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BQ25505: The main purpose of the EN pin

April 16, 2019, 2:51 am
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Part Number:BQ25505

Hi 

Attached is the schematic diagram of BQ25505, please help review.           

And for BQ25505, I have some questions to consult:           

1. The reference voltage of the EN pin of BQ25505 is VBAT_SEC. I have some questions about this pin:           

(1) What is the default level of EN, or the status of the pin in suspension, whether there is an internal drop-down setting.           

(2) If the high level of EN refers to VBAT_SEC, then there is a minimum.           

The main purpose of this pin is to raise EN to shut down BQ25505. At present, we hope to save the most electricity and not cause leakage.           

2. From the spec point of view, VBAT_OK_HYST should be higher than VBAT_OK_PROG, but the document set on the official development board is the reverse.

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LM27342: Output current limit

April 16, 2019, 3:13 am
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Part Number:LM27342

7.3.5 Current Limit
The LM2734x and LM2734x-Q1 use cycle-by-cycle current limiting to protect the output switch. During each
switching cycle, a current limit comparator detects if the output switch current exceeds 2 A minimum (LM27341)
or 2.5 A minimum (LM27342), and turns off the switch until the next switching cycle begins.

Is there any suggestion about how to set a lower current limit?

Francesco

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UCC28951: Reference design for high output voltage solution (over 2kW)

April 16, 2019, 3:15 am
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Part Number:UCC28951

One customer is looking for Full-Bridge TI-Design, required spec is below;

・Input: 385VDC from UCC28070 (375V ~ 395V)

・Output: 140V / 15.3A (2142W) ~ 21.4A (3000W)

I looking for Full-Bridge TI-Design based on UCC28951 or UCC28950 solution, but I didn't find high Vout design.

Is there matched or near design? (Customer request is schematic and efficiency data)

If there Reference design for combination with UCC28070 or UCC28070A (PFC), it is the best solution.  

By the way, I found PFC design (spec is below); PMP4259, PMP4311, and Webench report. 

・Input: 198VAC ~ 264VAC (200V) 

・Output: 385VDC (375V ~ 395V) / 5.56A (2142W) ~ 7.89A (3000W)

Best regards,

Satoshi

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BQ28Z610: difference RSOC reading by EV2300 and host MCU

April 16, 2019, 3:31 am
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Part Number:BQ28Z610

Dear Ti Experts,

My customer is evaluating BQ28z610, when they use EV2300 to read RSOC, it's ok; however, if they use host mcu through I2C to read 0x2c/0x2D every 10~30S, there will be some abnormal data occasionally , and back to normal next time, as you can see from below picture. Is there EV2300 get any filtering mechanism to RSOC? Or maybe there is any inappropriate command from host mcu I2C ? Could you kindly give some advice for this case? Thanks a lot. Customer only find the RSOC data have such issue and all other data from I2C seem all right.

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TPS25910: TPS25910 power limit

April 16, 2019, 3:42 am
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Part Number:TPS25910

Dear Sirs!

I have a 14,5VDC power supply, I put the TSP25910 in series with it. I have some small load on the TPS25910's output and there is a big one: 14,5V/2,2A. I set the current limit to 3,5A

Unfortunately this load made the chip to be hot - 125°C

I don't really understand the datasheet and the EVM document: I thought that the IC could have 3-20VDC output at 5A as I see in the EVM's documents schematic on page 3.

In contrast with this in the datasheet I see that there is a Power limit 3-7.5W  on page 4. and there is a Power limit vs Junction temperature Figure 3. on page 8. and there is a Maximum load at startup on page 17. (it means to me that 12W could power up...)

So what is the truth? Did I misunderstand the power handle capacity of this chip? Could I use it for my 14.5VDC/2.2A load or not?

Please help me!

Regards: Zsolt

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LM5165: X suffix - Output not reaching 5V

April 16, 2019, 3:43 am
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Part Number:LM5165

Hello,

I have created a PCB using the schematic proposed on Webench. I have shorted RT to ground for PFM operation and shorted SS to ground.

L1 = 150uH, Cin = 1uF, Cout = 10uF.

I have not included Rseries.

The voltage does not increase beyond 1 volt.

Can anyone tell me what I need to check to isolate the issue?

Kind regards,

Sean

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BQ78350-R1: Golden Image (Scaling Factor)

April 16, 2019, 3:43 am
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Part Number:BQ78350-R1

Hello E2E Community!

I've just finished the assembling of a new 7S4P battery pack and I'm using the bq78350-R1 for the first time.

It's also the first time I'm using the CEDV algorithm.

Now I want to create the golden image, but the bq78350-R1 is configured to scale the current by a factor of 10.

The question is, how do I report the scaling factor to the GPC tool respectively to TI?

(e.g. the discharge current that is applied is about 25000mA but the fuel gauge reports 2400mA)

Thank you very much.

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BQ27426: Design Capacity

April 16, 2019, 3:46 am
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Part Number:BQ27426

Hi 

The design capacity of BQ27426 is 14000 mAh, but the specification is 8000 mAh. Which one is right?

We use three 18650 batteries in parallel, with a total capacity of 10,000 mAh.           

Can BQ27426 support it?

Thank you.

Jerry

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BQ34Z100-G1: Alert signal register bit

April 16, 2019, 3:53 am
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Part Number:BQ34Z100-G1

Hello there,

I was wondering either there is any bit, in any register of the BQ34Z100-G1 device that would indicate either the #ALERT signal is asserted? I was trying to find it in the datasheet, but with no luck. Asking here just to make sure I havent missed it.

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TPS2065D: USB Power distribution switch solution

April 16, 2019, 4:15 am
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Part Number:TPS2065D

Hi there:

We'd like to find a suitable solution (pin2pin or else) to competitive with RT9706 power switch for our customer  

But it since like the TPS2065D is same size but different pin define. 

Any other suggestion for 0.5A & 1A those two application? 

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BQ40Z50-R2: which steps are necessary to enter the stand alone mode

April 16, 2019, 4:21 am
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Part Number:BQ40Z50-R2

Dear TI Team,

I have BQ40z50emv updated to -R3 Firmware.

Currently design BMS for 3s1s configuration. 600mAh 13450 Cells

With BQ-Studio I can turn on the charge and discharger FETs, the balancing function was not tested yet.

Which configuration steps are necessary to get BQ40z50 into the Stand-alone mode.

reagards,

Mike

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TPS7A19: Max. ratings for Vout

April 16, 2019, 4:29 am
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Part Number:TPS7A19

Hi all,

I have a question: the max. rating is for Vout=VIN+0.3V. At the switch-off moment in the application, it's not possible to guarantee that voltage. There are on the output up to 80µF. The input voltage can drop within a few ms from 20V to 0V. What is the maximum current of the body diode for a short amount of time? When is an external reverse diode required?

Best regards, Xaver

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TPS2372-4EVM-006: TPS2372-4EVM-006 Altium Project

April 16, 2019, 4:37 am
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TPS61322: TPS613222ADBVR max. output current @ 5V Vout

April 16, 2019, 4:41 am
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Part Number:TPS61322

Dear Sir/Mam

Kindly guide us for TPS613222A part. we have some query regarding this part.

Input voltage apply through the Li-ion battery Vin range is 3.7V to 4.2V 

1. Can I use the TPS613322 for input voltage from 3.7 to 4.2V and output voltage from 5V @ 1.8A current?

2.  Schottky diode is necessary for 5V@1.8V design? kindly suggest a suitable diode part for design 

3. What is Iq for 5V Vout design?

We are waiting for your response.

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BQ35100: How to read SOH value using BQ35100

April 16, 2019, 4:48 am
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Part Number:BQ35100

I am using BQ35100 for SOH, but I am getting an only battery voltage value but not getting SOH, current, temperature values.

For voltage, I am simply sending 08/09 commands through I2C, I am using Arduino IDE.

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BQ34Z100-G1： About chemical ID

April 16, 2019, 4:54 am
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Part Number:BQ34Z100-G1

My product is ready to match the chemical ID. There are some doubts at the moment:
  1. What is the matching process for chemical ID? The data is first charged to saturation, waiting for vacant for 2 hours, discharged to the lowest voltage at 0.1 C, and then vacant for 5 hours, where the entire process data needs to be recorded?
  2. Can I record the discharge first and then record the charging data? If so, what should I do?
  3. Is it a watch to record data with BQstudio?
  4, using BQstudio to record the data, how to upload to TI official ID matching?

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TPS23880EVM-008: How to get 48V voltage output and let it work

April 16, 2019, 5:01 am
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Part Number:TPS23880EVM-008

Dears,

We have got the TPS23880EVM-008,BOOST-PSEMTHR-007 and TPS2372-4EVM-006 demo,we want to verify 802.3bt POE application and want to check how large power these DEMO can be loaded.

but we can't have the USB2ANY board to connect PC.

We supply  TPS23880EVM-008 demo board's J1 with 48V, and supply 3.3V_USB with a external 3.3V,but we can't get port voltage output,How to make to get the TPS23880EVM-008 work? Does the USB2ANY must be used to connect PC to config then can work?

Thanks!

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BQ76930: cell voltage deviation above 50mv after calibration?

April 16, 2019, 5:17 am
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Part Number:BQ76930

Dear TI Experts,

My customer has designed BQ7693003 in their product and worked on MP stage, after they finished 10Kpcs PCBA, they get ~50pcs BQ7693003 cannot accomplish voltage calibration.

The phenomenon are the voltage from VC10--10th cell is around 50mv deviation while the max deviation from datasheet is 40mv.

Their Calibration used 3.6V power source and tested 3.6V and 4V to see the deviation. The abnormal 50pcs are ok(around 10mv deviation) to measure 3.6V and failed to measure 4V (50mv deviation)

 

They tried the AB-BA test and confirmed the phenomenon followed chips, they tried to re-solder BQ7693003 to eliminate the influence of mechanical stress and the result is the same.

They measured the impedance of these chips and can’t find obvious difference between normal chips. Except cell voltage of 10th cell , all other function of these 50pcs BQ7693003 are normal.

Except these ~50pcs BQ7693003 (0.5% percent ), other 99.5% of 10Kpcs are all worked fine and the cell voltage deviation when measuring 3.6V and 4V are all within 10mV.

 

Could you kindly give some advices about this case? Thanks a lot.

 

 

From the datasheet:

The performance of the cell voltage values measured by the 14-bit ADC has a factory-calibrated accuracy,

as follows:

• +/– 10 mV TYP, +/– 40 mV MIN and MAX from 3.6 to 4.3 V,

• +/– 15 mV TYP, +/– 40 mV MIN and MAX from 3.2 to 4.6 V, and

• +/– 50 mV MIN and MAX from 2.0 to 5.0 V

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BQ24092: BQ24092

April 16, 2019, 5:21 am
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Part Number:BQ24092

Hi,

I am using BQ24092 in my charger project. I connect the "out" pin directly to a fuel gauge Vdd. I notice the fuel gauge works only when the battery insert. If there is no battery, the fuel gauge doesn't work, even the "out" pin has around 4.2V . I want to know, when there is no battery, no load connecting to the "out" pin of BQ24092, the voltage on the "out" is floating voltage or a real 4.2V?

Thank you.

Bo Zhou  

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TPS2553-1: Minimum output capacitance

April 16, 2019, 5:30 am
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Part Number:TPS2553-1

Dear Sir,

As datasheet 11.2 show. Can use 10uF for  TPS2553 output capacitance? If can't, how many minimum output capacitance for TPS2553?

Best Regards,

Sam

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