Which Integrated Circuit (IC) Controls Low Voltage Cutoff/Protection (LVC/LVP)?

[InfamousFruitHunter]

I'm attempting to use a 36v battery with my 48v ebike controller. I've read from other threads that to decrease a controllers Low Voltage Cutoff/Protection (LVC/LVP), you need to change the resistance of a resistor divider. I, however, was not able to find out which integrated circuit (IC) monitors the battery voltage via the resistor divider.

My controller Model: KT48ZWSRKT-SJT02L (48V, rated 22A, max 45A, LVP 40v)
OEM: szktdz.com

IC's on the Main PCB (PCB Model: KTE-18S5-F):

- LM317T (linear regulator)(https://www.st.com/en/power-management/lm317.html)
- 78M05 (linear regulator)(https://www.ti.com/lit/ds/symlink/lm78m.pdf)
- STM8S105-C6 (micro-controller; quad flat package design) (https://www.st.com/en/microcontrollers-microprocessors/stm8s105c6.html)
- LM324 (quad operational amplifier)(https://www.st.com/en/amplifiers-and-comparators/lm324.html)

IC's on a Daughter PCB (PCB Model: KTE-QHE131028)

- LM339 (quad voltage comparators)(https://www.st.com/en/amplifiers-and-comparators/lm339.html)
- 8S003F3 (EEPROM)(https://www.st.com/en/microcontrollers-microprocessors/stm8s003f3.html)

I understand that the LM317T, 78M05, and 8S003F3 *may* contain resistor dividers themselves, but will not affect the LVP (therefore I won't be messing with those). However, I am unsure whether it will be the LM324, LM339, or STM8S105 that will have the resistor divider that I will need to tinker with.

Guidance would be appreciated. I have some electrical component experience and years of soldering experience. There are no trim-pots on the PCB's. I have images of the PCB if required (but I don't think is neccesary).

Thanks!!

 

[marka-ee]

I have KT controller also and would like to change LVC as well. I may be the cpu and one of it's analog inputs responsible for tracking the voltage. Even so, there should be a voltage divider for that somewhere.

 

[casainho]

I'm attempting to use a 36v battery with my 48v ebike controller. I've read from other threads that to decrease a controllers Low Voltage Cutoff/Protection (LVC/LVP), you need to change the resistance of a resistor divider. I, however, was not able to find out which integrated circuit (IC) monitors the battery voltage via the resistor divider.

My controller Model: KT48ZWSRKT-SJT02L (48V, rated 22A, max 45A, LVP 40v)
OEM: szktdz.com

IC's on the Main PCB (PCB Model: KTE-18S5-F):

- LM317T (linear regulator)(https://www.st.com/en/power-management/lm317.html)
- 78M05 (linear regulator)(https://www.ti.com/lit/ds/symlink/lm78m.pdf)
- STM8S105-C6 (micro-controller; quad flat package design) (https://www.st.com/en/microcontrollers-microprocessors/stm8s105c6.html)
- LM324 (quad operational amplifier)(https://www.st.com/en/amplifiers-and-comparators/lm324.html)

IC's on a Daughter PCB (PCB Model: KTE-QHE131028)

- LM339 (quad voltage comparators)(https://www.st.com/en/amplifiers-and-comparators/lm339.html)
- 8S003F3 (EEPROM)(https://www.st.com/en/microcontrollers-microprocessors/stm8s003f3.html)

I understand that the LM317T, 78M05, and 8S003F3 *may* contain resistor dividers themselves, but will not affect the LVP (therefore I won't be messing with those). However, I am unsure whether it will be the LM324, LM339, or STM8S105 that will have the resistor divider that I will need to tinker with.

Guidance would be appreciated. I have some electrical component experience and years of soldering experience. There are no trim-pots on the PCB's. I have images of the PCB if required (but I don't think is neccesary).

Thanks!!

Maybe you can install the KT OpenSource firmware!!

 

[InfamousFruitHunter]

Maybe you can install the KT OpenSource firmware!!

I don't know whether my controller supports the firmware, don't know if that would remove the LVC, and idk I don't really want to mess with it. I'd rather just change 1 resistor value and call it a day.