mehrshad

Hi,
Here is my high current linear regulator with virtually zero drop( 40mv @10A) with 3$ BOM in Iran and maybe 5$ in US!
The logic is simple. Tl431 compare the divided output with 2.5V ref. and command the NMOS via an 4pin opto like PC817.( CTR>0.5 please!)
IR1404 is so powerful and rated for 140A at 100C case temp with ON resistance <4mOhm @25C.
In this config. the positive wire of input is the common wire not the negative because NMOS is far better MOS in comparison with P types.
Tested with 12A and OK. (burst up to 50A)/ weight with cabels=36gr
Hope to be helpful.

init4fun

Some thoughts here ;

First thought , kudos for your willingness to assemble from discrete components a device that most would have no idea how to construct . The build it yourself aspect of hobby electronics is dead in our brave new world of 2015 where everything comes "plug N play" (God I hate that term) ....

Second thought , Why a linear regulator ? The circuit diagram you show is that of a very common linear regulator circuit and as linear regulators dump excess voltage as heat their efficiency goes down as power levels go up . A switching regulator circuit is far better in the power regulated VS power wasted aspect as the power reduction comes from the pulsed nature of the circuit rather than heating up a big chunk of aluminum . In applications where power wasted VS power regulated are no concern , like in AC mains derived power for home electronics for instance , sure , a linear reg gets it done quick and cheap , manufacturing wise . But when we're talking the finite resource of battery power , ANY power wasted in the regulation is unacceptable when a circuit exists that wastes next to no power at all .....

Final thought , by mentioning a selling price , you have now turned your post from informative to advertisement , and under the "no spam" rules here in the clubhouse this really isn't allowed . If you plan to sell these as you post seems to indicate , you must run an ad in the classified for sale section of the forum . Please remember , most folks see spamming as a scummy way to attempt a bit of sneaky free advertising and this will NOT inspire confidence in your potential customers if your first approach comes from a position of dishonesty .....

mehrshad

Dear Friend,
First of all thank you.
Second I am an expert of switching supply designer but linear regulator with 2s lipo has many advantages.
-Because the in/out diff voltage is 2v average its not that inefficient.
-It handle the pulse loads better(like large digital servos)
-its simpler and harder to fail
- it can supply huge burst current.the average current on planes is not that high but bursts could be.
-No RF noise generated

I wrote the BOM is 5$ not the sale price! and also considering the most valuable thing -Time- it will actually cost more than 5$ and I just decided to share some experience with those who need it.
If I took your valuable time, I'm sorry.
Regards

init4fun

No need for you to say sorry , you explained the informational nature of your post , rather than it being an advertisement , and you have MY apology for thinking you were selling them . And yes , no possible RF emission is highly desirable in an RC environment , that's a definite bonus for the linear reg .

Again , good job on the creativity of building it , we are likely among the last generations of electronic "do it yourself" people ....

mehrshad

Thank you....

mehrshad

It tested on the plane, no problem.