Hello,
for my application i have a standalone chip doing the battery SOC estimation from a 3 cell LiPO battery. Problem is that the chip needs a regulated voltage of 3.3v as an input and the current consumption is about 15uA (max. 30 uA). Could someone give me any recommendations on which chip i should use to convert from the 10-12.6V of the battery to the given output values? Thanks in advance!
Regards,
Emmanuel
Part Number:TPS61178EVM-792
Using the development board, input voltage is 12V from 3 18650 batteries and output is at 16V. Perfect! Just not getting enough current to run our motor. We are using batteries, so our input voltage can be between 4V and 12V and we would like the output at 16V. We need up to 6A under our heaviest load, but typical is 3A. At 6A, we would like to cut the power and resume when the load is under 6A.
Can you please recommend a part for us (hopefully with an eval kit) that would make more sense for us?
Thank you!
Part Number:LM5060-Q1
The LM5060 circuit is set with OVP at 17V and UVP at 10V. Testing confirms that the LM5060 shuts off when the BATT (schematic attached below) voltage exceeds 17V, and turns on when BATT is below 14.9V. I've noticed that if I disable the gate driver by driving the EN pin low when 14.9V < BATT < 17V, the LM5060 does not turn on when I drive the EN pin high again.The LM5060 will stay off until BATT drops below 14.9V, just as if OVP had been triggered.
However, if I toggle the EN pin when BATT < 14.9V, the LM5060 behaves as expected i.e. turns off when EN pin is low and turns back on when EN pin is high again. I've observed this behavior when the OVP is set to 14V and 17V, and when the buck converter is connected and not connected.
For example, I set BATT=16V. I press the button S1 which disables the LM5060. I let go of S1, but the LM5060 won't turn on and FAULT is high. If I decrease BATT below 14.9V, the LM5060 turns on.
I've looked for a voltage spike on BATT that could trigger the OVP, but I haven't found such a spike. I do not have any issues with the EN pin when BATT is near the UVP threshold.
Is what I'm observing expected behavior for the LM5060? If so, I'm having trouble finding this in the datasheet.
(Please visit the site to view this file)
Part Number:BQ25883EVM
Team,
Please provide assistance in getting the EV2400 talking to the BQ25883EVM eval module. Here is customer's experience so far:
The BQ25883EVM eval module’s User's Guide (SLUUC10–February 2019) instructs:
“With the EV2400 connected to the PC and the EVM, launch Battery Management Studio (bqStudio).
Select Charger and the BQ25881 evaluation software.”
And in another place the user’s guide instructs:
“With the EV2400 connected to the PC and the EVM, launch Battery Management Studio (bqStudio).
Select Charger and the BQ25883 evaluation software.”
With BQSTUDIO version v1.3.86.3 installed on my Windows PC, there is no BQ25881 or BQ25883 listed as a choice in BQSTUDIO.
There is a newer “Testing Purposes Only” version of BQSTUDIO (v1.3.92.3) on TI.com, but I get an error attempting to run this newer, test version.
Any help would be greatly appreciated.
Thanks
Viktorija
Part Number:BQ27421-G1
Hi Team,
My customer has a question regarding the GPOUT pin on the BQ27421-Q1.
In the datasheet it says that GPOUT should be pulled to VDD even if it is not used. Right now in their system they have this pin pulled high to the BQ27421-G1 1.8V rail and going to a GPIO on their host MCU. When the system is in shutdown (MCU off) the fuel-gauge stays ON and this 1.8V rail from the fuel-gauge remains high. Unfortunately this voltage leaks back into their system via the GPIO on the MCU. What happens if they do not keep GPOUT pulled high with the fuel gauge on? Will it cause unexpected chip behavior, or just increased current draw?
Thanks,
Mitchell
Part Number:LM5122
Hello
Part Number:TPS54560-Q1
I'm using the TPS54560-Q1 Step Down DC-DC Converter the input is 24V the output is 5A/5V, do I need a fan or/and thermal pad to help cooling the device.
Part Number:TPS62135
Good afternoon....
I am running a TPS621351 (as seen in Simplified Schematic Figure on page 1 of datasheet)....12V in and 9V out....This in turn runs through a diode and feeds a Battery Charger BQ2057WSN....I have a board that was working fine and then draws 'irregular' current....When working I would draw about 0.9A input to feed 1A to the battery....The board now draws about 2.1A...I've found that if I touch the junction between the resistors that form the feedback divider my current goes down to normal....This event only works when I touch with capacitance (ie an insulated tweezer has no effect but if I touch the metal of the tweezer all pops back into place)...On none of the designs in the datasheet do I see a capacitor for noise on the feedback (I do see a feed thru capacitor but do not have this on the board)......
I resoldered the junction in the event it was a floating input voltage on the pin of the feedback....The feedback circuit is out near the capacitor bank and not directly at the chip so I am confident the chip is soldered well...The board saw temps on the order of 64C
Any ideas???
Thanks
Steve
Part Number:TPS543B20
I have a stand alone TPS543B20, configured similar to the eval board;
Mode resistor: open
RT : 28.7K
ss: 34.8K
VSEL: 51.1K
ILIM: 24.9K
RAMP: 187K
When I enable this regulator, I do not get any output when I have no signal on SYNC (it is held low by inactive clock driver).
When I apply an external 700KHz on SYNC, I do get the expected 0.9V output.
Why does this not come up using the internal frequency set by RT?
8.4.9 Synchronization and Stackable Configuration
The TPS543C20 device can synchronize to an external clock which must be equal to or higher than internal
frequency setting. For stand alone device, the external clock should be applied to the SYNC pin. A sudden
change in synchronization clock frequency causes an associated control loop response, resulting in an overshoot
or undershoot on the output voltage.
Part Number:TPS7A78
Hello,
I'm using the TPS7A78 part in FB mode to power digital circuits; in this case GND is not connected to AC-(Neutral) line. The GND line is tracking the AC- line, which could be the hot or neutral line and so far using the demo boards (connecting the TPS7A78 to my digital demo board), I have no issue operating the digital circuits. Should I be concerned that the GND of the digital circuit is tracking the neutral/hot line, in case I swap the polarity of the cable.
I believe that what should matter to the digital circuit is the diff potential, unless there is a leaky active device in the digital circuit. Should I take any precautions, such as adding protective diodes for reverse bias?
Would there be any long term reliability issues?
Thanks.
Sana
Part Number:TPS62748
Hi,
for the TPS62748, there are no limits for the inductance in comparison to other devices like TPS62740 where the recommended maximum inductance is 3.3 uH. What is the maximum inductance for the TPS62748? I'd like to increase it as much as possible to decrease output ripple.
Regards,
Jonas
Part Number:TPS53641
Tool/software: WEBENCH® Design Tools
Chasel,
I would like to have your input on following general question regarding TPS53641. You input is very important to me.
In our current design aroung Xeon processor (Broadwell), we are using 3 of TPS53641, these controllers are used for 1.05V, 1.2V, and 1.8V voltages required of Processor.
We need to do voltage margining (+/- 5% of nominal voltage) of board. My understanding is for voltage regulators reporting to these three controllers we don't need to
do +/- 5% voltage margining as they are already very tight, and the controller doesn't allow to VR to be drifting away from nominal values of 1.05V, 1.2V, and 1.8V. What I have
seen in the these boards I worked with, is that the voltages are very solid, and very very close to VOUT_COMMAND. As a result there is no need for voltage margining. what do you
think? If voltage margining is recommended how is it done in TPS53641.
Part Number:LM5164
Hello,
I have a design that I extracted from Web-bench. During verification of the power supply, when I powered the board with 70V DC the IC exploded at pin 2. I have looked at the Absolute Maximum Ratings and don't see anything the design is violating. In another instance, the board was working fine at 60V; however, when I increased the load on the supply, the LM5164 also died. The load current does not exceed 0.4A in worst-case use (actually closer to 0.37A).
I would appreciate any suggestion. I'm posting a picture of the failure and the schematic (which like I said, I derived from Web Bench). Note: the circuit Vin is only supposed to reach ~98VDC in cases of failure and I designed this circuit to withstand this voltage. In normal operation Vin should be less than 30VDC.
Thanks
Part Number:UCD90120A
Hello,
The UCD90120A datasheet recommends the decoupling on BPCAP be a 1 uF capacitor in parallel with a 0.01 uF capacitor.
In the interest of BOM consolidation, I'd like to change the 1 uF to a 4.7 uF (still MLCC), and keep 0.01 uF the same.
Is this acceptable?
I wanted to make sure there weren't any stability concerns for the internal regulator with the larger capacitance.
Thanks,
Jonathan
Part Number:TPS65023-Q1
Hi Team,
I'm looking for ideas on how to add PG functionality externally to the TPS65023-Q1 so that it can be sequenced without a host MCU. I understand the status of the rails can be monitored through the device's serial interface, but my customer is looking to use this device in a standalone fashion.
Have you seen anyone do this with external circuitry before?
Thanks,
Mitchell
Part Number:TPS1663
Hi team members.
Can I connect the OVP terminal to GND?
I don't use over voltage protection.
Part Number:TPS23880
Hi,
My customer are designing an 8-port POE switch, with a maximum power supply of 60W at a single port, using 4-pair power supply. In this case, two TPS23880 are needed. How do they connect with each other and how do they connect with I2C Host? Is there any reference design for this part? Thanks.
Best regards
Part Number:TPS2660
I have a question regarding TPS26601 which I use as power supply protection. I am using it in circuit breaker latch mode for overvoltage, undervoltage, overcurrent and also short circuit protection.
From my understanding, the fast-trip comparator in the eFuse will turn off the internal FET when current through the FET I(load) exceed I(fasttrip) in the case of short circuit event. My questions are:
1. In the event where a second inrush current event occurs after Vout has reach steady state, if the inrush current level exceed I(fasttrip) - not to the extent of very high current peak similar to short circuit to ground – will the fast-trip comparator be triggered?
2. Will the fast-trip trigger level be the same as 87% above the set current limit in the case of inrush current event during steady state?
3. Is there any high current pulse duration requirement for the fast-trip comparator to response?
4. How do I estimate the min and max fast-trip comparator threshold levels as datasheet only specify typ?
I am observing a second inrush current event in my board when the Vout has already reached steady state (as shown in the attached waveform) and the level is above the 1.87*I(ol)+0.015A threshold but the fast-trip comparator is not triggered. I did an experiment to determine the level of current peak that will trigger the fast-trip comparator and found out that it is 2.27*I(ol). I would like to get more info on the reaction of the eFuse towards inrush current that occurs during steady state and what are the levels that will shut off the eFuse, so that I can move forward to optimize my design. Thanks!
Part Number:TPS54426
soft start capacitor is 3300pf in reference design, the start time is too long for us, i modified it to be 330pf. i want to know how about the suggest range of soft start capacitor? is there any harm if the capacitor is too big or too small? thanks!
