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TPS61258: Can it support Vin>Vout condition?
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TPS53819A: EN_UVLO logic level
Part Number:TPS53819A
I am using TPS53819A in my design to generate voltage as below. I generated the schematic using TI Webench. I want to control the EN pin from controller. Controller output is 3.3V CMOS.
Vin: 12VDC
Vout: 0.9V
EN: 3.3V CMOS from Controller
Will the above configuration work?
Regards,
Kiran
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UCC28740: UCC28740 External OTP circuit
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Power Over Fiber
Team,
Do we have any solutions/roadmap for Power Over Fiber like PoE?
Thanks.
Allan
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TPS56C215EVM-762: Vout oscillation
Part Number:TPS56C215EVM-762
We used TPS56C215EVM-762 supplied by 12V Vin and output 5V @ 2.41A max. Switching node is shown using purple. Vout waveform is shown using light blue.
There is no switching node ringing but we still measured oscillation on Vout.
Here is setup for measurement.
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BQ27542-G1: BQ27542-G1: Charging current limit.
Part Number:BQ27542-G1
Hi admin,
I am using a battery fuel gauge (BQ27542-G1) and battery charger (BQ24295) for my battery charging and monitoring application.
What I am concerning is the different charging current for different kinds of battery, when I use same charging configuration in battery charger chip.
My question is that does the fuel gauge have some kinds of parameter or algorithm to control the limit of charging current for battery? I have checked in data sheet and manual of the gauge but nothing is mentioned.
Thank you.!
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UCC25630-1EVM-291: Lr, Cr value
Part Number:UCC25630-1EVM-291
UCC256301EVM has 50uH L1 and 0.022uF C8.
I think these are Lr and Cr of the datasheet or Excel Calculator.
When we input design requirements value of datasheet into excel design calculator, excel tool result match with datasheet contents.
However we cannot design with excel tool when 50uH Lr and 0.022uF Cr are used like EVM.
How did you decide EVM components value? Is there any other calculation method?
Best Regards,
Kohei Sasaki
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BQ40Z50 firmware
Dear TI staff,
I have a question regarding one of TI's gas gauge, BQ40Z50
What is the difference between firmware version R1 and R3?
If possible, can you provide a list of changes ?
Thank you
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TPS54360: Heat problem during operation
Part Number:TPS54360
Dear TI,
There is a heating problem during the board test.
-. Test Spec
1. DC Input : 28V
2. Output : 5V
-. Schematic
-. Current, switching waveform
Is there a problem?
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BQ25700A: USB charger failed with some PC
Part Number:BQ25700A
Dear TI Sir
My product uses BQ25700A
The product is connected to PC for charging. Some PCs do not recognize the device and cause the device to be unable to charge.
I check REG_20
PC Non-Recognition Device : BQ2570X_REG_20[20]= a000
PC Recognition Device : BQ2570X_REG_20[20]= 2000
Please help to check this problem.
(Please visit the site to view this file)
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TPS7A47: Turn on time and rise time
Part Number:TPS7A47
Hi,
The device used is TPS7A4700RGWR.
I try to check on the datasheet but could not find clear specification (min/typ/max) on the start up time from EN pin meeting the rising threshold to regulator start output.
In addition, what is the specification (min/typ/max) on the rise time of the output, based on 3.3V output config, output capacitor 47uF + 0.1uF and 1uF at NR pin?
Please help to advice. Thanks!
Regards,
Teoh
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LM5022: 9~36V to 51V
Part Number:LM5022
Hi Sir
May I know below TI design can support 9~36Vin ?
If not ,how could I modify that can support 9~36Vin
Thanks
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LM5069: why we need to add dv/dt start-up circuit for LM5069, while no such circuit for LM5064
Part Number:LM5069
Hi,
Our design used LM5069 to control power amplify OCP issue; the target limit current is 10A or so;
And dv/dt start-up circuit was added for LM5069; but related engineer is not sure why we need this, just said this was recommended by TI;
I recall there was no such circuit for LM5064 before;
design parameters refer to figure 27 of LM5069 datasheet:
Cin: 1uF, Cout is about 190uF, RPWR: 26.7K, Ctimer: 1nF, Cdv/dt is 22nF; Rsns: 5mohm; Q1: PSMN4R8-100BSE; there is no diode at input or output side; and there is 100K between Vout and OUT pin;
when we test the circuit with 10us width and 100us cycle current brust, which amplitude was from 0A to 5A(which is below OCP limit);
We found out Vgs shall ramp down from 12V to 4V and we can see Vds as 20V;
primary analysis from my side is the discharge current is large than charge current in Cdv/dt; and cause Vgs issue.
So question to TI:
1) why we need circuit as dv/dt start-up, is this necessary? without such circuit, we shall have what kind of performance loss?
2) can we calculate out the charge time(16uA) to balance the related large discharge current?
BR.
Bin
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TPS65023: Suggested connection for pin not used
Part Number:TPS65023
Hi Team,
What is the connection suggestion for pin LOWBAT_SNS and PWRFAIL_SNS if the corresponding function is not used? If they are pulled up to 5V or tied to ground, is there any other influence? Thank you.
Regards,
Hongjia
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TPS65311-Q1: Number of effective digit of Boltzmann constant
Part Number:TPS65311-Q1
Hi,
When TI calculates FIT rate of the TPS65311-Q1, how many digit is effective digit of Boltzmann constant?
Best Regards,
Kuramochi
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UCC28880: 24V 150W ACDC - current limiting solution
Part Number:UCC28880
I have a 24V output 150W AC/DC feeding two circuits each of which can be limited to well under 96W and am looking for a current limiting solution to help me meet UL Class 2 power limits. Can you recommend anything that has been UL certified to the appropriate standards? Thank you!
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LM5141-Q1: LM5141-Q1 EVM, how to select D1 and D2
Part Number:LM5141-Q1
Dear TI:
How to select the D1 and D2? The schematic is from LM5141EVM, my application is 12V->5V/10A:
I want to select D1 and D2, Which parameters do I need to focus on?
Thanks!
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LM2941C: ABX Max Voltage of OUT-pin
Part Number:LM2941C
Hi Power Management team,
Could you let me know ABS Max voltage of OUT(5pin) of LM2941CSX/NOPB?
Best regards,
Satoshi
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TPS63070: TPS63070
Part Number:TPS63070
Hi
I am using the TPS63070 IC in one of my design for output of 8 V and Load current of 2A ,
The design is working fine but while checking Load (or) output current with adjustable Resistive Load till 600mA while turning on Power supply is working fine but after that when I am reducing the resistive load for >600mA before turning ON , the current is dropping to 150mA approx. after turning ON supply
In case if I am connecting and adjusting/ varying the load after turning ON power supply then I can measure up to 2A with out any issue , Can you confirm whether it is the limitation of start-up current? Even in datasheet pg 21 shows the typical start-up current limitation for 8V o/p is around 750mA , and I tried by connecting high Value of capacitors at I/p and o/p up to 100uf , however there is no improvement, Can you check and do the needful?
Thanks,
Praveen
Mob:9902401702
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BQ27530EVM: Can't limit the average current flow during charging of battery through BQ27530 EVM
Part Number:BQ27530EVM
Hi,
Currently i am using BQ27530EVM (which comes with both BQ27530 fuel gauge and BQ24161 charger). As per my current requirement, i need to limit the average current during charging of battery. For evaluation purpose, i am using BQ STUDIO.
I have limited the programmable charging current using the data flash of fuel gauge. Also based on that, battery charger registers are configured. But still i am not able change or limit the average current during charging of battery.
Is i am missing something or is there another was to limit the average current flow ?
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