Understanding the difference between Linear, Buck, Boost and Direct Drive drivers

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wight
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lagman wrote:
Ok, I agree with you. I wasn’t thinking that the VDD of the 7135 chip is powered by the MCUSmile
Smile

Still fine, still on a break. One day I’ll catch up with you folks! previous wight catchup Wink
list of my drivers & variants (A17DD, FET+1 stuff, WIP stuff, etc)

Rufusbduck
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Great read you guys!

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seasam
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great read. if only I had read this a few months ago. would have saved me a lot of time :bigsmile:

quickster47
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What a great wealth of information. Thanks for taking the time to compile it and share it with us who are light challenged. Smile

Carl

Genesis 1:3 And God said, “Let there be light,” and there was light.

flashination
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Excellent resource. Beer

 

 

 

 

 
 
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AnhTran
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Thank you lagman for your great explanation!! I’m new to this forum and have been searching for a completed guide about flashlight driver but I haven’t found yet.
Could you draw simple circuit diagrams of some popular drivers and explain its components/ how it’s work..?
I have some knowledge in electrical physics but not in electronic components, the driver boards are too complicated to me Facepalm

DoubleA
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So will a linear regulator have better efficiency when using a IFR (LiFePO4) cell than ICR,IMR or INR since it is about 3.2V nominal?

and on the first day he said "Let there be light"...

kemakara
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Quote:
Boost

This is also called a step up driver. and is part of the SMPS (link is external) (Switched Mode Power Supply) family.
It is easily recognizable thanks to the big inductor. Sometimes the inductor is black.

This is very similar the the Buck driver, but as its name implies, it will increase the voltage.

A boost converter (step-up converter) is a DC-to-DC power converter that steps up voltage (while stepping down current) from its input (supply) to its output (load). Step-up switching converters, also called boost switching regulators, provide a higher voltage output than the input voltage. The output voltage is regulated, as long as the power draw is within the output power specification of the circuit. Many of our step-up switching regulators are designed for driving strings of LEDs.

If your step-up/boost application is not power intensive (IOUT < 0.5A), you may prefer a different power conversion technology for boost applications.

joker145
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I would like to build a quad for solarforce with an extension tube. What driver can I use? Is it possible? Planning on buying my parts from mtn. Thank you.

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KawiBoy1428
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joker145 wrote:
I would like to build a quad for solarforce with an extension tube. What driver can I use? Is it possible? Planning on buying my parts from mtn. Thank you.

What size driver would you need? Is it a 3volt LED quad your building? Is it for a P60 drop-in type (17mm driver)? You can get a 2S 3volt 17mm driver @ 5.5amps as long as you have 6+mm of clearance for the Coil Craft Inductor from RMM.

http://www.mtnelectronics.com/index.php?route=product/product&path=67_11...

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BlueSwordM
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@joker145, use a buck driver.

This will allow for fully regulated brightness with 2S over the course of the entire runtime.

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joker145
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Yes 3 volt led, and a P60 drop in that I bought from Kiriba-ru

Would like to use nichia led.

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joker145
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Thank you, also I can use one cell if needed?

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KawiBoy1428
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joker145 wrote:
Yes 3 volt led, and a P60 drop in that I bought from Kiriba-ru

Would like to use nichia led.


The driver I linked is the one you want. You have to go with the Coil Craft Inductor to get 5.5amps 3amps is Max for the standard inductor.

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virencelights
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does a boost driver at 9Amps Turbo, go into direct drive?.
am I wrong ?.

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SammysHP
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A boost driver cannot go into direct drive.

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