LM3658 I set

MichaelK

Intellectual 370 points

Dear sir,

As we know, we can connect different value resistor to control the charge current.

In my project, I want to set two situation, my mean is use two vaule in two case. How to implement it?

Can I implement it as the picture? When Vcontrol is low, Rset is R2. When Vcontrol is High. Rset is R1//R2.

Thanks!

over 12 years ago

0 Vincenzo Pizzolante over 12 years ago

TI__Mastermind 25306 points

yep, it should work...

of course R1 and R2 values are just "indicative", right?

Vincenzo

0 MichaelK over 12 years ago in reply to Vincenzo Pizzolante

Intellectual 370 points

Dear Vincenzo,

Thanks for your reply, I still have some doubt about it, Could you explain the inside of the Iset pin in detail?

BR,

Jinrong

0 Vincenzo Pizzolante over 12 years ago in reply to MichaelK

TI__Mastermind 25306 points

the pin provides a constant voltage: applying a R to GND a current is generate and internally senses, mirrored and used for the current settings purpose...

so changing the RISET you change the current settings... Internal schemes are TI - IP and I dread it would be hard to achieve them...

Vincenzo

Power management

Power management forum

LM3658 I set