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CCS/UCD3138PFCEVM-026: UCD3138PFCEVM-026

July 11, 2019, 1:08 am
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Part Number:UCD3138PFCEVM-026

Tool/software: Code Composer Studio

Hi engineers:

   About  UCD3138PFCEVM-026  Programm,  I download the code(PWR026_PFC) from TI website,  and  debug  by CCS6.2.0 and 9.1,  but I need help for some promblems.   Even if I change the CCS edition , the problem is not solved.  See the problem:    

'Finished building target: PWR026_PFC_UCD3138.out'
' '
'Tektronix Extended format'
("E:/ccs6/ccsv6/tools/compiler/ti-cgt-arm_5.2.5/bin/armhex.exe" -x "PWR026_PFC_UCD3138.out" -o "PWR026_PFC_UCD3138.x0" -memwidth 8)
makefile:195: recipe for target 'post-build' failed
process_begin: CreateProcess(NULL, (E:/ccs6/ccsv6/tools/compiler/ti-cgt-arm_5.2.5/bin/armhex.exe -x PWR026_PFC_UCD3138.out -o PWR026_PFC_UCD3138.x0 -memwidth 8), ...) failed.
make (e=2): The specified file could not be found by the system

gmake[1]: [post-build] Error 2 (ignored)
' '
**** Build Finished ****
we got .out file，but we can not get x0 file Compilation failure.
Can you help me?Thank you
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LM22678: Power management forum

July 11, 2019, 1:34 am
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Part Number:LM22678

Hi all.

According to the data sheet, the resistance is set as shown below, and 4.998V is normally output.
However, after a few seconds to a few minutes, the power goes down.

Vin   12V

Vout 5V

Ven  about 2.5V

R_ENT 80.6K

R_ENB 20K

R_FBT 2.87K

R_FBB 1K

The following schematic is for the LM22678.

Voltage Graph:

Please let me know where I made the mistake...

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ULN2003AI: differences between ULN2003AI and ULN2003A

July 11, 2019, 2:07 am
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Part Number:ULN2003AI

Hello Team,

My customer will change the device from ULN2003A to ULN2003AI due to an ambient temperature is higher than ABS. Customer wants to know what he should focus on the evaluation items. I confirmed the datasheet, most different are VOH and temperature related specs. Customer would like to reduce an evaluation time because of . What does an evaluation items most important to change the device between A to AI?

Best Regards,
Fujiwara

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TPS54160: PMP5150 reference design

July 11, 2019, 2:14 am
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BQ25120A: Verification of Power Section for Glucometer

July 11, 2019, 2:22 am
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Part Number:BQ25120A

Customer has designed power module for their 600mAh Battery Charger and stable power regulation at 3.3V with less than 1% tolerance on load condition.

Kindly help to verify the schematic. PDF is attached

(Please visit the site to view this file)

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TPS61099: Vin to Vout gap question

July 11, 2019, 2:23 am
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Part Number:TPS61099

Hello Sir,

May I have your comment

Our application is one-time Li-battery 2V~3.6Vin  . Target Vout is 3.3V

Vin < Vout+0.5V enter down mode .

But when Vin close to Vout or a little below Vout  ex: Vin 3.3 V and 3.2V  , Can tps61099 still Vout 3.3V ?

Due to Webench can't create this design.  Pls help to check this condition workable or not . Many thanks !

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TPS65190: Why could TPS65190 VCOM not work?

July 11, 2019, 3:03 am
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Part Number:TPS65190

Hi, Sir,

I used reference design at datasheet. But VCOM is always output avdd, it is not half avdd. so what should I do?

regards,

Hsu Hung Lin

 

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TPSM831D31: Can TPSM831D31 support stackable function

July 11, 2019, 3:10 am
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Part Number:TPSM831D31

Hello Team,

My customer has a special application that need large current output, the Vin is 12V, Vout is 1V~3V(adjustable by like PMBus), Iout (max.) is 1000A. It seems like there is no one chip solution can support this kind of application, therefore only the devices with stackable function can meet.

Customer is wondering can TPSM831D31 support stackable feature? If not, is there any recommendation? Power module is prefered but buck controller is fine.

Thanks a lot.

Vincent Chen

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LM25117-Q1: LM25117-Q1 configuration of CM pin

July 11, 2019, 3:11 am
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Part Number:LM25117-Q1

Hello team,

My customer is considering whether they use CM pin or not. Then the customer has a question.

They would like to set float at CM pin when the current monitor function is not used. Is it OK or not?   I believe that the float of CM pin has no problem, however I would like to confirm. Would you please advise?

Your help would be so appreciated.

Best Regards,
Akihisa Tamazaki

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UCC28951-Q1: Low pass filter on CS pin

July 11, 2019, 3:14 am
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Part Number:UCC28951-Q1

Hi Experts,

On our designed PCB, there are serge on the current of primary side of transformer, we add LPF on CS pin to avoid the surge.

1. Is this understanding correct to avoid this surge?

2. If this answer is yes, what fc should we set for this LPF? We are currently set fs at 200KHz to filter this surge.

Regards,

Uchikoshi 

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TPS54061: Inverting output

July 11, 2019, 3:21 am
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Part Number:TPS54061

Hi

We want to design inverting output circuit with TPS54061.

The requirement is as below.

Input : 24V

Output : -17V/100mA

Do you have any materials or reference design that can be help to refer?

BestRegards

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UCC28951-Q1: RCS calculation

July 11, 2019, 3:28 am
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Part Number:UCC28951-Q1

Hi Experts,

We calculate RCS by following below equation and it becomes 15 ohm.

My question is that with this resister value the current is NOT limited by our target. Do we miss anything?

Regards,

Uchikoshi

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LP5562: I2C standard mode rise/fall time spec

July 11, 2019, 3:31 am
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Part Number:LP5562

When LP5562 is operating at standard mode(<100KHz)

The rise time / fall time can follow UM10204 standard mode spec ?

For example

1. Rise time for SCL\SDA measurement result is 18.56ns. < 1000ns -- meet standard mode critria
2. Fall time for SCL\SDA measurement result is 9ns. <300ns -- meet standard mode critria

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TPS65320D-Q1: Switching frequency control.

July 11, 2019, 3:39 am
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Part Number:TPS65320D-Q1

Hi,

I would like to create "dithering" by adjusting the BUCK switching frequency from external source ( MCU) .

Will the BUCK stay stable while changing its switching frequency dynamically ?

What is the minimal time interval between two changes ?

Thanks,

Ofer

 

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LM79: -15V output 3-terminal regulator (TO-220) which can support in minus temperature range

July 11, 2019, 3:42 am
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Part Number:LM79

Hello experts,

I'm looking for 3-terminal regulator (TO-220) with fixed -15V output.

LM7915 looks good, but operating temperature range is little bit narrow. I need the device which can support in minus temperature range.

Do you have any other suggestion?

Thanks and best regards,

Ryo Akashi

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TPS65094: how does push-button circuit connect without EC

July 11, 2019, 3:46 am
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Part Number:TPS65094

Dear Sir,

    We are now using TPS650940 as PMIC and TPS51285B as BUCK for Intel APL-I and without EC.

    The BUCK have 2 always-on rails, VREG3 and VREG5 and we use VREG3 only.

    The PMIC  have 2 always-on rails, LDO5P0 and LDO3P3, not used.

    The Power of Push-Button circuit is VREG3 and the output of Push-Button circuit is 'CTRL'.

    Should we connect 'CTRL' to enable pin of BUCK or enable pin of PMIC?

    The attach file is our block circuit.Thanks!

(Please visit the site to view this file)

    

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UCC28951-Q1: Magnetization support

July 11, 2019, 3:49 am
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Part Number:UCC28951-Q1

Hi Experts,

We add 66uF capacitor on the primary side of transformer to prevent the magnetization. The magnetic flux density is 150mT but it looks the transformer is saturated.

Does UCC28951 compensate the magnetization?

Regards,

Uchikoshi

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TPS92515HV: PWM frequency and UVLO (Part2)

July 11, 2019, 4:17 am
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Part Number:TPS92515HV

Hello,

we still have some issue with the proposed solution. To avoid  any misunderstanding can you point me the proposed boot circuit that replaces the circuit in Figure 25 (http://www.ti.com/lit/ds/symlink/tps92515.pdf).

Is there any chance to get a drawn circuit?

Thanks and Regards,
Daniele

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TPS23880: I2C connection through I2C switch

July 11, 2019, 4:22 am
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Part Number:TPS23880

Hi Team,

Our customer plan to connect three TPS23880 through an I2C switch(PCA9548), is this has any side effect? Or anything needs to be careful?

Thank you very much,

C.T.

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LM5150-Q1: Duty cycle limit at cycle-by-cycle current limit in start-stop mode

July 11, 2019, 4:23 am
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Part Number:LM5150-Q1

Hello team,

My customer want to know how much the duty cycle was limitted or decreased when entering the cycle-by-cycle current limit in the start-stop configuration.
Please expalin how to operate the the cycle-by-cycle current limit of LM5150-Q1including calculation.

Best regards,
DY

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