Custom AMC7135 Driver

[tivo532]

@BhSimon

@tivo532

We can do it together if you like. I’m thinking of using a 20pin SSOP part but might be hard
to put/layout it in a 17mm board.

I’m up for a challenge, although even the abbreviation SSOP is beyond me. I’m sure I’m out of my depth.

Let me start another topic/thread for this and see if we can do it. I’ll let you know and provide you a link.

Here’s the new topic/thread:

[PilotPTK]

Unless you're just up for a masochistic challenge, don't go too crazy on this. I've got something in the works that should be at least somewhat reasonably priced.. To be announced in the next 7-10 days..

[Pulsar]

well, add one to that order. im up for any custom made driver that i dont need to sell my one off titanium piece to buy.

stuff like this makes me wish i did something with my life besides watching the bright light, hanging iron and turning bolts

[tivo532]

@PilotPTK

Unless you’re just up for a masochistic challenge, don’t go too crazy on this. I’ve got something in the works that should be at least somewhat reasonably priced… To be announced in the next 7-10 days…

Great! Thanks PPtk.

[PilotPTK]

@tivo532

@PilotPTK

Unless you're just up for a masochistic challenge, don't go too crazy on this. I've got something in the works that should be at least somewhat reasonably priced.. To be announced in the next 7-10 days..

Great! Thanks PPtk.

Posted in this thread

The World's Most Advanced AMC7135 * 8 Driver

Haha.. Alright, I'm not really sure it's the world's most advanced, but It's pretty awesome.. And yes, it will be available for purchase to people in the BLF community.. So, what is it? 17MM Diameter (Technically, 16.8MM +/- 0.1MM) 8*7135 (380mA each) 3.04A Driver Each AMC7135 Individually addressable (means 8 Steps of Brightness with ZERO PWM) Optional PWMing of one chip gives 1023 levels of brightness in between EACH of the 8 Steps above When in use, PWM Frequency is 7.8Khz FULLY Programma…

Not quite ready for sale, but it gives you an idea of what I'm up to....

PPtk

[benz]

@budynabuick

…I don’t think that price ($25) is crazy at all…

Me either. I am very willing to pay for a quality product.

[windketch]

Hello PilotPTK and everyone else at thius forum -

I’m new to forums. If this question is not appropriate or posted in the wrong lace, please let me know. I was given some LED driver boards by the principal scientist on a research project I’m working and was told that their use was absolutely essential for a prototype used in our experiment. These are small circular board purchased from DealExtreme by my predecessor. Each board has three AMC7135 drivers and other associated parts.

My question is this…I have to drive a blacklight LED (around 365nm). I have the datasheet for the chip, buy I don’t know how to choose the best match in an LED. What are the critical datapoints I should be matching up between the chip data and the LED data?

Any help that any of you can render will help make life bearable again.

Thanks,
windketch

[PilotPTK]

The AMC7135 is a linear current regulator. It's capable of dropping excess voltage from its input to match the Vf of an LED at 350mA (Per AMC7135).

Based upon this, your input voltage must be higher than the LED voltage in order for the AMC7135 to regulate properly. Being a linear regulator, however, it drops the excess voltage as heat, so you don't want an input voltage that is too much higher than the LED Vf.

Pretty much every single specification in the AMC7135 datasheet is relevant. You have to pay attention to temperature rise based on the number of watts you're burning off as heat, absolute maximum input voltage (6V is memory serves), and you'll need to decide how many AMC7135 chips to use to power your LED to the drive level you're trying to attain.

If you have specific questions, I or someone else will be happy to answer them. Asking what the crucial data points are, however, is an impossible question since we don't know your requirements, your application or what is critical to you. What one person considers crucial, you might consider meaningless. The reverse could also be true.

PPtk

[scaru]

@PilotPTK

You have to pay attention to temperature rise based on the number of watts you're burning off as heat, absolute maximum input voltage (6V is memory serves), and you'll need to decide how many AMC7135 chips to use to power your LED to the drive level you're trying to attain.

PPtk

One comment, the datasheet recommends 2.7 to 6 volts, but but the absolute max rating is 7 volts.

[windketch]

Hi Pilot PTK -

Thank you very much for pointing me in the right direction. I’ll give it a go working it out from this starting point.

regards-
windketch