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TPS92610-Q1: About TPS92610-Q1 FAULT pin status

October 23, 2018, 5:56 am
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Part Number:TPS92610-Q1

Hello Team,

Please help us to recommended voltage level on FAULT pin of TPS92610, since we need to have high to low level for BCM, thanks.

1. The fault pin folating.

2. The fault pin connect cap to the ground.

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BMS

October 23, 2018, 5:56 am
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Hiii, I need a 4s lithium battery balancing ic with an integrated fuel gauge (LED). As the application is for a power bank I don't need any communication. But the overvoltage and overcurrent protection values are needed to be customizable. Kindly suggest me some ic that suits my design.
Thank you

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TPS542941: PG pin of RSA Package : Quick response is required

October 23, 2018, 5:59 am
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Part Number:TPS542941

Hi team,

I'm an FAE supporting some industrial companies in Japan.

My customer will employ TPS542941 and they provided a question.

Is PG pin available in RSA package?

The reason why ask you this is that although RSA package pin-out shows PG1 and PG2, pin functions shows just ー.

What does this mean?

Since the customer has started design, quick reply is required.

I would appreciate your cooperation beforehand.

Best regards,

Shota Mago

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TPS54531: regulator behaviour when Vin below the Vout set point

October 23, 2018, 6:06 am
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Part Number:TPS54531

Hi team,

in tps54531 datasheet, i found below description.

i believe it means when the input voltage below the Vout set point(for example, the Vout set point is 12V, and the input is 11V. The actual output is less than 11V), the TPS54531 will work in 100% duty cycle for some cycles. Then the high side MOS turn off and low side MOS turn on to charge the boot CAP. So it is similar to decrease the switching frequency on some level(decrease the frequency of charing boot cap). 

To improve drop out, the TPS54531 device is designed to operate at 100% duty cycle as long as the
BOOT-to-PH pin voltage is greater than 2.1 V (typical)

The ''low frequency'' means the device has slow transient response. Do we have other device which have max fixed duty and charge the boot cap in every cycle? Thanks.

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TLC5927: More than 16-channels Constatnt current LED sink Driver

October 23, 2018, 6:09 am
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Part Number:TLC5927

Dear TI,

I am using now your TLC5927 Driver but for new project I have to drive 400 LEDs and PCB need to be small. Can you please recommend an IC Driver with more than 16-channels,around 50mA pro channel, with SPI Interface and small footprint/package.

Tanks a lot

BR

Marcin

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TPS54540: regulator behaviour when Vin below the Vout set point

October 23, 2018, 6:11 am
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Part Number:TPS54540

in tps54540 datasheet, i found below description.

When operating with a low voltage difference from input to output, the high side MOSFET of the TPS54540 will
operate at 100% duty cycle as long as the BOOT to SW terminal voltage is greater than 2.1V. When the voltage
from BOOT to SW drops below 2.1V, the high side MOSFET is turned off and an integrated low side MOSFET
pulls SW low to recharge the BOOT capacitor. 

i believe it means when the input voltage below the Vout set point(for example, the Vout set point is 12V, and the input is 11V. The actual output is less than 11V), the TPS54540 will work in 100% duty cycle for some cycles. Then the high side MOS turn off and low side MOS turn on to charge the boot CAP. So it is similar to decrease the switching frequency on some level(decrease the frequency of charing boot cap). 

The ''low frequency'' means the device has slow transient response. Do we have other device which have max fixed duty and charge the boot cap in every cycle?

Vin=28~30V, Vout=26~28V, Iout=3A

Thanks.

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TPS2051B: EN When output is already pulled high

October 23, 2018, 6:33 am
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Part Number:TPS2051B

Hi Team,

Quick question on the TPS2051B. Will this device trigger it’s overcurrent protection If the Vout side is non-zero when enabled? We have a design where the EN switch is enabled but the output seems stuck at 2.8V (unless I short EN high so it comes up immediately, where Vout then rises to 3.3v).

Appreciate any feedback you can provide! Thank you!

Regards,

Ramon

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TPS65400: onboard flash memory retention time.

October 23, 2018, 6:34 am
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Part Number:TPS65400

Hello:

Our design incorporates the TPS65400 PMIC.  The flash memory will be programmed before starting up the board.  There is no link for the MCU to modify the flash.

The operation of our board is critically dependent on startup sequence programming retained in flash.

The data sheet does not mention anything about long-term data retention in the flash. 

What data retention performance can we expect?  How much will retention time be reduced by elevated temperatures?

Regards,

Bob

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TPS22990: search for the power down sequence control load switch

October 23, 2018, 6:43 am
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Part Number:TPS22990

Hi, 

Because our customer need to control the power sequence during power off. 

I wanna if we have this kind of solution. 

Thanks for your help.

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BQ25703A: Replace input and output current sense resistors for higher currents

October 23, 2018, 6:47 am
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Part Number:BQ25703A

Hi,

We are using BQ25703A in order to charge 4S11P lithium-ion battery pack.
Currently the input source is an 80W solar panel (Vmp=17.7V, Imp=4.52A) and it is working fine.
In the datasheet the recommended input current sense resistor is 10mOhm - up to 6400mA input charge current.
We are wondering if we can replace the input current sense resistor to a small value like 5mOhm so we can use higher current input source (bigger solar panel).
(Same question on the battery charge current sense)

BTW, if it can be done we will replace the mosfets and inductor to fit to the new design.

Thanks,

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UCC28070: Use ucc28070 in bridgeless PFC

October 23, 2018, 6:53 am
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Part Number:UCC28070

I want to build an interleaved CCM bridgeless PFC shown in the figure. 

but I don't know how to sense the input ac voltage.  Because the neutral line is connected to GND in the positive line cycle, but it is connected to the Vo in the negative line cycle. 

So conventional resistor divide method can't be used directly. Maybe resistor divide method with rectified diode bridge can't be used neither. 

I don't have a good idea now. could you pls help me?  thanks!!!

 

 

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TPS2493: search for hot swap controller with reverse polarity protection

October 23, 2018, 6:59 am
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Part Number:TPS2493

Hi, 

My customer is looking for the hot swap controller or the input OC, OV, UV protector with reverse polarity protection. 

Can you help to let us know if there are proper solution? 

Thanks for your help.

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BQ25601: Charging 1s3p 18650 battery

October 23, 2018, 6:31 am
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Part Number:BQ25601

I see problems with some chargers in order to charge 3 large capacity cells in parallel.

Will this charge be able to do so?

And what could be the reason for some chargers not to work?

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LM3410: PWM frequency variation on DIM pin of the regulator

October 23, 2018, 7:29 am
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Part Number:LM3410

Hi,

Currently i am using LM3410XQMF/NOPB regulator  for LCD backlight driver

This regulator has a DIM pin for which we have connected PWM signal to control the brightness of the LCD.In the datasheet paragraph 7.3.2 Dim Pin and Shutdown Mode its specified that the PWM frequencies from 1Hz to 25KHz can be used.

Now my concern is that whether can I provide higher PWM frequency(for example 50KHz) to the DIM pin?

Will there be any adverse effects on the IC or on the LCD if I increase the PWM frequency?

Please suggest 

Regards,
Karthik

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BQ34110: Flash programming robustness

October 23, 2018, 7:37 am
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Part Number:BQ34110

I'm designing a system with BQ34110 and external flash.

Update of firmware (*.bq.fs file) and data (*.df.fs file) is planned to be made with FlashStream Parser from a onboard IC.

Q1: What will happen if power interrupt occur during flash writing?

Will the BQ34110 restart in a boot-state, waiting to continue the programing session? How to detect?

Q2: What if transferred data is corrupted? I.e. one (or several) data block(s) transferred with NOK CRC.

How to detect and how to recover from a transfer of an corrupted file?

BR / Urban

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LM3658 usage

October 23, 2018, 7:43 am
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1. I read the data sheet, but I didn't understand LM3658SD/NOPB, LM3658SD-A/NOPB, LM3658SD-B/NOPB. Can you briefly describe the difference and how to apply it?

2. I designed the LM3658SD/NOPB, but the delivery time is longer. I can use LM3658SD-A/NOPB directly. Can I replace it with pin to pin?

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TPS4H000-Q1: Can I common up the FAULT pins?

October 23, 2018, 7:46 am
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Part Number:TPS4H000-Q1

Hello,
I am planning to use 3 or 5 TPS4H000-Q1 to control and monitor the power supply of between 5 and 18 devices.

Can I common up (connect together) all 3/5 FAULT pins (Pin_07)?

Also ....
Can I common up (connect together) all 3/5 THER pins (Pin_12)?

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BQ25703AEVM-732: read battry voltage using bq25703a

October 23, 2018, 7:55 am
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Part Number:BQ25703AEVM-732

Hello, 

I  am using bq25703a for the battery Charger. I manage to establish a communication between this module and the card STM32F4 .

my question is :Can i determine the voltage value of the battery with the bq25703a.

Thank you .

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ULQ2003A-Q1: could ULQ2003A-Q1 be used in 24V automotive system? is there a success story?

October 23, 2018, 8:05 am
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BQ40Z50-R1: reprogramming bq40z50-R1

October 23, 2018, 8:21 am
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Part Number:BQ40Z50-R1

Another question on reprogramming existing PCBAs:

I recall that in older gas gauges (e.g. bq20z90) there would exist in the data flash certain "hidden" values that could not be cleared out by simply overwriting the .gg file.  Now that I am trying to reprogram the bq40z50-R1, will I have a similar problem with the DF retaining existing values from the previous operation if I overwrite the .gg.csv file.  Or would it be better to completely rewrite the entire .srec file and then recalibrate the battery?

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