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UCC27212EVM-328: in UCC27212EVM-328, why does UCC27212EVM IC overheat?

YongHyun Cho
Prodigy 20 points
Part Number: UCC27212EVM-328
Other Parts Discussed in Thread: UCC27212

Hi,

I got a UCC27212EVM-328 the other day.

I have changed Nch-FET with IPD5N25S3

and 4.7nF/50V/X7R and 1nF/50V/X7R in parallel on the Cboot.

because I have to operate at 3MHz frequency. This is lower Qg, Ciss, Rise time, Fall time than before.

So, I'm testing it. but UCC27212 IC is so hot. temperature is about 85 °C

VDD 12V, 0.08A

HV 12V, 0.3A

The picture below is HIN , LIN signal and HO, LO signal in UCC27212 IC.

I want to know why UCC27212 IC overheat.

is it possible UCC27212 IC to operate at 3MHz, High Voltage?

  • +1
    TI__Genius 11770 points

    Hello YongHyun,

    3MHz is a very high frequency for these drivers. A really basic estimation for the power dissipated in the driver is P = VDD*Fsw*Qg. With your frequency, it looks like your part is dissipating too much power and overheating. Check out this guide for calculating the max frequency the driver can achieve. I see you already are using a fairly low VDD and a low Qg FET, so it may be hard to reduce those anymore. If you need 3MHz and cannot find a lower Qg FET that allows you to operate, I can help walk you through some other options for your system. 

    thanks,

    Alex M.