Hello,
I'm trying to build a AA rechargeable battery charger. Targeted battery is duracell 1300mAh-1.2V and the board is TP4056. The board produces 4.12V ~ 4.2V and 1AMP output. I need to step down the voltage to 1.2 V. Board manufacturer suggested to change Rprog resistor R3 if you want to change the output voltage. Instead of changing R3, I would like to add a resistor at output to reduce the voltage. To calculate the dropped voltage I'm using this link.
Input Voltage = 4.2V
Output Voltage = 1.2V
Current Draw = 1A
It gives me a 3 Ohms resistor.
Q1 Am I on the right track or doing something wrong?
Q2 Is there a better alternative to do it. May be another board.
Q3 Is 3 Ohms resistor is the correct solution?
Regards
Prashant
I'm trying to build a AA rechargeable battery charger. Targeted battery is duracell 1300mAh-1.2V and the board is TP4056. The board produces 4.12V ~ 4.2V and 1AMP output. I need to step down the voltage to 1.2 V. Board manufacturer suggested to change Rprog resistor R3 if you want to change the output voltage. Instead of changing R3, I would like to add a resistor at output to reduce the voltage. To calculate the dropped voltage I'm using this link.
Input Voltage = 4.2V
Output Voltage = 1.2V
Current Draw = 1A
It gives me a 3 Ohms resistor.
Q1 Am I on the right track or doing something wrong?
Q2 Is there a better alternative to do it. May be another board.
Q3 Is 3 Ohms resistor is the correct solution?
Regards
Prashant