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How to convert 14.8V @ 10A Lipo battery output to 12V@10A ?
muthukural001:
Hello All,
I have been searching for a DC-DC converter to down convert my 14.8V,10000mAh battery output to 12V 10A current output. Since the cutoff voltage for 14.8V battery is 12.8V, the dc-dc converter is expected to regulate 12V even when the input voltage is 12.8V.But, I am not getting any dc-dc converter with above spec...Is there a dc-dc to do the above ?...If yes, please suggest...
I don't think that putting diodes that has 0.7v drop in series is a good idea for my design...Because, at 14.8V, I will get 12V but when the input voltage goes to 12.8V, the output after the diodes will be ~10V...Using a zener diode will not work for 10A load as there is no zener with that much power rating
ogden:
--- Quote from: muthukural001 on July 20, 2019, 11:56:37 am ---there is no zener with that much power rating
--- End quote ---
Right. ANY linear regulator or series diodes have to dissipate lot of heat, worst case 28W ((14.8V-12V)*10A). You would want to use powerful enough buck (synchronous rectification) converter.
muthukural001:
Hi ogden,
Thanks...I am looking for the buck converter to do the job...Do u know any Buck converter for this?.
MagicSmoker:
Synchronous rectification is of questionable value when duty cycle is >70%.
That said, there are plenty of cheap Chinese buck converters on Amazon, ebay, etc., rated for 12A or more. I make no claim as to their quality, etc., and I obviously don't know what might be easiest for the OP to obtain in his country.
One caveat: delivering 12V out at 12.8V in requires a duty cycle very close to 100% and many buck converters can't go above 90% or so because they use a charge pump (aka bootstrapped) gate driver for the buck MOSFET (which requires turning the MOSFET off every so often to recharge the bootstrap capacitor).
IconicPCB:
What will the converter drive?
Can the load tolerate the noise and ripple of a switcher?
Is a linear regulator necessary / essential?
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