Part Number: TPS54531
Hello TI,
I used TPS54531 for 3.3V, 3.5A output for 5V input. When I plug in the power source I don't receive any output at once. I get output in few attempts and it remains stable further.
Below is the circuit I made. Please suggest,
Part Number: LM26420
Hi
At page 22, it is mentioned as below.
. Ferrite based inductors are preferred to minimize core losses when operating with the frequencies used by the LM26420.
This means the inductor is recommended the ferrite type.
Is the metal core type possible to use ?
I understand the metal core is small inductor value but it can be used for large current application. And it has high core losses. (Rac?)
Is there any other concerns if we use the metal core type?
Best Regards,
Koji Hamamoto
Part Number: TPS61235P
Hi,
I am designing a boast circuit with TPS61235P. according to Spec, it can get a Fixed 5.1-V Output Voltage, but I get 5.26V without load.
In addition, when I connect a load with 3A discharge , the Output Voltage declines to 4.5V. (Input Source is 4V, 5A).
what is problem with my circuit? 
Part Number: LP5036
Tool/software: Code Composer Studio
Q1: What’s the right direction when USB2ANY module is connected to the LP50xx EVM?
Q2: What is the purpose of color mixing? Is it similar with brightness control? Why there is no individual brightness control for each output channel?
Q3: How to achieve a user-defined dynamic lighting pattern with LP50xx device?
Q4: How to control the color temperature of RGB- LEDs using LP50xx device?
Q5: How to estimate the junction temperatures of LP50xx device?
Part Number: TPS650861
Hello,
Could any one confirm two questions from my customers.
1. Minimum Vin for power stage? In the datasheet, it is suggested that Vin must arrange from 5.6V to 21V. Is it possible to connect a lower voltage, say 5V to Vin?
2. How to adjust the switching frequency?
Thanks!
Paul Ren
Hello E2E,
Our customer has plan to minimize for UV fluorescent tube ballast circuit.
It is using many discrete semiconductors for ballast circuit now. Does TI have any soluation?
Regards,
ACGUY
Part Number: LP2985A
Hi There,
In our board, after program one particular LED should blink. (Means that board got programmed correctly).
In the below circuit at location IC U4 if we use Microchip brand IC (MCP1801T-2502I/OT) or SHARP brand IC (PQ1X251M2ZPH) means that particular LED is blinking correctly.
C9: - CAP CER 10UF 16V Y5V 0805,
C10: - CAP CER 10UF 16V Y5V 0805,
C11:- CAP .1UF 50V CERAMIC Y5V 0603
But if I use TI brand IC (LP2985A-25DBVT) at location U4 means that particular LED is not bilking. But am getting +2.5V correctly. In the same board if i replace Microchip brand IC (MCP1801T-2502I/OT) or SHARP brand IC (PQ1X251M2ZPH) means that particular LED is blinking correctly.
Can you please advice, if I want to use TI brand IC in my board… any components/capacitors values need to change at IC U4 area? Or any other comments on this..? or Output current is not enough in TI brand ICs(150milliamps)?
Expecting your valuable advice..
Part Number: TPS54308
Hi：
I use TI TPS54308. I have some questions to consult, please help me solve them，thank you.
1.We put a magnetic bead on the DCDC output;The current magnetic bead is rated at 2.2A and can withstand 4.4A/20mS.I would like to ask you how long it takes to protect the output current of TPS54308 above 3A and cut off the output?
2.Chip PWM cycle refers to the chip internal switching frequency 0.35M, that is, 47uS?When the output is about 9V,47uS and the current is greater than 3A, can it be cut off？
3.In the specification, I(LIM_HS) max5.9A, I(LIM_LS) Max 5.5A, I want to know if it is larger than this parameter, can it be cut off?
4.In the specification, section 7.3.11.2, what exactly do 512 cycles and 16384 cycles refer to?Can you help to explain?
BR
Sunny
Part Number: TPS2051C
Hello,
Does the following condition occur when the enable signal is disabled?
Doesn't it flow to the input side via the body diode of the FET?
The MOSFET power switch blocks current from OUT to IN
Are there other such devices?
Part Number: BQ27Z561
Hi,
I have few of questions regarding programming bq27z561 using micro-controller. And for that i have stored all four files generated by bqstudio in MCU flash. My overall aim is to get accurate battery information while reading this device.
I am following a method mentioned in Appendix A of slu801.pdf to program bq27z561 via MCU.
Now,
1. For bq.fs when i enter in ROM mode I2C operations are performed on slave address 0x16 (0x0B on physical line) but those transactions are failing.
For example,
;--------------------------------------------------------
;Unseal device
;--------------------------------------------------------
W: AA 00 14 04
W: AA 00 72 36
W: AA 00 FF FF
W: AA 00 FF FF
X: 1000
;--------------------------------------------------------
;Go To ROM Mode
;--------------------------------------------------------
W: AA 00 00 0F
X: 1000
(Up to above stage for bq.fs MCU is writing I2C commands to slave device successfully but after device goes in slave mode all I2C transactions are failing)
write operation in file : W: 16 05 12 00 00 10 00 07 C1 E5 66 19 67 60 67 9B 03 C1 9B FF C0
MCU is writing to slave address 0x16 with data "00 00 10 00 07 C1 E5 66 19 67 60 67 9B 03 C1 9B FF C0" on address "0x1205" (Is this operation correct?)
2. For gm.fs file when it comes to compare device firmware data from gauge does not match with the gm.fs file data.
for below operation highlighted bytes are not matching with my device.
;--------------------------------------------------------
;Verify Existing Firmware Version
;--------------------------------------------------------
W: AA 3E 02 00
C: AA 3E 02 00 15 61 00 04 (this data does not match with my device)
Also, i have ignored this comparision and go on writing bq27 furthere for gm.fs file but for these operations as well write data (W) is not matching with the compare commands (C).
;--------------------------------------------------------
;Data Block
;--------------------------------------------------------
W: AA 3E 00 40 63 2F 05 C2 28 BF 16 6B 53 40 0C 8C 70 4A (performed successfully on slave device 0xAA cmd 3E & address 0x4000 and data is "63 2F 05 C2 28 BF 16 6B 53 40 0C 8C 70 4A")
W: AA 60 19 12 (this operation is performed successfully)
X: 200 (after this delay)
W: AA 3E 00 40 (this operation is performed successfully)
C: AA 3E 00 40 63 2F 05 C2 28 BF 16 6B 53 40 0C 8C 70 4A (data highlighted does not match when i read 4000 address again after above write operation on 4000 address)
Am i missing something here?
3. Is there any sequence i have to follow for programming bq27z561?
4. Can i get some help to understand file format for .srec & df.fs file such that i can execute I2C write command on bq27z561 slave device?
Note : I am using bqstudio generated gm.fs, bq.fs, df.fs and .srec files (as attached below in zip file) using bq27z561 EVK board.
(Please visit the site to view this file)
Part Number: TPS2121
I have two input，all is 5V.
IN1:5V_DC
IN2:5V_USB
When 5V_DC pulls out and 5V_USB keeps，the output volotage will drop
Could you tell me the reason？
Thanks
(Please visit the site to view this file)
Hi Support,
Do you have any recommendation for a Boost SMPS?
Input : 5V
Output: ~20V
To drive 3 strands of 7 series white LEDs.
20mA per strand.
Industrial grade
Loe switching freq.
EN-PWM
OVP/ short protection, thermal shutdown.
Thanks.
Hi team,
My customer uses below application. And I have two questions as below,
1. They want to use smaller resistor, R1=150k, R2=33k, is it ok? Then if they use these two resistors, could you please recommend the C1 value? 33pF?
2. As we know, the larger the divider resistance, the worse the immunity. If we choose R1=360K, R2=180K, how about the immunity?
Could you please help answer above two questions?
Thanks & Best Regards,
Sherry
Part Number: TPS7A03
Hi Team,
Customer is looking LDO that can support the following requirement.
Would you please recommend the proper solution for this?
BR,
SHH
Part Number: LM76202-Q1
Hi,
I am designing a dual charger front end with reverse polarity, OVP, UVLO as well reverse current blocking.
There are two charger inputs, MAIN and AUX. The MAIN charger input has priority, and no current sharing is allowed, i.e. AUX charger path is disabled if MAIN is active.
The application is 24V/48v battery powered and maximum current is 1.5A
The LM76202-Q1 looks promising but I am not able to find information on device availability.
Can you please advise if the part is in production?
If not, do you have a solution that satisfy the application requirements?
Best,
Alex
hi,
for a non-military drone (big battery pack though) we are looking for a >100V (70V is the bus) HS gate driver (isolated or not) with 100% duty cycle capability
I couldn't find anything, any advice or app note is more than welcome
thanks a lot in advance
KR
Vincenzo
Part Number: TPS54201
Hello,
could you take a look at our schematic?
We want to use 4 pieaces of IR-LEDs with 100mA max current.
The PWM signal has 3.3V amplitude.
I was wondering whether we could use a smaller inductor.
BR
Michael
Part Number: TPS22916
Dear team,
do we have a plot showing the leakage current relation from Vin to Vout in OFF state? In this specific application is Vout = 0 to 4,5V at Vin 4,7V to 5,15V.
many thanks
Lutz
Part Number: TPSM84209
We have a custom PCB with a TPSM84209RKHR as the initial 24v to 6v power supply. There are 7 other supplies that take the 6v and supply other voltages. 3.3v, 1.8v, 1.5v, 1.2v and 1.0v are buck regulators, a 3.3v LDO and a 0.75v DDR3 termination supply. We have 2 boards where the TPSM84209 has burned out. One we have investigated, the other is still off site with an engineer that is developing code for the board. The one we looked at get's so hot that the Vin pin gets welded to the copper pad on the PCB. It also carbonizes the PCB between the Vin pin and the ground layer just below. When the TPSM84209 and the other few components that are part of the 24v circuit are removed (input filter capacitors etc), there is still about 330ohms from the Vin pin to ground. If you look at the chip under a microscope, it looks like someone took a tiny blow torch around the Vin pin.
Both times the IC burned out were immediately after the engineer powered the board up. He had been working with the board for hours and had only made minor changes to the code in the FPGA between power off and on. The same code ran fine on another board. When we remove the burnt TPSM84209 and supply 6v directly to the rest of the board, the total current draw at 6v is only 0.5A and the board functions normally. So it doesn't seem like we are drawing too much current. Even if we were possibly drawing too much at power on, the IC has over current and over temperature protection which I think would protect it. This seems to be something happening inside the IC or possibly a PCB issue. I have verified our schematic matches the Webench schematic.
This board is also connected to a separate board via RS485. Each board has it's own power supply. There is a ground connection between them on the same connector as RS485. On this board, the ground wire is connected directly to ground. On the connected board, the ground wire is separated from its ground via a 100ohm resistor. The engineer working with the boards thinks it could be a grounding issue as both times the TPSM84209 burned out was when the boards were connected together.
We are stumped. A chat with Ti tech support pointed us here. I've given as much information as i can think of, I can supply more information if needed. Anyone have any ideas?
Thank you,
Chad
Part Number: LM26420
Hi
Our customer ask us how much is the max output capacitor that you recommend.
Most of case, the min output cap is calculated from the max ripple inductor current.
On the other hands,the max value is depended on the loop characteristic.(The corner freq is decreased when the capacitor is increased.) And also it is affected to the soft start time.
However it is not mentioned anywhere at the datasheet about the loop characteristic of this device. So , could you give us the recommend max value if you have?
Best Regards,
Koji Hamamoto