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I followed the recommended design for all of the components on datasheet and try to use this Vout to drive multiple high power LEDs with a N-channel MOSFET before connecting the the cathode to the GND.
Will this configuration turn off the chip ?
The vout I got were always 0.1V or 0.2V.
Thanks Juergen,
The LEDs I selected are LZ1-00G102-0000.
Its thermal pad is electrically neutral, so I connected them to the GND.
The current limiting resistance is 536 ohm, so each path shall use around 2.6 mA.
Will the chip have an issue, while the current draw is very small ?
Or
Will the chip have an issue, while the Vout is open circuit?
Thanks
Thanks Juergen,
I have tested disconnecting all LEDs, but the Vout was still ~0.2 V.
Besides, I also tested a new inductor and a new IC, but all of them gave me the same Vout.
Is there any way to measure whether the IC's heat pad contact the PCB successfully?
I saw someone posted about heating pad issue, hence we had already been cautious to assemble it.
Thanks Juergen,
I am still testing the chip.
Do you think the layout will affect the result?
(I think it will affect the transient response, but it should not affect whether we will get 5 V or not)
I also tried to follow the recommendation on the datasheet for the layout.
Thanks
Hi Sabrina,
After the testing, the new boards did work,
but it's not simple to debug the soldering with the heating pad or slight shift of the pins,
so sometimes we needed to use a new IC, which meant the yield rate probably won't be good in a large scale.
If there is any testing method that can be easier to utilize,
it will be really helpful.
I think from the the schematic perspective, it does what it needs to do.