LYT5216D-TL shorting (damage) issue 24V 150mA design
Hi,
I have used LYT5216D-TL for 24V, 150mA LED driver non-isolated design. I got reference schematic for this requirement from PI's support team and built a proto types around this.
During testing I am facing issue like LED driver board blown out randomly and in all cases we can see that LYT's Source and Drain get shorts along with current sense resistors. I can regenerate issue if I do board power on/off from mains 3-4 times within a 4-5 second.
Attached is the screen shot of schematic. Any insight is highly appreciated in timely manner.
I am struggling more than a month but no luck to find root cause.
Thanks,
Hitesh
Files
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LED driver design.png | 317.92 KB |
评论
Hi Tarmo,
I am using buck topology. Following is our construction windings. Is there any private channel where I can share the layout file?
Thanks,
Hitesh
Attach is inductor construction winding.
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Construction winding.png | 19.6 KB |
Hi Hitesh,
What's the operating input voltage range? Do you have any waveforms on the LYT5 Drain Source during start-up, normal operation, and fault? You can send your layout to my e-mail
Regards,
Tarmo
Hi Tarmo,
I have shared layout to your email ID. Our operating input voltage range is 95VAC-230VAC.
See attached LYT5 drain source start-up voltage.
Thanks,
Hitesh
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waveform.png | 886.54 KB |
Hi Tarmo,
Any update on this?
Thanks,
Hitesh
Hi Hitesh,
What topology are you currently using? Looking at your schematic, I assume this is buck-boost? (Please correct my if I am wrong)
Please send your transformer construction and your PCB layout.
Thank you.
Regards,
Tarmo