Passive cooling in industrial temperature range
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Tagged: heat sink, passive cooling, thermal
- This topic has 1 reply, 2 voices, and was last updated 4 years, 4 months ago by
Neeraj Dantu.
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- July 17, 2020 at 7:49 am #10373
Hello,
I trying to design the best cooling solution for OSD32MP157C but I can’t find TDP of SiP in datasheet. I want to drive internal PMIC up to 2A output current. PCB (109x67mm) is 6 layers with two GND (35um) and one VDD (35um) power plane. I’m not sure if the PCB will absorb enough heat for proper operation in the industrial temperature range up to 85 °C.
Do I have to use a heat sink? Please, what is the most suitable passive cooler for my solution?
Thanks
Samuel - July 22, 2020 at 10:22 am #10382
Samuel,
Please take a look at the Thermal Application note for OSD32MP1 here: https://octavosystems.com/app_notes/osd32mp15x-thermal-guide/
It could help you estimate the case temperature for current dissipation and allow you to decide on your thermal options. Because the PMIC has several rails that are both DC/DC converters and LDOs, there could be variation in terms of heat generation. We recommend you prototype the power draw with a development board and make measurements for temperature to see if the device stays in specification range. Doing this will also allow you to evaluate your heat dissipation options and whether you will need a heat sink.
Best,
Neeraj
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