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BQ40Z50: Can't identify the error source : Permanent fail, Status error ...

October 23, 2018, 2:55 am
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Part Number:BQ40Z50

Hi,

I have a battery pack including the BMS BQ40Z50. During a discharge test on an equipment, the power cut during a peak of current. Since I can communicate with but the battery no longer delivers power. The fuse on the PCB is ok.

I send several commands (FET_EN, PF_CLEAR ...) to try to unblock the situation but without succeed.

In the registers I do not see a permanent flag fail but only a flag oOCD1 of the safety status.

An idea of where this may come from and how to fix it?

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TPS22810: Thermal PDA of TPS22810

October 23, 2018, 3:09 am
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Part Number:TPS22810

Hi

Is the thermal PAD of TPS22810DRV connected to GND inside the IC?

Best regards,
Yokota
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input voltage of LM317A

October 23, 2018, 3:27 am
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We have a question about LM317A.

We change input voltage from 0V to 24V.

Please tell us the input voltage that output voltage starts to rise when we change input voltage from 0V to 24V.

Best regards,

Takahiro Nishizawa

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BQ25703A: How does the charging current change when DPM is working due to system load increased

October 23, 2018, 3:31 am
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Part Number:BQ25703A

Hi,

   As title, we test the mechanism by reduce the input voltage continuously and slowly.

  When the input voltage goes to be lower than VDMP setting, the charging current( input to a battery simulator) is changed sudenly. ( 1.3A   --> 0.7 ~0.8A)

  Can you clarify the DPM( dynamic power management) mechanism in detail?   The charging current can be reduced but in which method or algorithm?

  What is the reduce current step?  500mA, looks too much in a step.Leo

 Leo

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BQ25703A: I can't read VBAT and i can't write ChargeCurrent.

October 23, 2018, 3:33 am
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Part Number:BQ25703A


Hello,

I  am using bq25703a for the battery Charger. I manage to establish a communication between this module and the card STM32F4 .The communication is well established and I manage to write and read data in the registers of bq25703 but there are two registers I can not handle (the register 03 / 02h and the register 2D / 2A), in fact I can not write charge current  in the register 03 / 02h (it is always at zero) and I can not read VBAT from 2D / 2C register.

NOTE: I am using the EVM BQ25703AEVM-732.

Is there a specific configuration to write to bq25703a registers before writing charge current or reading VBAT?

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TPS63030: TPS63030 selection

October 23, 2018, 3:36 am
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Part Number:TPS63030

Hi team, 

I have a SMPS with output 5V(±100mV ripple, 4.9~5.1V) @ 600mA.  

Now I choose TPS63030 (buck-boost) as the latter DC/DC to get 5V output with lower ripple (±50mV) @600mA. 

It's ok to choose TPS63030, if not, do you have other recommendations? 

Thanks a lot,

Yang

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LDO that can sink current

October 23, 2018, 3:46 am
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TPS63031: Disconnect at shut down

October 23, 2018, 3:59 am
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Part Number:TPS63031

Hi,

I have a question regarding the "Load Disconnect During Shutdown" feature. Input voltage is 5V, output voltage is 3.3V. When i shut down the device Vin is 0V but the output voltage is still at 3.3V due to an external source. Can this voltage at the output during shutdown influence the input side of the converter?

Am i safe to assume that as long as EN is GND the input side can not be influenced by the output side?

"The device is put into operation when EN is set high. It is put into a shutdown mode when EN is set to GND. In shutdown mode, the regulator stops switching, all internal control circuitry is switched off, and the load is disconnected from the input."

Thank you!

BR,
Stefan

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LM5069: IC shutdown issue

October 23, 2018, 4:00 am
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Part Number:LM5069

Hi ,

We are using LM5069MM-1 for 10A inrush limit and short circuit protection. Input voltage is 24V. Nominal load is 1.5A. When the inputs supply recycling at a faster rate or some times randomly, the chip goes in shut down mode, and we have to recycle input power to restore output. How to get rid of it? There is no short circuit or UVLO, OVLO condition happening. Our Schematic is attached. Please suggest any modification required.(Please visit the site to view this file) Please suggest if any modification required. 

 Thanks

Shanoj G

System Specialist II

BTL India Pvt Ltd

Delta 1st Floor, Sigma Soft Tech Park

Whitefield, Bengaluru –560066

Karnataka, India

Office: +91 80 49698666

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BQ33100: I2C to UART converter

October 23, 2018, 4:07 am
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Part Number:BQ33100

hi all,

I need to interface BQ33100 with a UART I/F.

I couldn't find any translator to I2C.

May you advice some possible solutions?

thanks a lot in advance

KR

Vincenzo

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UCC28C41-Q1: TIDA-01505 Start-Up Waveforms at a 40V input voltage

October 23, 2018, 4:21 am
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Part Number:UCC28C41-Q1

Hi,

There is only TIDA-01505 Start-Up Waveforms  at an 800V input voltage, we need the waveforms  at a 40V input voltage, could you please provide? Thanks.

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TPS25924: eFuse as supercapacitor charger

October 23, 2018, 4:29 am
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Part Number:TPS25924

TI has documented how to use eFuse as a supercapacitor charger. (http://www.ti.com/lit/an/slva920/slva920.pdfHowever, TPS25940A has a reverse-blocking feature. A separate PMOSFET is required if we want to discharge the supercapacitor back to the VSYS.

The forward resistence is 28mΩ according to the datasheet.

The accuracy is not required here. 100% error is OK. For example, if we set it to 200mA according to calculation, 100mA min and 400mA max is accepted.

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TPS65381-Q1: TPS65381 + TMS570LS1224: JTAG connection exits while TPSDriver in Software Debug Mode

October 23, 2018, 4:33 am
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Part Number:TPS65381-Q1

We have built a custom board using the TPS65381A and the TMS570LS1224.

The board starts and JTAG connection works fine.
The TPS driver from the 2.4.0 SafeTI library is loaded in our application and called as in the example for the TMS570LS1227.
Debug output on the SCI2 Tx is working.

However when the test application reaches the AMUX tests, the JTAG connection resets.
The error console shows the following messages:

CortexR4: Error: (Error -242 @ 0x0) A router subpath could not be accessed. The board configuration file is probably incorrect. (Emulation package 8.0.803.0)
CortexR4: Trouble Halting Target CPU: (Error -2064 @ 0x0) Unable to read device status. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 8.0.803.0)
CortexR4: Error: (Error -1170 @ 0x0) Unable to access the DAP. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 8.0.803.0)

This happens even though the TPS_SetMCUSoftwareDebugMode() command has been called, so I would expect that a TPS65381A reset (e.g. due to diagnostic mode time-out) can not occur.

Any ideas or suggestions are appreciated.

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DCR010505: DCR010505 - FIT number to get to the MTBF

October 23, 2018, 4:34 am
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Part Number:DCR010505

Hello Team,

I cannot find the FIT number for the DCR010505.

Can you share it and upload in the system for future user?

Thanks,

SunSet

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LM8342: Power sequencing

October 23, 2018, 4:46 am
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Part Number:LM8342

Hi, 

What are the power sequencing requirements for the LM8342? 

Ideally to simplify the sequencing requirements for my application, I would like to provide the VDD rail first and after some time apply the AVDD rail. Is this allowed or do both rails have to be applied at the same time?

Equally, will the LM8342 initialise the DC value from the EEPROM when the 3.3V rail is applied or does it need the AVDD rail present also to do this? I'm keen to avoid any delay in the VCOM output when the AVDD rail is applied. 

Many thanks

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TPS2044B: TPS2044B 5V is applied to output Pin while no voltage at IN1 and IN2

October 23, 2018, 5:12 am
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Part Number:TPS2044B

Hi,

What happens if 5V is applied to an output pin of TPS2044B when there is no 5V applied to IN1 and IN2? Can the 5V on the outputs backfeed to IN1 and IN2 pins? Could the IC be damaged by this?

Thanks a lot!

Marcus

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BQ24753: BQ24753 can't charge the battery

October 23, 2018, 5:31 am
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Part Number:BQ24753

I design a 3 cells Li-Ion  battery charger circuits using BQ24753 ,the test result are that  the vref pin voltage is 3.3V, but the voltage is always is high of the acdrv pin in the situation of the presentation of  ac adapter


and whether the presence of battery  or not. the attachment file is the schematic

thank for your attention(Please visit the site to view this file)
(Please visit the site to view this file)



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BQ40Z50: Write SREC (SENC) to bq40XXX (hwplatform 9001, 9002, 9100, 9200)

October 23, 2018, 5:33 am
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Part Number:BQ40Z50

I am writing a program for mass production.

I need to make a quick SREC (or SENC) write to the chip.
I know that checking a ROM block's record can be done with a checksum check.

But I do not understand the algorithm for calculating the checksum.

Example:
Block =   "FF FF FF.... FF FF FF"          ( = 32* FF)
CS     =    "EB26"

Dear experts - please help.
Explain to me - how to calculate the checksum of a ROM block?

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BQ25101H: Efficiency data?

October 23, 2018, 5:42 am
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Part Number:BQ25101H

Regarding battery charger  BQ25101H, I have been measuring an efficiency of ~80% at a load of 3.7V, 100mA. I was expecting a higher efficiency of this part, I am planning to test the EVM this week to ensure it is not a layout issue.

What kind of efficiency can I expect from this device (assuming good layout/device selection) at 3.7V, 100mA? I'm hoping for >= 90%. Is that feasible?

Thank you,

Brian Angiel

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BMS

October 23, 2018, 5:42 am
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Hiii, I need a 4s lithium cell balancer with a fuel gauge (LED) integrated. As the application is for power bank I don't need any communication. The overcurrent and overvoltage protection values must be customizable. Kindly suggest me some good IC that fits my design.
Thank you.

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