Following is a customer question and observations regarding charging.
Q: During automatic AC charging correct VBAT levels are not seen, i.e. device powers up at 3.6V instead of 3.2V.
A: Customer setup was an issue. Customer was using a DC supply/source meter instead of a real battery. The power supply/source meter used showed the voltage level at 3.6V. However, the actual voltage seen at the VBAT pad on TPS65950 was 3.2V. The setup and board conditions were not ideal and hence customer was seeing the problem. The supply impedance may sometimes cause problems when used as above. The voltage drop from the supply to the VBAT pad shoulbe be checked.
It is always better to measure any voltage levels at the device pins/pads (at least closest to the pad) to avoid such errors. When the customer used a regular Li-Ion battery there were no issues.
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.