1A constant current LED driver w/PWM

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1

Hi all. I've come up with a couple constant-current LED drivers that can handle up to 1A and drive multiple LEDs with PWM. I've made a couple prototypes (work well with Arduino ProMicros) and would like to see if anyone is interested in using them for a project or two. If interested, please see http://braxtron.com

Here are the main features:
*Input voltage range 3V-22V
*200mA to 1A constant current output (user-selectable)
*EN/DIM input for Enabling and PWM dimming
*Ultralow shutdown current (40nA @ 5V input)
*Under-voltage lockout

Please feel free to either post here or contact me via email (info braxtron.com) if you have any questions.

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2

Do you have a proposed price in mind? Shipping from where? To where? A recommendation for a suitable power supply?

How bright are they?

3

Please see http://braxtron.com for details, price, etc.

They run well off of a single Li-ion or LiPo battery, or USB. The webpage has videos demonstrating this :slight_smile:

4

You should make some remark that this is an inductive driver and much more efficient than linear types.

Have you run any efficiency tests?

5

Will test the efficiency either today or tomorrow and post results here.

6

I just ran some tests with one Cree XM-L T5 LED. I'll do some more with 2+ LEDs in series, as the data sheet suggests that'll be more efficient:

200mA output
3.7Vin = 89.6% efficient (2.69Vout)
8.0Vin = 76.6% (2.73Vout)
10.4Vin = 73.7% (2.75Vout)

1000mA output
4.1Vin = 72.2% (2.73Vout)
8.0Vin = 69.4% (2.85Vout)
10.4Vin = 67.2% (2.86Vout)