Part Number:LP8863-Q1
Hello Sir,
I would like to confirm below voltage 1 and voltage 2
Conditions:
Boost Voltage set to 12V
ILED0~ILED5 connect together to get 900mA
LED is 3S1P .
I can see voltage 1 around 4V and voltage 2 around 3.5V .
- May I know V1 follow LED qty per string to change ? No concern on LED current ,right ?
- What conditions will influence V2 , why its 3.5V ?
Many thanks !
Hello, I'm searching for a power variable resistor. It must vary in range 0 - 0,6 Ohm and must be capable to bring a current up to 8 Amp. OK for passive resistance but I'm asking if exist an active component like power mosfet with which you can do this. It is important that Mosfet source is not connected to the ground but is floating. The Mosfet gate could be driven with a logic ciruit. I'm not able to find in TI website an IC with this skills. Please, could you help me to find this component?
Thanks!
Ettore.
Part Number:REF3225-EP
Does the output voltage range specified on page 4 of the part datasheet apply over the full temperature range (-55C to +125C)? It states "boldface limits apply over the listed temperature range", is this indicating that all of the limits in this table apply over the full temp range? I do not see any values specifically boldfaced.
Part Number:UCC256304
Hi,
My customers have some question on UCC25630 on 800V application:
They need add transform isolation between HS and MOS mid-point, is this feasible, any issue on this approach?
Could add external MOS driver to increase driving current ability during HV application?
In addition to above question, and:
What's the constant frequency during burst mode?
For 100Hz line frequency ripple, UCC25630 should have advantage on the Io ripple suppression? customer's target is 100Hz Io ripple<2%.
Thanks!
Part Number:BQ34Z100-G1
Good morning,
we are going to use a battery pack equipped with the BQ34Z100-G1 for a good SOC estimation into a solar luminaire.
In such an application the battery pack is continuously charged and discharged: during day time it is important to maximize the energy collection from the sun through a solar panel for charging the battery, while during the nigh time it is important to guarantee a proper light intensity in the area where the system has bee installed.
So normally there are no relaxation intervals available for the battery because immediately after the sunset the charging phase is disable and light is switched on, while immediately after the sunrise, the charging is enable and light switched off. How the impedance track algorithm can work under such situation?
just in case it would be necessary, we can find a way for leaving the battery pack to relax for a short time. So we would like to ask if that could be necessary/useful and, just in case, which characteristics the relaxation period should have (and some indications about how to set related parameters in BQ34Z100-G1).
Thank you in advance for any suggestion and best regards
Matteo
Part Number:BQ24090
Dear Forum,
we would load an Li-accu with the BQ24090.
The issu is that there is a Schottky-Diode before the positive pin of the accu. So we can connect the output of the BQ24090 only to the diode with an voltage drop of about 300..450mV and not directly to the accu.
Can someone give us an advice if this is a problem for the BQ24090 and how to solve this?
Best regardes
Matthias Geiger
Part Number:BQ76PL455A-Q1
In this period it is difficult to retrieve the part BQ76PL455A-Q1 on e-resellers. Market demand for this product has caused an extension in lead times.
Is this a problem that will be solved in the future?
Thanks for the attention,
best regard,
Carlo.
Part Number:TPS60403
TPS60403 is used in my design to get -5.5V power supply to analog circuits from a 5.5V dcdc output. normally about 15mA current output. I followed the recommended design in the spec.
This charge pump has burned twice so far. The first time was when I was doing some test, no touch at all on PCB and this chip suddenly got burned with a small blast, with smoke coming out.
The 2nd time was one of my customers playing this product (SW engineer, probably know nothing about hw) and touched 60403, and it got burned, as he described.
I wonder if it is an ESD issue? or because of over heat problem or anything else? I cannot repeat the phenomenon at the moment. Any clue of this kind of problem?
thank you in advance
Part Number:BQ34Z100EVM
Hello,
I'm currently working with the BQ34Z100EVM, EV2300 and the latest BqStudioversion (1.3.86.3). During a charge or a discharge of my cells ( 10 serie cells, chemID 1737), the voltage (and the SOC) are turning complety wrong. For example the voltage jumps from 34630 mV to 65375mV, the wrong value stays for 1 second and then it turns to the correct value again. It also happens sometimes that the device lost connection for a second during a discharge/charge, I dont know if these two problems are related too each other but the Voltage rise happens much more often. I'm happy about any help to solve the problem. I attach a log and gg file.
Thanks
(Please visit the site to view this file)
Part Number:TPS2660
Hi Team,
I have a need to use the TPS26600 on a 24V power supply with the current limit set to 1.5 Amps. The downstream load that is connected enters a known high current spike 4 seconds after powered on.The load goes up to 1.8 Amps at 4 seconds after power up and then drops down to normal operation within 1 second.
I would like to use the TPS26600 so that the current limit is at 1.5 Amps. I need to adjust for a short period of time to allow the 1.8 Amp load to pass.
Do you all have a method to do so? Switching in a second ILIM resistor? Using a digital potentiometer? Using a DAC into ILIM?
Let me know your thoughts!
Thanks,
Part Number:TLV62085
Hello Experts,
I am viewing a rare oscillation in SW pin of the TLV62085. Perhaps it is a normal operation due to the mode of operation, but I put below the schematic and oscilloscope to confirm properly operation.
My question is:
¿Is my circuit runs properly?
If it run properly, ¿what is the reason to this oscillation?
Thanks
Part Number:BQ76940
Hello,
We are about to produce a battery managed by a BQ7694001DBT circuit.
We know that the BQ needs an ageing cycle (Full Charge / Full discharge) to calibrate its SOC (State of charge).
it is not possible to perform this cycle for each produced battery during the production because it is too long, and costly.
Is it possible to perform this cycle on a "golden" battery and to retrieve the calibration parameters (golden image) from the BQ on this battry, then to flash this golden image all produced batteries ?
Thanks for your answer,
David Duminy
Part Number:TPS40428
Hi Team,
My customer is looking at implementing the TPS40428 for a 60A 1V design.
They have tested out the TPS40428 EVM with the CSD95378BQ5M and are seeing that the current calibration is not very accurate (going through TI Fusion GUI). For instance, they are seeing at the bottom range a current of 1.5A going through the system, when 0A is reported.
I do see an Iout cal offset in the Fusion GUI, is this recommended to use? Do we have any collateral on best practices for this?
At the top range, (over 30A) - would accuracy be in the range of +/- 3%?
Thank you!
Regards,
~John
Part Number:BQ28Z610
Hi,
I am wondering if the calculation below to calculate the Balance Time is correct.
If I use the Resistors on the Eval Board (100R and 105R) the I get a Balance time of approx. 16000 s/mAh per cell. This is assuming a duty cycle of 66% but there is nothing mentioned where this value comes from.
Please confirm that this is correct. if so, is there a way to speed the process up?
Thanks,
Fred
Part Number:UCD9246
The library manager inside Fusion Digital Power Designer allows entry of the tolerance for the output capacitors.
How is this tolerance factored into the calculation of the compensation coefficients?
I've reviewed SLUU490 and the loop compensation chapter, but I'm not sure which value for "C" is being used: min,max, or typ?
In FDPD, if I first "Autotune" the compensation, then switch to "Manual" mode and change the output capacitance and see some change.
Is there a better way to hold the compensation constant and verify the stability of the regulator over output capacitor tolerance?
Thanks, Best, Steve
