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LP38693-ADJ: On power up, Vout has output even when EN signal held low.

September 16, 2018, 5:12 pm
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Part Number:LP38693-ADJ

Hi All,

== ISSUE

On power up, Vout has output around 50ms even when EN signal has been held low.

== BACKGROUND

Currently using three (3) LP38693-ADJ chips on a board, all adjusted to 1.5V output, Vin is 3.3V.

EN signal is held low on power up and driven high when the FPGA on the board has finished loading the bitstream.  This signal from Oscilloscope looks good.

However, when 3.3V is powered up, the Vout has around 50ms output voltage around 0.5V for two (2) of the chips, and one (1) of them has an output of 1.2V for 50ms.

Two (2) of the LDOs are supplying power to the FPGA IO bank, and the other one (1) is supplying power to some 1.5V to 3.3V level shifters.

Please help this issue.

Thanks,

Albert

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BQ24610: BQ24610 Charging Indicator STAT1 blinking

September 16, 2018, 6:19 pm
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Part Number:BQ24610

Hi.

In the forum saw a lot of posts, have found a charge stat1 flashing phenomenon.

In my application, using BQ24610 to charge the 2p4s battery pack, the charging process also first STAT1 led flashes, STAT2 LED lights off. (Feeling the device is charging and stopping the charging process, and with the STAT1 led flashing, programmed input current is indeed in the jump.) 

There is such a phenomenon, with a multimeter and the oscilloscope to touch the VFB,STAT1 LED lights on hold, normal charging, remove the pen, SATA1 LED lights will blink. It is also true to touch with your fingers.

The SW and VfB waveforms are charged as shown in the following figure: (Channel 1 is SW, Channel 2 is the VfB, the VfB uses an AC channel)

Vref,regn,en,pg are normal.

What is the problem caused when I don't know? It is also not possible to try and connect the capacitance (11PF,16PF,22PF,100PF,1NF) on the VfB-to-ground sampling resistor.

My English is very poor, I hope to express my understanding. This question is already very anxious for me, I need the help!

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high voltage boost converter and high voltage switcher recommendation

September 16, 2018, 7:16 pm
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Dear Sir/Madam,

Wouldl like to check if TI has any recommendation for high voltage boost converter and analog high voltage switcher with the following requirement:

high voltage boost converter IC with the following requirements:

Vin (Min):  2.8V. The main power is from coin cell type battery.

Vout (Min): 100V. If possible the output voltage is adjustable and controllable.

Iout (Min): 1.5mA.

Rise Time (Max): 1.6mSec

In addition, this high voltage will then be switched which the frequency and duty will be controlled by the host. So an analog high voltage switcher is also needed.

I use the TI power management filter tool, doesn't see have equivalent recommendation.

Best regards,

kpk

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UCD3138: [UCD3138]How to avoid illegal FW export from device

September 16, 2018, 7:34 pm
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Part Number:UCD3138

Hi all,

Good day,I'd like to know how to avoid illegal FW export from device?thanks.

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BQ25700A: BQ25700A design for 20V input for 3S or 4S battery, 100W system load

September 16, 2018, 7:37 pm
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Part Number:BQ25700A

Hi Expert

Last week I ask a E2E question that "can BQ25700A support 8A output". Thanks for your reply! becasue I can't open that question website, so I create this question!

Following is the project information: NB project for 20V/5A input (type-C), vsys need to support 100W ( 3S 12.6V/7.9A or 4S 16.8V/ 5.9A )

I saw that Joel answer that "there is a minimum of 8mOhm that can be applied as the ACN/ACP sense resistor"

I want to ask that "do we need to take care about what items when we design the circuit?"

How large the buck-boost MOSFET and inductor saturation current need to reserve?

Thanks!

BR

Bruce 

     

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TPS51220A-Q1: decoupling cap on VREF2 Pin

September 16, 2018, 10:09 pm
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Part Number:TPS51220A-Q1

Hi Team,

The TPS51220A-Q1 datasheet has denoted that the Vref2 pin should connect a 0.22uF cap to GND.

May I have your help to check that is there any side impact if the 0.22uF cap change to 1uF?

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TPS62822: FB Resister

September 16, 2018, 10:52 pm
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Part Number:TPS62822

Hi, Team,

In the datasheet 9.2.2, it is recommended that the current value of the FB circuit is around 5μA. For 1.8 V, a customer would like to use the below value. Since the IC inflow current of FB is described as 10 nA, it means that the output voltage drops by about 0.2%. The resistance value of the capacitor of CNF also becomes 1/10, so they plans to change capacitor 120PF ⇒ 1000PF. If there any concern with the above setting?

FB/GND 10kohm
FB/Vout 20kohm

Best Regards,
Satoshi Yone

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Best fit PMIC or Multi output DCDC/LDO for Satixfy SX3000 chipset.

September 16, 2018, 11:02 pm
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Hi All,

I am currently working on a design with a chipset from Satixfy -SX3000. I do not have proper power numbers yet from the manufacturer. Also I am trying to realize the design in a customized mPCIe form factor (3.7V@2.5A and 1.8V@1.5A - available from base board through mPCIe connector).

Anyone have any idea on which chipset from TI would be best fit for this requirement?

Thanks,

Naveenkumar.R

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UCC2897: Is there any SIMPLIS model for ucc2897a?

September 16, 2018, 11:14 pm
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BQ40Z60EVM-578: Battery not charging when a voltage supply above 20V is used

September 16, 2018, 11:39 pm
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Part Number:BQ40Z60EVM-578

Hello,

I need to use the BQ40Z60EVM-578 with a 24V voltage supply but it seems the battery is not charging when I use more than 20V. What do I need to do? 

Thank you.

Have a nice day.

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TPS3431-Q1: TPS3431 EN Internal PULL UP Resistor.

September 16, 2018, 11:49 pm
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TPS62097: TPS62097 Pre-Bias Start-Up?

September 17, 2018, 12:01 am
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Part Number:TPS62097

Hi,

The TPS62097 web page says that this device is capable of  Pre-Bias Start-Up. The data sheet says nothing. So which is it?

Does the TPS62097-Q1 support Pre-Bias Start-Up?

Best regards

Torbjörn

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BQ27441-G1: BQ27441-G1

September 17, 2018, 12:17 am
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Part Number:BQ27441-G1

Hi, 

I can't set SOC1 Set Threshold for BQ27441-G1. Read of SOC1 Set Threshold always return 0x40. Any other registers read and set without problem. I test 3 chip and got same result.

How can I set  SOC1 Set Threshold?

Thanks

Gregory

 

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BQ25703A: we need demo register configuration list

September 17, 2018, 12:21 am
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Part Number:BQ25703A

Dears,

we use BQ25703A for LI battery 3 in series charger, adapter input voltage is 12V,Pls help to check whether can support us a DEMO board's full  register configuration list,then we can easily to config the register.

Many thanks!

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LM5050-1: GATE control circuit question

September 17, 2018, 12:31 am
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Part Number:LM5050-1

Hi expert,

My customer is asking for below circuit operation. We can know 2A MOSFET is for two conditions to tie GATE and SOURCE together, one is OFF pin is high and one is reverse current occurred. But for 35uA/30uA/30mV/two BJTs, may we know how it work for below circuit? Thanks a lot!!

Best regards,

Ann Lien

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TLC5957: LOD(LED Open Detection) function for TLC5957

September 17, 2018, 12:52 am
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Part Number:TLC5957

I composed passive matrix driving system with TLC5957.

My panel board has passive matrix type LED arrays.

One of LED arrays has LED open cell. (And catapillar was not removed yet even though I have used TLC5957.)

As far as I know, During driving time, TLC5957 detect LED open cell automatically.

After TLC5957 detect open cell, Does TLC5957 do not give a output current on output pin? 

I mean that Is output current zero automatically whenever output pin meets open cell during driving period.

How can I know this LOD function is operating accurately. 

Is there any signal(sign) at the internal register? 

Then which part of internal register should I check out?

Or LOD function is just operated  as a display panel factory's initial mode?

If then, LOD detection function is maybe needed more circuit such as FPGA chip and memory chip etc..right?

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WEBENCH® Tools/TPS62810-Q1: TPS62810-Q1

September 17, 2018, 12:55 am
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Part Number:TPS62810-Q1

Tool/software: WEBENCH® Design Tools

Hi,

             there is overshoot and undershoot ringing in the pwm output of  ic TPS62810-Q1. i am using it as 3.3v to 1 volt  buck convertor. although there is no problem in output it exact 1 volt with limited ripple. i am attaching the image of pwm with overshoot and undershoot ringing shown in the white circle. this image not of my converter TPS62810-Q1 but  same  distortion is generating in the  TPS62810-Q1 dc to dc. please sugest me exact problem behind it.

PFA,

Regards,

jitendra kumar rana

Lead engineer, Samsung

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BQ27510-G3: At the end of discharge, TTE decrease slowly

September 17, 2018, 12:56 am
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Part Number:BQ27510-G3

Hello,

After performing the golden image, i check the SOC and the TTE on the product

Every 10 sec, I read the TTE and SOC.

During the discharge, the TTE is acceptable and follow a straight line during 8 hours. The TTE decrease every minute. It is OK

But for the last 5 minutes the TTE decrease very slowly.

TTE = 5 during 1min30sec

TTE = 4 during 1min30sec

TTE = 3 during 2min0sec

TTE = 2 during 4min10sec

TTE = 1 during 6min20sec

Please find curve for the voltage, current, TTE and SOC during charge and discharge

Please find the log during the last 5 minutes

13/09/2018 20:03
Temp Voltage FCC Current TTE_Coef_1 Cycles SOC
315 3392 7062 -853 5 14 2                TTE = 5 during 1min30sec
315 3392 7062 -853 5 14 2
315 3391 7062 -853 5 14 2
315 3391 7062 -853 5 14 2
315 3390 7062 -853 5 14 1
315 3390 7062 -853 5 14 1
315 3390 7062 -853 5 14 1
315 3390 7062 -853 5 14 1
315 3390 7062 -854 5 14 1
315 3390 7062 -854 4 14 1                TTE = 4 during 1min30sec
315 3389 7062 -854 4 14 1
315 3389 7062 -854 4 14 1
315 3389 7062 -854 4 14 1
315 3388 7062 -854 4 14 1
315 3387 7062 -854 4 14 1
315 3388 7062 -854 4 14 1
315 3387 7062 -854 4 14 1
315 3387 7062 -854 4 14 1
315 3387 7062 -854 3 14 1                TTE = 3 during 2min0sec
315 3386 7062 -854 3 14 1
315 3386 7062 -855 3 14 1
315 3386 7062 -855 3 14 1
315 3385 7062 -855 3 14 1
315 3385 7062 -855 3 14 1
315 3384 7062 -855 3 14 1
315 3384 7062 -855 3 14 1
315 3384 7062 -855 3 14 1
315 3383 7062 -855 3 14 1
315 3383 7062 -855 3 14 1
315 3382 7062 -855 3 14 1
315 3382 7062 -855 2 14 1                TTE = 2 during 4min10sec
315 3382 7062 -855 2 14 1
315 3381 7062 -856 2 14 1
315 3381 7062 -856 2 14 1
315 3381 7062 -856 2 14 1
315 3380 7062 -856 2 14 1
315 3379 7062 -856 2 14 1
315 3379 7062 -856 2 14 1
315 3378 7062 -856 2 14 1
315 3378 7062 -856 2 14 1
315 3378 7062 -857 2 14 1
315 3377 7062 -857 2 14 1
315 3376 7062 -857 2 14 1
315 3377 7062 -857 2 14 1
315 3375 7062 -857 2 14 1
315 3375 7062 -857 2 14 1
315 3375 7062 -857 2 14 1
315 3374 7062 -857 2 14 1
315 3368 7062 -905 2 14 1
315 3373 7062 -857 2 14 1
315 3372 7062 -858 2 14 1
315 3372 7062 -858 2 14 1
315 3371 7062 -858 2 14 1
315 3370 7062 -858 2 14 1
315 3369 7062 -858 2 14 1
315 3369 7062 -858 1 14 1                TTE = 1 during 6min20sec
315 3369 7062 -859 1 14 1
315 3368 7062 -858 1 14 1
315 3367 7062 -859 1 14 1
315 3366 7062 -859 1 14 1
315 3366 7062 -899 1 14 1
315 3365 7062 -860 1 14 1
315 3364 7062 -860 1 14 1
315 3363 7062 -860 1 14 1
315 3362 7062 -861 1 14 1
315 3361 7062 -861 1 14 1
315 3361 7062 -861 1 14 1
315 3359 7062 -861 1 14 1
315 3358 7062 -861 1 14 1
315 3357 7062 -861 1 14 1
315 3357 7062 -861 1 14 1
315 3356 7062 -862 1 14 1
315 3355 7062 -862 1 14 1
315 3354 7062 -863 1 14 1
315 3353 7062 -863 1 14 1
315 3352 7062 -863 1 14 1
315 3351 7062 -863 1 14 1
315 3350 7062 -864 1 14 1
315 3348 7062 -864 1 14 1
315 3347 7062 -864 1 14 1
315 3346 7062 -864 1 14 1
315 3345 7062 -865 1 14 1
315 3344 7062 -864 1 14 1
315 3342 7062 -865 1 14 1
316 3341 7062 -865 1 14 1
315 3340 7062 -866 1 14 1
315 3338 7062 -867 1 14 1
316 3337 7062 -867 1 14 1
316 3336 7062 -868 1 14 1
316 3334 7062 -867 1 14 1
316 3333 7062 -868 1 14 1
316 3332 7062 -868 1 14 1
316 3330 7062 -869 1 14 1
316 3330 7062 -859 0 14 1
316 3328 7062 -860 0 14 1

What are the parameters to adjust to have a TTE that decreases correctly if it is possible ?

It is possible to do better ? If yes how ?

Thanks and Best Regard

Stéphane

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UCD9090A: additional I2C address issue

September 17, 2018, 1:00 am
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Part Number:UCD9090A

We set I2C address of UCD9090A to 0x34, however we saw two additional I2C address(0x0C and 0x7F) on this bus as well, are the two additional address from UCD9090A device?

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BQ27510-G3: At the end of discharge, TTE decrease slowly

September 17, 2018, 1:03 am
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