Part Number: TPS61099
Hello,
I don't see efficiency plots for the device in down mode, do we have any data on this? Is the device more current limited in down mode vs boost mode (ie, is there more self heating to worry about)?
Thanks,
Nick
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TPS61099: Efficiency Values in Down Mode
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LM25118: NMOS Drive
Part Number: LM25118
Hi,
I'm using the LM25118 device to get an output of 26V from an input of 12 to 30VDC. When I used Webench to design my circuit it didn't protect my external NMOS Vgs with a zener. My NMOS both have a Vgs max of +/-20V. Should I be worried about breaking the transistors if I don't protect their gate?
Please see the attached file:
Thanks
Antoine
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TPS61099: Quiescent current in of fixed output devices
Part Number: TPS61099
Hello,
We're trying to calculated quiescent current for this device. Using the adjustable version we also have to account for the current of the external feedback resistors. These take 3-5uA of current which adds to our quiescent current for this solution. If we were to go to the fixed output version, does the quiescent current of the device increase or does it stay at ~1uA?
Thanks,
Nick
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BQ40Z50-R2: writing data flash
Part Number: BQ40Z50-R2
I am attempting to write to the BQ40z50 data flash (0x4000 - 0x5FFF) and have not been successful. I've confirmed that the device is in "full access" mode by examining bits 8-9 of the OperationStatus() register, and also confirmed that a "permanent failure" has not occurred related to the data flash by examining the PFStatus() register (as 0x0000 is returned).
To write the data flash, I am sending the following I2C string: 0x44, 0x06, 0x00, 0x40, 0x01, 0x02, 0x03, 0x04
It is important to note that a PEC byte is not included. I ave been successful in reading the data flash block starting at location 0x4000: The 32-byte data block read matches the default values found in the TRM.
Can you advise?
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UCD3138: UCD3138: simulation model for transient performance simulation and close loop simulation
Part Number: UCD3138
Hi
do you have UCD3138 simulation model for transient performance simulation and close loop simulation?
customer want to have it.
thanks.
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want to beat competitors at flyback AC/DC market!
Hello E2E,
I'm FAE of distributor at Japan. My specialty is AC/DC power supply.
Competitors are selling the integrated FET fly-back controller, that FET is high current acceptable, able to output upper 65W over.
PI and Infineon are strong.
We know TI has UCC28910/1. However, they can't beat to ICE2QR1080G of Infineon.
Does TI have any plan for drive out competitors from market for less than 100W AC/DC?
Best regards,
ACGUY
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TPS706: TPS706 Reverse current
Part Number: TPS706
Hi!
I would like to know if the Irev of the TPS706 is considering the current through the output resistors. For example if the input voltage is 0V and the output voltage is 3V what will be the total current passing through the output pin.
Thanks!
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BQ77915: Cell Balancing for ELDC
Part Number: BQ77915
Hi team,
I have a question about cell balancing for ELDC.
My customer put ELDC x8 in series and they want to do cell balancing for every ELDCs.
Does bq77915 support ELDC cell balancing?
If there are any other devices supporting ELDC cell balancing, please let me know.
Regards,
Kai
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BQ2947: Impedance between monitoring pin(V1-V4)
Part Number: BQ2947
Hi,
There are pins of monitoring voltage (V1-V4) on BQ2947. could you please tell me how much Impedance are each pins?
Thanks,
Katsu
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LM1084: 5-Volt 5-Amp Voltage Regulator
Part Number: LM1084
Hello, I am an Electrical Engineering student and would like some help with the following problem. I am using the LM1084 as an adjustable voltage regulator to output 5V at 5A as described in the datasheet. I printed a PCB to implement this design but it seems like the IC shuts off. I am using a 10uF Tantalum capacitor at the output as suggested and a 10 uF electrolytic capacitor at the input. I was also attempting to use a power transistor to output a higher current on a second design but since I cannot get the base design to function that design did not work as well and encountered the same problem. Is there something I am missing? I am using a 24V LiPo battery at the input and using a dummy load and cannot get more than 0.5 amps. I have done as much research into it as my knowledge allows me to so I was hoping someone can provide an idea as to why this is happening. Thank you very much.
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LM5175: Can LM5175 take in Vin = 3.5 ~ 24V to generate 5V 30A output ?
Part Number: LM5175
Hi
Can LM5175 take in Vin = 3.5 ~ 24V to generate 5V 30A output ?
thanks!
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LM5155-Q1: Difference Between LM51551
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TPS7A90: Input and Output capacitors value
Part Number: TPS7A90
Hello,
TPS7A90 datasheet(SBVS324) recommends to use ceramic capacitors of 10uF or greater at the input and output.
And there is also the below description on 8.1.3 Capacitor Recommendation.
“The TPS7A90 is designed to be stable using low equivalent series resistance (ESR) ceramic capacitors at the
input, output, and noise-reduction pin. Multilayer ceramic capacitors are the industry standard for these types of
applications and are recommended, but must be used with good understanding of their limitations. Ceramic
capacitors that employ X7R-, X5R-, and COG-rated dielectric materials provide relatively good capacitive stability
across temperature, whereas the use of Y5V-rated capacitors is discouraged precisely because the capacitance
varies so widely. In all cases, ceramic capacitors vary a great deal with operating voltage and temperature and
the design engineer must be aware of these characteristics. As a rule of thumb, ceramic capacitors are
recommended to be derated by 50%. The input and output capacitors recommended herein account for a
capacitance derating of 50%.”
So does that mean user can use 10uF with X7R, X5R or COG rated?
Or does that mean user should use 15uF with X7R, X5R or COG rated?
I also have another question.
Where does this 10uF for both input and output come from? My customer feels it is a little bit large capacitor.
Would it cause unstable issue if using less than 10uF?
Regards,
Oba
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BQ25882: EN HIZ is set to 1
Part Number: BQ25882
Hi
I used TI BQ25882, which could be charged at the beginning, but stopped charging after 2 hours.Upon inspection of the registers, it is found that register 01 EN HIZ is set to 1,What's the cause, please?
Register reads as follows:
SDIO][I]mtk_wcn_wmt_func_ctrl: OPID(3) type(9) ok
01-01 08:46:26.209343 253 253 W [ 746.692791].(3)[253:charger_thread]: [bq25882]adc not done
01-01 08:46:26.210068 253 253 W [ 746.693516].(3)[253:charger_thread]: [bq25882] reg@[0x0]=0xc8 [0x1]=0xd8 [0x2]=0x3 [0x3]=0xf [0x4]=0x35 [0x5]=0xd [0x6]=0x3d [0x7]=0x0 [0x8]=0xd [0x9]=0xf6
01-01 08:46:26.213976 253 253 W [ 746.697424].(1)[253:charger_thread]: [0xa]=0x0 [0xb]=0x80 [0xc]=0x0 [0xd]=0x0 [0xe]=0x0 [0xf]=0x81 [0x10]=0x80 [0x11]=0x0 [0x12]=0x0 [0x13]=0x0
01-01 08:46:26.217534 253 253 W [ 746.700982].(2)[253:charger_thread]: [0x14]=0x0 [0x15]=0x40 [0x16]=0x0 [0x17]=0x0 [0x18]=0x0 [0x19]=0x0 [0x1a]=0x0 [0x1b]=0x13 [0x1c]=0x82 [0x1d]=0x1c
01-01 08:46:26.220967 253 253 W [ 746.704415].(2)[253:charger_thread]: [0x1e]=0x46 [0x1f]=0x1c [0x20]=0x42 [0x21]=0x1 [0x22]=0xfd [0x23]=0x0 [0x24]=0x71 [0x25]=0x11
01-01 08:46:26.223847 253 253 W [ 746.707295].(2)[253:charger_thread]:
BR
Sunny
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WEBENCH® Tools/LMR36015: -5V Inverter Design
Part Number: LMR36015
Tool/software: WEBENCH® Design Tools
Hello,
I have designed -5V Inverter with LMR36015. I have attached my design and webench result. In the webench design, PG and FB pins are floating so I designated these pins as 'not connected' pins in my design. Is it true?
Thank you
(Please visit the site to view this file)
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TPS3890: Explain TPD(f)
Part Number: TPS3890
Hi,staff
TPS3890 Explain TPD(f)
Datasheet (SLVSD65A) page11 describes the description of "SENSE(rising) to /RESET propagation delay" (TPD(r)).
This makes it possible to understand the time adjustment that /RESET deasserts.
However, there is no description of "SENSE(falling) to /RESET propagation delay" (TPD(f)) in the datasheet.
The mechanism (method) by which /RESET is asserted by this is unknown.
Is it possible to provide materials that explain TPD(f)?
※There is no CT in the application note (SBVA047)
There is a description of /RESET assert.
There is no explanation of /RESET assert with CT.
best regards
cafain
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LM5026: Problems of LM5026MM Application
Part Number: LM5026
We make a AC to DC power module, mainly used in portable chargers, and plan to have LM5026MM to do it. There is a TI schematic diagram in the annex. There are several confusing places to ask, what is the output power of 1. +24V+15V-15Vl? 2. Can + 24V be changed to 5V 1A? 3. I need to make an AC to DC, three-way output, - 15V 100mA + 15V 100mA how to change the circuit and transformer, have good suggestions, thank you!
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UCC28630: About reduction of standby power
Part Number: UCC28630
Hi,
I am a FAE of a distributor dealing with TI products.
I used to ask questions about standby power in the following thread:
My customers are considering the following products, whose power is less than 30mW at no load.
The no-load power on the UCC28630 evaluation board is around 60mW.
However, in previous threads, it was pointed out that this power can be further reduced.
In order to further reduce the power from 60mW, what should I design with care?
I used to ask questions about standby power in the following thread:
My customers are considering the following products, whose power is less than 30mW at no load.
The no-load power on the UCC28630 evaluation board is around 60mW.
However, in previous threads, it was pointed out that this power can be further reduced.
In order to further reduce the power from 60mW, what should I design with care?
(Competition information)
Product: FA8A71NL3
No-load power: 100 VAC-> 26.8mW, 230 VAC-> 24.3mW
Product: FA8A71NL3
No-load power: 100 VAC-> 26.8mW, 230 VAC-> 24.3mW
Best regards,
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TPS55330: Efficiency at DCM Vin=7.4V, Vout=12.5V
Part Number: TPS55330
Dear support team
I measured the efficiency with TPS55330EM at different inductance. Please see the attached file.
As my measurement result, the efficiency with smaller inductance is better at DCM.
Could you let me know the reason why the efficiency with smaller inductance is better at DCM.
Best Regards,
Hirokazu Takahashi
(Please visit the site to view this file)
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BQ25713B: bq25713B CMPOUT pin when independent comparator is not used
Part Number: BQ25713B
Hello Support team,
When independent comparator is not used, can bq25713B CMPOUT pin set open as long as CMPIN connect to GND?
Thanks,
Koji Ikeda
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