Part Number:BQ40Z50
Hi Team,
As far we know, we have a spreadsheet to calculate ext temperature coefficient by Norm R/T table of NTC. However my customers used older bq30z50 series table to calculate and program to bq40z50 DF. There should be thermistor temperature error because of the wrong process.
Thus, they would like to input the wrong temp coefficient into bq40z50 spreadsheet to know this error, but it fails. Could you help to modify exist spreadsheet to support this feature?
Part Number:LP5024
We are facing problem in working of LP5024 IC.
IC is not switching ON when being powered up from a valid Vcc of 3.3V
VCAP voltage is 0V
When we check Pin 31, we are getting 1.8V LDO output which is in contrast to datasheet which says pin 32 is 1.8V LDO.
Can you please let us know if are missing something .
Also find attached Schematic ..
Please let us know how we can resolve this issue.
Part Number:BQ2083-V1P3
What is the consumption of the bq2083 while it is in sleep mode. It cannot be found in the datasheet anywhere. I've asked customer support for this answer and they referred me here because they could not find it in the datasheet --- which is the first thing I mentioned when I asked the question. I'm guessing the sleep mode current consumption is on the order of 1uA or less. Is this so? And yes I know, this is a NRND part --- my client has a legacy design I am supporting. Can I get a definitive number for sleep mode Iq please? TIA
Jim
Part Number:UCC256303
Hello dear engineering friends !
Iam designing 7kwt dc-dc converter that converts 750v DC into a 48V DC (140A) using LLC topology.working frequency is 45khz when at full load and up to 200khz when idle.and the problem is with transformer design.i have tried 6 different transformer constructions and all of them heat up very fast and severe.
All other components of the converter are at 50C,which is very fine as for me. transformer gets hot up to 70-80C on the surface of the winding just in 10 minutes under full load.
My first transformer designs where so called integrated designs,where resonant inductor was incorporated in a transformer using leakage inductance between primary and secondary.that design showed rapid heat build up on the surface of the primary which was facing secondary (primary and secondary where separated in space,thus big leakage inductance present). then i have read about proximity effect and made a conclusion that i have to make separate external resonant inductor and transformer should have lowest value leakage inductance as possible,because if i got it right,leakage inductance makes eddy currents and thus heating nearest layers of the winding leaving all the rest layers cold.
All the transformer designs had air gap at the ferrite core (1mm). Main core is EE85 big peace of ferrite (860mm2 Ae).
So i have proceeded to a foil secondary winding and finer litz wire (600x0.1 instead of 0.46x32). secondary winding is center tapped (half bridge synchronous rectifier) 2+2 turns 0.2mm foil 53mm wide.10mm2 for a 140 and 50% duty cycle and primary winding is 16 turns (8+8 in series) 0.1x600 litz wire,half of primary is outside of secondary and half of it is inside in it.
That kind of design i have looked up in the infineon evaluation board of a 3 kwt llc converter appnote (www.infineon.com/.../Infineon-ApplicationNote_Evaluationboard_3kW_dual_phase_LLC-AN-v01_00-EN.pdf you can check it on the 25 page. infineon design has even more secondary turns with a foil (5+5), it also has air gaps on all three limbs of ferrite,it also has external resonant inductor. but somehow it work on a fantastic 100khz+ frequency,where all the skin effect and proximity effect are very limiting.
i have used spacer to pull inner layer of a primary on a bobbin away from a fringing air gap field. but that doesnt helped alot.transformer runs very hot,isolation start to boil after some working time.
Please give me some reccomendation about a design i could try to solve my issue
Part Number:BQ35100
Team,
We are looking in to the EOS mode of BQ35100, utilizing a Lithium-Chloride battery.
It would appear that EOS Detection Pulse Count Threshold is something that we need to set to optimize the short and long trend average. Is that accurate? Do we have any examples for this? Ideally, the customer would like to poll the gauge once per day.
Also, can you comment as to how accurate it is to run the gauge in accumulator mode, and then compare the accumulated charge with the battery capacity to determine if the battery is at the EoL?
Part Number:BQ40Z50-R1
Hi,
I have a similar issue as a previous thread that went unresolved: https://e2e.ti.com/support/power-management/f/196/t/543691?tisearch=e2e-sitesearch&keymatch=bq40z50%20rsoc%20not%20decreasing
I am using chemID 444 (and those cells) in a 4S12P in a phosphate battery. I have seen the issue on multiple batteries that were programmed with a golden file and had a good field QMax update, as evident by Update Status = 0x0E.
From the image below, it appears as though RSoC reaches 100% prematurely, and also stays at 100% for an extended period of time after the discharge. The initial SoC is also quite off, which tends to happen while the battery rests.
Part Number:BQ40Z50-R1
We have one battery pack that is showing RSoC being 0 after charging and sitting for 24 hours. When checking the BattStat, we get 0x03C0. This seems to indicate the charging chip gauge is still in initialization. If we briefly connect to a power supply, the BattStat changes to 0x0080. That seems to indicate the gauge initialization is complete. We noticed that battery current is -8 but jumps to 580 when the the BattStat changes to 0x0080. As soon as BattStat changes to 0x0080, the RSoC jumps to 100 (we expect it to be at 100 the entire time). We believe it charged so it's unclear why we are seeing RSoC at 0. We have 3 other packs and they are not having this issue. Is there an error happening? Am I missing something?
Part Number:BQ25713
Hi Team,
My customer has encountered some strange behavior with the BQ25713. They are noticing that in 2 out of ~160 operating units, everything is working fine, things are charging and then one day it just stops charging the battery (one unit after 4 days, the other unit after 3 months). I2C communication is fine, BQ chip isn't reporting any faults, it is reporting the input/output/battery voltages correctly, but the output voltage is just the battery voltage and it isn't charging the battery.
We've been able to capture an instance of this event out in the field, as summarized by the description and plot below:
Dark blue = input voltage
Light blue = battery voltage
Purple = input current
Green = battery charge current
Currently my customer has a setup in their lab that is able to recreate this issue, so I'm hoping you can help provide us with some pointers on what could be going wrong.
Thanks,
Mitchell
Part Number:BQ78350-R1
Discharge FET control using Key Input. I'm attempting to use the KEYIN pin to control the Discharge FET on a design that uses the BQ76940, BQ76200, and controlled using the BQ78350-R1. When the KEYIN pin is set to the off position the Discharge FET's toggle on and off ever few seconds. This happens only if the battery charger is charging the batteries, but not when the charger is disconnected. This behavior is unexpected. In my application the charger is attached all of the time and I need a way to turn off the output FET's
Is this toggling of the DSG FET expected when using the KEYIN to control the output?
What is the recommended way of controlling the DSG FET?
Does the R2 firmware address this Behavior?
Thanks in advance for your help.
Part Number:BQ76PL455A-Q1
We have 20 cell battery packs. We want to use two BQ76PL455A chips, BUT because of power considerations, we need to connect first 10 cells of the pack to chip-one (BQ76...) and the second set to chip-two(BQ76...). And have the two chips balance charge (passive) the battery pack. Please note, because of constraints we cannot do 16 cells of the pack on first chip and 4 on the second.
Is it possible to connect the first 10 on chip-one, and connect the remaining cell connections to the highest cell voltage (this is a valid connection in the data sheet); AND then connect cells 11 to 20 of the pack to the sense lines 0 to 9?
Part Number:TLVH431
Tool/software:TINA-TI or Spice Models
Hi,
several weeks ago in February I reported some problems with the SPICE models of the shunt regulators TLVH431, TLV431 and LMV431.
I got the answer from Arpan Gupta that there would be an update for the models soon. Unfortunately, until today I see the same SPICE models on the website as before..
The thread has been locked. In the meantime nearly two months have gone, and I have the same problems as before. Please let me know what has happened.
Best Regard
HaJue
Part Number:UCC28070-Q1
Hi all,
I am looking at the datasheet of the PFC controller (UCC28070-q1). There is an equation which i didn't understood
Vac=73*Vrms --(Page 23)
I couldn't find any relation like this on internet. Is this equation correct?
Part Number:TPS3851-Q1
Hello team,
I received the question from the customer about TPS3851-Q1 RESET.
In the datasheet, ". During startup, the state of RESET is undefined below the specified power-on-reset (POR) voltage (VPOR). Above POR, RESET goes low and remains low," The question is that the maximum time from the undefined status to RESET LOW status as below.
Would you please advise?
Your advice would be so appreciated.
Best Regards,
Akihisa Tamazaki
Part Number:TLV757P
Hi TI,
Datasheet page 1, shows that Available in fixed output voltage - 0.6V to 5V (50mV steps)
But there is no part number TLV75708PDBVR. 0.8V Fixed output part is not available?
Part Number:TPS65094
According to the TPS650942 datasheet, the switching frequency of SW1 is 1MHZ ,
may i know 1Mhz have any tolerance,
I use short pin for probe to measure, The current amount of switching frequency of about 715KHZ.
Part Number:TPS2331
Hi TI,
Could you recommend hot-swap protection solutions for the I/O ports?
Actually, we're using SN74LVC244APW for this. but it is not a product that is originally used for this purpose. right?
Part Number:TPS92692
In the datasheet of tps92692 it says that the IADJ pin supports maximum voltage of 5.5V. If I apply a voltage greater than 2.1V (section 9.2.2.2.9 Programming LED Current) on the IADJ pin, will the LED output current be greater than that calculated using the RCS resistor? By the formula: RCS = 2.1 / (14 * ILEDMAX). Or is the maximum value of the output current calculated by the previous formula?
Part Number:TLV62585
Hi Experts,
In addition to using the feed forward capacitor , Is there any other way that could reduce the ripple voltage on PSM mode ?
My input is 3.3V, output : 1.2V/Max 0.75A, Normal is less than 0.2A.
Thanks.
