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.
Part Number: UCC5310
How do I implement interlock protection using the UCC53XX family?
Gate Driver Applications
Dallas, TX USA
We have an excellent training series that can help answer all your questions about our gate drivers. It is indexed so you can jump right to the section you want! You can find it here. A second series focused 100% on Isolated Gate drivers may be found here.
We also provide models for our gate drivers to accelerate your time to market. You can find them in the Product Folders under the "Design and development" tab:
What is interlock protection, and how is it implemented in a driver?
IGBTs and Silicon/SiC MOSFETs are critical to the operation of the system in which they operate, so it is important that they are protected. The devices are not only crucial for efficient operation; they are also one of the most costly components in a system. When devices are arranged in a half bridge, as shown in Figure 23, they cannot both switch on at the same time. Thus, dead time is used before the switches change states and both devices are turned off momentarily during the switching cycle. If the devices turn on at the same time, shoot-through will occur and cause a large current spike and potential failure. Shoot-through can occur in the event of an incorrect dead-time calculation that is too short, varying propagation times between drivers, or noise at the input. Interlock is a feature in gate drivers to prevent shoot-through. Logic circuitry combines the positive and negative inputs of a gate driver such that they can never be on at the same time. Think of it as an integrated dead-time feature that takes delays inherent to the driver into account. Even if there is an error in the user-programmed dead time, the driver interlock will not allow both outputs to turn on, thus preventing damage to the half-bridge switches. Interlock can be implemented for single-output or dual-channel drivers, as shown in Figures 24 and 25. In a dual-channel driver, the input channels are tied together internally; in single-output drivers, the inputs are tied together externally.
Specifically for UCC53XX devices tagged in this post (all but UCC5304 which has a single-input and requires an external logic gate to implement interlock), here is a modification to an app note that discusses using the UCC53XX devices in a half-bridge. For example, I have modified Figure 5 to include the interlock functionality. The high-side input is provided to IN+ of the high-side driver, as well as IN- of the low-side driver. Similarly, the low-side input is provided to the IN+ of the low-side driver, as well was IN- of the high-side driver. This, if there is an error condition in the controller which tries to drive IN+ of the high-side, and IN+ of the low-side drivers high at the same time, these new connections shown in red will prevent both drivers from turning on and causing cross-conduction, or shoot-thru of the half-bridge transistors. This will prevent them from becoming damaged during this logic error. Please see Tables 4 and 5 of the UCC53XX datasheet to understand the logic of the input terminals.
Please see this excellent document for more information on IGBT & SiC Gate Driver Fundamentals. Interlock is discussed on page 18.
If you have further questions about this topic, or any other topic, please post a new/related question and our team will be happy to help you.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
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. 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.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.