OPEN SOURCE: "CC-Boost" - 2.4 Amp boost driver - RC1

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

So basically, V15 rocks, as is, and works for every diode of interest (2.3A 445s, single mode 405s and 520s at the highest current those diodes currently go). That's more or less the message?

So why mess with a good thing, let's just finalize V15?

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

Yup, V15 is already good to go from what I can see

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

So can we start building V15 yet ? I'd like to build a few and see if I can parallel them. If I can that would solve my drive dilemma and I'd know how much room to allow for drives in this build.

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

I'm going to make an RC1 from V15, with the ability to adjust current.

CC-Boost RC1

It's RC1 time!

CC-Boost RC1



Eagle board and schematic are attached. This is the same basic circuit as V15, but with some layout optimization, and the introduction of a trimmer. Because it's so close in design to the V15 that ARG scoped, it's probably safe to make a couple of these and use them. However, before anyone commits to anything crazy, I would encourage some final scoping to make sure the beautiful clean signal we've seen above still holds true. From the looks of it though, this driver produces an incredibly clean output for both 2.4A 445s, and ~750mA single mode 405 and 520s.

The board is 13 x 12 mm, with some ambitious corner trimming (it looks kind of cool too). Part of the funky corner trimming actually comes from the shape of the inductor's pad.

It has two ranges, which are basically selected by using either 1 or 2 sense resistors. Both resistors are 0.15 Ohm (the same part) so the difference is simply whether you use 1 or 2. By using 2, you're paralleling them, and thus halving the sense resistance (allowing for higher currents). There are two proper sets of sense resistor pads (you're not just placing one resistor on top of each other):

• If you use 1x of the 0.15 ohm sense resistors (0.15 ohm sense resistance), you get 500 to 1250 mA
• If you use 2x of the 0.15 ohm sense resistors (0.075 ohm sense resistance), you get 1000 mA to 2500 mA

The parts list is in the schematic file, but I'm going to paste it here too. Something that someone who doesn't use Eagle could still help out with, is grabbing some pricing. I'm sure people will be curious to know what it would cost to make one of these. I'm betting it's still under $10 per driver in parts.

• INDUCTOR: SDR1105-330KLCT-ND - Bourns 33UH 5A Sat Current
• D1: 568-6753-1-ND - Diode Schottky 30V 5A
• C1: 445-8239-1-ND - 0805 47uF 10V
• C2, C3, C4: 1276-2908-1-ND - 0805 22uF 25V Capacitor
• R1: RMCF0603FT26K1CT-ND - 0603 26.1k Ohm Resistor
• RSENSE: RL12S.15FCT-ND - 0805 0.15 Ohm Resistor
• RSET: RHM309CFCT-ND - 0603 309 Ohm Resistor
• RTRIM: 3303X-501ECT-ND - TRIMMER 500 OHM 0.1W SMD
• IC1: FP6298
• IC2: ZXCT1009FCT-ND - ZXCT1009

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

Looks like it'd be closer to $5 per driver than $10. Cost of components from digikey plus the FP6298 from aliexpress would come to $4.69 USD at the 50 unit price break. Plus whatever the cost of the PCB would be. Components in single units would come to about $7 plus shipping and PCB cost.

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

adam1 said:

Looks like it'd be closer to $5 per driver than $10. Cost of components from digikey plus the FP6298 from aliexpress would come to $4.69 USD at the 50 unit price break. Plus whatever the cost of the PCB would be. Components in single units would come to about $7 plus shipping and PCB cost.

Click to expand...

PCBs are $0.40 cents each from Oshpark. So pretty bang on $5 in qty, or $7.50 for one at a time.

I forgot to mention (in case this wasn't apparent from the single GND wirepad), this is a continuous ground driver. IE, the V- and L- are continuous.

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

For whoever is interested, here is the digikey order for everything except the FP6298:
RHD boost-Digikey

Should the FP6298 just be ordered from aliexpress? I know lots of fake chips of varying types exist (RIP red diode after using a fake amc7135, didn't know it was fake at the time), just wondering if there is any risk of getting a ripoff IC.

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

crazyspaz said:

For whoever is interested, here is the digikey order for everything except the FP6298:
RHD boost-Digikey

Should the FP6298 just be ordered from aliexpress? I know lots of fake chips of varying types exist (RIP red diode after using a fake amc7135, didn't know it was fake at the time), just wondering if there is any risk of getting a ripoff IC.

Click to expand...

Just like on ebay, make sure you buy from a seller with a good feedback rating.

Aliexpresss, like ebay, is only as good as the seller you choose.

Name for the drive ? :thinking:
It's not the RHDV15ARG Drive ?

Thanks rhd, I'll get the pieces ordered today. :beer:

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

IWIRE said:

Name for the drive ? :thinking:
It's not the RHDV15ARG Drive ?

Click to expand...

I didn't do anything but hook it up to an oscope, this is all RHD's work

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

IWIRE said:

Name for the drive ? :thinking:
It's not the RHDV15ARG Drive ?

Thanks rhd, I'll get the pieces ordered today. :beer:

Click to expand...

I don't need my name in the driver.

How about SUDriver (meaning simply "Step Up Driver")? This initial RC1 could be referred to as "SUDriver R1".

EDIT: Maybe the "OSU Driver", for "Open Step Up Driver" ?

Pronounced kind of like 'OHZOO'

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

achoo drive?

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

crazyspaz said:

achoo drive?

Click to expand...

What's the meaning?

Re: OPEN SOURCE: New Boost Drive, 2.4A capable from one cell, tested and working

Heh just a joke, because you said "OHZOO" and achoo kinda rhymes and looks similar...and...yea ill just leave...

rhd said:

I don't need my name in the driver.

How about SUDriver (meaning simply "Step Up Driver")? This initial RC1 could be referred to as "SUDriver R1".

EDIT: Maybe the "OSU Driver", for "Open Step Up Driver" ?

Pronounced kind of like 'OHZOO'

Click to expand...

I like the SUDriver R1. Not that it matters what I like, just saying I like it better than OSU, go Cowboys ?