Quantcast
Channel: Power management forum - Recent Threads
Viewing all 35901 articles
Browse latest View live
↧

LMR62014: Feed forward capacitor value

April 23, 2019, 10:55 pm
$
0
0

Part Number:LMR62014

Hi Team,

One of my customers is using LMR62014 to make 16V  from 5V in energy meter application.The load is around 100mA for 20-50msec.

He is presently using 220pf as feedforward capacitor but is failing in radiated emission test .

If the value of Cff is increased from 220pf to 440pf the radiated emission result passes.

As the PCB is freezed The layout can not be changed.

There are two queries:

1. How feedforward capacitor is resulting in less Radiated emissions?

2. Is it ok to use 440pF in the design?What implications it can have?

Regards,

Harmeet

↧
Search

WEBENCH® Tools/TPS40170: Calculation error for Duty cycle

April 23, 2019, 11:11 pm
$
0
0

Part Number:TPS40170

Tool/software: WEBENCH® Design Tools

I could not simulate TPS40170 for the reason of calculated Duty cycle error, please see below;

Is there update schedule for improve ?

I want to use classic webench because require to customize compensation network.

Best regards,

Satoshi

↧
↧

BQ79606-Q1: BQ79606-Q1

April 23, 2019, 11:11 pm
$
0
0

Part Number:BQ79606-Q1

Hi

How much time will the AFE take to measure 6 six cell voltages??

↧

TPS60250: Increase LED Load (in parallel)

April 23, 2019, 11:20 pm
$
0
0

Part Number:TPS60250

Dear Sir/Ms.

Is it possible to output 4 channels in parallel, which can provide 0-100mA dimming drive?

Best Regards,

Kami Huang

↧

CCS/UCD3138: Why the value after DATA FLASH CHECKSUM would be erased?How to compare the checksum if DFLASH needs to be erased？

April 23, 2019, 11:23 pm
$
0
0

Part Number:UCD3138

Tool/software: Code Composer Studio

Hello，

I look through the constants.c in HSFB firmware.And I notice the code as below:

//  ------------- DATA FLASH CHECKSUM  -------------
#pragma DATA_SECTION(pmbus_checksum, ".CONFIG");
volatile const Uint32 pmbus_checksum = 0x87654321;

#pragma DATA_SECTION(pmbus_checksum_b, ".CONFIG_B");
volatile const Uint32 pmbus_checksum_b;

If i write code after that like this:

#pragma DATA_SECTION(hly_set, ".HLY")
volatile const  un_hly hly_set = Z;// Z is constant

The location of ".HLY"(org = 0x00018FA0) is after ".CONFIG" in DFLASH.

However,the Z may be erased while the value before CHECKSUM not.

Could you give me some advices?

Thanks!

↧
↧

TPS51200: Behavior when REFIN is over 1.8V

April 23, 2019, 11:37 pm
$
0
0

Part Number:TPS51200

Hello,

 

My customer has an question about TPS51200.

They want to input 1.8V to REFIN input pin.

But since the recommended operating range is up to 1.8V, there is basically no margin for 1.8v REFIN input.

What kind of problem could occur if REFIN input is over 1.8V.

 

They understand we can’t guarantee any operation if the recommended operating range is not kept.

But what they want to confirm is whether this device could have something very strange of non-linear behavior.

 

Regards,

Oba

↧

UCC27524A1-Q1: Unexpected ringing on the gate drive output

April 23, 2019, 11:42 pm
$
0
0

Part Number:UCC27524A1-Q1

Hi team,

An unexpected ringing is observed on the gate driver output with UCC27524A1-Q1.
As the FET drain voltage(HV) is hiked higher, the ringing looks to be generated as the attached waveform.
1) Is there any idea what possibly makes this ringing?
2) Is there any idea of workaround to suppress the ringing?

Thanks in advance.
S.Sawamoto

↧

UCC27523: UCC27523 USING PROBLEM

April 23, 2019, 11:57 pm
$
0
0

Part Number:UCC27523

Hi all,

one of my customers has one  problem about UCC27523，and it follows as below:

UCC27523 can not output high level, and the output voltage is lower than -2V. whether this can cause damage to the chip ? and what is the main reason which can cause no high level output disability?

Thanks a lot!

↧
Search

BQ40Z50: bq40z50 PF Status represent

April 24, 2019, 12:22 am
$
0
0

Part Number:BQ40Z50

Hi TI members,

Could you summarize what the values represent ? 

PF StatusDevice Status DataFuse Flag3672
PF StatusDevice Gauging DataCell 1 Dod016315
PF StatusDevice Gauging DataCell 2 Dod010726
Thanks
Blue
↧
↧

BQ24610: BQ24610 control pin when no load

April 24, 2019, 12:24 am
$
0
0

Part Number:BQ24610

Hello,

      my project is used in DC input 15V, charging is full of 12.6V charging circuit, I have two doubts, the first when I am empty, my two different items of boards HIDRV and LODRV and PH feet The switching frequency is different. The following is the waveform intercepted by the oscilloscope in my test. The second doubt is that the battery voltage I set is 12.6V, but the battery voltage I am full is 12.5. I have read the specifications and specifications of BQ24610. The 0.5% of the scale is a bit wrong. Can you give me the answer?

↧

BQ25895: termination current accuracy beyond datasheet spec

April 24, 2019, 12:29 am
$
0
0

Part Number:BQ25895

Hi,

my customer set the termination current to be 128mA.

They measured with an amp meter and find that the charge terminates at 180mA.

The last time charge current read through BQ25895 register is 200mA.

Both shows that the termination current accuracy is beyond ±20% spec in the datasheet.

↧

LM5050-1: LM5050 Vgs is not hign enough

April 24, 2019, 12:30 am
$
0
0

Part Number:LM5050-1

Hi team,

My customer is doing a OR-ing circuit with LM5050-1. Please see below schematic. The load current is about 3A. When the 24V+ input is powered on, the +24V_OUT is 23.6V and the VGS of Q3 is only 0.2V. 

They used to use LM5050-1 in a larger load current use case and it works well. So could you please help check why Q3 cannot be completely turned on in this case? Thanks.

Best regards,

Wayne

↧

BQ24610: BQ24610: BQ24610 control pin when no load

April 24, 2019, 12:39 am
$
0
0

Part Number:BQ24610

Hello:

             my project is used in DC input 15V, charging is full of 12.6V charging circuit, I have two doubts, the first when I am empty, my two different items of boards HIDRV and LODRV and PH feet The switching frequency is different. The following is the waveform intercepted by the oscilloscope in my test. The second doubt is that the battery voltage I set is 12.6V, but the battery voltage I am full is 12.5. I have read the specifications and specifications of BQ24610. The 0.5% of the scale is a bit wrong. Can you give me the answer?

↧
↧

TPS51200: PGOOD hysteresis min/max value

April 24, 2019, 12:40 am
$
0
0

Part Number:TPS51200

Hello experts,

I have question about PGOOD hysteresis.

In datasheet P5 , there is only typical value.

If hysteresis has greater value than typical, the value when PGOOD is falling will be changed.

Is it possible to tell me min/max value?

I would like to know the exact value when PGOOD is falling.

Thanks and best regards,

Ryo Akashi

↧

BQ20Z45-R1: bq20Z45-R1:What makes AFE_P active?

April 24, 2019, 12:50 am
$
0
0

Part Number:BQ20Z45-R1

When the cell voltage is between CUV and COV, does the AFE_P of PFStatus (0x53) become active when the xPFIN pin goes high?
↧
Search

TLV62565: ESD FOR csd17581q3a

April 24, 2019, 12:50 am
$
0
0

Part Number:TLV62565

Dear Sir：

Such as csd17581q3a, I can not find any ESD parameter from SPEC. Is it right that we do not need to do specific ESD test for MOS?

Sorry to bother you. And thank you very much.

↧

LP38693: What is the current limit value of LP3893MPX-2.5 when the input voltage is 3.3V?

April 24, 2019, 12:52 am
$
0
0

Part Number:LP38693

 Hello guys,

 One of my customers is evaluating LP38693 for their next products.

 In the evaluation, they found the device output current limitter starts to work around 1.2A~1.5A. Their input voltage of LP3893 is 3.3V. LP3893 datasheet says that the device foldback current limit (IFB) is 850mA(Typ) when VIN-Vo<4V. But the IFB has big difference form their actual data. Does the IFB becomes bigger than 850mA when the difference voltage between VIN and Vout is smaller than 4V?

 Your reply would be appreciated.

 Best regards,

 Kazuya Nakai.

  

↧
↧

BQ25890EVM-664: Setup for BQ25890EVM with LiFePO4 Single Cell

April 24, 2019, 12:52 am
$
0
0

Part Number:BQ25890EVM-664

Hello,

I want to build a small battery pack using the BQ25890 and was wondering about two things:

  1. How do I enter the battery chemistry parameters using the bqStudio software?
  2. How would I connect USB-C/PD charger to the evaluation board?

I have the EV2300 and got it running fine with the board and bqStudio. Sometimes the cell voltage is incorrectly read but that's about it. I think I even got it charging at some point.

Thank you!

Sascha

↧

TPS22967: TPS22967DSGR

April 24, 2019, 12:58 am
$
0
0

Part Number:TPS22967

Customer is using TPS22967 and our maxiam current is defined at 4A. what will it happen when customer loading is 8A ?

they had tested 8A on load switch and we still has output normally. What is the maxiam current on TPS22967 which will cause it damage ?

↧

CCS/BQ27510-G3: BQ27510-G3

April 24, 2019, 1:03 am
$
0
0

Part Number:BQ27510-G3

Tool/software: Code Composer Studio

Thanks for your answer about timing of erasing data!

However, do you know answers of other questions about reason of I2C hang ?

1,In order to solve gost current problem, I increased cc deadband from 17 to 68(The cc deadband of V04 was changed to 68.) according to your advice. Is cc deadband change stored in 'Instruction flash' or 'Data flash'? In fact, I had been told that dffs file can cover cc deadband change during time of solving this issue? Could you confirm? 

2,Our factory will buy BQ27510-G3 from TI and update it via V04 dffs file(it is attached). Could I update FG using V04 dffs file without  any our configuration data loss because dffs file doesn't include IF section without  any our configuration data loss? Is IF part of V04 bqfs file same with default IF part of G3 bought from TI? Would you help confirm it is ok to use V04 dffs file?

3,What steps are needed to update FG via dffs file and bqfs files? Is this process same?

(Please visit the site to view this file)

 

↧
Viewing all 35901 articles
Browse latest View live
Search
<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>