• State TI Thinks Resolved
  • Locked Locked
  • Replies 6 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 634 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

9A High-Speed MOSFET Drivers

Ajesh P
Prodigy 30 points

000001445454

9A High-Speed MOSFET Drivers

Features:
• High Peak Output Current: 9A
• Wide Input Supply Voltage Operating Range:
- 4.5V to 18V
• High Continuous Output Current: 2A Maximum
• Fast Rise and Fall Times:
- 30 ns with 4,700 pF Load
- 180 ns with 47,000 pF Load
• Short Propagation Delays: 30 ns (Typical)
• Low Supply Current:
- With Logic ‘1’ Input – 200 µA (Typical)
- With Logic ‘0’ Input – 55 µA (Typical)
• Low Output Impedance: 1.4 (Typical)
• Latch-Up Protected: Will Withstand 1.5A Output
Reverse Current
• Input Will Withstand Negative Inputs up to 5V

please help me how can I calculate the switching frequency of the Ic by using the above-mentioned parameter, please help me

regards

ajeesh t k

ajesh@henix.in

  • 0
    TI__Genius 13445 points

    Hello Ajeesh, 

    Thanks for your interest in our drivers, my name is Mamadou Diallo, from the High Power Drivers' team.

    In order to accurately provide comments on switching frequency, can you please elaborate on which one of our driver you are using or plan on using? What application is this for? I ask this because depending on the driver and the FETs (GaN, MOSFET, IGBT, SiC) you are switching, you will see different operating frequencies. GaN FET drivers for example can operate up to several MHz switching frequency while some MOSFETs drivers typically up ~500 to 800kHz before you start to reach the power dissipation limits of the driver (depending on supply and load).

    I discuss operating frequency and the parameters that influence it from a gate driver perspective on the link below.

    https://e2e.ti.com/support/power-management/f/196/p/788867/2917563#2917563

    Regards,

    -Mamadou

  • 0 in reply to Mamadou Diallo
    Prodigy 30 points
    Sir,
     
    I don't know the serial number for that product. 
    I doubt how to calculate the switching frequency of MOSFET driver ic I think if you can help me. and I mention below on all parameters for the driver ic.
     
    9A High-Speed MOSFET Drivers
    Features: 
    • High Peak Output Current: 9A • Wide Input Supply Voltage Operating Range: - 4.5V to 18V • High Continuous Output Current: 2A Maximum • Fast Rise and Fall Times: - 30 ns with 4,700 pF Load - 180 ns with 47,000 pF Load • Short Propagation Delays: 30 ns (Typical) • Low Supply Current: - With Logic ‘1’ Input – 200 µA (Typical) - With Logic ‘0’ Input – 55 µA (Typical) • Low Output Impedance: 1.4 (Typical) • Latch-Up Protected: Will Withstand 1.5A Output Reverse Current • Input Will Withstand Negative Inputs up to 5V • Pin-Compatible with the TC4420/TC4429 6A MOSFET Driver • Space-saving 8-Pin 6x5 DFN-S Package
    if any calculation example or reference link for calculating switching frequency of driver ic ...
    as I eagerly waiting for your replay
    Regards,
     
    Ajeesh 
     
    Research and Development Engineer
     
    Henixsoft
    XIII/ 706,
    New Industrial Development Area,
    Kanjikode,
    Palakkad,
    Kerala-678621
    Mob: 9656960460
  • 0 in reply to Ajesh P
    TI__Genius 13445 points

    Ajeesh, 

    Our driver's are used to drive MOS-gated transistors in specific applications(Switch Mode Power Supplies, Motor Drives, Induction heating, Battery Chargers, etc..) where the power MOSFETs/IGBTs/SiC must be turned on/off at a specific switching frequency to meet the application's needs. Determining your system needs like power losses, efficiency, power levels, etc... are usually first steps before identifying switching frequency of the system to help you meet your goals then choosing a driver capable of operating at identified switching frequency. 

    Having said, you may estimate the operating frequency of a gate driver by working backward from the link I shared with you in my previous post (attached again below). 

    https://e2e.ti.com/support/power-management/f/196/p/788867/2917563#2917563

    Additionally, knowing the gate charge Qg of the FET the IC is driving, and the average gate current you can determine the operating frequency from: Iavg = Qg * Fsw. From which Fsw = Iavg / Qg.

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

    Regards,

    -Mamadou

  • 0 in reply to Mamadou Diallo
    TI__Genius 13445 points

    Hello Ajeesh, 

    I have not heard from you, I will therefore assume this issue is closed and mark this thread as resolved. If so, please press the green button or let us know if you have further questions by further posting on this thread and we will happily help address them.

    Regards,

    -Mamadou

  • 0 in reply to Mamadou Diallo
    Prodigy 30 points

    sir,

    Do we have doubts on how to calculate the swithing frequency of driver ic? if use any parameter to calculate it, please explain that the relation and characteristics also, 
    we also study on that spec sheet but we can not get anything if you know anything about that calculation of switching frequency/ operating frequency of the driver ic please tell us, 
    we are eagerly waiting for your valuable feedback

    --------------------------
     
    Regards,
     
    Ajeesh 
     
    Research and Development Engineer
     

    Henixsoft
    XIII/ 706,
    New Industrial Development Area,
    Kanjikode,
    Palakkad,
    Kerala-678621
    Mob: 9656960460
  • 0 in reply to Ajesh P
    TI__Genius 13445 points

    Ajesh, 

    My apologies, I was probably not very clear in my previous responses.

    Propagation Delays, supply current, latch up protection, peak output current do not have any relation to a gate driver switching frequency. Those parameters will not be useful in determining a gate driver switching frequency. 

    Knowing the average drive current required to turn-on/off the load, you can deduct the switching frequency from the equation: Fsw (Switching frequency) * Qg (total gate charge) = Iavg (average gate current) where Fsw = Iavg / Qg. 

    Additionally, Section 2.7 of the link below discusses another way to determine the gate driver switching frequency.

    http://www.ti.com/lit/ml/slua618a/slua618a.pdf

    I hope this addressed your questions, if not please let us know.

    Regards,

    -Mamadou