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Original question:

DRV8711: DRV8711: 4-channel design – Drivers #1 & #3 no PWM, Driver #4 fault, only #2 working

DRV8711: Clarification on Gate Driver Usage in TIDA-01227 vs BOOST-DRV8711 with DRV8711

Upendra Talluri
Prodigy 40 points
Part Number: DRV8711
Other Parts Discussed in Thread: TIDA-01227, CSD19538Q3A, , LM5107

Tool/software:

Dear TI Technical Support Team,

I am currently working on a 4-channel stepper motor driver design using the DRV8711 IC, where we have selected SQJ952EP-T1_GE3 MOSFETs for the H-bridge stage.

While studying TI reference designs, I observed that the TIDA-01227 High Voltage Stepper Driver Reference Design includes an external LM5107SD/NOPB gate driver for the MOSFETs (CSD19538Q3A), whereas the BOOST-DRV8711 evaluation board drives the MOSFETs directly from the DRV8711 outputs without any external gate driver or level shifter.

I would like to understand the following points for design optimization:

  1. What is the major difference between the BOOST-DRV8711 and TIDA-01227 designs from a gate drive architecture and voltage standpoint?

  2. Why is an external LM5107 gate driver required in the TIDA-01227 design but not in the BOOST-DRV8711?

  3. In my custom design (4-channel DRV8711 board using SQJ952EP-T1_GE3 MOSFETs), do I also need to include an external gate driver to ensure proper MOSFET switching and performance?

I attached my schematic for your reference. Your guidance on this will help ensure that our design follows best practices for reliability and thermal performance.

Thank you for your support.

Best regards,

Upendra Talluri

  • 0
    TI__Expert 6930 points

    Hi Upendra, 

    Thank you for reaching out to us. 

    Upendra Talluri said:
    What is the major difference between the BOOST-DRV8711 and TIDA-01227 designs from a gate drive architecture and voltage standpoint?

    The TIDA-01227 is to demonstrate the use of the DRV8711 stepper motor controller to control stepper motors at voltages higher than 60 V. The DRV8711 operates at 12 V while using additional circuitry to convert to high voltage control signals, however the BOOST-DRV8711 is 8-52V, 4.5A, bipolar stepper motor drive stage based on the DRV8711 Stepper Motor which is directly controlled by the DRV8711 without having any interface to converts DRV8711 outputs.   

    Upendra Talluri said:
    Why is an external LM5107 gate driver required in the TIDA-01227 design but not in the BOOST-DRV8711?

    Since in TIDA-01227 the DRV8711 is supplied with a 12V input voltage the High-side gate drive pin voltage (A1HS, A2HS, B1HS, B2HS) will be VM +12V whic his not enough to turn on 100V FETs. So the LM5107 is used. The LM5107 is an Interface between DRV8711 and high-voltage FETs and converts DRV8711 outputs from 0 V to 10/22 V into 0-V to 3.3-V inputs at the LM5107 ad then provide high voltage gate drive signals. 

    Upendra Talluri said:
    In my custom design (4-channel DRV8711 board using SQJ952EP-T1_GE3 MOSFETs), do I also need to include an external gate driver to ensure proper MOSFET switching and performance?

    The provided schematic screenshots are not clear enough. if same VM voltage is connected to DRV11 and extrenal FETs, there is no need to use any external gate driver. 

    Best regards, 

    Mojtaba