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TPS22904: TPS22904 and TPS22902B pin compatibility
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BQSTUDIO: Battery Characterization
Part Number:BQSTUDIO
Hi,
I have a Lithium Ion battery and I am planning to use BqStudio to find out the ChemID in order to either pick a ROM type gauge (if the deviation is less than 3%) or go with a Flash type. I have read the technical documents and the forum but I still have the following questions:
- It looks like the process would take around 20 hours to generate the data because of the timing requirements. I was wondering if we need to exactly follow the required time for relaxation? Can it be more than 2 hours (SLVA725A - step 3.1.3) and/or more than 5 (SLVA725A - step 3.1.5). The company is not normally open 24 hours...
- I saw in the forum that it can be possible to find the CHEMID for a battery without actually performing the testing. Do you have a database where I can check if this battery is there?
Thanks.
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TPS24751: XOR two devices
Part Number:TPS24751
I'm trying to 'or' two TPS24751 where if first one has a valid source voltage applied, the second one is shut down. I have the first one's PG# connected to EN pin of second device. After I applied a valid source voltage to first device and an open source on second device, the second device slowly burned itself up, literally with a blackened board around its VCC pin. What is the correct way to 'OR' these two? [ FYI when the TPS65990 is no longer preliminary I intend to replace just the second device. My intent is to have one USB C source and one optional wall/car adapter to run/charge my device. The output to the right feeds 50uF of ceramic caps and a BQ257503 ]
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TL431LI: PKG option
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BQ27GDK000EVM: GDK general questions
Part Number:BQ27GDK000EVM
Hello,
I am looking into the GDK as a solution for the calculation of the CHEMId for my Lithium Ion Battery (Charging Voltage = 4.2 V). This tool is great because compared to using a EV2400 we can control the charger and load using a script from bqStudio. This means, after everything is setup, we can leave the characterization running.
After looking at the documentation, I have the following questions:
1- In my device, I am planning to use a BQ24232 (linear charger) and this GDK has a switched mode charger. Would using the charger provided by GDK make a difference in the estimation of CHEMID? I mean, differences regarding accuracy compared to when the battery is in our device. I would say this can be solved with a learning cycle in the device but I am not sure.
2- How is it normally used to measure the temperature of the battery for the CHEMID? Does the battery need to be placed in a specific position in order to use the internal sensor of the on board gauge? I think I would be ok with using the internal gauge but I would like the temperature reading to be accurate enough for GPCCHEM.
3- The battery has an NTC so I thought I could also use the bq27520evm (has an NTC pin) and connect it to the GDK. By the way, if I can not use a ROM based gauge, I would use this gauge. One thing I did not understand for this gauge is figure 6 of SLUU426B. Do I need a 3.6V power supply or is the figure wrong?
4- Should I calibrate the gauge before doing the characterization of the battery?
Thanks for your help!
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TPS25910: About Back-to-Back (B2B) FET Operation
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UCC21521: sink current when EN=Low
Part Number:UCC21521
Hi team,
when EN=low, how much the sink current of the output stage is?
Regards
Robin Liu
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WEBENCH® Tools/LM5005: Can lm5005 be simulated with Vin=24V, Vout=-16V, Iout=0.5A by WEBENCH?
Part Number:LM5005
Tool/software: WEBENCH® Design Tools
Hello guys,
One of our customers is considering using LM5005 for their new products. They want to simulate lm5005 by WEBENCH or other any way (TINA-TI or other). Their conditions are Vin=24V, Vout=-16V, Iout=0.5A.
Can lm5005 be simulated with Vin=24V, Vout=-16V, Iout=0.5A by WEBENCH? If it can not be simulated by WEBENCH, could you please tell me how to select external parts and simulate it with the external parts?
Your reply would be much appreciated.
Best regards,
Kazuya Nakai.
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TPS2378: Change from adapter to PoE power source of TPS2378
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TPS53681: May TPS53681 Vout can up to 3.3Vout?
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Power solution recommendation
Hi Team,
My customer has an issue that SMPS has 100mV ripple @5V 1A output. while the load is strict with the power (much lower ripple). my question is that does TI has DC/DC solution with same input and output?
my current solution for the customer is to increase the output of the former SMPS and then use a LDO to get a much quieter power for the load. it's OK?
thanks a lot.
Yang
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BQ24735: Power IC CHIP different code/number? Please help
Part Number:BQ24735
Hi,*
I'm grateful to find such forum and such skilled people.
This might be the stupid thing I've ever asked but I've got to ask to understand.
I've searched myself and I dont believe this will cause any problems.
I've had my laptop defective now for a long time. Today I understood that the charging problem is
from this preticular chip (BQ735) according to the photos I've taken.
When laptop is connected to Power Adapter it does not charge the battery or start up (even if battery is removed).
So the problem is from the chip. That I understand from today.
I've already ordered two types of this chip from both Ti Store and Ebay (TI chips and not some China stuff).
The only thing I dont understand at this moment is... On the photos and the chip it says:
BQ375
TI 5BI (or 58I?) and then A8F3 (A8F8?)
Does this mean anything or is it important for me to find exactly this chip number?
Because I've searched the internet and believe me I've searched in every way possible without finding this number/chip model except for BQ24735 TI and even without the 5BI or 58I or even 58K A8F8 or A8F3 etc...
The items I ordered is BQ24735RGRR and BQ24735RGRT
And I even wonder what is the difference between them both? (Another stupid question)..
Thank you for all your help.
Pictures (shared album, Google Photos): photos.app.goo.gl/GYdZnwJ4jPDCnKj86
Best regards
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UCC28951-Q1: UCC28951-Q1
Part Number:UCC28951-Q1
Hello Sir
how to calculate the resistor value R11 (49.9 ohm) in the page number 57, figure no:56 of datasheet of UCC28951-Q1 datasheet .?
Is there any method to calculate that resistor value .?
or else can we go with any value ?
Thanks and regards
Rajashekar
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BQ25895: How to configure 9V via D+/D- pin?
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TPS65131: TPS65131 Peripheral device selecting
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BQ24170: Minimum input voltage to charge 3.7V battery at 4.2V charge voltage and 2A charge current.
Part Number:BQ24170
Hi,
We are designing a PCB with battery charger IC for 3.7V single cell Li-Polymer battery, Currently We are planning to use BQ24170 battery charger IC in our design.
Let me explain about what is there in our PCB
1.It has a buck regulator at the input side which supports wide range of input voltage ranging from 5V to 24V which gives us the stable 4.5V output.
2.Next this input is provided to the battery charger IC to charge the 3.7V LI-poly battery.
3.The last stage of the PCB is that it has a BOOST regulator that will take 3.7V battery input as well 4.5V from the above buck regulator(this is when the external adaptor is connected) to produce 5V, 3A output power.
Now my concern is that whether 4.5V is sufficient for the battery charger to charge the battery at 4.2V , 2A charge current?
Also suggest what is the minimum input voltage that is required to charge the 3.7Vbattery?
Please suggest we are choosing a buck regulator that provides enough current for the operation.
Request you to reply this ASAP.
Regards,
Karthik
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UCC256304: No use ACIN Wide range input DCDC converter
Part Number:UCC256304
Hi Ben-san,
My customer want to use UCC256304 for Input DC90V-300V to output DC385V 200W isolated DCDC.
UCC256302 or UCC256303 does not meet such a wide range input by BLK voltage range.
How about the HV pin connection to kill the X cap discharge function?
Please propose the cct of Input DC90V-300V to HV pin cct.
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BQ24610: About Inductor selection
Part Number:BQ24610
Dear experts, I use the bq24610 to charge 4-series Li-iron battery. The external DC adapter will select 19V or 24V product. The charging current will set 800mA or 1.5A. The PACK+ voltage will set 16.8V. From TI datasheet, It suggest to use 6.8uH inductor(If charging currrent is 2A). If I change inductor from 6.8uH to 10uH, is it suitable? Does it will cause any defect or fault on system operation? Because I want to increase the inductor value to see the result of EMI radiation. Maybe it wil have improvement to reduce the system EMI. On the other hand, I will reduce external DC Adapter voltage from 24V to 19V to see the EMI field intensity(I already add the snubber and gate resistor, but EMI test is still fail.). Regards.
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Ask 1kW ac to dc solution
Hi sir,
Does Ti have reference design or recommend for the following AC to DC spec
Input :85~264VAC
Output:12VDC (1kW)
PFC+LLC or efficiency need to over 88%
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TPS7A19: input short test issue
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