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DRIVER MOSFET for HIGH-POWER MOTOR CONTROL

Davide Bellini
Prodigy 80 points
Other Parts Discussed in Thread: UCC27282, UCC27288, UCC27712

Hi Team,

I'm designin a DC Brushed Motor Control High-Power:

Power Supply: 12-24V , I mot: 50A

PWM control with frequency:4KHz

I would like to know if you can suggest a driver Mosfet in Half-Bridge configuration to control the DC Motor withy Pwm.

The Motor is unidrectional and the Motor (Load) is in configuation High-Side with Mosfet Freewheling in parallel and Mosfet PWM Switch toward Ground.

As the current is very high, I need to parallelized the Mosfet: 2xFrewheeling + 2x PWM Switch.

The driver is vey important to optimize the thermal dissipation in Conduction and in Switching (also if the frequency is low).

Furthemore the slew-rate must be contained in order not to stress the mosfets too much.

For greater completeness the chosen Mosfets have these characteristics:

Qg:78.6nC, Qgd:12.2nC. The rise time 100ns should be a good starting point.

Can you suggest a driver that has the strength to drive these Mosfets?

Please, let me Know.Thanks.


  • 0
    TI__Mastermind 21685 points

    Hello Davide,

    With the gate charge you mention of 2 x 78.6nC and a target of 100ns Vgs rise and fall times, the driver current required is ~1.8A.

    The input voltage of up to 24V will be compatible with the TI 100V drivers, a good candidate is the UCC27282 which has input interlock, 3A gate drive current and voltage ratings support up to 100V inputs. Another consideration is a similar driver, the UCC27288 which has an external boot diode, this may be a good idea since there will likely be a larger value bootstrap capacitor required due to the high gate charge and low frequency operation.

    Other drivers commonly used in motor drive is the UCC27712 which has 1.8A/2.8A gate drive, input interlock and fixed dead time of 150ns. This devices is rated up to 600V high voltage input, but these type drivers are commonly used in motor drive due to their cost efficiency.

    Regards,

  • 0 in reply to Richard Herring
    Prodigy 80 points

    Hello Richard, really thanks.

    Ok UCC27288 for my application so I can design the boot diode. 

    About DC BULK Capacitor (or called also DC-Link Capacitor), could you tell me if you have a guidelines or application notes to properly size this capacitor given the high-current? In the layout it will be placed very close to the Mofsets in the shortest possible loop to reduce the inductance of the loop.

    It is the most important component of the control besides the driver and the Mosfets.

    Please,let me Know.Thanks.

     

  • +1 in reply to Davide Bellini
    TI__Mastermind 21685 points

    Hello Davide,

    I concentrate on the gate driver aspects of power system designs Vs total system solutions. However I would expect the requirements would be similar to power systems with respect that you would size the bulk capacitors based on the peak currents, duration of peak currents and the acceptable voltage ripple. 

    The capacitor RMS current ratings are also a consideration.

    Below is a link to an app note on a motor drive reference design that is hopefully useful for your question.

    http://www.ti.com/lit/ug/tiduay9/tiduay9.pdf

    Regards,