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UCC27322-Q1: frequency and Iq current

Sherry Liang
Genius 10255 points
Part Number: UCC27322-Q1

Dear team,

1. In my understanding, the test condition of IDD for UCC27322-Q1 should be ENABLE=low, right? If not, what is the current when IN=LOW & ENBL=LOW?

2. What is the PWM frequency range we support for input/output?

Thanks & Best Regards,

Sherry

  • +1
    TI__Genius 16825 points

    Hi Sherry,

    Thank you for reaching out on E2E!

    The test conditions on the datasheet seem to be missing extra rows for the test conditions. I have attached to table below with the proper test conditions below. 

    When IN = Low and EN = Low, the Idd is 150 uA typical, and 225 uA max.

    2. We do not specify the maximum frequency range for our devices as it is variable depending on many different factors. 

    The maximum frequency that the device can operate at is based on the maximum power dissipation of the device with respect to the ambient temperature. Below I will link a maximum frequency calculator that can be used to calculate the maximum frequency that a device can operate at based on its datasheet as well as the FET's, along with the ambient temperature that the device will be operating in. It works with both Half-bridge and low-side drivers.

    Maximum operating frequency calculator: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1025075/faq-ucc27282-how-to-calculate-the-max-operating-frequency-of-a-gate-driver  

    Another way to calculate if a device can handle a certain frequency is by using the power dissipation formula. The formula I will use is referenced from section 12.4 of the UCC27322-Q1 datasheet.

    Based on Junction-to-Ambient Thermal Resistance, we can calculate the thermal increase in the device by multiplying it with the the calculated power dissipation P. I have attached the table below corresponding to UCC27322-Q1 and its Junction-to-Ambient Thermal Resistance RΘJA. The value will change based on the package being used.

    We can take this temperature we calculate above and add it to the ambient room temperature the device is operating in to get our Tj.

    If the calculated Tj is within the maximum Tj of 150C (Maximum junction temperature of the device), The device can operate at that given frequency. Please note that exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

    I hope this helps!

    Thank you,

    Kevin