Sold/Expired High efficient 5A/9A Buck Converter for SST-50, SST-90

Der Wichtel

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Mar 12, 2007
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High efficient 5A/9A Buck Converter LED Driver for SST-50, SST-90



The wait is finally over.

There are two driver versions: 5A and 9A (please specify while ordering).

Here are the specs:

- High efficiency ( 94% - 98%)
- Input voltage range: 6V-22V
- Output current: fixed to 5A or 9A
- The input voltage must be at least 2V higher than the output voltage, otherwise output current will get lower.
- 1mm² silicone wires preinstalled
- Diameter: 26mm
- Height: 13mm

The driver must be potted to the heatsink, at least if output power goes over a single SST-90.

More information can be found in the datasheet:
http://www.wichtel.kilu.de/images/usr_data/pdf/PowerBuck_DS.pdf
Please read it until the last page

and as always please contact me via pm or email for order information.
mail.gif


Price:
standard version 35 Euro
adjustable version 41 Euro

Shipping:
( only has to be paid once each order)
- Germany 2.20 Euro
- International 3.45 Euro

- optionally registered mail 2.15€

Shipping can take a little bit longer because soldering these drivers became much harder
 
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Icarus

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Re: High efficient 5A/9A Buck Converter

I'll take one (5A).

:paypal:
 
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SmurfTacular

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Orange County, CA
Re: High efficient 5A/9A Buck Converter

NICE!!!! :thumbsup: Can't wait to get a hold of one! :naughty: I'll definitely buy one when I get my funds together.
I have a few questions if you don't mind.

Will these be available with multiple modes? Or even (as donn mentioned) a potentiometer/dimmer?

What gauge of wire would you recommend? is 18 gauge OK?

How exactly do you mount the driver onto the heatsink?
 
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Der Wichtel

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Re: High efficient 5A/9A Buck Converter

Hi,
unfortunately it is not possible to dim the output.
The regulation is a little bit complex so that simple pwm won't work.

the dimming part on this one will be as difficult to realize as the driver part. I'm working on it and I already have two ideas of how to do it.

One simple way and one much more difficult. The circuit for the simple way is already on the driver but I don't think it will work that easy. Well only a test will clarify which way will work.

The more difficult way will be able to use a potentiometer AND a microcontroller.

Good night

EDIT: 18 gauge / 1mm heat resistant silicon wires are preinstalled. Potting can be done with Arctic Alumina for example.
I'm using epoxy mixed with 65% aluminiumoxid which works very good for this. Besides of that it is cheap
 
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TorchBoy

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Jan 15, 2007
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New Zealand
Re: High efficient 5A/9A Buck Converter

Here are the specs:

- High efficiency ( 90% - 98%)
- Input voltage range: 7V-20V
- Output current: fixed to 5A or 9A

...

More information can be found in the datasheet:
Datasheet ( let me know if there is something unclear or somthing I should add )
The datasheet appears to indicate 6 V to 20 V and 5.6 A or 8.6 A. Which is it?
 

Der Wichtel

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Germany
Re: High efficient 5A/9A Buck Converter

The datasheet appears to indicate 6 V to 20 V and 5.6 A or 8.6 A. Which is it?

It should be 6-20V.

The efficiency tests were done with 5.5A and 8.6A because I did not have the correct current setting resistors during the test. However the results are similar.

Just saw that you have a list of drivers. Nice work!
So the correct values for your table are:

Vin: 6-20V
Number of LEDs: 1-4
Efficiency: 90%-98%
Output Current: 5A / 9A
Number of Modes: 1
dimension: 26mm diameter, 13mm high
 

Der Wichtel

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Mar 12, 2007
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Re: High efficient 5A/9A Buck Converter

The cut off voltage is 4.5V.
If the voltage is below 6V output current will decrease slightly
 

lucca brassi

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Feb 1, 2008
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Kocevje , Slovenia, Europe
Re: High efficient 5A/9A Buck Converter

Work of Art ...... Respect!!

How you done with heat manegment ?....max temp?

Some potting in the Al or Cu capsule will maybe reduce temp.

You use PWM I think or current walley on uC ?

Regards!
 

Mdemon

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Oct 1, 2007
Messages
33
Re: High efficient 5A/9A Buck Converter

Hi, I'm interested in driving SST-90s with this and I'm using a 10x10Ah 1.2v D cell NiMH battery pack. As I don't want to fry the battery pack (nor the SST-90s), what configuration would you recommend as being "safe" please?

Can I drive three or four SST-90s at the same time or just one? What would be best with your driver please? (I'd go 5A or 9A on your recommendation)

Sorry for the Noob question but I don't want a :poof: moment! :oops:
 

irv_usc

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Orange County, CA
Re: High efficient 5A/9A Buck Converter

Hi, I'm interested in driving SST-90s with this and I'm using a 10x10Ah 1.2v D cell NiMH battery pack. As I don't want to fry the battery pack (nor the SST-90s), what configuration would you recommend as being "safe" please?

Can I drive three or four SST-90s at the same time or just one? What would be best with your driver please? (I'd go 5A or 9A on your recommendation)

Sorry for the Noob question but I don't want a :poof: moment! :oops:

that's an easy one. you would wire the LEDs in series. as long as your battery pack is more than 2V higher than the Vf total of your LEDs it will run at 5A or 9A. For simplicity if your LEDs were 3.5V each, you could only run AT MOST 3 LEDs with your battery pack, assuming the cells in your pack are in series for 12V.
 

Mdemon

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Oct 1, 2007
Messages
33
Re: High efficient 5A/9A Buck Converter

Thank you. Is it as simple as that? 3 x 3.5 = 10.5v + whatever else is needed. That would mean that the thing would be out of regulation pretty quick wouldn't it? How long would that be?

Would 2 x SST-90s mean I could use around half of the battery power "within regulation"? Math not my strong point... :whistle:
 

Der Wichtel

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Mar 12, 2007
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Germany
Re: High efficient 5A/9A Buck Converter

Yes, it will be out of regulation very fast and the output will get lower.
Furthermore there are voltage drops at the switch and the cables.

With 12V I wouldn't use more than 2x SST-90. But with one or two more NiMh batteries you can think of powering up 3 LEDs. However keep in mind that your batteries must be able to handle the current
 
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