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BQ76940: BQ78350+bq76940+bq76200+12S,fail to set the charge current
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BQ76940: Please help me check the schematic, concerning bq76940
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BQ24155: bq24155 will this part supply power to the load when the battery is disconnected?
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TPS2549-Q1: control pin configuration with microcontroller
Part Number:TPS2549-Q1
Hi,
I would like to know if I can use microcontroller to control the CTLx pins instead of hardwire them?
I want to configure this device in such a way that it has the flexiblity to detect the plugging device
For example, when user plug in USB flash drive for playback purpose , the DP_out and DM_out will tell the MCU to set the CTLx to CDP/SDP
whereas when it require to charge with 2.1A, MCU will configure it to DCP and stop transmitting data
Is this device capable to do so?
Thanks
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LM5121: LM5121 Inrush current limit program#2
Part Number:LM5121
Now I use LM5121 for boost input from 10.5V - 14.5V to output 24V Pout 200W and i set OCP Point by RSENSE Current = 3mohm.
but i found gate drive dissconnect switch input MOSFET cannot turn off. when converter shut down OCP affect to input voltage bypass to output.
and i have improved this issue by add Inrush Current Limit Programming #2 (R_Inrush = 10Kohm). I have some question about this circuit as below.
1. Resistor bias transistor is RSLOPE? (Original i use RSLOPE = 100Kohm connect to GND @ freq 150KHz ).
2. How to calculate Resistor bias transistor?
Best regards
Watchaphong
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TPS61080: The output -15 ripple is large
Part Number:TPS61080
Daer all:
5V input power, output plus or minus 15.The output waveform of -15 was measured by oscilloscope, and the ripple was very large.What's the reason for this?How to solve
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BQ25601: Can left PSEL pin float?
Part Number:BQ25601
Dear Expert
My customer meet some charge problem in low battery mode and need to charge design PSEL from pull high 500mA to pull low 2A when plug in VBUS.
But this project status is near MP stage and can't add pull low resister on PSEL pin.
So, can we left PSEL pin float and let it be 2A mode?
I had test EVM and it seems always 2A when I float PSEL pin.
Thanks for judge and help !
BR
Bruce
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BQ27421EVM-G1A: FC bit not getting Set even when the battery SOC reaches 100%
Part Number:BQ27421EVM-G1A
Hi,
I'm testing with BQ27421-G1A EVM using my 450mAH Battery. After programming Design Capacity to 450mAh, Design Energy to 1665mWh, Termination Volatge to 3100mV and Taper Rate to 100, charged the battery to Full. Observed that Battery Voltage is 4190mV < VBat < 4200mV & SOC is showing 100% in the Gauge GUI but FC bit is not Set. I repeated this 1-2 more times with the same battery & with another battery also, FC was never Set. Let me know what is the reason for not setting of FC bit.
Also let me know how gauge knows when the battery is fully charged. Will it decide based on SOC alone or FC bit or both ?
Also can you help me how I can test the accuracy of the SOC reported by the battery using this BQ27421-G1A EVM ?
Thanks
Kunala Vidyasagar
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24VAC LED driver
I need help in establishing the right part/s /solution to design a 24VAC Buck-Boost LED driver with THD<10, PFC>0.90 and Eff > 85%. Output is an LED array with 20V-25V / 80W and 20V-25V / 150W.
Input - 24VAC / 50Hz
Output - 20V-25V 80W and 20V-25V 150W
Please advise in the matter.
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BQ34Z100: the problem about bq34z100-g1 design
Part Number:BQ34Z100
As you see pic above ，the gauge it use is BQ3060 on the narrow PCB，but TI official website said BQ3060 is not suitable for new design，now i want to use bq34z100-g1 to realize my design. The attached pdf is my design which used by My colleague ，but he says that PC can not write anything to bq34z100-g1 through IIC，so Can you help me see what is wrong with the circuit design? In addition, if I want to configure bq34z100-g1,which parameters should I need to know ？
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ISO5852SDWEVM-017: the isolated power rating for gate driver
Part Number:ISO5852SDWEVM-017
Hi,
In ISO5852SDWEVM-017, the isolated power for gate driver is generated through SN6505, in SN6505 datasheet, its output drive is only 5V 1A.
So I think the power generated can only be less than 5W?
But the source and sink current in the reference design is 20A? Gate drive voltage could be 12V & -5V.
with 12V, 20A, the power rating is 240W!
I know 240W is not constant power, but how do we know whether the 5W SN6505 can handle 240W transient power consumption?
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TPS65218D0: PMIC TPS65218D0
Part Number:TPS65218D0
Sir,
we use TPS65218D0 for supplying power on board. The default power sequencing is LDO1(1.8V)->DCDC3(1.35V)->DCDC4(3.3V)->DCDC1(1.1V)->DCDC2(1.1V) based on register 0x25, 0x23, 0x22, which is same as our test result.
We actly want power sequencing is DCDC4->LDO1->DCDC3->DCDC1->DCDC2(1.325V), we change the register value from I2C like this: Reg_0X23=0x37, Reg_0x25=0x65,Reg_0x17=0xAF. But it seems no effect.
we surely think the reg value was changed correctly. because we write the value to che Reg, then we read it from I2C, the value was what we have written.
then we test DCDC2 output, but it's still 1.1V.
and after re-power, we found the register value is still default value. Why? How can i change the default output and power sequencing?
for example, changing the DCDC2 output, we write the register like this:
write 0x6A to 0x10, where 0x6A is 0x17 xor with 0x7D
write 0xAF to 0x17
and the chipID register(0x0) is 0x5
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UCC24612: UCC24612 work in Active clamp forward SR
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TPS62120: TPS62120 stability with low impedance feedback divider
Part Number:TPS62120
Good day Colleagues,
Could you tell me, how to calculate Cff value for low impedance feedback divider? Datasheet examples used for calculations very high resistors (about 500kOhm).
While my customer is using 10k and 2k resistors to get better noise (EMI) stability. Output voltage is 3.6V and output is ceramic capacitor 20uF (load is 20mA).
What is an optimum Cff value for this capacitance and feedback divider?
Thank you, Mike
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TPS23754: Bias Voltage Generation and Active Clamp FET Selection
Part Number:TPS23754
Hi team,
I have two questions relating to the TPS23754.
Firstly, the controller has an extra gate that controls the MOSFET for the damping of the primary winding (active clamp). However, I can’t find anything on the requirements for that MOSFET.
Secondly, to generate the bias voltage (Vc), I see two flavors in the datasheet (see figures below):
- · One diode
- · Two diodes and an inductor.
Why are there two variants and what are the rationale for choosing one over the other?
Kind regards,
Gustaf
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GPC ChemID report has no contents
Hello TI Community!
First of all, I'm new here, and inexperienced with the TI Battery Fuel Guage and the Gauging Parameter Calculator. I submitted a dataset to the Gauging Parameter Calculator, as to find the ChemID of a new cell we are going to use. To do this I followed the steps in slva725a.pdf.
The data I uploaded:
(Please visit the site to view this file)
When receiving the GPC report, I get the following files in return:
(Please visit the site to view this file)
The file GPC_report.txt only contains the following lines:
0 0 0
Warning: voltage in V detected divider changed to 1 0
Warning: current in A detected divider changed to 1 0
What does this mean? It doesn't give an error, so I think the file formatting is good, but it somehow also doesn't give a matching ChemID. What can be the cause of this 'empty' report
Thanks in advance!
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BQ2962: REG pin of 0.47uF capacitor
Part Number:BQ2962
Hi ,
If customer selects bq2962xy series device but REG pin not be used, can we remove the 0.47uF of capacitor that places between REG to VSS?
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TPS54202: Questions for TPS54202 EN Pin Voltage Hysteresis Range
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TPS2003C: safety document for TPS2003C UL-60950-1
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TPS59641: Device design resource required (datasheet, schematic , application notes)
Part Number:TPS59641
Support, please tell me how do i get the device datasheets, schematics and application notes. The datasheet you have provided on web is asking to sign CNDA with intel. how do i get the its format from intel. I already had a NDA with intel. To whome i have to send the request in intel. Kindly suggest.
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