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TPS28225: The TPS28225 is a good option good for 200kHz PWM applications?

Martin Holguin
Intellectual 270 points
Part Number: TPS28225
Other Parts Discussed in Thread: LM2105, UCC27211A

Hello everyone,

I'm designing a Peltier cell controller circuit, and I'll be using a full H-bridge for this purpose. I will control the gate signals of the MOSFETs with a 200kHz PWM signal. I already have the power circuitry implemented, as shown in the image. For controlling the MOSFET gates, I want to use two TPS28225TDRBRQ1 gate drivers. Will this gate driver be suitable for my application? In the datasheet, I see that the maximum frequency is 2MHz, and it can supply up to 4A of current. However, looking at the electrical characteristics tables, it indicates that it can only supply 2A with VUGATE-PHASE = 2.5V and 4A with VLGATE = 2.5V. Oh, I almost forgot, I was planning to use VDD = 7V, although I would prefer to use a gate driver that can support 12V to control the MOSFET gate.

Regards,

Wálter Paz.

  • 0
    TI__Guru**** 189399 points

    Hi, Wálter Paz,

    What attracted you to this device? It is quite old, and we have newer, better parts.

    You can optimize your efficiency by switching at a lower frequency. I would imagine the thermal time constant of the peltier is << 200 kHz. I assume you have considered that and have another reason for wanting to switch at 200 kHz.

    Best regards,

    Don

  • 0 in reply to Don Dapkus
    Intellectual 270 points

    Hi ,

    I thought it would be a good option for several reasons, but mainly because of its low cost and few components required for its operation. Could you recommend me a better MOSFET gate driver? I'm using a frequency of 200 kHz because I will be converting the PWM output signal from the H-bridge to DC using a differential LC filter, I forgot to place the power circuit, here it is:

    _

    Regards,

    Walter

  • +1 in reply to Martin Holguin
    TI__Intellectual 2100 points

    Hi Walter,

    Thank you for reaching out! Can you confirm the bus voltage of this application?

    The team has a calculator tool that can help determine the minimum current required for you application: Link to post. After you have input your circuit parameters to determine what current is needed, you will be able to select a suitable Half-Bridge driver. LM2105 is a new, 0.5A/0.8A driver that could be a good fit for this application, or our UCC27211A device offers 4A/4A peak drive current if the higher current is required.

    Let me know if you have any confusion using the calculator tool, or if you are still unsure of which device will be best for your application.

    Best,

    Alex Weaver

  • 0 in reply to Alex Weaver
    Intellectual 270 points

    Hello ,

    I've decided to use the UCC27211A in my design, and since the VBUS is rated at 24V, there shouldn't be any problem. The microcontroller I'll be using operates with CMOS logic levels, 0 - 3.3V. Will this cause any issues with controlling the PWM signal, right? I noticed that the high-level voltage is at least 1.9V and the low-level voltage is at most 1.9V

  • 0 in reply to Martin Holguin
    TI__Intellectual 2100 points

    Hi Walter,

    I'm happy to hear you decided on UCC27211A! I do not anticipate any issues with controlling the PWM. As you noted, the low-level voltage max threshold is 1.9V, and the high-level voltage threshold max is 2.7V for UCC27211A. If your controller is able to send 3V input signals, this should be sufficient for the driver's switching.

    Best,

    Alex Weaver

  • 0 in reply to Alex Weaver
    Intellectual 270 points

    Hi

    Thanks for the recommendations, then I will continue my design with the selected device, thank you very much.

    Regards.

  • 0 in reply to Martin Holguin
    TI__Intellectual 2100 points

    Hi Martin,

    No problem. Please feel free to post any additional questions as you continue through the design process!

    Best,

    Alex Weaver