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BQ76940: OCD and SCD setting

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Part Number: BQ76940

Hello, 

we are using BQ76940 along with BQ78350-R1 in our design, our BMS requires to operate at high Charge and Discharge Currents, but the BQ78350-R1 is allowing to set OCD to 30A max where as we need to operate up to 500A Max will the current sensor in AFE supports the current rate  or should we change for external current sensor.

if AFE BQ76940 supports should we do any changes in the configuration of the Companion Controller BQ78350-R1

Kindly Suggest


UCC28730-Q1: Pspice transient model provided in TI website was not giving the expected output.

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Part Number: UCC28730-Q1

Hi,

  I have tried the simulation file of UCC28730 available from TI website using Pspice V16 . After 1.09msec, the pulse from DRV pin stops. So that the output is not reaching the expected value.

please find the attached snapshot of simulated output in Pspice.

If you need any further information, let us know

TPS61291: Buck-Boost OR Boost Bypass DC DC Regulator

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Part Number: TPS61291

Hi,

1. I have an application where I need to supply(controller) 3.3V and min is 3V and using LiMnO2 CR2477 Coin Battery which rated 3.3V,1000mAh.

My load may take max of 200mA but in the Data sheet they have clearly mentioned that Supply shout be able to provide max of 1A.

have checked these two TPS61291 OR TPS61099 as both are boost latter without bypass mode. But unfortunately I'll not be able to use both of these are rated for 200/250mA.

Do you recommend any other part number with max load current above or equal to 1A with bypass / Buck-boost.

2. We might change the battery to other Li Ion (may be cobalt) which full charged will have 4.2V and has to maintain 3.3V So in this case Boost with bypass won't be helpful. Is the Buck-Boost is the only way to achieve this?

Looking forward to your answer.

Thanks.

Lakshminarayana K N.

UCC27714: Noise in output and input driver pulses at 250V

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Part Number: UCC27714

Hello,

I am using ucc27714 as mosfet driver.  At voltage above 150V there are significant noise generated in current waveform and those noise can be seen in input gate pulses generated by driver.

How can i eliminate these noise?

I am using snubber circuit of 10nF and  1E ohm but still noise can be seen in input as well as output gate pulses.

BQ35100: BQ35100 battery characterization

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Part Number: BQ35100

Dear all,

To use BQ35100 in LiSoCl2 battery gauging, how to get the characterization of the battery?

Thanks.

BQ24780S: How to clear PROCHOT event?

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Part Number: BQ24780S

Hi,

We’re testing BQ24780S PROCHOT function with setting as below.

  • 0x3A=0x1 (Only ACOK function is enabled.)
  • 0x3C=0x8A74
    • REG0x3C[5](EN_PROCHOT_EXT) is ‘1’

When we remove adapter from the board, ACOK become low and PROCHOT is triggered (at low level). We tried to clear PROCHOT by writing 0x3C[2] (PROCJOT_CLEAR) to ‘0’, but PROCHOT is still low. I assume that PROCHOT will be cleared (back to high level) after writing a ‘0’ to 0x3C[2], but it seems not true. Please suggest how to clear PROCHOT back to high level when the PROCHOT event is still active.

Meanwhile, if REG0x3C[5](EN_PROCHOT_EXT) is ‘0’, there's no way to get PROCHOT pin back to high level as long as the PROCHOT event is still active, right?

 

Thanks!

Antony

 

 

TPS2561: overcurrent condition

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Part Number: TPS2561

Hi Sirs,

Sorry to bother you.

We would like to know the overcurrent condition of TPS2561
The timing of signal pull low can be adjusted values from RFAULT and CRETRY in the figureA below?

Because our USB hub is minimum 8ms pull signal length required.
Then return the overcurrent to the SOC

Thanks!!

TPS61178: minimum load for the TPS61178

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Part Number: TPS61178

Hi,I try to deign the Boost converter , Is TPS61178  can operate in light load -100uA ? 

Thank you


UCC28180: PSPICE model to be used by Altium Designer

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Part Number: UCC28180

Hello,

I was trying to use altium designer to simulate the UCC28180 given its PSPICE model on the Website of TI. However and after several Trials, the avg.sim file isn't accepted by altium. Is there a solution for that please?

The model of UCC28180 can also be found in Tina-TI. When one Right clicks on it then "enter macro" one can reach to the netlist then save it to a Format suitable for Altium e.g. ".ckt or .cir". However, the netlist file includes this sentence "* Encrypted macro. Content can't be viewed". Does this mean that the macro is still inside the saved file .cir and functioning but only can be read by the Simulator e.g. Altium or SIMPLIS or anyother?

Thank you very much in advance

BQ4050: BQ4050 ESD CAP

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Part Number: BQ4050

Hi Team,

Could you please explain how the C1 and C2 help protect the FETs during an ESD event? Thx. 

BQ4050: BQ4050 various issues

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Part Number: BQ4050

Hi

I am working on a design that includes a BQ4050 and BQ25703A to provide power and charging to the system. They are to be controlled by a TPS65987, in a similar setup to TIDA-01515.

At the moment though I am trying to set the BQ4050 up but it seems to be responding strangely. I have the BQ25703A doing what I expect.

I am communicating with it via a microcontroller at the moment, which is connected to both the BQ4050 and BQ25703A. As far as I can tell the comms seem to be OK. I have checked with a scope and a logic analyser and all I2C/SMBus signals seem to be correct. I am able to read the registers but they are not all as expected. For instance the cell voltage 4 (0x3C) is always 0, whereas the cell voltage 1, 2 & 3 read correctly. Also the voltage (0x08) is always 2V.

Additionally, I am unable to charge the pack. I can set the BQ25703A up with a charge current and the default charge voltage (16.8V) but it seems the BQ4050 is not opening its charge FET as the pack voltage remains at 14.3V. I measure 5V on the charge FET gate, but the discharge FET has 13V going to its gate. Both are well over the on threshold (1.8V) of the FETs I'm using (CSD17308).

My question is, are there are basic configuration steps I need to take to set the BQ4050 up to work with 4 cells? I am not using BQ studio as I don't have a EV2400. I'm guessing that to write the settings to the registers, I will need to implement a CRC algorithm for the PEC. For the register reads that I have done so far, the BQ4050 has done this.

I can program the BQ4050 initially from a microcontroller but during running I want to have the communication to the BQ4050 coming from the TPS65987. The only regular piece of information I want to get from the BQ4050 is the relative state of charge (0x0D).

Another question is, will I be able to use the TPS65987 to read the relative state of charge from the BQ4050 on the TPS65987 I2C1 lines, then have the microcontroller read that value from the TPS65987 on the I2C2 lines.

I have attached the schematic that I am using for the BQ4050 and BQ25703A, which are mainly based on the TIDA-01515 schematic.

Thanks(Please visit the site to view this file)(Please visit the site to view this file)

UCC28911: faulty Xcel calc tool ?

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Part Number: UCC28911

1. The Xcel calculator tool states that Macros are to be enabled; but I dont see any Macros in the calc tool when I open it, so is this a false statement or did the Xcel tool load improperly?

2. I am suspicious because the tool isn't working properly; I see the switch freq changing when I change 'Lp', but not much else is changing or making much sense. Changing the 'Ripk' value seems to have no effect on any operating parameters which cant be right.

BQ40Z80: Using the device as a power switch

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Part Number: BQ40Z80

Hello!

I recently posted a question asking if I could use one of the configurable GPIO pins to use the bq40z80 as a switch (using the bq40z80 as an INPUT).  That wasn't possible.  Perhaps I was asking the wrong question though..

The bq40z80 controls N-channel CHG and DSG FETs as a way to protect from over-charge and over-discharge.  I should be able to use the bq40z80 to turn the CHG and DSG FETs on and off at my own will, to act as a power switch.

Can you recommend the best way to do this?

Perhaps by use of the 'Emergency Shutdown' feature?   Found in the technical reference manual in section 6.6

 


Thanks!

-Chris

UCC28780: The customer wants to make a small volume adapter with output power of 180W, GaN

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Part Number: UCC28780

Hi;

      The customer wants to make a small volume adapter with output power of 180W,

and apply GaN technology. It is recommended whether the application program is suitable.

thank you

LM5143DESIGN-CALC: Design Calculator password to unlock and view all cell values?

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Part Number: LM5143DESIGN-CALC

Hello Team,

Can i get the password to unlock the LM5143 Design Calculator. We would like to access each individual cell so that a macro can be written to manipulate the cells from a Matchcad file but to do this we need access to edit the cells not just input a value. We would also like to verify what equations are used to calculate the input/output caps and inductor as it seems to not match the datasheet. Thank you!


BQ25887: Overcharge and discharge protection?

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Part Number: BQ25887

Hi,

The BQ25887 looks like a great charger for 2S batteries. It is not clear to me if it stops charging once the cells reach their target voltage--is there overcharge protection in this or discharge protection?

Thanks,

JD

BQ40Z80: Debounce delay on Emergency FET SHUTDN pin

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Part Number: BQ40Z80

Hello,

I am hoping that I can configure the debounce delay within the Data Memory section of the bq40z80.

This is in regards to the Emergency FET SHUTDN pin that I am using as an ON/OFF switch for system power.  As it stands, the pin has a built in 1 second debounce delay.  (i.e. hold down a momentary push button for 1 second to change the entry or exit of shutdown).  I would like to change this to 3 seconds if possible.   

Is this something that can be configured?

Thank you!

-Chris

BQ24600: Circiut charge with much lower current than is set

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Part Number: BQ24600

Hello, 

I am using this part in my schematic:

I try to charge my 3S li-ion pack, so i set resistors to 12,6 V and 2A charging. When i connect my battery pack, the VFB is 1700 mV, Thermistor voltage is 1800 mV, Iset voltage is 925 mV, everything look good, but my charging current is only 0,3A.

I don't know where could be the problem. 

dbarvik

UCC3809-2: Transformer for 10-Watt Flyback Converter Using the UCC3809 (SLUU087B)

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Part Number: UCC3809-2

Hello,

I am trying to implement the 10W flyback design from the TI application note SLUU087B, being that this is an older guide the transformer is no longer in production. The Pulse transformer used is a 15uH, RM5, 3F3 and has a PN: PB0028NL. Pulse gave me an alternative transformer the PA1276NL. The primary inductance on this transformer (155uH) is much higher than PB0028NL. Would this transformer work in place of the PB0028NL in the SLUU087B design? 


https://www.mouser.com/datasheet/2/405/sluu087b-124381.pdf (application note)
https://products.pulseelex.com/files/product_files/P675.pdf (Pulse alternative transformer) 

BQ25120A: Using MCU as load and host

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Part Number: BQ25120A

I am trying to create a wearable device that is controlled by a MSP430FR2476 and I am trying to use the BQ25120A as the regulator for the circuit. From what I understand, the BQ25120A gives an output of 1.8V by default. This will work for the MSP430 but all of my other components require 3.3V. I am wondering if I can use the MSP430 as the host and change the output voltage to 3.3V on the fly. I am worried that using the MSP430 as both the host and load may cause issues with the MSP430. Any advice on how I can go about getting 3.3V out of the BQ25120A to power my circuit? Ideally there would be a way to program the default output voltage to 3.3V, but I think this is not possible with this part. 

To be clear, I plan on connecting the MSP430 as the Load (LS/LDO) and as the HOST (I2C) on the diagram below. I am also curious to know how I can connect the MSP430 to the SYS pin or if I even need to. 

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