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UCC27712: Path during HS and VDD

August 21, 2019, 2:05 am
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Part Number: UCC27712

Hi,

My customer is evaluating the UCC27712 on their board.

Then, VDD voltage seems to appear at HS node when HI and LI = Low condition is kept.

Does the UCC27712 have a path during HS and VDD?

I guess that there is no path according to the following figure.

Best Regards,

Kuramochi

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TPS53211: Schematic review

August 21, 2019, 2:13 am
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Part Number: TPS53211

Hi Team,

Could you please help on schematic review for TPS53211? 

Thank you.

(Please visit the site to view this file)

Best regards,

C.T.

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TPS53626: Schematic review

August 21, 2019, 2:20 am
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Part Number: TPS53626

Hi Team,

Could you please help on schematic review for TPS53626? 

Thank you.

(Please visit the site to view this file)

Best regards,

C.T.

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TPS1663: reverse current higher than 50mA

August 21, 2019, 2:25 am
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Part Number: TPS1663

Hi team members.

I read in another thread (Title :TPS1663 can tolerant reverce current or not) that the internal diode of TPS1663 can only handle currents below 50mA.

I want to apply a reverse current of 50mA or more, what should I do?

If Schottky diode is connected to the IN and OUT terminals, is it possible to handle a current of 50 mA or more?

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TPS55340: When FB connect to GND, why COMP is a constant source current

August 21, 2019, 2:31 am
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Part Number: TPS55340

Hi team,

   I have read below application note and find that when the FB pin of the TPS55340 is grounded, the COMP pin will be a constant current source of 42 µA? Please help share me what is the reason? Thanks. 

http://www.ti.com/lit/an/slva559/slva559.pdf

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TPS23754: how much is the max power consumption?

August 21, 2019, 2:31 am
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Part Number: TPS23754

Customer wants to evaluate the thermal performance, but the datasheet doesn't show the power consumption data? Could you help check it? How can we calculate the possible max power loss? Thank you.

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LM5155-Q1: LM5155-Q1 system calculator

August 21, 2019, 2:34 am
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Part Number: LM5155-Q1

Hi ,

Could you please confirm that I fill is correct?

Warm Regards,

Lin(Please visit the site to view this file)

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TPS25982: Max Cout value of TPS259827

August 21, 2019, 2:45 am
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Part Number: TPS25982

Hi

My customer use TPS259827 under Vin=24V and Cout=1200uF.
But it don't operate. I think that the thermal shutdown operat because of  too big Cout.
What is the max value of Cout being able to use under Vin=24V? 

Best regards,
Yokota
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WEBENCH® Tools/LM5160A: LM5160ADNTT with fly-buck topology

August 21, 2019, 2:48 am
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Part Number: LM5160A

Tool/software: WEBENCH® Design Tools

Hi forum,

i used LM5160ADNTT in its isolated configuration with fly-buck topology.

when i used webench, it was recommend me to choose Cout2 (the capacitor that switch to source during time TON) with the value 270uF, with 5mohm ESR and 5.8A Irms.

the ESR i can understand, the Irms value look over-rated (those two parameters didnt get some attitude on datasheet) and when i used the equation on datasheet to calculate the capacitence i get a value much more lower then the webench recommend me (6uF).

the parameters i was filled on webench are:

  • Vin = 8.5-65
  • vout = 5 +/- 5%
  • Iout = 1.5A

the papameters i was filled in the equation in the datasheets are:

  • Iout2 = 1.5A
  • (delta)Vout2 = 0.25
  • Vout1 = 3.8
  • Vin(min) = 8.5
  • fsw = 231kHz

it is not make sense and also make me to choose an exotic capacitor (very big and very expensive) 

BR,

Itzik

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LMZ31710: Failure after SMT

August 21, 2019, 2:54 am
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Part Number: LMZ31710

Hi 

We have 10~20% failure rate after SMT.

Could you help to review schematic as attached? (DCBATOUT:4V, VCC_INIT:1V)

Besides, do you have recommend stencil pattern for this part?

If we bought this chip on the market (not from agent) , could we send it back to you for further failure analysis after cross verification?

BR,

CY

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UCD9244-EP: I cannot configure the number of rails.

August 21, 2019, 2:56 am
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Part Number: UCD9244-EP

Hi, I cannot configure the number of rails.

Please help me.

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CSD19534Q5A: Pressure value of CSD19534Q5A

August 21, 2019, 3:04 am
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Part Number: CSD19534Q5A

Hi

I got a questionabout CSD19534Q5A from my customer.
They will mount heatsink on this devise and be screwed shut it on the board.
How much pressure can I apply it?

Best regards,
Yokota
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LP2951: Looking for p2p to LP2951-50DR for higher than 100mA output capability

August 21, 2019, 3:22 am
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Part Number: LP2951

Dear E2E,

Please help to propose a p2p solution with LP2951-50DR, but Iout capability needs to be higher than 100mA.

BR,

Andy

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Which part numbers can meet my needs: input 18V~25V, output greater than 28V, output current 40mA~200mA. i don't care about light load efficiency because low current

August 21, 2019, 3:33 am
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Dear
can you give me Expensive medium cheap three  BOOST options?
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BQ51222: About BQ51222 and BQ51052B : wireless charging solution

August 21, 2019, 3:38 am
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Part Number: BQ51222

Hi, 

My customer is going to use BQ51222YFPR and BQ51052BYFPR to develop wireless charging products.

And they prefer to pass the certificate of Wireless Power Consortium (WPC) Qi and Power Matters Alliance (PMA) protocols

Please help to check :

1. If there any other better TI solution better/newer than BQ51222YFPR and BQ51052BYFPR ?

2. If there any documents for passing the certificate of Wireless Power Consortium (WPC) Qi and Power Matters Alliance (PMA) protocols ?

Thanks.

Mike 

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TPS23758: MTBF report

August 21, 2019, 3:45 am
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Part Number: TPS23758

Dear Sir.

Do you have an MTBF report available? Thanks~

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BQ30Z554-R1: how to check balancing FETs control?

August 21, 2019, 4:05 am
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Part Number: BQ30Z554-R1

 Hi e2e support team!

According to TRM, bq30z554 has special subcommands to check operation of Charge, DisCharge FETs as well as another IC's outputs like FUSE or GPOD for ease of manufacturing.

So me wonder if it possible to check performance of Balancing FETs in the same manner i.e. via sending subcodes to Manufacture Access register?

Thanks and best regards!

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LM3450: LM3450A

August 21, 2019, 4:08 am
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Part Number: LM3450

Hi Team,

I have a question about LM3450A (attached), please advise.

Thanks,

Shlomi

(Please visit the site to view this file)

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LMG1210: lmg1210

August 21, 2019, 4:32 am
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Part Number: LMG1210

Hi

  I am trying to build a hiend class D amp using LMG1210 and GanFet Mosfets

My question is about dead time. In your datasheet of LM1210 you have a time mismatch of 1ns nominal and max 3.4ns

   However the minimum R for dead time (PWM) is 0.8 nominal and 3.1ns max. By using the minimum R can you create a shoot-through in Mosfet from the above. Is that correct ?

Now using the HI LO input , you have no way of setting dead time. Does it mean it was eliminated (dead time)  if we use the HI LO drivepins  instead of PWM input ?

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BQ25713: What is the VSYS voltage when power up from dc source and battery removed?

August 21, 2019, 4:43 am
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Part Number: BQ25713

Hi ,

    Customer want to implement USB PD like reference design PMP40441. Below is the block diagram. The MCU power is from TPS65251 .

They want to ask when adapter plug in and battery be removed or battery depletion whether or not the VSYS have output voltage

,they are worry about if the VSYS do not output voltage the mcu can't be  power up to config bq25713 and tus422. 

The CELL_BATPRESZ Iis config to 3 cell. If VSYS can output voltage on VSYS without any config. what voltage will be expect on VSYS. 

Thanks

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