half bridge control using ucc 27201

This question is not answered

Posted by Shantanu Deshpande

on Jul 07 2011 00:03 AM

Prodigy20 points

i am trying to control a half bridge using ucc27201

i am succesful in contorlling the lower mosfet but i am unable to control the upper mosfet

i have connected a 0.1uf ceramic capacitance between HB and HS.

does the bootstrap function not ocuur properly due to this capacitor

do I need TO change capacitor if my operating PWM frequency is 32KHz

or is there some other problem

All Replies

Posted by Matthew Ramage

on May 24 2012 00:37 AM

Prodigy10 points

Did you have any luck solving this problem?

I'm also having issues with the high side not driving properly. I also think it is due to the bootstrap not functioning properly.

I'm driving IRFS3107 Mosfets.

More info:

Here's the schematic (note: the mosfets have been changed. I'm actually using the IRFS3107)

The battery voltage is 28Vdc, the inputs to the mosfet driver are 0-5V dc signals from a microcontroller (not pwm).

TI E2E™ Community

TI E2E™ Community Groups

Other Communities

Other Technical & Support Resources

All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.

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 Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. TI, its suppliers and providers of content reserve 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.

m.ti.com (Mobile Version)

TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs and
embedded processors, along with software, tools and the industry’s largest sales/support staff.