Original Question: TPS62090 and TPS62143 - Is 2V prebias okay? by Bryan McLaughlin
For the TPS62090, I understand there is about 200-ohm resistor to GND during disable. Is it safe for the device if the output will have a DC prebias of about 2V during the disable stage and upon enable stage when the target normal operation voltage is around 2.4V? Input is 3.3V.
Can you say the same for the TPS62143? Datasheet says it's good for prebias startup but I'm not sure if there's a limit.
Bryan, Sunnyvale Field Apps
Verified Answer: RE: TPS62090 and TPS62143 - Is 2V prebias okay? by Chris Glaser
Yes, pre-bias startup for these and other DCS-Control devices is ok as the devices do not sink current.
Question: RE: TPS62090 and TPS62143 - Is 2V prebias okay? by Bryan McLaughlin
Just to make sure - you are saying the set output voltage neds to be greater than the prebias voltage?
For this application, Vout=2.4V and Vprebias=2.0V
Question: RE: TPS62090 and TPS62143 - Is 2V prebias okay? by Chris Glaser
I'm not sure that a pre-bias above the setpoint makes sense. But in this case, the device will also not sink current. It will just sit there and not switch.
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.