B-G431B-ESC1 Max voltage

[Choibogue]

Is it possible to input 7S into a B-G431B-ESC1 EVM with a voltage specification that says up to 6S?
If not, if I replace some parts with a high rated voltage as below, can I input 7S into EVM?
 1. Power Section, TVS diode, SMM4F26A (D20) -> SMM4F33A
 2. Power Section, Capacitor, 15uF 35V (C27 to C40) -> (I will keep this.)
 3. Bemf Detection & Sensor Input, Schottky diode, BAT30KFILM (D10~D15, D17~D19) -> BAT48

 

 

 

Thank you!

[Peter BENSCH]

Please refer to this thread where almost the same question is asked.

Hope that helps?

Regards
/Peter

[Choibogue]

I saw your previous reply in the thread you linked.
If you ask me if I want to do it because I have a lot of work to do, like your previous reply,
I will do it. (even if I make custom PCB...)

What's important to me is,
can ST or equivalent guarantee that if I change EVM like this without any problems, I can safely achieve my goal(use 7S battery).

So, in order to input the voltage up to 30V, is it correct that I understand as below?

1. Power Section, TVS diode, SMM4F26A (D20) -> SMM4F33A
2. Power Section, Capacitor, 15uF 35V (C27 to C40) -> (I will keep this.)
3. Bemf Detection & Sensor Input, Schottky diode, BAT30KFILM (D10 to D15, D17 to D19) -> BAT48 ??? (Does this have to be replaced as mandatory? Or can I just leave it?)
4. I don't need to modify the L7986 related circuit. It originally supports up to 38V. However, I need to check the  voltage spec of C41, the input capacitor.
5. I need to change the voltage divider R68/R76 value for VBUS monitoring.

[Richard Li]

Hi, Choiboque,

Your maximum input voltage for 7S isn't right.

Do you know Lipo battery can charge to 4.35V for one cell?

Normally, design should give at least  +/-10%,

So if you want your design safe enough, you need count  7s for 4.35 * 7 *.1.1 ~ 33.5V.  

Richard