• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 3 answers
  • Subscribers 63 subscribers
  • Views 149 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.

LMG5200: schematic confirm

Tommy Tzeng
Genius 5865 points
Part Number: LMG5200
Other Parts Discussed in Thread: TPS61322, INA281

Tool/software:

Hi Team,

may we ask you to review this schematic to see if there any issue? thanks for you help and learn from you.

LMG5200.pdf

  • 0
    TI__Intellectual 1560 points

    Hi Tommy,

    Thanks for sharing the schematic. I'll take a look and get back to you with the feedback.

    Thanks,

    Subhransu

  • +1 in reply to Subhransu Satpathy
    TI__Intellectual 1560 points

    Hi Tommy,

    Please see my comments below:

    Refer to following image:

    • Consider 1uF and 2.2uF caps for the VCC
    • Separate AGND and PGND for better signal integrity.
    • Please refer to the EVM sch and layout Altium files for further reference on this:

    https://www.ti.com/tool/LMG5200EVM-02#design-files

    Thanks,

    Subhransu

  • 0 in reply to Subhransu Satpathy
    Genius 5865 points

    Hi Subhransu,

    got it , thank for your great support.

  • 0 in reply to Subhransu Satpathy
    Genius 5865 points

    Hi Subhransu,

    we would like to confrim the issue of using LMG5200 to form a full bridge(H-bridge)

    1. In the design, is it sufficient to ensure symmetry on both sides?

    2. In the attached circuit, is it feasible to use two sets of PWM signals to control the upper and lower bridges of two LMG5200 modules?

    3.  is there anything else we should be aware of?

    thanks for your support. and learn from you.

  • 0 in reply to Subhransu Satpathy
    Prodigy 10 points

    Hi, i am  James,
    I am using the LMG5200 for an RF heater application with a frequency below 5MHz.
    I plan to use two LMG5200 devices to form an H-bridge, controlled by two sets of
    synchronized symmetrical PWM signals with dead time generation to drive the high and low sides.

    Questions:LMG5200_H_BRIDGE_SCH.pdf

    PWM1 is connected to the high side of U8 and the low side of U9. Is it appropriate to use the
    same PWM signal to drive the MOSFET gates of both LMG5200 devices in this way?

    PWM2 is connected to the low side of U8 and the high side of U9.

    The LMG5200 EVM reference board uses a half-bridge configuration. Is it feasible to use it as a full bridge and operate properly at 5MHz frequency?

    Is it appropriate to power the VCC pins of both LMG5200 devices using a TPS61322 regulator?

    Is it suitable to use an INA281 for current sensing on the low side of the H-bridge in this design?

  • 0 in reply to Tommy Tzeng
    TI__Intellectual 1560 points

    There's no issue with uses 2 units of LMG5200 for a full-bridge. You can use 2 sets of signals.

  • 0 in reply to James Chang
    TI__Intellectual 1560 points

    Yes, you can have a common signal for driving High side of one device and low side of another. 

    As long as the Voltage regulator ensures the recommended voltage level req at the VCC, there's no issue here.

    The gate driver of the device is capable of driving it at 5MHz. The switching losses for the target application circuit and thermal design will be deciding factor for ensuring operation at high switching frequency.

    You can use INA281 current sense amplifier here.