Part Number:UCC2818
Dear TI experts,
I wanted to understand what is the major difference between UCC2818 and UCC28180 PFC controller?
UCC2818 looks so complex and if UCC28180 looks simple.
Why someone should prefer UCC2818 instead of UCC28180 and what is the advantage of UCC2818 over UCC28180?
Regards
Aneesh
Part Number:TL431
Team,
We have a setup that is close to the one from the below post:
https://e2e.ti.com/support/power-management/f/196/p/663820/2439750#2439750
I can not share the exact schematics online, but I can provide it offline.
The issue is that it seems that the current minimum needed to bias the TL431AI is 3 mA which is much higher than the Imin (minimum cathode current for regulation - see datasheet SLVS543P page 10) max value of 0.7mA.
What could be the reason?
Thanks in advance,
A.
Part Number:TPS25982
Hi,
I am using tps25982 as a eFuse in my design. I want to use 2 IC's in parallel mode to limit current (nearly 20 Amps) to my load as per the link http://www.ti.com/lit/an/slva836/slva836.pdf
Does this part support parallel mode of operation for a 20 Amps of load ? If yes please suggest me how to connect?
Currently i am planning to use it as per the below mentioned schematic. Please check it and correct me with RILIM resistor value.
I am providing a input voltage Vin=12 Vdc. Ilim=20A.
Part Number:TPS61021A
Hello,
I'm having trouble finding the difference between TPS61021DSGT and TPS61021ADSGT. Could someone explain or point out something I missed in the datasheet?
Thank you,
-Kyle
Part Number:TPS61175
Team
My customer is looking for a 14V input, isolated 48V output (max 15.4W) boost converter.
There is TPS61175PWPR (~ 18V input, ~ 40V output) and it was written that the flyback can be supported
in datasheet.
Even if it is IC of rated output 40V, if it is flyback method,
is it possible to make 48V output on the secondary side of the transformer with TPS61175?
Thanks
Best regards,
Shidara
Part Number:BQ2012
Dear friends
I need help. I am using bq2012 in my project (6 NIMH cells in serial). The defect rate is up to 5% in mass production. All the defect are related to BQ2012. BQ2012 damaged so easily.
Some symptom :
1) High quiescent current. Normally, the quiescent current is around 0.12mA. but some show 1.6mA.
2) Incorrect initial LCM data. It doesn’t resume to correct initial LCM after reset. Even cut off the power and connect again. No correct initial LCM value appear.
3) BQ2012 have no function. I measured the quiescent lower than normal , it is only 0.018mA ( normally, it 0.12mA).
4) Normally, the charge pin should be low when the battery is not fully charged. But low state never appear even fully discharged.
Schematic for reference. The bq2012 is powered by 3.3V regulator.
Thanks
zeng
Part Number:EV2300
Hi,
i already asked the question about updating the firmware on my EV2300 (communication with BQ40Z60).
We purchased the EV2400. I downloaded several Update SW but till now i could not update my EV2300.
For example i used the following SW and it finished with the message (-1 something like not enough EV2300 connected; that is clear to me because my Controller is the EV2400)
Is there any new SW that handles this problem? Is it even possible to update the EV2300 with the EV2400?
I hope for an answer.
Best regards
Patrick
Part Number:UC1843A-EP
Hello,
I am searching the RTHJCBOT = thermal resistance Junction to case bottom value for UC1843AMDREP. Can you help me?
thanks and best regards
Florian
Part Number:LM3409HV
Dear TI :
My cusomer used LM3409HV for PWM dimming lighting design, when they do EMI test, the RE is a little over the limit.
Customers try many methods to optimize EMI, then they found that the string beads at the Source of PMOS could reduce EMI, but the Gate waveform would be abnormal.
Can you give some advice for optimize EMI?
The data of EMI before string beat:
The data of EMI after string beat:
The gate pin waveform before string beat:
The gate pin waveform after string beat:
I will update the schmatic and PCB layout in the reply.
Regards!
Eric
Part Number:BQ20Z655-R1
I am trying to understand how the State of Health (0x4F) is calculated. Is there an app note that describes this? If not, could you please provide the formula.
Thank you,
-Justin
Part Number:TPS51225
Customer is asking for Orcad schematics and Allegro board files for the TPS51225EVM. Thanks.
Part Number:BQ20Z655-R1
BACKGROUND:
I am designing a product that uses a battery pack with this IC in it.
This products application is such that it is not likely to meet the automatic Qmax update criteria.
Because of this i am making a special mode for the product to run the battery pack through a Qmax update profile as needed.
A profile without any intelligence would for instance charge the pack to 100%, wait 5-6 hours, discharge to near empty, wait 5-6 hours and then ideally the calibration flag would be reset. This unintelligent profile takes up to 24 hours to perform in my application.
GOAL:
I would like to be able to have this Qmax update profile ran with intelligence in order to minimize the downtime of the product when a Qmax update profile is ran.
By intelligence, what i mean is to have trigger points to know when to start discharging/charging the pack to take the second OCV reading.
For example: Query the pack to know when the first Qmax update OCV reading has been performed then discharge the battery, query the battery again until the second Qmax update OCV reading is taken and confirm that the Cal Flag has been reset.
QUESTION:
I see that the VOK and QEN are related to the Qmax update, but both slua364b and sluu493 are not explicitly clear on what these status bits mean.
Could you provide a clearer description of when these are set/reset and how that relates to the Qmax update?
As it relates to the above example, would either VOK or QEN be good status bits to query to know when a Qmax Update OCV reading has been completed?
-Justin
Part Number:BQ20Z655-R1
In sluu493a section 2.4.3.2 it says that a voltage in the range of 3737 to 3800mV for default LION chemistry disqualifies a Qmax update.
What parameter(s) in flash set these voltage ranges? If it is not a direct parameter, how are these voltages determined?
-Justin
Part Number:BQ20Z655-R1
In sluu493a section 2.4.3.2 it says that if 5 hours has exceeded a OCV reading is taken even if the dV/dt condition is not satisified.
I don't see any timing tolerances/accuracy in the parts datasheet. What should i expect for the accuracy of this 5 hour timer?
-Justin
Part Number:LM3478
Hi,
my customer designed a schematic as below:
the feedback circuit is:
They find that:
1. At 150kHz frequency, the PWM will oscillate as below: (yellow- DR pin, green- COMP pin). The oscillating frequency is about 760Hz.
2. adjusting RC at the feedback circuit won't help.
Are there anything wrong with this circuit?
Part Number:TPS55160-Q1
Hi Team,
My customer wants to know how long (time) our part needs, in the spread spectrum mode, from the lowest frequency (1800kHz) to the highest frequency (2400kHz) in µs.
Thanks for your support
Martin
Part Number:BQ34110
Hi,
I'm using the ALERT2 pin as a signal image of BATLOW (and the ALERT1 pin as direct charge pin control).
As the state is latched on ALERT2 pin, is it possible to reset the pin on bqstudio with a read Alert2Status() command?
Or, do I need some custom software to implement this command?
Thanks,
Part Number:TPS659037
Hello,
I have created a PCB with a TPS6590379ZWST to power up an AM5726 with DDR3L DRAM.
If I want to power it up, I get instantly two short-circuits between
VSYS(Power Supply) with GND and VDD_DDR(SMPS3) with short.
I measure the resistance on VSYS against GND. There it only 1,2 Ohm.
If I open the resistor RS6 I measure only 1 ohm between SMPS3_FDBK and GND.
The other side (the DRAM side) is fine, because the measured resistor is greater than 5k.
It is written on the surface of the PMIC:
TPS659037
OTP 97 1.3
7BASDFW G2 GI
I measure on VSYS 4,98V. There are a better Idea to have 3,8V?
It is possible that I kill the device with 5V? I think with 5V one still lies within the specification. I can rule out a short-term surge due to a sudden rise in vsys, at least I couldn't see it with the oscilloscope. I suddenly connected a 5 ohm resistor to VSYS to see how the DCDC of vsys reacts.
Here some screenshots:
Part Number:PTN04050C
We are using the PTN04050CAD for a +15V source and have had a catastrophic failure. The part overheated and or the output Capacitor "C155" on our board failed. Can you provide the schematics of this module? Is there a failure mode where the output can exceed the set voltage? The board was functional and in operation since 2014 at a military facility.
Part Number:TPS75233-EP
On page 15 of the TI Enhanced Products Guide 2015 (SGZT005A) the TPS75233-EP is listed.
On page 2 of this doc it states that "TIs Enhanced Product line is a solution ... w the following key benefits: ... Extended temperature performance (typically -55C to +125C or customer specified)".
However both (1) the TI web page for TPS75233-EP and (2) the TPS75233-EP datasheet mention only -40C as the low temp operating point.
Question: can the TPS75233-EP operate at -55C?
And I also have the same question for the TPS76718-EP.