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TIDA-00365: Can this be used for my application?

Santosh Bhaskaran
Prodigy 40 points
Part Number: TIDA-00365
Other Parts Discussed in Thread: CONTROLSUITE, CSD19534Q5A, LM5109B

Can this be used to amplify 12 V PWM signals to 75 V PWM signals?

This is the PWM microcontroller board (https://robokits.co.in/control-boards/rhino-robot-control-board/rhino-robot-control-board-l293-avr-based-with-quick-c-compiler?zenid=2a91hj6ft8d6hhkm3ggun0q3f0)  and its power supply (robokits.co.in/.../modified-computer-smps-for-12v-25a-5v-20a-and-3.3v-15a-output am using.  

I will be controlling brightness of 3 LEDs each having rating of 72 V and 2 A.

  • 0
    TI__Expert 3580 points
    Dear Santosh,

    Thank you for your interest in TIDA-00365.

    The TIDA-00365 PWM inputs are 3.3V CMOS, see specification in the TIDA-00365 design guide chapter 1.2 If you have 12V PWMs, as you write, you'll need to level shift to 3.3V in order to use TIDA-00365.

    For the MCU I'd I would rather suggest using C2000 MCU to do the control. An example of an LED brightness control with a C2000 MCU can be found here: www.ti.com/.../TMDSDCDCLEDKIT. It supports 12-48V DC input to SEPIC DC/DC stage 50V DC output. I am aware is less than you'd need.

    When you however use a C2000 MCU (e.g. InstaSPIN-MOTION enabled C2000 Piccolo LaunchPad C2000: www.ti.com/.../launchxl-f28069m) you can directly connect the PWMs and ADC to TIDA-00365 as we have done too, see TI design guide chapter 4.1. For C2000 software support, please refer to the C2000 controlSUITE: www.ti.com/.../controlsuite.

    Regards,
    Martin
  • 0 in reply to Martin Staebler
    Prodigy 40 points
    My LED starts glowing at 55 V only. So this cannot be of use to me.
  • 0 in reply to Santosh Bhaskaran
    TI__Expert 3580 points
    Dear Santosh,

    Your initial question was if TIDA-00365 can be used for to convert 12V PWM to 75V. Your last answer was that you need a minimum 55V, and TIDA-00365 supports 75V, hence meet that. As I wrote in my first answer, the limitation is that the TIDA-00365 PWM inputs provide 3.3V and you need an additional level shifter.

    If this approach (level shifter) doesn't work for you, then TIDA-00365 will unfortunately not be a solution to you. In that case the conclusion to your questions is: TIDA-00365 cannot be used for your application.

    Therefore I consider this case resolved/closed.

    Regards,
    Martin
  • 0 in reply to Martin Staebler
    Prodigy 40 points
    Any other IC that can resolve it?
  • 0 in reply to Santosh Bhaskaran
    TI__Expert 3580 points
    Santosh,

    If you don't like the level shifter you may choose a different gate driver like the LM5109B (half-bridge gate driver, so you need two for a full-bridge), where VDD is up to 14V. The power MOSFET would remain CSD19534Q5A.

    However please ensure the switching threshold of your 12V PWM signal is compatible to the 3.3V TTL input level thresholds per LM5109B data sheet.

    Regards,
    Martin