8 uses a current sense resistor for CC mode and over current protection. I am using a 0.039Ohm sense resistor. I think I need to use a opamp to detect the voltage across the sense resistor to switch on a transistor to drive the led but I'm not sure how to do this. I'm a noob so any help would be much appreciated.

link to datasheet: https://lcsc.com/product-detail/PMIC-Battery-Management_uP9616PDC8_C92690.html

oPossum:
I think a LED + resistor in parallel with L1 would show when the buck converter is operating and the battery is being charged.

kentfielddude:
the output voltage varies from 3.6v to 12v.

oPossum:
I misunderstood the purpose of this chip. Thought it was a charger chip. Since this supplies voltage to a USB powered device, I don't understand the need to detect current draw. It won't be an indication of charging. The device it supplies power to will show that.

oPossum:
Something like this may work...

http://www.ti.com/lit/ds/symlink/ina381.pdf

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version