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BQ25505: What is the maximum current on VSTOR?

May 13, 2019, 7:34 am
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Part Number:BQ25505

Hi.

I have a board with the BQ25505.  When the load is higher than aproximately 260 mA, the voltage on VSTOR drops to 0 V (the battery has a voltage of 3.75 V)

In different posts the maximum current that mentions on VSTOR is different, links are below, in the first is mentioned that maximum current is 1 A, in the second is mentioned that maximum current is 285 mA and in the last is mentioned that maximum current should be less than 0.5 A.

  • e2e.ti.com/support/power-management/f/196/t/739164?tisearch=e2e-sitesearch&keymatch=bq25505%20current%20vstor%20vbat_sec
  • e2e.ti.com/support/power-management/f/196/t/540362?tisearch=e2e-sitesearch&keymatch=bq25505 current vstor
  • e2e.ti.com/support/power-management/f/196/t/765259?tisearch=e2e-sitesearch&keymatch=bq25505%20current

The schematic is the suggested in the datasheet for a solar application:

Note: we don't use the primary bat.

So, do you have some document where the maximum current through VSTOR be indicated (using the configuration shown)? or could you tell me what is the maximum current?

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TPS3305: Is there any materials about welding temperature and time? And the wave picture during welding?

May 13, 2019, 7:56 am
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Part Number:TPS3305

Dears:

Is there any materials about welding temperature and time? And the wave picture during welding?

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UCC28631: The VDD voltage has been changing triangularly between two voltages.

May 13, 2019, 7:58 am
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Part Number:UCC28631

I have many ucc28631.Their waveforms have different peaks and troughs.They are:

15V and 5V

10.6V and 5V:

12.6V and 5V:

I can't find the explanation from the datasheet.Can you tell me what the status of the chip is now?What's wrong with the ucc28631?

The schematic diagram is as follows

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UCC28C43: instability of the output voltage

May 13, 2019, 8:25 am
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Part Number:UCC28C43

Hello,

I designed a DC/DC Boost converter with the following specif.:

- Vin 30/40 V

- Vout 325 V

- Iout 600 mA

I used the ucc28c43. The simulation as you can see on the picture does not achieve the desired output voltage even if I use a larger TSTOP. I also tried to use steady state conditions but the situatios remains the same.

Maybe I got a wrong design of the compensation network. Can you help me to undestand how to solve it?

Thank you in advance,

Gerardo Saggese

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BQ27220: GPCCEDV got error.

May 13, 2019, 8:31 am
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Part Number:BQ27220

Hi Expert,

Can you help to review the data? I always got the failure report. Thanks!

(Please visit the site to view this file)

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TPS7A11: Asking for te PSRR curve

May 13, 2019, 9:16 am
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Part Number:TPS7A11

Hi team,

cusotmer would like to compare the PSRR curves of LP5910 and TPS7A11.
Could you provide the PSRR curves that based on the following conditions?
Vin: 2.0V
Vout: 1.8V
Iout: 300mA
Range: 1kHz ~ 1MHz

BR,
SHH

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Inquire TI P2P solution to replace MPS solution

May 13, 2019, 9:25 am
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Hi Sir,

May I learn from you do we have P2P solution could replace MPS solution as below?

MP2161
MP2235
MP2234GJ-Z
MP1474D
MP1475

If not, could you kindly help to suggest the most suitable solution to compete with MPS?

Thank you for your kindly help.

Edward Chen

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BQ25570: Maximum power point tracking for triboelectric energy harvesters

May 13, 2019, 9:26 am
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Part Number:BQ25570

Dear Texas Instruments Employees and forum users,

I am working on triboelectric nanogenerators for energy harvesting and would like to measure the output of our prototypes in an automated way.

For now, we track the voltage output of the prototype that is plugged in series with analogue load resistances and measure the voltage drop across the resistances with an oscope. This helps us to track the maximum power point (MPP) of the prototype and determine the internal impedance of the devices. The authors of all scientific papers (see attached graphs as an example, source:advances.sciencemag.org/.../e1700015) we have screened perform this MPP tracking manually.

However, this just takes very long, which is why I would like to ask for your assistance in finding an automated solution. I am sure many Universities located in the US or China and also companies would be happy to have such a solution. We are in particular interested in the resistance range of 1-10MOhm and below. Digital potentiometers usually do not have a maximum resistance above 1MOhm and also have high manufacturing tolerances. The energy harvesters output an voltage of around 700V and a current of around 10-50 µA.

It would also be very helpful if you could recommend me a power management IC that is capable of rectifying, down-stepping and charging a battery/capacitor bank with a voltage in the microcontroller range.

Thanks in advance and best regards,

Marco

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LM5023: Inquire LM5023 could pass CoC V5 tier 2 or not

May 13, 2019, 9:29 am
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Part Number:LM5023

Hi Sir,

May I learn from you does LM5023 could pass CoC V5 tier 2 standard with UCC28056A?

Thank you.

Edward Chen

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Inquire P2P or competitive solution to replace competitor solution

May 13, 2019, 9:52 am
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Hi Sir,

May I have your help to check if we have P2P or competitive solution to replace below competitor solution

MP8869
MP8774
RT2515H
MP2483DQ-LF-Z
SY8089AAAC
SY8003CDFC
MPM3810GQB-Z
MPM3830GQB-Z
MP1499
LTC3122EDE
LTC3533EDE

Thank you.

Edward Chen

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TPSM846C23: What is total accuracy of TPSM846C23

May 13, 2019, 10:00 am
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Part Number:TPSM846C23

I am interested in total accuracy across -40C..125C internal temperature.

If I follow the data sheet correctly it would be +-1.5% for setpoint plus  +-1% temp variation plus 0.2% load  reg plus 0.05 line reg giving total :+-2.75%.

Then tolerance of external Rset resistor should be added as well.

Is my interpretation of the data sheet correct ?

Thanks

Sebastain

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BQ4050: Separate charge and discharge paths

May 13, 2019, 10:30 am
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Part Number:BQ4050

I am following the reference design TIDA-00982 (Non-Military Drone, Robot, or RC 2S1P Battery Management Solution Reference Design) to create a BMS with 3SP1 Pack using bq4050. The reference design uses a single charge and discharge paths controlled by charge and discharge FETs. But I am interested in implementing a separate charge and discharge paths as mentioned in SLUSC16B page No.15.I see from earlier posts taht there are no reference designs available in TI website.

If I create separate charge and discharge paths, what are the additional changes required in the circuit? How this can be taken care in bqStudio?

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LM53601-Q1: Minimum Dmax value to perform WCCA

May 13, 2019, 11:13 am
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Part Number:LM53601-Q1

Hello,

I am working in calculating WCCA. I am looking for minimum Dmax value.

Please advise,

Thanks,

Arun C S S

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BQ27542-G1: Making the Gauge more Accurate

May 13, 2019, 11:44 am
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Part Number:BQ27542-G1

I have a battery that is 4 Molicel 18650K batteries (Chem ID 2249) in parallel connected to my fuel gauge. I have already calibrated the fuel gauge, performed the learning cycle, created a golden image, and am now at 15 cycle counts of fully discharging and charging it. The Fuel Cell does not show that it is getting more accurate overtime, TimetoEmpty varies from 1% - 4% off ;~15 minutes to 50 minutes difference from the actual time to the TimetoEmpty value. I also always seem to get a Full Charge Capacity value in the range of 9000<x<10000 when ,I assume, it should have a value higher than 10000. I have set the battery in Data Memory as such

Charging Voltage = 4200mV

Taper Current = 500mA

Design Voltage = 3700mV

Design Capacity =  10400mAh

Charge Current = 2000mA

Discharge Current = 500mA

My goal is to have the TimetoEmpty value consistently around 0.4% or less (around 5 minutes). I am wondering if there is a setting I made a mistake on, missed when setting up the gauge, or something wrong with cycle setup on bqstudio. Is it possible for me to improve the accuracy to around 0.4% or less?

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TPS82130: Cross-Section Drawing

May 13, 2019, 12:52 pm
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Part Number:TPS82130

Hi team,

Appreciate your help for my customer inquiry as below:

I am looking for a drawing of the package (cross-section) showing the material stack up/ thickness of the materials from the top of the case until we hit the top of the die. I need this info in order to select proper ions/ energies to use for test. If you can provide this that would be much appreciated.

Regards,
Roland

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WEBENCH® Tools/LM5022: core material

May 13, 2019, 1:04 pm
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Part Number:LM5022

Tool/software: WEBENCH® Design Tools

Hi everyone

I designed a flyback converter with webench.

I have some transformer cores but I don't know what their core material are. how can I recognize what are the core material of them?

thank you

zahra

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TINA/Spice/TPS25926: Current in does not equal current out

May 13, 2019, 1:16 pm
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Part Number:TPS25926

Tool/software:TINA-TI or Spice Models

Hello Modeling Team,

My customer is using the TPS25925/6x device.  In TINA, they are seeing input current at 0A, but Iout is at load.  I have their TINA model.  Who should I work with on this?

Russell

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UC2854A: UC2854ADW

May 13, 2019, 1:26 pm
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Part Number:UC2854A

Hello,

I am using UC2854ADW for 5kW PFC Boost converter (90V-270V Input AC and 400V Output) . I am facing some issue where PFC output voltage doesn't regulate and starts to rise gradually when the converter goes from full load to no load condition. We have DC bus fault protection where it turns OFF the controller IC.

I was going thru some application notes and I found that Imout pin (Pin 5 of UC2854A) has a clamping diode to prevent voltage from going below -0.5V. 

When I connect this diode, I do not see any overshoot issue in DC bus voltage. But since every diode has junction capacitance so when I connected some low value ceramic cap (~22pF to 100pF) across it, it is also helping out. But some of the board works fine with 220pF capacitor and gives the same fault below that value.

My question is, will there be any issue if I connect 220pF cap. across Imout and GND. Will it have an effect on peak input current or power factor ? Or should I use clamp diodes, If yes, can you recommend what type of clamp diodes I can use here ?

Any suggestion will be highly appreciated.

thanks & regards,

vivek

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BQ34Z100-G1: implementing calibration on the bq34z100-G1

May 13, 2019, 1:26 pm
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Part Number:BQ34Z100-G1

This is a follow up question to this question:

https://e2e.ti.com/support/power-management/f/196/t/798421

 

I have a couple of questions about the flowchart in the bq34110 Technical ref manual linked here:

http://www.ti.com/lit/ug/sluubf7a/sluubf7a.pdf

 

In section 5.3 “Enter Calibration Mode”,  The commands to enter calibration are:

  1. I2CWriteWord(0x00, 0x002D, 100) // write sub command 0x002D CAL_ENABLE

  2. I2CWriteWord(0x00, 0x0057, 100) // write sub command 0x0057 Question 1, what is write command 0x0057? I don’t see a command 0x0057 in the bq34z100-G1 document.

  3. I2CReadBlock(0x40, 2, 100) // read 2 bytes from address 0x40 Question 2, what is read command 0x0040?

Thanks,

Doug

 

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TPS4H160-Q1: Reverse Current Protection: What sets the DGND forward voltage limit at 0.6V max and under what If condition? The diode on the EVM (BAS21-7-F) does not appear to meet this spec worst case.

May 13, 2019, 2:02 pm
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Part Number:TPS4H160-Q1

Referring to the Reverse Current Protection portion of the TPS4H160 data sheet (p.26) it says: "The reverse current protection diode in the GND network forward voltage should be less than 0.6 V in any circumstances."

Why? And at what forward current should Vf be measured? Depending on If, the diode used on the EVM (BAS21-7-F) does not meet this criteria.

Thank you!

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