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LM25119: In using LM25119 have some problem consultation.

October 18, 2018, 10:49 am
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Part Number:LM25119

Hi,

   
I have several problems in using LM25119 need help.

1.What is the maximum voltage of COMP pin?
2. What is the maximum design power of this IC?
3, how to deal with the actual uneven current of two output when used for interlacing configuration?
4. In the actual debugging, when the output continuously increases the load, the voltage of COMP pin gradually rises, no longer rises after reaching 2V. At this time, the output power is limited.How to continue to increase the output power?
5, CSG and CS pin current detection, only for overcurrent protection function?
6. How do we achieve this IC ramp compensation?
7, could you provide a handbook of common problems for the design of IC power supply for your reference?

Vin:80-130VDC
Constant voltage and constant current output
Vo:62VDC, Io:20A
Efficiency: 96%

many thanks.

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Which power cable to choose

October 18, 2018, 12:16 pm
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Hi,

I want to order a power supply for "DLP® NIRscan™ Evaluation Module" machine. Can you please kindly send me the link of the power cable required for the machine?

Regards,

Sumaiya Shomaji

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BQ24650: Shunt resistors burning

October 18, 2018, 1:17 pm
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Part Number:BQ24650

Hello team,

Please see below customer question:

Our products are currently powered up by a Lead-acid battery, and the charge controller we use is the BQ24650. We used as reference the slva437a document to use this charge controller with lead-acid batteries. However we've had some trouble with our charge controllers, some of the shunt resistors are burning even though they are oversized. Also in some cases we even have to replace the BQ24650 itself and after some minutes it burns again. 

Initially we had a 1/2 watt R17 resistor, but as this started to happen and after we analyzed the circuit we decided to change it to a 2 watt resistor

To find the shorts/hot spots we tried the test with the current limited power supply and battery or resistor in series and ran it on a burned board:

PH pin to ground has 5M ohms to ground.

SRP pin to ground has 5M ohms to ground.

D1OUT has 1M ohm to ground.  

The following image is a thermal image of the burnt board. The measured current in the battery was 20mA and the current in the power supply was 890mA

The IC reached a maximum temperature of 82 degrees Celsius, a thermal image of the same board but with a new IC is shown.

The measured current in the battery was 940mA and the current in the power supply was 890mA  

 We would appreciate your opinion on this matter and any suggestions to solve this issue would be greatly appreciated!

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LM5166: Turn off and doesn't come back without powercycle

October 18, 2018, 1:36 pm
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Part Number:LM5166

We are seeing this problem on a temperature controller we designed for off-road equipment. Could you please tell me more about the resolution to this issue? It appears only in one product that drives 2 power-fets through a microprocessor. We have not seen it in the single power-fet model. Both versions use the same board layouts. We do not populate the second power-fet on the single motor version. At first we thought it was a temperature problem. Now we are not so sure as it has happened at lower than expected temperatures. Once the lm5166 trips out It will not recover without a power cycle. The supply was designed in pwm mode with your spreadsheet tool.

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TPS3808: Reset delay Vs Timing Capacitor

October 18, 2018, 2:10 pm
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Part Number:TPS3808

We are using TPS3808G33DBVR in our product. I have following question on the reset delay.

Per datasheet the reset delay can programmed using the capacitor connected to the Pin CT.

The delay can be calculated from the following formula given in page 11 of TPS3808 (Delay =(( CTin nf)/175)+0.5mSec.

We are using 180 nf capacitor in our design to have about 1 sec delay.

Based on the above formula, the typical delay is 1.02sec.

From the table 7.3 , delay is varies between 0.7 to 1.7sec for 180nF , which is ~±40%. 

Can you clarify , is the tolerance ±40% applicable for all the values of the capacitor? Or only those specified on the table 7.3?

Thanks & Regards

Raghavendran

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BQ27441-G1: Expected Lifetime

October 18, 2018, 3:18 pm
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Part Number:BQ27441-G1

I have a client looking to design this into a product.  I would like to check what the expected service life of this part is?

Thanks,

-Kyle

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CSD95492QVM: Thermal Information

October 18, 2018, 5:00 pm
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Part Number:CSD95492QVM

What are the thermal resistances for this component (junction-to-board and junction to case top) in °C/W?

Thanks

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BQ27742-G1: How close CHG FET after Full Charge Termination Detection

October 18, 2018, 5:23 pm
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Part Number:BQ27742-G1

Hi.

When full charge termination is detected, CHG FET is opened because I set to  1 the FCFET in Pack Configuration D.

Once I remove the charge I want the BQ close the CHG FET, but that, doesn't happen.

I understood that this behavior is related to the parameters FC Set %, FC Clear %, TCA Set % and TCA Clear %. The configuration that I have for those parameters are, FC Set % = -1, FC Clear % = 98, TCA Set % = -1, TCA Clear % = 98.

The problem with not close the CHG FET when is fully charged is that I have 4.2 V in the battery but after the CHG and DSG FETs, I have 3.5~3.7 V (CHG FET is open and DSG FET is close), the voltage drop is caused by the forward diode voltage of the CHG Mosfet.

So, after a discharge and when the state of charge is less to 98%, CHG FET is closed.

I have some questions:

1. If I don't modify the configuration of the parameters mention above, how could the BQ close the CHG FET once the charge is removed? Maybe considering a minimum discharge, ¿What parameters should I configure? .

2. If I modify the configuration of  the parameters mention above, how should I configure the parameters to close the CHG FET once the charge is removed?

3. If the activation of the CHG FET is not related with the parameters mention above, what paramaters are related?, and how I should configure them to close the CHG FET once the charge is removed?

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BQ24090: BQ24090 is very hot when charging.

October 18, 2018, 5:26 pm
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Part Number:BQ24090

hi Engineer:

Use BQ24090 to charge battery 1A.

ISET uses 540 ohm resistance.

BQ24090.The chip is very hot when charging.

Can it be used for a long time?Will it affect the life of chips?

Thanks！！！

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TPS57140-Q1: Need to help to check if Vout working ok of TPS57140-Q1

October 18, 2018, 5:49 pm
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LM25119: LM25119 issue

October 18, 2018, 6:36 pm
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Part Number:LM25119

Hi, now our customer uses LM25119+ UCC27714 to design Vin: 80V-130V, Vout: 62VDC，Io:20A; Constant voltage constant current output mode ，now they meet same questions as follow and need support need ,could you help check it,tks!

1. What is the maximum voltage of the COMP pin?
2. What is the maximum power supply for this IC?
3. How to deal with the actual uneven flow of the two products when used as a staggered configuration?
4. In the actual debugging, when the output increases the load continuously, the voltage value of the COMP pin gradually rises, and does not rise after reaching 2V. At this time, the output power is limited. How to continue to increase the output power?
5. Is the CSG and CS pin current detection used only for overcurrent protection?
6. How to implement this IC ramp compensation?
7. Can you provide a copy of the FAQ manual for this IC power supply design for reference?

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LP8863-Q1: What's the purpose of D3 in SNVU558--EVM user's guide?

October 18, 2018, 6:44 pm
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 Number:LP8863-Q1

Hi Team,

     I don't know exactly the purpose of D3. Would you help to explain?

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BQ76930: BQ76930 for 5S2P applicarion

October 18, 2018, 6:58 pm
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Part Number:BQ76930

Dear Ti experts,

I have a battery pack that is 5S2P 18650 structure, and i  am looking for sutiable BMS IC that can monitor and protect every single cell.

Is it possible to use BQ76930+BQ78350-R1 for this application? or other better suggestion solution for 5S2P 18650 application?

thanks.

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UCD9090: Resequence with AUX supply

October 18, 2018, 6:59 pm
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Part Number:UCD9090

If I am powering the UCD9090 with a 3.3V aux supply that is always on, how do I get all the power rails to come back on after the main power has cycled. What I am seeing right now is 12V is the main power used to drive all the power supplies and when that gets shut down all the supplies are turned off, but when 12V turns back on, the supplies don't turn back on.

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CSD17313Q2: what's the ESD level of CSD17313Q2?

October 18, 2018, 7:37 pm
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Part Number:CSD17313Q2

Hi team,

I want to know what's the ESD level of CSD17313Q2 ? I can't find this information in datasheet?

thank you

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CSD18501Q5A: CSD18501Q5A discoloration on the leads with mold flash

October 18, 2018, 8:20 pm
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Part Number:CSD18501Q5A

For the above photos, discoloration and spotted Buildup of oxidation on the pin were found.

May i have the explanation for these? 

Thanks

Brian

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TPS63020: TPS63020DSJR VSON14

October 18, 2018, 8:33 pm
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Part Number:TPS63020

Yes.It happened in production.The schematics is below.We can't find the splink voltage in VIN.And the power is the Battery power supply.Thanks for your reply.

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BQ40Z80: BQ20Z45 Learning failed, VOK never clear

October 18, 2018, 8:40 pm
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Part Number:BQ40Z80

Is there any one can help for me?
I have done two failed learning cycle with BQ40z80,when I finshed the learning cycle and relax for a at least 12 hours  i found that VOK never clear and LStatus() is still 0x05.
1. My cell type is TOSHIBA  20Ah SCiB, I use the chemical ID 0700, is that correct?
2. I follow below step to do the learning cycle, and stop learning when failed at step9. Please see my log data attached.
Step1: Program  with correct chemical ID, correct data flash.
Step2: Calibrate the battery pack.
Step3: Discharge the battery pack to empty with C/10 (voltage down to term).
Step4: Wait 5 hours.
Step5: The [VOK] and [RDIS] bits in the IT status() register clear, GaugingStatus[REST] flag is set .
Step6: Charge pack to full with C/4 until the taper current is reached and the FC bit is set.
Step7: Let it relax for 5 hours.( Update status  05)
Step8: Discharge the pack down to term voltage with C/10.
Step9: Let it relax for 12 hours.( Update status  05,vok not clear)(Please visit the site to view this file)

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BQ40Z80: BQ20Z45 Learning failed, VOK never clear

October 18, 2018, 8:43 pm
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Part Number:BQ40Z80

(Please visit the site to view this file)

Why GPCPackaged-report  is error?

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BQ76920: Calculation of overvoltage and undervoltage

October 18, 2018, 8:48 pm
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Part Number:BQ76920

The following is the calculation formula of overpressure and underpressure in datasheet.

Only the remaining middle eight are left., is the value to write to the register.

(a) OV_TRIP_FULL = (OV – ADCOFFSET) ÷ ADCGAIN 
(b) UV_TRIP_FULL = (UV – ADCOFFSET) ÷ ADCGAIN

The following is the calculation above the reference program

#define OV_THRESH_BASE 0x2008
#define UV_THRESH_BASE 0x1000
Registers.OVTrip = (unsigned char)((((unsigned short)((OVPThreshold - Registers.ADCOffset)/Gain + 0.5) - OV_THRESH_BASE) >> 4) & 0xFF);
Registers.UVTrip = (unsigned char)((((unsigned short)((UVPThreshold - Registers.ADCOffset)/Gain + 0.5) - UV_THRESH_BASE) >> 4) & 0xFF);

The reference routine I verified is the same as moving directly to the lower 8 bits.

Registers.UVTrip = (unsigned char)((((unsigned short)((UVPThreshold - Registers.ADCOffset)/Gain)) >> 4) & 0xFF);

But it's a little bit different from this calculation at the end of the data book,I calculated it according to 4300mv and 2500mv

Read  Registers.ADCOffset=45mv     Gain=0.377

The result OV_TRIP=0xc1,This is similar to the last one in the datasheet.

But UV_TRIP=0x96, This doesn't match the  datasheet at all.

Why?and How to solve??

The following is the calculation on page 47 of the datasheet.

– The selected OV Threshold is 4.30 V. 

• Therefore, OV_TRIP should be programmed with 0xC9. 
– The selected UV Threshold is 2.5 V. 
• Therefore, UV_TRIP should be programmed with 0x1A.

 

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