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LM5106: LM5106: erratic switching, killing MOSFETs

July 11, 2019, 4:37 am
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BQ25882: OTG cannot be caught

July 11, 2019, 3:20 am
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Part Number:BQ25882

Hi:

The product designed by me USES TI's BQ25882, and trial production of 100Pcs has been carried out, among which 4Pcs of OTG cannot be caught. After analysis, it is found that ADC is not enabled. If ADC_Enable is set to 1, OTG can be caught.Please help to answer the following questions:

1.ADC_Enable Effect?

2.100 pieces have been trial produced, and all the software ADC_Enable is set to 0. Logically speaking, OTG cannot be caught, but actually only 4Pcs cannot be caught. Please help to solve the problem?

BR

Rain

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TPS65132: default output voltage

July 11, 2019, 3:32 am
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Part Number:TPS65132

Hi:

The product I designed USES TPS65132. If I2C does not connect, what is the default output voltage of the chip?Can you provide his driver code?thank you.

BR

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LM3560: How to route LM3560 inner BGA balls signals on TYPE 3 PCB with 3.5 mills min trace width

July 11, 2019, 4:29 am
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Part Number:LM3560

Hi,

In my country, best vendor can do min 3.5mills trace width. If I have to go for TYPE 3 board and Use this chip. I need to go for ball size lesser than mentioned min in datasheet 

can I reduce the min ball size to 0.225 mm which gives me enough space to take 88um trace from inner balls.

Can anyone point out what can go wrong in this case? 

Thanks

Atharva 

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LMG1210EVM-012: -200V operation

July 11, 2019, 5:25 am
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Part Number:LMG1210EVM-012

If I give -200V at input i.e. V(HS) will be -200 and PGND will be connected to GND.

In this case I will need to remove the bootstrap diode and give V(BST) from an external isolated supply

1)What should the value of V(BST) be?From datasheet 5V should be fine

2)Can V(BST) be continuous of should I control it externally so that it turns on when low side driver is on?

3)If I need to switch V(BST)  externally can I use the LO output signal to control a FET?

4)What are the other ways of controlling V(BST)?

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BQ25601: bq25601

July 11, 2019, 5:34 am
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Part Number:BQ25601

Dear,

We are exploring charging IC ,Our application is based to charge 18650 cell with single cell configuration.We will be going to use 5p pack of the battery.

We want charging current of 2 to 2.5A .The source of charging would be 5v/3A charger or 12 v rated DC Adapter,Also IC Current consumption should be less.The consumption of our system is around 30 mA and is battery operated. 

We explored some charging IC bq25601,So would this IC suit our application.

Also suggest us some other IC which we suits our application.

Waiting for your response..!!

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TPS62825: PG pin connection

July 11, 2019, 5:38 am
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Part Number:TPS62825

Dear *,

we have 4 TPS62825DMQ on our PCB to supply four different voltages 3V3, 1V8, 1V2, 1V1.

Vin is 5V.

Can we connect all PG pins together and pull it up to Vin 5V, and then connect to mos-fet that will drive the power good LED?

What should be the size of pull-up resistor if all four PG connected together?

Best Regards,

D.

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TPS54335A: Please recommend it: be similar to the tps54335 function. The current needs to be up to 4A.

July 11, 2019, 5:42 am
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Part Number:TPS54335A

It is recommended to be similar to the tps54335 function. The current needs to be up to 4A. Please recommend it.

Is it TPS56335? Or have better cost-effective device;

Thanks

BRs

Elsa Duan

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LMR33620: Validating design BOM

July 11, 2019, 7:02 am
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Part Number:LMR33620

Hello,

I have chosen the following parts for the LMR33630ADDAR ‑ 6V-30V to 3.30V @ 2A design:

Cin: GRT31CC8YA106KE01L,

Cinx: 810-C3216X7R2A224K,

Cvcc: 810-CGA3E2X5R1A105MA,

Cboot: 963-HMK212B7104KG-T,

L1: 652-SRR1240-150M,

Cout: 81-GRM31CC80J476KE8L (quantity 1),

Coutx: 810-CGA3E2X5R1A105MA.

Unfortunately my design is not starting up and I would be pleased if you could take a look at the parts to check if they are fine. I'm trying to figure out what went wrong. 

Kind regards,

Michal

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BQ20Z75-V160: Is there any UL report for this device ?

July 11, 2019, 7:05 am
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Part Number:BQ20Z75-V160

Dear all

       Is there any UL report for this device ? Or other certification report ? Certification of any aspect.

       Please share to me the reports, or certificate number, Thanks a lot.

       My email: went.cao@wpi-group.com

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BQ24075T: bq2407xT Input current transitions

July 11, 2019, 7:46 am
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Part Number:BQ24075T

When trying to transition from input current of 500mA to 1500mA (transition form 10 to 01 is simultaneous) , the input current changes trough either 100mA or 0mA. 

This causes problem when the battery is absent. This causes the system to reset.

Is there a work around?

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BQ25713: Switcher not starting - SYS_SHORT bit set

July 11, 2019, 8:00 am
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Part Number:BQ25713

Hello TI power forum,

I'm testing a design based on the BQ25713 and have noticed that occasionally when cycling the power (VBUS) that the switcher will not start up but VSYS stays just over 1V and the SYS_SHORT bit is set. I've tried but cannot reproduce this behavior on the EVM module. We've stayed very close to the EVM reference design so I'm not too sure what is causing this issue. If I manually clear the SYS_SHORT bit then the switcher will immediately start-up.

Some additional observations. With the EV2400 connected and battery management studio open and monitoring the BQ25713 registers I notice that the SYS_SHORT bit actually gets set on a power down event (only sometimes). If I then turn power on immediately it will be stuck on a SYS_SHORT and power cycling will not help unless I power down long enough for the capacitance to drain and SYS_SHORT bit resets (about 5 seconds).

Any idea as to why this is occurring?? This seems to happen in about every 1 in 10 power downs and will only really manifest itself if I power up right away while the SYS_SHORT bit is set.

Thanks,

Dan C.

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BQEVSW: bqevsw with ev2400 not read data flash

July 11, 2019, 8:10 am
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Part Number:BQEVSW

Hello. I have ev2400, trying to raise the battery after a full discharge from the macbook a1502 on the controller bg20z45 v7.02. When I try to read the data flash program gives an error reading Data Flash Subclass Voltage, Code = 772

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TPS54620: SS/TR being pulled low before PG falling?

July 11, 2019, 8:26 am
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Part Number:TPS54620

For the TPS54620 what are the conditions which would cause SS/TR to be pulled low prior to PG? 

The SS/TR pin is connected to a voltage divider which remains steady during this event.  The divider voltage at SS/TR is 1.5V.  

Thanks,
Allen

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TPS65131-Q1: Radiated EMC issue

July 11, 2019, 8:33 am
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Part Number:TPS65131-Q1

Dear team,

My customer use this device, when they tested the radiated EMC, it failed. Vin=5V, Vout1=10V, Vout2=-10V, Ioad current=10mA.

The 1.44M frequency point exceeded the standard in the EMC test radiation emission. Through the testing with near field probe, it is determined to be generated by the 65131 circuit, the waveform of the negative phase power switch has a spike on the oscilloscope. The RC snubber circuit is added, but the result didn't improve. Can you help to provide an operational correction or solution to this frequency? 

When testing the EMC, the customer changed 0ohm resistors to magnetic beads;

When using the near field probe to test the waveform, the customer also did some changes as below,

1. Increase the load at the positive and negative output terminals respectively, and the resistor is changed from 1k to three 1k in parallel;

2. Change 2 inductors from 4.7uH to 6.8uH (TDK: SPM5030T-5R6M-HZ);

3. Positive and negative outputs are respectively connected in parallel with 560pF capacitors;

4. Add snubber circuit in parallel with the negative direction diode, is 20R, 680pF;

The switching frequency is 1.38MHz. The EMC test result is as below,

SW waveform(L=4.7uH)

SW waveform(L=6.8uH)

negative phase output noise

near filed probe test

the schematic is as below,

the layout is six-layer, the first top layer is as below,

Thanks & Best Regards,

Sherry

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LM340: LM340MP-5.0 Input Voltage Range

July 11, 2019, 8:47 am
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Part Number:LM340

Hi,

 The datasheet for this part recommends operating with 7.5V < Vin < 20V. Does anyone have any experience running this off higher voltage rails? I'm looking to use something around +25V or even up to 30V. What effect could this have on the operating characteristics?

Thanks

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BQ2962: BQ2962 OUT-pin

July 11, 2019, 8:49 am
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Part Number:BQ2962

Hi TI,

i have a question to the OUT-Pin of the BQ2962. If an undervoltage condition at one of the connected battery cells happens, switches the OUT-Pin to High? Or only by an overvoltage condition?

This is not clearly documented in the datasheet. In the block diagram an page 12 is a trigger shown by charging/discharge. On page 20 in the application curves is no trigger to the OUT-Pin shown.

In my application it works in undervoltage condition too.

What is right?

Thanks for your answer.

Thomas Golitz

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Recommended railway power supply scheme

July 11, 2019, 8:52 am
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Dear all :

       I have the following power scheme requirements

Input voltage：DC-160V
Output voltage：(1) DC-24V;(2) DC-48 V
Output power：100W
PCBA size：1/2 brick, 1/4 brick each provide one solution, can be the same solution

Please recommend a low-cost solution?

Thank  you!

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TPS3430: Is a tps3430 good choice?

July 11, 2019, 10:28 am
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Part Number:TPS3430

Hi Tis,

I want to find a watchdog IC, the feed dog time should be over 30s, if Tps3430 is a good choice. Or pls give me some advice。

thanks a lot.

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BQ78350-R2-DEVICE-FW: Problem with parameter setting, the learned full charge capacity decreases by value we set in FCC learn down

July 11, 2019, 10:33 am
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Part Number:BQ78350-R2-DEVICE-FW

Hi,

I'm posting this question on behalf of my customer. It appears they're having trouble with the EVM of the BQ78350-R2.

we have a problem with the parameter setting of BQ78350-r2.

After each cycle the learned full charge capacity decrease by the value we set in FCC learn down. 

The design capacity is 15042 mAh. Normally the pack capacity should be about 1000 mAh above this value, but every time we discharge the pack the learned full charge capacity drop by the specified FCC learn down.


What can be done to correct this?

Thanks,

Lauren

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