dpa 424 design

Posted by: utkanth on 09/06/2020

I am using dc dc converter using DPA switch DPA424.. my input voltages are 24v and output is 5 v 0.2 amp= 1 w.
I am using this approx monthly 200 nos. I experienced the random failure of DPA switch or clamp diode ( may be two or three cases per month).
what can be the reason? If i want to evaluate my design then how to do it? ( which waveform should I monitor?)

Comments

Hello utkanth,

Thank you for interested in using Power Integrations products.

Before we can provide more support, Could you please provide more details about your design, like the power level, application field, schematics?

we could dig in more with those information.

Best Regards

Here is the schematic used for my powersupply.

Attachment	Size
DPA_sch.pdf (2.27 MB)	2.27 MB

Hello utkanth,

when you mention the failure of clamp diode, do you mean the 1N4937? Any other components you have experienced similar failure?

Best Regards

I mean by p6ke43a.

but i am worried more for dpa switch failure.

I think increasing capacitance parallel to P6KE43A may help.

Hello utkanth,

After the P6KE43A got damaged, the DPA switch will get damaged as well because we do not have any clamp circuit here. the leakage spike might easily damage DPA switch.
I think the issue here is P6KE43A could not clamp the leakage energy. can you change it to P6KE100A and see if it helps

Best Regards