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: LM66100
I want to use LM66100 with 3 battery. It is working when I connect 2 batteries. But when I connect 3th battery, total current goes up, and current flow from battery to battery. Is there any problem on the following schematic?
I see you have an Or-ing circuit built for three voltage inputs. Can you please describe your test case further (what order the inputs are connected). It is important we know the sequence of events to narrow down our support.
When you say "total" current goes up, do you mean total load current? And also you are noticing current flow to and from what inputs?
To find the latest information on Power Switches, visit www.ti.com/powerswitch
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 Shreyas Dmello:
Just want to follow up on this thread. Have you worked around you issue?
Hi again.I have tested the system. The description is the following.I have a power supply with 2 outputs. And I have a 18650 battery. Power supplies output has own ampere meter.I have connected Vin1 input of circuit to power supplies first output.I have connected Vin2 input of circuit to power supplies second output.I have connected the Vin3 input of the circuit to the battery. And I have connected amperemeter and voltmeter on this input. The following measurements are get when voltage change slowly. (about 100mV step/s) They are expected results.
But, when I change voltage faster (about 500mV/s) results are changed. The following results are gets when I move the knob of power supply rapidly.
I think U18 and U16 are on state during same time. Maybe response time of LM66100 is slow.I have changed the circuit. I have added 3 additional LM66100. I think this circuit can blocking reverse current. But my application is low power application so this is not my first choice.
In reply to Burak Selamlar1:
I do not think U15, U17 and U19 will turn on due to the low voltage difference between the output and input. I would not recommend this.
Could you please probe the input of U16 and the input of U18? I would like to see the voltage on those nodes during this reverse current event.
Hi,I have measured the input voltage of U16 and U17 during the reverse current events.
I have connected Vin3 input of circuit to power supplies first output.I have connected Vin2 input of circuit to power supplies second output.I have connected the Vin1 input of the circuit to the battery.
Measurement results are the following.
Input of U18 : 4,335VInput of U16 : 4,357V
After this measurement, I have disconnect battery(Vin1) and measure again,
Input of U18 : 4,388VInput of U16 : 4,397V
I think, U18 is on state still.
I have changed R44 and R42 to 100kR. After this modification, circuit characteristic has changed. Now, every time occurs reverse current.
Reverse current flow stops when I touch R44-U18.5. What is the ideal value of R44 and R42? I experience this problem more often when I increase R44 and R42.
From your measurements, I think we can confirm that both LM66100s are on at the same time.
What is strange is that this works when you are changing voltages slowly but does not when the voltage rises quickly.
When you are increasing the voltage "quickly" are you sure that there is no overshoot from the supply?
Before you raise the voltage on the supply, the battery(VIN1) was powering the output, correct?
Can you share any voltage waveforms that describe this event?
Edit 10/25: Have you managed to work around your issue?
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.