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UCC5304: Recommended Operating Conditions

Ray Vincent Aranzaso
Genius 16780 points
Part Number: UCC5304

Hi,

Good Day.

I am trying to build a power converter, using GaN Hemts.

Therefore, I chose your isolated gate driver UCC5304 as it is one of the few isolated gate drivers dedicated to high-voltage GaN technology out there (I am using 1200V GaNs).

Now, the data sheet says that the supplied isolated voltage (VCC) can be anywhere from -0.5 to 20V but the recommended operating area is 6...18V.

My GaN Hemts do not accept a voltage greater than 7.5V. Thus, my VCC probably should be between 6 and 7.5V, even though that is already a pretty narrow span, considering that 7.5V is the absolute maximum rating of my transistor.

My question is, why the datasheet recommends a voltage of 6...18V, and what bad could happen if I operate the driver with only 5V. Because I want to use an integrated circuit as the power supply for VCC and most manufacturers offer ICs that generate 5V and not 6V.

Since most GaNs need a lower gate-source voltage than MOSFETs, I am actually surprised that the recommended operating region for VCC is 6...18V for this GaN-Hemt driver.

Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Expert 3760 points

    Hi,

    That 6-18V specification is for the output bias supply (VDD) not the gate driver supply (VCC) which has a range of 3-5.5 V. As for the bias supply, other types of FETs can be rated that high. The gate of the transistor(s) at the output(s) will swing from VSS to VDD, so if you have the gate voltage greater than 6V that will work just fine with the gate driver. Just ensure that you power the gate driver with VCC=3V up to 5.5V. If you have VDD<6V the driver will not operate properly since there is an undervoltage lock-out functionality that disables the output if the supply voltages (VCC or VDD) are not high enough. The gate driver will not output anything. 

    Best,

    Nancy