Part Number:TPS79501-Q1
Hi Sir,
My customer is looking for a P2P second source to replace LD39050PU33R, I could not find a exactly P2P device on ti.com.
Could you kindly help?
The package of LD39050PU33R is 3mmx3mm and most of TI LDO is 2mmx2mm.
https://www.st.com/resource/en/datasheet/ld39050.pdf
Thanks,
Patrick
Part Number:LMR16030
Hi Sir,
My customer is looking for a P2P solution to replace the ST1S14, but I could not find a P2P solution on ti.com.
Could you help to advise if TI have P2P solution to replace ST1S14?
https://www.st.com/resource/en/datasheet/st1s14.pdf
Many Thanks
Patrick
Part Number:BQ25713
Hi team,
I am using BQ25713 to control 2s Li battery. But I have below 2 question when I go through the datasheet.
1. pre-charge current and charge current are both setup by REG0x03/02. So how should we configure the pre-charge current? And the 9.6.3.1 said ' For 2-4 cell battery, the system is regulated at minimum system voltage in REG0x0D/0C and the pre-charge current is clamped at 384 mA'. Does this mean the pre-charge current is fixed 384mA for 2 cell battery and it is non-configurable?
2. How does BQ25713 determine if the battery is fully charged? I didn't find the termination current data in the datasheet.
Hope you could help on this. Thanks.
Best regards,
Wayne
Part Number:BQ51051B
hi!
I have a project with a soft battery pack, they can go up to 45°C in charge, then I'm trying to limit the charge of the battery with the NTC connected to the TS input, I have the calculator in excell for the resistors, but seems like the the range can only be extended beyond the 60° not narrowed in this way. Is there a way to make this range narrow? also in the drawings of the datasheet it seems like there are 4 comparators and one is set for 45° already, is there a way to use it instead of the one in the 60°?
Part Number:LM5009
Hi
Our customer uses LM5009 on their application. They found a sample that the frequency is 7kHz. (The setting frequency is 30kHz.)
Does this device has such a large variation of frequency at continuous conduction mode if all external condition is same? (Is this normal variation?)
According to datasheet, Ton is defined as bellow.
So,I think the variation of frequency is similar as the variation of Ton if the all condition(Vin, Vout , Iout, the external components) is same.
Is my understanding correct?
Best Regards,
Koji Hamamoto
Part Number:TPS2557
Dear Team,
I have two question regarding "ton" below.
Q1.
"ton" turn on delay time is defined as max 9ms according to the datasheet page 6.
I can find ton is around 3.8ms at Figure 1 in datasheet page 7.
Could you let me know the reason why "ton" needs such a long term.
Q2.
When EN goes to Low just during ton term after set EN from Low to High, does TPS2557 turn on SW or keep to turn off?
Best Regards,
Hirokazu Takahash
Part Number:LM5117
Hi expert,
Customer is using our LM5117 in their infotainment application. Condition is 11V/9.5V/6.5V to 5V/12A. They want to tie VCC to Vin with a low pass filter to increase efficiency. Would you kindly help to verify if we can connect external VCC source to VIN? Thanks!
Best regards,
Ann Lien
Part Number:LM2662
To obtain the lowest ripple noise, is it better to use a ceramic MLCC capacitor or polymer capacitor ? Ceramics are generally recommended for their low ESR but I see polymers available with 5 mOhm at 100 kHz. Polymers are available in higher capacitance than ceramics (hundreds of uF), in relatively small size and are claimed to not vary their capacitance with voltage (although X5R also have low capacitance variation with voltage). I will operate at -5V, 150 kHz, less than 50 mA.
Steve
Part Number:BQ30Z554-R1
Hi,
Can someone tell me exactly the commands required to write/receive to the gauge in order to unseal it, because the steps listed in the technical reference do not unseal the device. Also, someone here said that unseal code for these devices would be 0x0414, 0x3672. How will be used or where should they be written in order to unseal the device?
Thank you,
Ciprian
Hi Team,
Do we have alt.s solution to replace EJ179?
EJ179 is doing power sink role only and it can support two PDO.
PDO0: 5V
PDO1: 5.5V.
BR,
SHH
Part Number:TPS61099
Hi guys,
My customer has a worst case spec of 2.8Vin, 3.8Vout @ 450mA. I calculated that the SW current would be ~.89A which is greater than the min spec in the datasheet of .8A.
Should we choose another part? any recommendations?
Thanks,
Brian
Part Number:TPS65150
Hello
LCD application ,VDD=3.3V, AVDD=13.28V,VGH=22.09V, VGL=-7V; VGH with one charge pump stage.
Fault: it seems could start-up sucessful at the begining, but after 5S, the VGL and VGH go back to 0V, but AVDD is OK just with some ripple; then after 8S ,VGH and VGL try regulating to its target voltage but failed. detail waveform could see in the attached .doc.
At first, I think it may be caused by overload on VGL or VGH,lead to TPS65150 enter in shutdown for out-of regulate protection, but I find AVDD is normal just with some ripple ,so it could not be enter in shutdown.
Secondly, it seems not to be in UVLO ,because of boost converter was working.
So do you have any comment here ?
by the way , today my another customer also find one set TPS65150 board have similar problem, Engineer repeately power ON/OFF VDD 3.3V, some times the board could be start up sucessful,some times it couldn't, the AVDD is ok, but VGH,VGL could not start-up.
(Please visit the site to view this file)
Part Number:BQ27742-G1
Hello team,
See below customer question:
Please check the circuit configuration to determine if the BQ27742-G1 device can be used as shown in the schematic. During a Gerber file edit, I misplaced a trace that should have connected the Vss network around the BQ27742-G1 to the wrong terminal of C11, thus "floating" the chip and tying REG25 (E1) to Vss. Will that damage the chip when power is applied, or will the LDO simply fold back?
Part Number:BQ27Z561EVM-011
Hello,
I am a newbie in battery gauge domain. I need to perform a learning cycle on a NCR18650 Lithium Ion battery by BQ27Z561EVM-011 battery gauge and BQ27GDK000EVM kit. I have already done the current and voltage calibration and uploaded the ChemID.
Now I meet a problem that the learning procedure takes too much time in my case. According to the video guide for learning cycle (https://training.ti.com/how-perform-successful-learning-cycle-gauges?keyMatch=LEARNING%20CYCLE%20VIDEO&tisearch=Search-EN-Everything), in order to accomplish a successful learning cycle, the following steps should be performed:
Step 1). Discharge battery by C/5 rate (in theory it takes 5 hrs);
Step 2). Relax battery for a period of time (according to the guide https://e2e.ti.com/blogs_/archives/b/fullycharged/archive/2016/03/02/how-to-run-a-learning-cycle, it should take at least 5 hrs);
Step 3). Charge the battery by C/2 rate (by the data sheet of NCR18650B, it should take around 4 hrs);
Step 4). Relax battery for a period of time (according to the guide https://e2e.ti.com/blogs_/archives/b/fullycharged/archive/2016/03/02/how-to-run-a-learning-cycle, it should take at least 2 hrs);
Step 5). Discharge battery by C/5 rate (in theory it takes 5 hrs).
Step 6). Relax battery for a period of time (according to the guide https://e2e.ti.com/blogs_/archives/b/fullycharged/archive/2016/03/02/how-to-run-a-learning-cycle, it should take at least 5 hrs).
If the procedure above is correct, the total time of a full learning cycle should be 5 + 5 + 4 + 2 + 5 + 5 = 26 hrs.
In the post https://e2e.ti.com/support/power-management/f/196/t/461819?AutoCycle-BQStudio, it reads that "the Auto cycle feature is not supported using the EV2400". Since I am currently using the on-board EV2400 of BQ27Z561EVM-011, the only choice for me is to perform the learning cycle manually. While normally, no one can keep monitoring the learning cycle for 26 hrs. By this reason, I come out several solutions for my case:
Solution 1). Decrease the time cost of each step listed above, like discharge by a higher rate, for example C/2 and let the battery relax less time, e.g. 2 hours for each step of relaxing. I know this solution looks crazy and probably not feasible. I still want to ensure if increasing discharge rate and decreasing relax time is feasible for the learning cycle. Let's call it Question 1).
Solution 2). Increase the relax time of some relax step in order to separate the procedure into several days, for example:
Day1: Discharge battery by C/5; relax until next morning;
Day2: Charge the battery by C/2; relax until next morning;
Day3: Discharge battery by C/5; relax until next morning.
By this approach, the problem could be solved. While I still have some questions (following previous index):
Question 2): Will the result of learning cycle be inflicted by increasing the relax time?
Question 3). Can I turn off battery gauge and/or GDK during relaxing time?
Thanks for your patience to read my question.
Waiting for your reply sincerely,
Wenlong
Part Number:TPS23880
I am having difficulties programming the SRAM on the TPS23880 device on my embedded board. It appears that the ACK from the 23880 gets missed periodically. (Usually about 2/3 of the way through programming the main SRAM code). Looking at the signal on the scope, it appears that the master I2C clock is ok, but the ACK doesn't appear. From the perspective of my firmware, the I2C driver stalls (times out) and needs to be reset. At the moment, I am not able to resolve whether this is a hardware issue (my pullup resistors are wrong), a driver issue (the clocking is quite right in my firmware) or something isn't quite right in the 23880.
This issue is easily detectable in my firmware's state machine for programming the SRAM. Consequently, if I could successfully restart the I2C programming sequence from the middle, I could recover and complete the process. Is there any way that I could back up to an address that I know I have successfully written, reset the beginning address and continue programming from that point? Also, can the SRAM be programmed by sending blocks of data bytes, or does it have to be programmed one byte at a time?
Any hints as to how to identify the root cause of my problem would also be greatly appreciated. Also, workarounds that get me up and running in the short run would helpful.
Part Number:BQ40Z80EVM-020
Hello,
I am working on getting a valid configuration file together using the BQ40Z80EVM-020 PCB. I have removed D3 and R7 per SLUUBZ5. Unfortunately, I am having some problems getting valid cell voltages. I am using 7 1kΩ resistors in series to simulate the cells, and I do not have anything connected to J1. My pin configuration settings are shown below:
My cell configuration settings are:
For reference, a picture of the jumpers on my EVM are shown below.
When I am looking at the registers for the various voltages, I can see that the BATTERY and PACK voltages appear to be updating. When the PACK pin voltage becomes >35000, I am pressing the WAKE switch.
Any thoughts as to what may be causing this?
Thanks,
Adam Drewery
