UCC23513: why don't we specify operating frequency in datasheet?

Hi Howard,

Welcome back to e2e, my name is Mamadou Diallo, I am the AE supporting UCC23513 and will work to address your concerns.

The maximum operating frequency for this driver as well as our other gate drivers is determined based on the temperature within the junction of the driver and power dissipation capability of the driver. I discuss this in detail on the copied thread below:
e2e.ti.com/.../788867

In other words, the driver's dissipate some power on the input and output stage from biasing the internal circuitry and switching a load. This power dissipation must not exceed the 833mW specified in section 6.5 of the datasheet. Using Tj = (Pd * RθJA) + Ta where Pd is the Maximum power dissipation on input and output.

As an example, with a VCC = 15 V, IF= 10mA , 50% duty cycle, square wave, and a 100-nF load, the maximum operating frequency (UNDER THOSE SPECIFIC CONDITIONS) would be limited to Fsw=42kHz to ensure that Pd does not exceed the 833mW specified in the datasheet. The maximum operating frequency might be different under a lighter load condition or lower supply voltage.

As long as Pd = 833mW is not exceed, you can you can operate the driver at any frequency while adjusting the load and supply voltage from P = Vdd * Qg * Fsw or P= [ (Vdd)^2 ] * Cload * Fsw

Please let us know if you have further questions or press the green button if this addressed your questions.

Regards,

-Mamadou