Part Number:TL1431-SP
According to MIL-STD-883 SEM is not required for planar die. Does this apply to the 5962R9962001VHA? Or is it non-planar and SEM is required?
Thank you in advance for your help
↧
TL1431-SP: Planar Die?
↧
BQ25890H: when OTG mode active, can we detect when charger is connected?
Part Number:BQ25890H
Hello,
We are using BQ25890H in a product we are developing.
I just discovered that OTG mode is NOT automatically turned off and NOT changed to buck charger mode when a charger is connected to the USB port. Is this like this?
Any way to change this behaviour or detect that a charger has been connected in order to manually (from host MCU) turn off OTG mode and charge battery? (because battery is not charged while OTG is on, and because connecting our boost 5V to charger 5V can cause problems I believe if they do not match exactly.
Thank you very much for your support,
Luis Rodenas
Sistel
↧
↧
BQ25890H: if not using battery temperature sensor, must we put fixed resistor divider in TS?
Part Number:BQ25890H
Hello,
We are using BQ25890H in a product we are developing.
We understand from datasheet (is not very clear this aspect) that if we are not using a temperature sensor with our battery, we must put a resistor divider of 5.23K/10K from REGN to GND, middle to TS.
Is it like this? Not possible to disable temperature function or something like that in order to save those 2 resistors? Seems like a waste...
Thank you very much for your support,
Luis Rodenas
Sistel
↧
TLC5955: Flickering LEDs
Part Number:TLC5955
Hi team,
On operating the TLC5955 there is some unexpected behavior.
To begin with, some outputs generated different brightness for the LEDs, despite the LEDs and all settings (GS, DC, BC) being equal.
Additionally, there was a flicker on the outputs when more than three channels were active simultaneously, even though the GS-settings were ensured to have the same value. Flickering always occurred independent of GS-value
What would be your first advice when troubleshooting?
Kind regards,
Gustaf
↧
TPS92691: About V(CSP-CSN) Threshold vs VCSP spec
Part Number:TPS92691
Hi,
Could you tell me about V(CSP-CSN) Threshold vs VCSP spec?
Customer wants to know V(CSP-CSN) Threshold vs VCSP in the case of VIADJ = 0.14V.
Do you have that graph data?
Or do you know the trend in that case?
Or do you know the trend in that case?
Best Regards,
Yusuke
↧
↧
TPS2559: About Short Circuit Shutoff time
Part Number:TPS2559
Hi,
Could you tell me about short circuit shutoff.
Customer wants to delay the time of short circuit shutoff.
Is there a way to delay short circuit shutoff?
(For example, adding a capacitor to the ILIM pin.)
Please tell me how to delay from 3.5us.
Best Regards,
Yusuke
↧
TPS659037: diiference between design checklist rev A and user guide
Part Number:TPS659037
Hi, I am currently designing a custom board using an AM5749 powered by a TPS6590379. i see a difference between user guide slia088 (september 2015) and design checklist rev A.
regarding I2C, it is specified to connect I2C2, when unused, to I2C1 or to VIO in the user guide and leave it floating in the design checklist. what is the correct connexion? is there a risk to for the PMIC, to be damaged or not functionning if not properly connected?
thank you in advance for your answer.
Olivier
↧
LM5145: About High side FET and Low side FET
Part Number:LM5145
Hi,
Could you tell me about LM5145EVM-HD?
This evaluation board uses different kinds of Q1 and Q2.
Please tell me the reason.
Customers want to refer to the reason for designing.
Best Regards,
Yusuke
↧
CSD13202Q2: looking for RDSon @ VGS = 1.5V
Part Number:CSD13202Q2
hi all,
do we have characterization data of RDSon at such low VGS? at room temperature is enough (max value is more welcome than typ.)
or an pretty reliable equation to estimate it in case?
thanks a lot in advance
KR
vincenzo
↧
↧
TPS2115A: What is the storage temperature range?
Part Number:TPS2115A
I notice in the Revision history that the storage temperature ratings have been removed from the absolute maximum ratings table.
What are the storage temperature ratings?
Thanks,
Craig
↧
TLC5940: Programming flow chart versus datasheet
Part Number:TLC5940
Is the programming flowchart for this device that can be downloaded on the TI website still relevant? It doesn't seem to match up with what the datasheet for the part suggests. I am more concerned about the LOD Status Check. I have the Grayscale and DOT correction working correctly.
Thanks for the help!
↧
TPS2085: Need a better (Smaller) Pckage of this device
Part Number:TPS2085
Hi Folks,
Is there a Smaller Package of this device?
The device electrical specifications are fine, It is somewhat too big for our application.
Help....
Very Respectfully,
Ephi Rubin
Sr Hardware Engineer
Tetracore Inc.
↧
TPS776: Thermal Resistances
↧
↧
BQ40Z50-R2: CD Permanent Fail
Part Number:BQ40Z50-R2
Hello,
I have a few questions regarding the 'permanent fail' features of this gauge, using Charge Degradation as an example but there are a few.
A sudden power shutdown might be a big issue for some applications. So we need to make sure this will not happen. If the 'Trip' condition is satisfied in the middle of a discharge session (product in use), will the battery be disabled immediately?
Is there anyway to prevent power shutdown during use? (Besides disabling this feature altogether of course.)
Thank you!
Regards,
Ryan B.
↧
CSD13381F4: Mostfet
Part Number:CSD13381F4
Hello,
i have a question about the mostfet used in TIDA-00449 for cell ballancing. So as this mosfet are very small and i can not solder it per hand can tell me which other mostfet with Vgs_th small and small rds and which and easilly solder.
Tanks
Oscar
↧
BQ40Z50: Chemical fuse source / US distributor
Part Number:BQ40Z50
Is there an updated source or sources for the chemical fuse used with gas gauges or is the only source still Dexerials in Japan? Is there a US distributor?
↧
TLC59116: 5V supply implementation
Part Number:TLC59116
Team, my customer uses TLC59116 in their products, implemented per figure 21, page 28 of the datasheet - "typical application".
A new program they have requires external 5V supply. They are looking to drive the LEDs directly from the output pins to the ground. They don't see any changes required to the IC circuit, just the LEDs have to be rewired.
Can you please confirm?
Thanks
Viktorija
↧
↧
BQ24085: Timeout resistor from TMR pin to GND
Part Number:BQ24085
According to the BQ2408x datasheet, in section 7.3 the recommended operating conditions, the safety timer program resistor is limited from 33 to 100 kohms. this makes the timeout from 3.3 to 10 hours.
Can we safely use a 20 kohm resistor for a 2 hour timeout?
thanks,
Terry
↧
TPS65070: TPS65070
Part Number:TPS65070
I am using TPS65070 as PMIC for OMAP L138. In my case I do not need battery or USB. The only power source is through AC pin. Also I dont have external Push button to start power sequence. My questions are following
How should USB pin and BAT1 and BAT2 pins should be connected?
How TS pin should be connected
↧
TPS43061: Subharmonic oscillations and inductor overheating
Part Number:TPS43061
Dear All,
I have built a DC/DC converter based on the TPS43061 chip. The circuit was calculated by the WEBENCH tool from the following requirements: Vin=8..16V, Vout=24V, Iout=2.3A, other settings default.
When testing the circuit, I found out that there are significant subharmonic oscillations at medium load (tested with 20 Ohm). Furthermore, the 4.7uH inductor recommended by the WEBENCH software (XAL6060-472ME by Coilcraft) heats significantly, raising concerns that it would overheat at full load. I checked the datasheet for the inductor but found that it is actually well dimensioned for the job (Isat=10.5A, Irms=8A with 20°C temperature rise). The efficiency of the converter drops below 90% when the input voltage is lowered below 15V.
Having thought that the inductor might be going into saturation, I raised the current sense resistor by a factor of 2. This did not improve things and the output voltage started to droop when the input voltage below certain level, which suggests that the inductor current is being limited.
By looking at the switching node, I found out that the regulator does not always operate in CCM. Instead, there are instances of inductor current dropping to zero clearly visible. The output voltage exhibits significant oscillations at about 1/10 of the switching frequency, depending on input voltage. With 10V input and 20 Ohm load, the observed magnitude of the oscillation was 5Vpp.
Another circuit I've built using the same chip with Vout=18..23V, Iout=3.3A but without the extra LC output filter behaves similarly (subharmonic oscillations, inductor overheating at medium loads).
My hypothesis is that the subharmonic oscillations (aka current mode instability) leads to the inductor current slowly wander between zero and the maximum set by the current sense resistor. This leads to significant Irms heating and possibly intermittent saturation. Also the inductor is heavily underutilized with respect to average current.
The question is, what would you recommend as the best course of actions? I see 3 possible reasons of the problem:
1) My board layout could be suboptimal. I used 2 layers. Even though I generally followed the recommended board layout, there are deviations in the connection of digital and analog grounds.
2) Regulator compensation network (Rcomp, Ccomp, Ccomp2) may have to be tweaked. Could anyone suggest a good starting point in compensation network tweaking?
3) The inductor may have been suboptimally selected by the WEBENCH tool. I may need a larger inductor and/or a lower switching frequency (currently ~500kHz).
Any help with the explanation or suggested course of action is highly appreciated. If anyone sees a flaw in my circuit or board layout, would be really helpful too.
↧