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TIDM-1007: Migration between F28004x and F2807x/37x

Wayne Huang
Genius 17125 points

Part Number: TIDM-1007
Other Parts Discussed in Thread: POWERSUITE

Dear Champs,

I have some questions about TIDM-1007 and need your clarification.

1) The switching rate of PWM is 100 KHz. As GaN is usually used with higher PWM switching frequency, why the PWM switching rate is only designed at 100 KHz in this design? If 500 KHz is considered, Is there any concern?

2) What is the computational power and memory requirement in this design based on the spec now? What is the ISR frequency here (same as 100 KHz-PWM)?

3) For higher PWM switching freqeuency, if F2837x/F2807x is used, can F28004x codes be easily migrated onto F2837x/F2807x by simply changing the underlying driver library/API? If not, what else should be considered?

(Not sure if this code is based on bit-field-based styles or driverlib/API-based?)

4) In Sec 3.1.2.1,

It says CCS 7.4 or above is suggested, but the current CCS download is only 7.3.

Was this design used with CCS 7.4?

Is there any concern here?

Thank you in advance.

Wayne Huang

  • 0
    TI__Mastermind 43730 points

    Wayne,

    1) The switching rate of PWM is 100 KHz. As GaN is usually used with higher PWM switching frequency, why the PWM switching rate is only designed at 100 KHz in this design? If 500 KHz is considered, Is there any concern?

    The CCM topology is a hard switched topology, so if the switching frequency is higher the losses will be higher thus affecting the efficiency. The switching frequency was chosen with efficiency in mind.

    3) For higher PWM switching frequency, if F2837x/F2807x is used, can F28004x codes be easily migrated onto F2837x/F2807x by simply changing the underlying driver library/API? If not, what else should be considered?

    (Not sure if this code is based on bit-field-based styles or driverlib/API-based?)

    The code is based on driverlib and is easily portable to F2807x device. Except for CMPSS and PWM synching, where there are slight changes between the devices, the code should port as-is. Please note all the device-specific instructions are in board.c /h file and all the settings are in the user section of the settings.h file, hence moving to a different device does not require much effort. We engineered this solution to specifically address these concerns. 

    4) In Sec 3.1.2.1,



    It says CCS 7.4 or above is suggested, but the current CCS download is only 7.3.



    Was this design used with CCS 7.4?

    At the time of writing of document CCS7.4 was scheduled to release in Nov, it fixes a minor bug in CCS that was preventing powerSUITE from displaying correctly on machine where Japenese or Korean language was selected as the default install for windows. This will be fixed in CCSv7.4

    Other than that CCSv7.3 should work ok. Also we had a bug fix in CCS7.4 for powerSUITE page hanging .. 

    i'll check with CCS team on time horizon for CCSv7.4 release

    regards

    Manish Bhardwaj  

  • 0 in reply to Manish Bhardwaj
    TI__Genius 17125 points

    Manish,

    I see.

    Thank you for your information.

    Wayne