Part Number: BQ40Z50-R1 Hi, We have a bq40z50-r1 based project, 4s16p, CHEM ID 0x0444, after a pack is programmed with golden .srec file and done proper calibration, before the pack can report a proper rsoc, should it do learning cycling? if it is needed, how many cycling it should take for remaining capacity/rsoc .etc to become accurate? Please advise. Thanks, Joy
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Forum post: BQ40Z50-R1: How many cycling should a pack take for an accurate rsoc?
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Forum post: BQ40Z50-R2: bq40Z50-R2 How to read PACK pin voltage.
Part Number: BQ40Z50-R2 bqStudio shows a BAT pin voltage and a PACK pin voltage. They are typically slightly different when the CHG & DCHG FETs are on. When the CHG and DCHG FETs are off, the BAT pin voltage shows 0 as one would expect. My question is this: How does one read the PACK pin voltage? I cannot find PACK pin in the list of Manufacturing Access commands or in the list of SBS commands. There are commands for each cell voltage (0x3C-3F) and for the sum of the cell voltages (0x09), which is also the BAT pin voltage. I don't see a way to read the PACK pin voltage through SBS commands that are documented in the bq40Z50-R2 Technical Reference Manual, Rev B. How is this done? How does bqStudio do it? thanks, Bert
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Forum post: LM5066: Rshunt and driving capability
Part Number: LM5066 Dear Team, 1.What is the suitable Rshunt for 75A application? If we choose too large the Rshunt will be too hot, too small will violate the suggestion at datasheet 9.2.1.2.3 2.The customer will drive up to 14MOS, Vgs climb to 10V will take longer than 100ms Do you have suitable circuit to drive 14 MOS, or better device? BR Kevin
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Forum post: BQ25886: D+ D- and OTG setting
Part Number: BQ25886 Only use "Unknown 5V Adapter - 500mA Charger " mode setting, the D+ / D- Floating is ok or need to connect to GND or other ? OTG pin direct connect to GND, right ? If can't use OTG mode . If Icharge setting 230mA , how to setting 12mA Charging Termination current ? B/R Amy
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Forum post: RE: TPS23861: POE connected device not seen by 23861
I did that first. I was able to use the PI Commander to write the the Detect/Class Restart reg 18 and now that port continues to function correctly. Do you what I have to do if as part of power on some software communicates with the 23861 and turn off POE and then later I turn it back on and the device is set to auto, what else do I need to do to make the chip work without writing to the restart register
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Forum post: RE: BQ40Z80: BQ40Z80 automatically shutdown FETs when error occurs
Hello Caner, You can try just disabling protections in general or just not using the FETs?
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Forum post: RE: TPS92692-Q1: Device does not response with a DC LOAD in constant current or constant resistor mode
I believe LED voltage is 14V but will check with the customer.
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Forum post: RE: CCS/BQ76PL455A-Q1: VIN1/VIN2 and VOUT1/VOUT2
Hi User, Thats correct, you can choose your two measurements VIN1, VIN2 based on what typical voltage range your batteries will be in. Regards, Taylor
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Forum post: RE: BQ76PL455A-Q1: Safety Manual (SLUUB67) & FMEDA (SLUUB93)
Hi user, This requires SafeTI NDA, please friend request me and we can privately message. Regards, Taylor
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Forum post: RE: TPS4H000-Q1: Altium designer libary
Hello, Brian can you email me at c-phillips@ti.com. This device should be in the vault and you should have access to it.
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Forum post: RE: LM2936: Output Capacitor Selection
Jason - thank you very much. I look forward to your input.
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Forum post: UCC28019A: Non-Sinusoidal Current and abnormal duty cycle at full load.
Part Number: UCC28019A I am using the UCC28019A for a design that has 185Vac-305Vac input range and 600Watt @ 450Vdc output. I used the Texas Instruments design calculator SLUC117E to calculate the recommended component values. The circuit design works perfectly with loads up to 400Watts however in the 500-600Watt load range the AC line current becomes non-sinusoidal. More Specifically the AC line current waveform appears to be clipped at the peak, however there is no change in output voltage it holds steady at 450Vdc. Using a current probe I checked the boost inductor current waveform and found that at the peak of the AC line where this phenomenon occurs the switching duty cycle is inconsistent. When the circuit is working properly the duty cycle will vary gradually in synchronization with the shape of the AC line voltage, however in this case the duty cycle varies significantly from one switching cycle to the next, but only in the area around the peak of the AC line. Also this issue exists over the entire input voltage range from 185-305Vac. If I reduce Rsense from the recommended value of 100mOhms to 50mOhms the issue disappears. However this is not an acceptable solution because it increases the SOC and PCL thresholds by a factor of 2 which makes the boost inductor design a problem. Using the TI Tina Reference Circuit model for the UCC28019 I found what I believe is the cause, i.e. the voltage on Pin2 (Vicomp) is too high. At a load of 600Watts the simulation indicates that the voltage on Pin2 reaches its maximum limit and results in clipping of the sinusoidal waveform at the peak exactly where the inconsistent switching duty cycle is occurring in my prototype circuit. In an attempt to verify the simulation results i added a 4.3Vzener in series with a 5K resistor from Pin2 to Pin1 to prevent the Pin2 voltage from reaching its maximum limit. This did indeed eliminate the inconsistent duty cycle issue at the peak of the AC line however it also resulted in crossover distortion of the AC line current waveform. Can you please give me some guidance regarding how to make adjustments to component values so that Pin2 voltage (Vicomp) does not max out too soon? Also upon review of the UCC28019AEVM User's Guide, page5, the schematic shows unpopulated components R17 & C9 which connect to Pin2, would adding these components be a possible solution? If so what are the associated design guidelines. Best Regards, Jeff Ferrick
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Forum post: RE: TPS4H160-Q1: Reverse polarity voltage condition
Hello, Are you referring to the TVS diode as a reverse blocking diode? If you have a reverse blocking diode in series with the power supply then you do not need the ground network as no current will be flowing back through the device. There is an app note out about reverse polarity and protection with HSS.
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Forum post: LM5060: Comparable ICs
Part Number: LM5060 Posting for a customer- For our input supply I'd like to provide the following - Reverse Polarity Protection - Over Voltage Protection - Soft Start I've seen the LM5060 that looks like it achieves the first two items. Are there any ICs that implement all 3? Thanks!
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Forum post: RE: TL494: Frequency Fluctuation of Oscillator
Hi Kato, sorry for delay response, I have replied on the email. ——Teng
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Forum post: RE: BQ40Z50-R1: How many cycling should a pack take for an accurate rsoc?
Hi Kang, Thanks a lot for your reply! I will let my customer know this. Right now, for the project, after programmed with golden .srec file, on some of packs, it looks like they need 4 to 5 cycle to get an accurate report. What's your opinion why this is happening? Please advise further. Thanks, Joy
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Forum post: BQ76200: Discharge FETs unexpectedly turned off with rising FET temperature
Part Number: BQ76200 Hello team, My customer is seeing some issues with the NFET High Side Driver BQ76200 in their design. They are seeing Discharge FETs unexpectedly turned off as the temperature of the FETs rises (around 65C). And sometimes this kills the FETs if the load current is very high. They are driving 4 NFETs (IRL7472L1TRPBF) and found out the problem when loading 120A. Later in the lab, they could see Vgs dropping from around 10.5V to 8V (and then hits UVLO) as temperature rises. The customer was able to produce this with a 20A load and blowing hot air to the FETs. Calculation for Cvddcp of 4.7uF show that this be plenty for the 4 FETs that are being driven. I can send schematics if needed. Thank you for your support! Errol
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Forum post: RE: BQ20Z45-R1: Run-time error '6': Overflow
Thank you for the response. This does not help solve the problem, because there is already no device connected to the PC. As soon as I open the program, the error pops up without any device connected to the PC.
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Forum post: RE: 1100 W power supply
Hi Parth, Sorry, TI doesn't have high power MOFFET for sale, we only have the MOSFET that the voltage is lower than 100V. Regards, Teng
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Forum post: RE: BQ76940: Cell Voltage difference with copper column in Battery Pack
Hi Jack, Cell 1 and cell 5 in any group must be used since they have special features. Three cells per group are needed to provide minimum operating voltage. The data sheet is focused on omitting cells 3 and 4 when needed, it does not indicate if cell 2 could be substituted. It might work, we don't know, it is not recommended in the data sheet. If cell 5 input is used for copper it will normally have a 0V drop. With high discharge current VC5 and VC5X may go below VC4 which could cause the cell 5 to show a positive voltage which can go above the UVMINQUAL level and the part sets the UV condition although none of the actual cells are really UV. If cell 6 input is used for copper cell 7 won't be able to balance. I can't think of a method to connect other than the ones shown.
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