Maker Pro
Maker Pro

LED Array Power Source

J

James Roberts

Jan 1, 1970
0
I wish to power the below LED array:

http://www.sunbriteleds.com/images/pdf/SSP-LXC206650B.pdf

for continuous use with maximum brightness, without burning
out the LEDs.
I am curious, what would be someone's recommendations for
voltage and current ratings on an AC adapter, as well as
the resistor value?
I will probably use a standard wall wart, regulated, at
a common voltage and current rating.
I could experiment, but I don't want to blow $30 on a
paperweight.
Thank you for your time.
James Roberts
 
B

Ban

Jan 1, 1970
0
James Roberts wrote:
|| I wish to power the below LED array:
||
|| http://www.sunbriteleds.com/images/pdf/SSP-LXC206650B.pdf
||
|| for continuous use with maximum brightness, without burning
|| out the LEDs.
|| I am curious, what would be someone's recommendations for
|| voltage and current ratings on an AC adapter, as well as
|| the resistor value?
|| I will probably use a standard wall wart, regulated, at
|| a common voltage and current rating.
|| I could experiment, but I don't want to blow $30 on a
|| paperweight.
|| Thank you for your time.
|| James Roberts

If you use this current source, you do not necessarily need a stabilized
supply. The total current is a bit more than 250mA. With the multimeter you
can measure the emitter voltage and then calculate the resistor for exactly
300mA, or whatever your array allows. The red LED is not only a voltage
reference but serves as a remote indicator too.
Build the circuit and then test it with a 33R/5W resistor instead of the
array. With 300mA the voltage should be 9.9V across the resistor.
Choose a wallwart of 500mA 12V at least. The transistor can be any NPN-small
power type of Ic=1A, Pt=1W in free air and hfe>100.

+---------+-------o+13...17V
| |
.-. o+
| | LED-cluster
750| | o-
'-' |
| |/
1.9V +-------| BD135-16
| |>
| |1.2V
| .-.
red LED(V) | |
- | |4R7/1W
| '-'
| |
+---------+-------o GND
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de
 
S

Spehro Pefhany

Jan 1, 1970
0
I wish to power the below LED array:

http://www.sunbriteleds.com/images/pdf/SSP-LXC206650B.pdf

for continuous use with maximum brightness, without burning
out the LEDs.
I am curious, what would be someone's recommendations for
voltage and current ratings on an AC adapter, as well as
the resistor value?
I will probably use a standard wall wart, regulated, at
a common voltage and current rating.
I could experiment, but I don't want to blow $30 on a
paperweight.

Be sure to derate the operating current to maybe 200mA total to allow
for Ta>25°C.

Best regards,
Spehro Pefhany
 
P

Peter Lowrie

Jan 1, 1970
0
Gee, thanks Spehro.
The data seems a little.. sparse.
Intentionally.

What's the principle of operation of your invention?

PWM, thermocouple, current shunt. If you care to email me I would like to
provide more detailed help.

Kind regards
Peter Lowrie
 
Top