Hi
I’m trying to build my own flashlight using a 1W-350mA-3V high power led, 1 amc7135 and a ion-lithium battery. When I connect the amc7135 to a 3.7 voltag regulator, it works fine. But when a connect it to the battery, the current rises to 650mA or so, do you know why does it happen? Do i need to use any extra component when using the battery?
Thank you very much for your help.
Hi and welcome Juanita.dlc. This thread is discussing these chips. Maybe it will be off some help if there not wired up correctly.
What battery are you using. If connected improperly, it may be running direct drive (bypassing the 7135 chip).
Hi
I’m ussing a rechargeable 18650 1S2P li-ion battery pack 3.7V 4400mAh, connected as specified in the amc7135 datasheet.
How, and where (what points in the circuit) are you measuring the current?
The datasheet:
http://www.micro-bridge.com/data/add/amc7135.pdf
indicates that absolute maximum sink current is 400 mA, so if you’re measuring 650 mA, you’re way over the max sink current. Do you have like a ton of heatsinking on the 7135? I have a hard time imagining that it would survive that much over spec :(…