Boost circuit

nnaroon

Boost circuit [Copy link]

How can a DC boost circuit achieve multiple voltage levels? Can it be achieved by switching different FB resistors?

I don't know if my understanding is correct. The internal comparator controls the current to change the induced electromotive force of the inductor and achieve different voltages.

maychang

At least post the circuit you are using so that it will be easier to say whether changing which resistor can change the output voltage.

zdfsgsdgvx

At least post the circuit you are using, so that we can say whether changing the resistor can achieve the output voltage change.

nnaroon

maychang posted on 2022-8-4 18:06 At least post the circuit you are using, so that we can say whether changing which resistor can achieve the output voltage change.

Now it's just an idea. What I want to ask is whether it is possible to output multiple voltage levels by switching different FB resistors. If not, what circuit can be used to achieve this?

qwqwqw2088

The FB pin of the boost chip IC is generally the feedback pin. Adjusting the input voltage of the feedback pin sets the output voltage of the DC-DC.

Make sure to at least post the circuit you are using.

芯片量产找我

At least post the circuit to see which resistor can achieve the output voltage change.

xutong

The voltage divider value of the fb pin is fixed.

If the relative value of the voltage divider resistor on rfb1 is large, the output voltage will be relatively reduced.

The resistance of the voltage divider resistor on rfb1 is small, so the output voltage is naturally small.

I don't know if the host understands.

se7ens

The output voltage can be changed by adjusting the feedback resistor.

Of course, you have to actually calculate the output voltage range. All voltages within this range can be output.