infineon4engineers Facebook

infineon@google+ Google+

infineon@linkedin linkedin

infineon4engi@twitter twitter

infineon@youtube youtube

+ Reply to Thread
Results 1 to 2 of 2

Thread: BTN8982TA Half Bridge Motor Driver

  1. #1
    raney
    Guest

    BTN8982TA Half Bridge Motor Driver

    Hello Everyone!

    This is my very first post at Infineon Forums.
    I am using BTN8982TA Half Bridge to drive a 12V 250W DC motor. I have used the schematic given in the application note of BTN8982TA (Attached Below). A PWM of frequency 490Hz is used to vary the speed.
    Click image for larger version

Name:	BTN.jpg
Views:	6
Size:	49.4 KB
ID:	2548
    When I drive the motor with the circuit, the circuit draws more current than what the motor draws at full 12V. I have tried varying the slew rate resistor from 5 Ohms to 51K Ohms. But it did not change the current. I am guessing a cross conduction between the PMOS and the NMOS.
    Will increasing the PWM frequency help?

    Kindly provide a solution for this problem.
    Thank you.

  2. #2

    Infineon Employee
    Infineon Employee
    Jing.N is on a distinguished road
    Join Date
    Jun 2018
    Posts
    29
    Cross current protection is integrated into BTN8982TA. It means we have a voltage comparator being used to check the Vgs voltage of the MOSFET which is switched for the moment. Only if the Vgs is lower than the threshold voltage, the other MOSFET can be switched on. Therefore this active cross current protection feature can avoid the cross conduction between PMOS and NMOS.

    Could you please clarify how you measured the current? Did you measure the current at Vs pin? Or you convert the current at IS pin to voltage?
    If you measure the current at IS pin, you will see offset current when the output current is 0A. Please use the following way to calculate the load current: IL = dKILIS * (IIS - IIS(offset))
    Please find the detailed explanation in Chapter 4.2 and Chapter 4.5.1.1 in our application note:
    https://www.infineon.com/dgdl/Infine...3fc8d88e3d430a
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

+ Reply to Thread

Tags for this Thread

Disclaimer

All content and materials on this site are provided “as is“. Infineon makes no warranties or representations with regard to this content and these materials of any kind, whether express or implied, including without limitation, warranties or representations of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, whether express or implied, is granted by Infineon. Use of the information on this site may require a license from a third party, or a license from Infineon.


Infineon accepts no liability for the content and materials on this site being accurate, complete or up- to-date or for the contents of external links. Infineon distances itself expressly from the contents of the linked pages, over the structure of which Infineon has no control.


Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Usage Terms of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Usage Terms of this site. Infineon reserves the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.