We confirm that the is functionally the same as the FPS1000-48 except for the differences in the packaging of these two power supplies. We have other 1000W, 48V output power supplies, but if the FPS or RFE series work for your application, it may be best to stay with them.
Since you are located in Slovakia, you are welcome to visit our European web site at: http://www.lambda-gb.com/public/index.aspx if you want to explore other 1000W power supplies.
Thanks for your quick reply.
Since I'm redesigning the whole unit I'm free to completely change the power supplies. So if you have a suggestion for a more suitable power supply series (i.e. cheaper ) I'd be glad to hear about it.
Currently our production version uses two FPS modules mounted in our custom 2U 19" rack enclosure (with some additional cooling). So there is plenty of space available in the box. The FPS series performed well for our purpose so far. The only annoyance is the loudness of the cooling fans even without load (not to mention full load - first time I've applied full load I thought its preparing to take off and fly home to your factory ).
Hi Again Miki,
You may want to look at TDK-Lambda's model power supplies. These are not rack mountable, but may be of interest since they have low acoustical noise. For specs and details please go to this web site: http://www.lambda-gb.com/public/product_details.aspx?cid=1&t1type=acdc&scid=281
For price and availability, here is an e-mail address you can use:
Any of the companies you mention above are good sources. I ran across a novel LED driver circuit that does not use electrolytic caps (which dry out over time). You can review this design at the following web link:
Also, you might consider a ready-made power supply since they come with Safety Certs that you must have when operating off the AC line.
Some suggested models are listed at this site: http://us.tdk-lambda.com/lp/products/ledsigns.htm .
Good luck with your project.
Linkswitch 613.... I would just like to purchase a ready made ac-dc converter modual; universal mains in and 5V 1W out worst. Do these exist in a small outline (vis. the off the shelf modual that works at 72Vdc in)? I can just shoehorn in a setup using the linkswitch 613 which is more powerful than I need.
The 613 worked, but I had to play with that clamping /damping cct. to get a proper result at each end of the mains-in spread. I'm using the recommended cct.... why do these never quite work?
What might I have over-looked?
I don't have experience with the Linkswitch 613. But if you Google "AC-DC 5V 1W power supply" you will see some possible alternates. Most commercial AC-DC power supplies begin at 5W of output power. I know this is more power than you need, but it may be a more reliable solution for you. You may want to review a 5V, 5W power supply (model KPSA5-5) at this website: http://us.tdk-lambda.com/lp/products/kpsa-series.htm
Best regards, Mel
Many thanks Mel,
It would do me good to get my head around those clamping/ damping ccts. though. E.G it says use a 820pF cap rated 1KV, but they are not that well stocked so I've used a 1n 1KV version.... should I adjust the TC of its parallel resistor for the same value? i.e. how critical is this cap value?
Have you tried getting pulse rated capacitors just lately.... they are becoming made-to-order!?
You should be able to get assistence with your LinkSwitch questions at this website:
Yes, capacitors of all types have become scarce, due in part to the Japanese earthquake and tsunami.
Hopefully, this situation will clear up soon.
I'm using an charge pump to provide power to an op amp in an audio EQ. The problem is the operates at 10khz and provides a whine onto Vee. My question is ; if I use a low pass filter to cut out the 10khz what would be the ideal choice of components to remove the hum and try to maintain some sort of efficiency. Ideally squeezing out as much power as I can. I was thinking around R=47ohm (to limit Volt drop) and changing Cr to around 33uf and putting the same filter on the V supply to the charge pump giving good roll off but I don't know what effect this will have on the device ? Any ideas?
We have found that audible noise in power circuits can originate from inductors or transfomers that have too much mechanical clearance between the cores and the windings. You might try substituting these parts in your circuit with others from different vendors to see if the noise is removed. This is the only suggestion I can offer.
Please can you help me choose a suitable switching regulator? I need to step a DC42V lithium ion battery current down to 4.2V to drive a GSM modem. Most of the time the GSM modem only uses about 2mA of power but it occasionally bursts up to 2A for short 4ms periods during transmission. I need the conversion to be as efficient as possible so as not to flatten the lithium ion battery. I tried an Allegro A8499 but it kept cutting out when the 2A transission bursts happened. Do you know any switching regulators that are suitable for this kind of conversion.
Thankyou and best regards,
Hi Mel Berman!
I am working with an EL wire. I have set-up a circuit similar to that of Jeri Elsworth EL WIRE POWER SUPPLIES. (link http://www.youtube.com/watch?v=AcXHx5ikjM4) It works great. Now I am looking online to purchase a trasnformer for this circuit so that i can make a friend one too. I can't seem to find any small transfromers. The one I am using currently from salavged parts measuring 14mm X 14mm X 16mm and was PCB mounted. Also I know that this trasnformer has a single coils on each side with one being centered tapped. Originally the circuit I pulled the transfromer from was battery operated with an input of 3VDC and step-up to 115VAC. (where the EL wire used to go)
Since I wasn't satisfied with it's brigness level on the original circuit. I used Jeri's circuit to provide the system with 5VDC and stepped up to 140VAC for the EL wire. I have also set up the time constant so taht the resistor is variable with the Capacito making the frequency adjustable. Now the big question is, what sort of power transfromer would you recomend for this project.
Thanks in Adavanced,
Mel Berman has over 13 years experience in the power supply industry and has authored and published many articles about AC-DC Power Supplies, DC-DC Converters and EMI Filters. He's waiting for your questions.
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