I have two LM5069MMs on my design.
The problem is when I turn on the system power, one of LM5069 with 85uF load can be turned on sometimes and can't be turn on sometimes.
I have checked the Timer pin of LM5069 when it can't be turn on, it shows "low" always.
Please let me know any suggestions.
My LM5069 is -1 device.
I will try LM5069 -2device.
I have measured the Timer pin when system power turn on: it is always "low".
But another LM5096 can be turn on each time.
What is the reason for this?
Any suggestions are appreciated.
When the device is first turned on, the timer will ramp up during the "insertion delay" period on all LM5069. After the insertion delay period, the timer will then ramp during current limit or power limit conditions. These can occur on startup with large capacitive loads. When the timer reaches the voltage threshold, the device will pull the gate low. If your device is a LM5069-1, then it will not attempt to restart. If it is an LM5069-2, then will go through a retry delay period and attempt to start up again afterwards.
If you are looking at a -1, then it has probably hit current limit or power limit on startup and is not retrying.
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.
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.