Data Sheet

Voltage booster (step-up converter)

[Fig. 18 – Step up converter – voltage multiplier]

The circuit diagram is for advanced users of electronics and those experienced with

programming Arduino microcontrollers. It can increase voltage from 7V to 28V with ~90%

efficiency.

For this circuit diagram, you will need to:

1. Configure the board PWM frequency as high as possible (we recommend 8kHz)

2. Choose a high-quality, high-current toroid inductor (~470µH...2.2mH & <0.3Ω or similar

component)

[Fig. 19 – Toroid inductor]

3. Program the microcontroller so that the circuit automatically adjusts the duty cycle,

inversely proportional to the returning FeedBack voltage. Make sure to never reach more

than 80% of the duty cycle! Otherwise, you will short-circuit the coil. Also, your code

must disconnect the output(s) if the voltage exceeds 28V.

4. The feedback in the best case should be supplied to the following Arduino PINs:

5. *A3 or A4 when SW1 is up

6. *A0 or A1 when SW1 is down