Non-isolated 230 VAC to 5 V DC supply

Posted by: tomlindema on 10/18/2013

Dear Sir

I have seen your EP48 of May 2nd 2005, and I like this idea. Now, a couple of questions.

1. Is LNK30x series still good for new designs or should I look at something else

for a similar approach as described in EP48?

2. Is the board described in EP48 commercially available, for testing and tweaking

(I would like to trim the output voltage lower)?

3. Is there a way to increase the output current to 200 mA average, but 2 A peak?

Actually, I need only 230 VAC +/- 15% as input, no wide input requirement.

Thank you very much for any help.

Tom

Comments

1. LNK30X is good f or new design.

2.PLS cintact with your local FAE for the board

3. For 2A peak question, could you let me know your application? 200mA is no problem, but 2A peak is too much.

Thanks PI-cochrane

1. OK, understood

2. Please give me the nearest FAE contact details

so that I can buy this EVK

3. Please note: it is very short bursts of 2A, at 577 us length and

duty cycle 1:8. The average output current always remains under

200 mA so that value can be used for thermal calculations.

But otherwise, can I calculate a coil acpable of supplying 2 A

for the short period?

For the FAE information, PLS open the following lnk and give a call to them. But it should be noted that not all the sales office have FAE, but they should tell you how to contact. http://www.powerint.com/en/company/sales-information/worldwide-sales-support-locations.

Actually, 577uS or 577/8us is long time for switching mode power supply, but it is hard to say yes or no unless we try. PLS order or build a board and then test it.

regards

I am now considering to bridge the beforementioned pulsed output requirement with a supercap, or other bulky capacitor.

But with the LNK30x series, how much output current (average) at 5 V could I expect to get from 230 VAC, in a similar setup as described in EP48?

What is the best way to simulate such a non-isolated circuit, with say LNK306? Please, which program? And are there pre-made circuit models available, to just tweak component values?

Hi,

Datasheet claims that LNK306 can handle 220mA load for 230Vac even at DCM operation.

PI does not have simulation model at all. Honestly, I am not good at simulation, but I really think almost all the simulation tool works for you. As you know, the simulation model of the LNK306 is most important for the simulation.

Sorry for not help you a lot!

Regards