PWM - Frequency

[FINNIX]

Hi all,

I need an output of 4 volts from an IMR 4.2V battery so I'm looking for a chip, mod or board that has accurate pulse-width modulation. Was thinking of using a VV Gripper but if I can just buy the actual modulator the better.

Any ideas welcome please.

 

[twgbonehead]

You mean something like this:

$24.78 HANA MODZ Pack DNA 30 Style Mod VW Modules - 7-30W at FastTech - Worldwide Free Shipping

 

[FINNIX]

You mean something like this:

$24.78 HANA MODZ Pack DNA 30 Style Mod VW Modules - 7-30W at FastTech - Worldwide Free Shipping

Maybe, would you know if this has smooth (high frequency) variable voltage?

 

[rhelton]

Variable wattage-flat d/c signal

 

[dr g]

Maybe, would you know if this has smooth (high frequency) variable voltage?

Don't bother with that when you can get a genuine.

 

[Rickajho]

Hi all,

I need an output of 4 volts from an IMR 4.2V battery so I'm looking for a chip, mod or board that has accurate pulse-width modulation. Was thinking of using a VV Gripper but if I can just buy the actual modulator the better.

Any ideas welcome please.

Not sure what you are asking for. Do you need a board that can produce 4 volts period or do you want a board that only does it via PWM for some reason?

 

[FINNIX]

Not sure what you are asking for. Do you need a board that can produce 4 volts period or do you want a board that only does it via PWM for some reason?

I have an IMR 4.2V battery, I want to output a consistent 4V, ideally via PWM as I've read this is the most efficient.

 

[DrMA]

I have an IMR 4.2V battery, I want to output a consistent 4V, ideally via PWM as I've read this is the most efficient.

Is this for a custom mod, or another application not related to vaping?

In any case, what you're looking for is a buck/boost DC/DC converter, because your battery will start at 4.2V when fully charged which will need to be lowered to your desired 4V output; however, as the battery gets drained its voltage will drop towards its nominal value of 3.7V, in which case you'll need to boost the output to 4V. For vaping, there are several pre-built modules that will do that such as the DNA30, SX350, ZMax... For non-vaping applications, search mouser or digikey for buck/boost converters matching your desired specs.

 

[FINNIX]

Is this for a custom mod, or another application not related to vaping?

In any case, what you're looking for is a buck/boost DC/DC converter, because your battery will start at 4.2V when fully charged which will need to be lowered to your desired 4V output; however, as the battery gets drained its voltage will drop towards its nominal value of 3.7V, in which case you'll need to boost the output to 4V. For vaping, there are several pre-built modules that will do that such as the DNA30, SX350, ZMax... For non-vaping applications, search mouser or digikey for buck/boost converters matching your desired specs.

Thanks, I'm assuming a buck uses PWM? Also are such chips amp limited?

 

[DrMA]

buck/boost converters almost always use PWM. You'll need to read the spec sheets of particular models for the details on the PWM frequency and filtering, as well as limitations on current/power, input/output voltage ranges, etc.

FIY - Buck-only converters may be linear (i.e. resistive).

 

[Mike_S]

I wouldn't get too hung up on the actual PWM frequency of a switching regulator. If it's designed correctly, the output should be relatively smooth from the LC filter.

Linear regulators sometimes get mislabeled as buck converters, but they're two different types of circuits.