Using USB type c power pack to power 12-24v chip amps

[Richard_James]

I only found few 5 watt class d amps that will power off 5v regular USB. But higher power amplifiers need 9v+. I am looking for around 20w per channel+40-50watt for subwoofer in 2.1 set up

I am building a pair of speakers and ideally want to eliminate all the wiring.

At the moment I have 2 speakers. One speaker will have a Ryobi battery and charger , amplifier and speaker drivers.

Was hoping to make things a little more delicate and integrate battery pack than can be charged with usbc..

Charging is no problem but how do I extract 12-18v put of the power pack. How to facilitate stable 12,18 or 20v DC current out of power pack to power the class d amplifier.

 

[Richard_James]

Or alternatively are there any class d amplifiers that are usbc powered.

 

[tomchr]

I'm thinking you'll need a USB-C power management IC of some sort. Last I looked at one of those I found one by TI. It had a register set that required some significant looking into in order to set up correctly.

Tom

 

[dangus]

There are charger modules which will boost USB-C 5V to charge up to 4S lithium-ion packs. Voltage is determined by the chip version, current by resistors. I bought a couple on Aliexpress, but haven't put them to use yet. https://www.aliexpress.com/item/1005003250663319.html
You should be able to run an amp directly off a 4S lithium pack; might be less watts than you've asked for, but I doubt you'd notice the difference.

 

[kevinkr]

USB C is capable of operation at voltages of up to 20V and currents of up to 5A. (PD mode is required)

More detail here: https://www.digikey.com/en/articles...c-and-using-power-delivery-for-rapid-charging

 

[Richard_James]

Researching.. found this module.
Seems like usbc to 9,12,15 and 20v. They seem to have all these options. With battery need to have over charge protection so battery stops getting current once charged and discharge protection so it does not drain to death.


https://www.amazon.com/JacobsParts-...87-d43f99920f86&pd_rd_i=B08NFKV2LD&psc=1&th=1

 

[Richard_James]

Well so If I use MacBook pro charger .. will the charger stop charging the 20v battery pack when it's full? Now need to find out how important discharge protection is..

 

[bohrok2610]

That module uses IP2721. It has some potential issues as it does not check the capabilities of the charger. See here:
https://hackaday.io/project/172187-ts100-flex-c-friend/log/179029-ip2721-version-built-but

 

[Richard_James]

Thanks for the tip. Don't want issues. At this point looking for a battery pack that is charged with usbc but also has a 12-24v output . Hope such battery packs exist

 

[Richard_James]

Something like this..would like to see more options . If anyone uses something like this let me know.

Now I just need usbc to 12v DC chip to charge the battery pack. And power the amp with one of the batteries outputs

https://www.amazon.com/TalentCell-Rechargeable-11000mAh-14500mAh-26400mAh/dp/B016BJCRUO

 

[bohrok2610]

The battery pack would need to support USB Power Delivery and your device would need also to support USB PD. E.g. by using IP2721.
However there are portable starters that have 12V or 19V output. E.g. https://www.telwin.com/en/prodotti/index.html?id=829566&lingua=E

 

[Richard_James]

Something like this but cheaper. And less juice. Don't need that much battery

https://www.amazon.com/TalentCell-Rechargeable-11000mAh-14500mAh-26400mAh/dp/B016BJCRUO

 

[Richard_James]

The battery pack would need to support USB Power Delivery and your device would need also to support USB PD. E.g. by using IP2721.
However there are portable starters that have 12V or 19V output. E.g. https://www.telwin.com/en/prodotti/index.html?id=829566&lingua=E

I was thinking of using a usbc to 12v DC chip to constantly power that battery pack and use 9v 1a output to power the amp .. but 1a sounds very little.

Can the portable charger be charged with usbc?

Edit: yes I see it has USB charge option.. very interesting

 

[bohrok2610]

It has a separate wallwart charger. I bought one myself last year for kickstarting frozen diesel powered car.

 

[Richard_James]

Here is another option. Almost perfect. Unknown brand. Not sure about quality

https://www.walmart.com/ip/LWLIUANG...ernal-Battery-Pack-Perfect-MacBook/1140847036

 

[Richard_James]

What will happen if I use 5v to power this amp?

https://www.amazon.com/gp/aw/d/B0B5WX9GJ2?ref=ppx_pt2_mob_b_prod_image
To drive these speakers
https://www.madisoundspeakerstore.com/approx-3-fullrange/peerless-830987-3-full-range-8-ohm/

 

[JMFahey]

You sure USB van supply that much power?

And why step down to 5V first (USB) and then boost to higher levels?

What´s wrong with straight getting, say, 19 to 24V from a laptop brick?
There you can get up to 60W RMS

The amp you show needs MINIMUM 9V so no way.

 

[bohrok2610]

You sure USB van supply that much power?

USB PD can deliver 100W (20V@5A). With USB PD 3.1 max is 240W. But currently there are not that many USB connectors or cables for those power levels.

 

[Richard_James]

5v because I can use a regular power bank with USB outputs and the abundant usbc Input to charge it.

I could not find reasonably priced battery pack that is charged by usbc and can also output 12, 15, 20v.

 

[Richard_James]

The battery jumper was close but then I think it needs to be charged with 12 or 19v charger. Not usbc.

The idea is to make things small and slick + use all those power banks I have lying around. All are charged with usbc and have USB outputs