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: TPS7B4250-Q1
Could you explain the behavior of VOUT when dead short to GND?
Output short circuit protection is described in the datasheet as protected by the current limit and thermal shutdown,
1. Hit current limit (500mA maximum current)
2. die temperature rises
3. Hit thermal protection at 175c
4. The device shutdown the output
5. The die temperature cool down to 150c
6. The device try to power up and hit current limit
7. repeat 1. to 6.
I would like to know even if the output is dead short to GND, the device tries to power up until the thermal shutdown hit.
It is helpful if you can share the scope shot of this condition.
Your understanding of the behaviors when Vout shorting to Ground is correct. The device will cycle in and out from thermal shutdown which causes a voltage on output up and down from the set output level to ground repeatedly.
Regards, Jason Song
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.
In reply to Jason Song:
When it resumes operation after device die temp decreased to 150c,
does the device power up from internal soft-start?
Or will it power up immediately?
In reply to Shinji Tsuji:
Disabled by the thermal shutdown is different than disabling the device by enable pin. For this case, during thermal shutdown, the pass-FET of the LDO will be disabled but the internal reference voltage may still be there. Once device has been restored to lower temperature, the device will be on again but without the built-in soft-start.
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.