Hi,
I have high voltage LED of 53 V (1,5 A) that I want to control with my Arduino, so I am planning to do this with an MOSFET transistor. My question is, how do I convert the 53 V that my LED needs to ≈7-12 V that my Arduino needs in the best way? Can I use a separate adapter for my Arduino, in that case what about common ground?
Thank you so much for all advice! 
You should use a constant current driver so the LE D does not overheat and get into a runaway current state and burn up.
Search digikey for led driver, will be like a switching regulator.
philipholger:
How do I convert the 53 V that my LED needs to ≈7-12 V that my Arduino needs in the best way?
Switching regulator power supply (aka switch mode power supply).
Never seen a 53volt LED.
Do you have a link.
Leo..
You need to tell us what your power source is. If say 12V battery you'd need a boost constant-current
DC-DC converter (with PWM input) to drive the LED and 12V could go straight to the Arduino.
Hi,
Welcome to the Forum
Power the arduino with a USB plug pack.
If using MOSFET to switch, make sure gnd of Arduino is connected to gnd of 60Vdc supply.
What is your electronics, programming, arduino, hardware experience?
Thanks.. Tom..
CrossRoads:
You should use a constant current driver so the LE D does not overheat and get into a runaway current state and burn up.
Search digikey for led driver, will be like a switching regulator.
Thank you so much for all of your answers! Do you mean that PWM will make the LED burn up? Do I have to use a constant current driver?
All the best,
Philip
MarkT:
You need to tell us what your power source is. If say 12V battery you'd need a boost constant-current
DC-DC converter (with PWM input) to drive the LED and 12V could go straight to the Arduino.
I have not decided what power supply to use. But say I have a 12 V input, how do I choose the right DC-DC converter? I guess one problem here is that I want 1.5 A as well.
TomGeorge:
Hi,Welcome to the Forum
Power the arduino with a USB plug pack.
If using MOSFET to switch, make sure gnd of Arduino is connected to gnd of 60Vdc supply.What is your electronics, programming, arduino, hardware experience?
Thanks.. Tom..
Thank you! I have some experience, but mainly theoretical since I've been studying Automation and Mechatronics (The education was not very practical). I have been using Arduino quite a lot but I never had the need for an external power supply before so this is my first MOSFET experience.
You will get the right answers to all your questions quicker if you tell us what sort of LED we are talking about.
There are no 53volt/1.5Amp LEDs.
Power LEDs are normally 3.3volt.
Higher voltages are needed if there are several of these mounted on a carrier (COB LED).
COB (chip-on-board) LEDs are usually up to 10 LEDs per string, so a Vf of ~33volt.
Hard to find CC boost LED driver boards over 45volt.
Look at this 100watt COB LED.
~33volt/1.5A
You have to use a CPU cooler (with fan) to use these.
Leo..
Wawa:
You will get the right answers to all your questions quicker if you tell us what sort of LED we are talking about.
There are no 53volt/1.5Amp LEDs.
Power LEDs are normally 3.3volt.
Higher voltages are needed if there are several of these mounted on a carrier (COB LED).
COB (chip-on-board) LEDs are usually up to 10 LEDs per string, so a Vf of ~33volt.
Hard to find CC boost LED driver boards over 45volt.
Look at this 100watt COB LED.
~33volt/1.5A
You have to use a CPU cooler (with fan) to use these.
Leo..
Yes there does exist LEDS with higher voltage. The LED I want to use is a SHARP LED called GW5DME27MR5
Or have I misinterpreted it totally? :s
All the best,
Philip
Hi.
Thanks for telling us the make and model number...
http://www.mouser.com/ds/2/365/2012_LED_Product_Brochure-219551.pdf
Tom...
A discontinued product.
This is a COB LED (LED array) of probably 15 LEDs in series and several of these strings in parallel.
Unwise to experiment with, because of the higher voltage needed.
Boost drivers, running on a low voltage supply are hard to get for this voltage and/or are expensive.
Only mains voltage step-down drivers will be affordable.
Better stick to the <=12-string COB LEDs.
Leo..