Reflow oven profiles

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We have 30 LED PCBs. Only differences between them are size ... - Nov 23, 2023 by klauss

Perform profiling with a product where the LED is placed mor... - Nov 23, 2023 by Marks

It is about thermal mass and heat dissipation. If you want t... - Nov 27, 2023 by Evtimov

All depends on how accuracy you require -- Incase if the PCB... - Nov 30, 2023 by jinesh

We have a customer that at one point had a dozen LED boards ... - Nov 30, 2023 by ProcEng1

Which profile type is used, RTS or RSS? ... - Nov 30, 2023 by Marks

RTP ... - Nov 30, 2023 by ProcEng1

Ramp to spike. The same as (ramp to peake) ... - Nov 30, 2023 by Marks

klauss

#90248

Reflow oven profiles | 23 November, 2023

We have 30 LED PCBs. Only differences between them are size and led counts. there's about 10cm (3.9inches) between smallest and largest board. and leds start from 60 to 80 pcs. and all leds are the same

My question is that, do i have to set 30 different oven profiles up to their size anyway? if so is it mentioned in any article or IPC standarts?

or is it enough to set one profile for all of them.

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Marks

#90251

Reflow oven profiles | 23 November, 2023

Perform profiling with a product where the LED is placed more than on another products. You get a valuable case with a higher delta T and possible maximum reflow temperature must use, etc. This profile will be used for similar products. You need to optimize a profile that represents typical SAC 305 limits, thermal mass and warpage factors + the LED reflow cycle specification.

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Evtimov

#90268

Reflow oven profiles | 27 November, 2023

It is about thermal mass and heat dissipation. If you want to be accurate, you should profile each one. If you want to be efficient, You should design all panels to come to the same size. This way variation from panel to panel will be minimal (given same PCB thickness) and you can run them all under same profile

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jinesh

#90288

Reflow oven profiles | 30 November, 2023

All depends on how accuracy you require -- Incase if the PCB layers are same along with same solder paste uses -- pls segregate as batch in terms of similar pcb dimension ( within 30cm variation) attach thermo couples to maximum area -- May be you need to capture 5 or 10 different types of profiles maximum..!!!

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ProcEng1

#90291

Reflow oven profiles | 30 November, 2023

We have a customer that at one point had a dozen LED boards that were all very similar in size. They used Aluminum boards and I found that the difference in thermal mass between the assemblies was negligible considering the largest difference was actual LED count, and their mass was such a small percentage of the total. So I created a Recipe that covered almost all of the assemblies under 16". I do run my ovens at the slowest belt speed that puts the product in the reflow for close to the maximum for paste life. That way it's one less variable.

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Marks

#90292

Reflow oven profiles | 30 November, 2023

Which profile type is used, RTS or RSS?

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ProcEng1

#90293

Reflow oven profiles | 30 November, 2023

RTP

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Marks