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BQ76PL455A-Q1: have inconsistent power consumption issue

March 24, 2019, 8:47 pm
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Part Number:BQ76PL455A-Q1

Dears,

We use 6PCS bq76pl455a-Q1 series connection in one battery PACK,for EV BMS application,it's a all in one BMS design,as below picture:

we test find the last one PCS BQ76PL455A who furthest away from the MCU,have a lower power dissipation compare with others, about 2mA current lower. We add some resistance to dissipation this,but can not make the 6 PCS bq76pl455a a fully power consumption consistent,this issue will impact battery behavior.

So, we want to get some better soluation to solve it,whether TI have optimized on this?

Thanks!

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BQ25882: BQ25882 D+/ D-

March 24, 2019, 8:51 pm
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Part Number:BQ25882

Dear Sir,

My customer use BQ25882 to do a design.

They use a unknown standard 5V adapter(5V/ 1A) and D+/ D- both pull-down a 10Khom to GND.

1. In datasheet page-17_ table2, customer would know BQ25882 will detect 500mA(101) or 1A(101) or another?

2. Why unknown 5V adapter 500mA/ 1A  are same VBUS_STAT register: 101 ? 

Please you kindly review & provide your suggestion..

Thanks!

Steven

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UCC28070: Current sense w/o trance

March 24, 2019, 8:56 pm
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Part Number:UCC28070

Hi,

Using transformer is recommended for current sense on the datasheet.

My customer hopes to realize current sense without transformer on the UCC28070.

Is it possible?

Best Regards,

Kuramochi

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LM5022: Can multiple output of LM5022 power unit be tied together to increase the output current?

March 24, 2019, 9:06 pm
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Part Number:LM5022

  Hello guys,

  One of my customers is considering using LM5022 for their new products.

 They have a queston as the follow.

 Q1. Can multiple output of LM5022 power unit be tied together to increase the output current?

 Also they have power supply develop plan for another project.

 Their power supply spec is the follow.

 Vin=16V (DC)

 Vo=125V

 Io=8A (No isolated)

 Q2. Do you have any solution to suit the spec above?

      If you have any solution, could you please tell me it?

 Your would be much appreciated.

 Best regards,

 Kazuya Nakai. 

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Asking for the edge detection and delay fucntion IC

March 24, 2019, 9:43 pm
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Hi Team,
Customer is looking for edge detection and delay function IC. (not just rest IC)
the customer's signal will always keep high or low, when high to low or low to high event can output trigger signal about 20 ms delay timing.

Would you please recommend the proper solution for this?

BR,
SHH

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BQ34Z651: Full Charge QMAX update in learning cycle

March 24, 2019, 10:12 pm
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Part Number:BQ34Z651

Hi There,

I am attempting to run learning cycles on two packs at the moment. One of these succeeds consistently so I have a good idea of what a successful learning cycle should look like.

One the other pack however, when I fully charge the pack during the learning cycle (FC is set) and then rest until VOK is cleared. The QMAX update never occurs (update_status never transitions fro 0x04 to 0x0D), and therefore MaxError never decreases from 100% to 3%. Therefore the learning cycle is unsuccessful, even after fully discharging the pack.

On the pack where the learning cycle is successful the transition of update_status and MaxError is seemingly simultaneous with VOX being cleared. And on other packs where learning cycles have failed in the past, VOK was never cleared. 

So I am not quite sure what is wrong wherein the pack both tells me it has completed it's measurements when fully charged (VOK is set) but also seems to fail at taking that measurement.

I have been using the following documents as references, but they have not been particularly helpful.

SLUA597
SLUA379E
SLUA421A
SLUA334B

Thanks,

David

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TPS7B7701-Q1: Timing of sequence for Vin and En

March 24, 2019, 10:15 pm
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Part Number:TPS7B7701-Q1

Hello Team,

I have question about the timing sequence for Vin and Enable. Do you have any rule the order the power sequence IN (1Pin) and EN (2Pin)? I look over the datasheet but I don't see any rule for setting these power sequence. If I miss setting for the power sequence, dose the output voltage go abnormal?

Thanks,

Masayuki Uchihara

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LP5569: LP5569 chaser pattern Sample for custom color

March 24, 2019, 11:05 pm
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Part Number:LP5569

Hey Kenneth,

I just wanna to know how to map the LED's for chasing  with different colors like purple, Yellow etc.

in case of RGB it was easy with MAP_Select instruction.

What instruction can we use for different color patterns

Can you help in Generation sample code ?

Thanks,

Srini

Thanks,

Srini

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TPS92310: Triac Dimmable AC-DC LED Driver Reference Design issue

March 24, 2019, 11:12 pm
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Part Number:TPS92310

1.My client asks about Triac Dim range 16:1,5:1 ,

2.Is there 220 VAC test data available?

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BQ76940: BQ76940

March 24, 2019, 11:13 pm
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Part Number:BQ76940

Dear  All:

    I plan to use the BQ76940 to monitor the 150S cell. every 15s as a independent module group.   As shown below，Can I use this connection to implement this functionality？or  can you give other suggestion for

 this application？ Thanks.

  

   

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TPS51622: What's the difference between TPS51622A and TPS51622?

March 24, 2019, 11:15 pm
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Part Number:TPS51622

Hi Sir,

     As the title mentioned , what's the difference between TPS51622A and TPS51622? And could you please help to share the datasheet and how to adjust the parameters of TPS51622?

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TPS22975: TPS22975 On/Off Question.

March 24, 2019, 11:21 pm
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Part Number:TPS22975

Dear TI Team,

Keep using the ON pin on / off of the TPS22975.

100ms ON / 100ms Off (PWM Waveform/ The frequency has not yet been determined.)

Input Voltage : 3.7V , Load : Peak 4A , Average 1.5A

I wonder if repeatedly turning on and off again can cause problems.

I wonder if there is something to be careful about in design.

Thanks.

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BQ79606-Q1: chain communication line power consumption

March 24, 2019, 11:29 pm
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Part Number:BQ79606-Q1

do you have daisy chain communication line power consumption about BQ79606-Q1,please help provide this data ，thanks！

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TPS62088: buck input noise test

March 24, 2019, 11:39 pm
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Part Number:TPS62088

Hi, 

My customer is wondering if the noise at input side will also be seen at the output side or not? 

the operating condition ii below: 

Input voltage 3.3V

Noise: 60mVp-p ~ 1MHz

Output voltage 2.5V

Can you help to comment on this case? 

Great thanks for your help.

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LM5067: Check a Design Review & Test Waveforms.

March 24, 2019, 11:41 pm
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Part Number:LM5067

Hello

My Customer reqeust a design review the LM5067 circuit.

I attached a Test Waveforms when Max Load.

Please Check a below data.

Regards.


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Voltage switch

March 24, 2019, 11:56 pm
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Dear *,

does ti has IC that can replace LTC4415?

it must be possible to select the input with external pin ( eg. EN)

Best Regards.

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TPS23756: transformer recommendation

March 25, 2019, 12:02 am
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Part Number:TPS23756

Hi team,

My customer is using TPS23756 now, could you please recommend the transformer based on the requirement below.

VIN=37~57V，VOUT=12V/1.67A (20W)，Fs=250kHz，Dmax<.50%.

Below are the recommended EFD20 transformer.

Do we have the mathcad or excel about how to select the transformer?

   

Thanks.

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BQ25895: how can we know if the battery exists?

March 25, 2019, 12:14 am
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BQ24650: Peculiar behavior on VFB pin

March 25, 2019, 12:31 am
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Part Number:BQ24650

I have designed a battery charging circuit using the BQ24650. I followed the ref design and the charge FET is Si7288. I used the calculation sheet (bqstroller calculation tools_V1.xls - sluc175d)  to calculate the resistor values.

I am using a 4 cell Li-Poly pack. I am currently using a bench top supply to simulate a Solar panel with a max voltage of 22V.

When I power on the PCB with the input sett 18V and the battery pack is semi discharged at about 15V the STAT2 LED lights up. On the FET there are no pulses but HIDRV in high and current flows to the battery.

There is no activity on LODRV. When I touch the scope pin on the VFB pin to measure the voltage, the STAT1 LED turns on and I start getting pulses on HIDRV and LODRV and the battery pack does charge.

My battery sense resistors are placed close to the BQ24650 and I have a 22pF cap across the high side of the 2 sense resistors. 

When I remove the scope probe, STAT1 is off and STAT2 turns on with no pulses on the FET.

When the STAT2 is on, the FET high side stays on and current flows to the battery pack.

Any help or ideas will be appreciated.(Please visit the site to view this file)

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TPS62175: connection dot disappear on the design document

March 25, 2019, 12:43 am
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Dear Specialists,

My customer is confirming TPS62175 by using WEBENCH and has a question.

I would be grateful if you could advise.

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When I made a design file, connection point of the circuit disappeared. 

The Simulation view is no problem.

I was wondering if you could  improve.

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I appreciate your great help in advance.

Best regards,

Shinichi

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