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Same remark as Easy Peasy, 60 - 65°C is not bad at all, it's a great improvement since your first post. I still recommend you to calculate the theorical power dissipation in your MOSFETs, and then compare the result with the temperature you are measuring.
The evaluation board for this IC...
My advice would be to calculate the power losses with each MOSFET, and compare the result. Use an excel sheet with each MOSFET parameters, so you can easily add new mosfets.
For the power losses in your MOSFET, you can use this document: https://www.ti.com/lit/an/slyt664/slyt664.pdf
You can...
Ben,
Here is the part of the datasheet allowing you to calculate the power dissipation of the chip:
With the last mosfet you used:
Pd = 24V(9mA + 615k(37nC +25nC)) = 1.13W
1.13W * 38°C/W = 43°C temp increase on the LTC4011, but if it has troubles driving the fets, it also increases the...
Hi, I have worked on several LT ICs, and to me the problem you are encountering may be related, as Easy peasy already told, to the switching specs of your si7145dp MOSFET. Qg on this fet is 150nC at 5V approx, the previous fet you were using (FDD6637) had a Qg of 25nC.
On the LTC4011 datasheet...
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