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TPS562201: TPS562201 Vout issue

August 24, 2019, 1:55 am
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Part Number: TPS562201

Hi,

TPS562201 Vin: 4.5-17V, Vout: 0.76-7V. And duty cycle is 75%, so why Vout can't reach to 17V*0.75=12.75V? what restrict the Vout? 

And Vout=0.768*(1+R1/R2), what if R1=100k, R2=10k, then Vout= 8.44V, will this cause any problem?

Best regards

Mason

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UCC28951: Is it possible to design Constant Current using UCC28951?

August 24, 2019, 3:13 am
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Part Number: UCC28951

Hi TI team,

We need Constant current output 200V 6A, please advise if UCC28951 can do.

Now when output load draws high current over limit, with soft start enable SS/EN, UCC28951 will OFF then ON.

But what we want is UCC28951 to reduce output voltage and remain 6A CC output.

Thanks,

Suttichai

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UCC28634: UCC28634DR AC- DC design

August 24, 2019, 3:30 am
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Part Number: UCC28634

 Dear Sir/Madam,

We are going to use the UCC28634DR design for AC-DC  @85V-265V to 48, 1A.

Please confirm to move forward with this design.

Thanks & Regards

Gangadhar P 

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TLV767: Dropout voltage

August 23, 2019, 7:43 pm
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Part Number: TLV767

Hi,

I am considering using TLV76701 with 13.5V input, 12V output and 200mA current.
At that time, I would like to confirm the voltage drop specifications and how much the voltage drop can afford.

So, is there a graph like the Iout = 0.2A ver. in the datasheet Fig. 14 (Vdo vs Vin: Iout = 0.8A)?

Thank you.

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CCS/SM72295: SM-72295 NOT WORK

August 24, 2019, 12:29 pm
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Part Number: SM72295

Tool/software: Code Composer Studio

Dear sirs,

I  have a problem with SM-72295..The signals LIA,HIA,HIB,LIB at pins 6,7,8,9 is ok, but I have no output at HOA ,LOA,LOB,HOB, at pins 27,24,22,19...VDD=3.5V,  VCC=10.6V,  OVS=8.9V, PGOOD=3.5V...caps between HBA-HSA  and HBB-HSB are 0.47μF...the circuit is part of MPPT charge controller  PMP7605....in that test report, there is no the correct waveforms at LIA,HIA,HIB,LIB ..it will be very helpful ...instead of solar panel is a PSU at 14.0V.....battery 12V is connected for charging....can anyone explain me why SM72295 drivers not work ?

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TPS7A54-Q1: Always Enable Feature Suggestion

August 24, 2019, 1:09 pm
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Part Number: TPS7A54-Q1

Hi 

We are using TPS7A54-Q1 and have a requirement of always ON feature for this,  is there any suggestion.

Thanks

Vikas G.

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TPS562219A: Datasheet Soft-Start Equation Error?

August 24, 2019, 1:52 pm
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Part Number: TPS562219A

The datasheet for the TPS562219A shows two application circuits using a 8.2 nF soft-start capacitor, and figures 26/27 and 39/40 indicate that this value of SS cap should yield a ~1 ms soft-start time. However, when using equation 1 on page 11, a 8.2 nF capacitor gives a calculated value of ~1 us. I suspect that the equation is incorrect, and the time "Tss" is actually calculated in seconds, rather than milliseconds. Can you confirm my thoughts here, or explain otherwise?

Thanks,

-Erik H

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UCC27211A-Q1: Minimum Bootstrap Charge Up time

August 24, 2019, 7:09 pm
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Part Number: UCC27211A-Q1

hi Sir/Miss,

May I know what is the minimum Bootstrap Charge Up time for UCC27211A-Q1 HSD with 0.1uF capacitor?

I cannot find it anywhere in the datasheet.

regards

Wilson.

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LM3478: Rout specification in the gm amlifier

August 24, 2019, 8:06 pm
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Part Number: LM3478

I am following AN-1286 (SNVA067C) simulating the system of a LM3478. In page 4 Aea=gm*Rout. And it says the values of gm and Rout can be found from the datasheet of LM3478. However, I  can only find the gm value of 800 umhos in the datasheet. There is no mentioning of Rout throughout the datasheet. Can you confirm the value of Rout is 50 Ohms as described in AN-1286? What is the variation?

Chris

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TPIC7218-Q1: TPIC7218 - 0x1B Register Allocation Fail

August 24, 2019, 8:16 pm
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Part Number: TPIC7218-Q1

Our ABS product using TPIC7218 chip, found in the actual car matching 7218 chip initialization is not normal, that is, the control register (0x1B) of the 7218 chip is not configured successfully; the SPI of the MCU and 7218 chip is included in the accessory. Communication waveform and analytical data   

 

The SPI waveform when the MCU is properly configured with the TPIC7218:
The signal types from top to bottom are: CS, SCLK, MOSI, MISO.
As can be seen from the figure, the MCU assigns "7C" to the 0x1B register of the 7218 chip, and the 7218 chip returns the register address "1B" normally.
The signal types from top to bottom are: CS, SCLK, MOSI, MISO.
It can be seen from the figure that when the MCU assigns "00" and "7C" to the 0x10 and 0x1B registers of the 7218 chip, the 7218 chip does not return the register address "10" or "1B" normally, that is, the data is not normally written. The ECU's alarm cause type is related to the value of the "0x1B" control register.
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BQ34Z100-G1: SOC estimation shows jumps during first discharge cycle

August 24, 2019, 8:29 pm
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Part Number: BQ34Z100-G1

Hello,

Below the description of two (2) situations which requires help for clarification:

1. The SOC estimation after the a 12.8V LifePo battery (10000mAh) get 100% SOC and is discharged with constant current shows jump of 10% at the end of the discharge. After the first cycle, the SOC estimation seems OK. Below the waveform with V, I and SOC.

2. The SOC estimation is hold during constant discharging. Some of the device present this situation while other not.

The SMOOTH is enabled.

Attached firmware file (srec) for reference.(Please visit the site to view this file)

Thanks

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UCC27210, output

August 24, 2019, 9:08 pm
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In the PCB, the capacitor C8 between the HB-HS pins has been moved to close to the two pins.
Excuse me, I use ucc27210 as the driver chip, power supply 12V, the capacitance between the power supply and ground is 1uF, and the capacitance between HB and HS is 0.1uF.
Measurement found:
1. The chip is powered normally;
2. Input pins HI and LI have waveforms, normal;
3. There is a 1V voltage between HB-HS;
4.LO output sometimes fluctuates, HO always outputs low level

How should this be solved? Thank you!

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WEBENCH-POWER-DESIGNER: WEBENCH would not be open in either IE or Chrome

August 24, 2019, 9:52 pm
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Part Number: WEBENCH-POWER-DESIGNER

Hi Support team 

WEBENCH would not be open in either IE or Chrome  for a long time in my laptop for a long time

need your kindly help to guide how to fix it 

IE

 

chrome 

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LM5121-Q1: Iripple and Vripple of the output capacitor COUT

August 25, 2019, 3:04 am
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Part Number: LM5121-Q1

Hi,

When we make the detailed design procedure of LM5121, we don't understand the equation (30) and (31) in 8.2.2 Detailed Design Procedure.

Could you please what is Iripple_max(cout)? And why Iripple_max(cout)and Vripple_max(cout) are calculated like those two equation?

Thanks&Best Regards,

Wenxiu

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TPS63020-Q1: Bidirectional energy transfer function and negative current limit

August 25, 2019, 4:33 am
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Part Number: TPS63020-Q1

Hi,

I read the document http://www.ti.com/lit/ug/slva726/slva726.pdf 

In section 3.2 Backup Capacitor Charging Operation, it says that "The TPS63020 buck-boost converter operates bidirectionally and is able to transfer energy from its input to its output as well as from its output to its input."  But in the datasheet of TPS63020, it doesn't say anything about the bidirectional energy transfer function. Does all the buck-boost have this function?

Besides, it says"The charge current is defined by the negative current limit of the TPS63020 buck-boost converter. Depending on the converters operating mode, either in buck mode or in boost mode, the negative current limit is typically between 0.6 A and 0.8 A." But I can't find the negative current limit in the datasheet of TPS63020.

Thanks&Best Regards,

Wenxiu

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BQ79606A-Q1: BQ79606A-Q1

August 25, 2019, 5:04 am
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Part Number: BQ79606A-Q1

Hello.

Do you provide  sample code for the IC?
Mail ID: gururaj@vaakulab.com
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BQ25155: test - will delete

August 25, 2019, 5:32 am
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Part Number: BQ25155

test post - will delete later - Jim

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BQ76940: BQ76940

August 25, 2019, 6:15 am
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Part Number: BQ76940

BQ76930

Hello,

Understand that BQ76940 can support up to 20S battery cell. Please advise if this part is stack-able to support 30S battery cell?

Hope to hear from you soon. Thanks.

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TPS61022: Asking for the recommendation on TPS61022 design

August 25, 2019, 9:28 am
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Part Number: TPS61022

Hi Team,

Customer is using two boost voltage required on their application. one is output 5V and the other one is 7V.

Is possible to do something change for TPS61022 to support output up to 7V or 8V (margin)?

Would you please provide your comment for this?

 

 

 

BR,

SHH

 

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TPS61099: Inrush Current

August 25, 2019, 11:15 am
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Part Number: TPS61099

Hi

I'm using a TPS610993 converter in my circuit and have some issues with the inrush current.



As soon as I enable the converter there is an inrush current spike around 100mA for about 3ms. I also tried to decrease C8 to 100nF to see if the capacitive load is too high and causes this inrush current spike. However, C8 should be at least 10uF as it's written down in the data sheet for a stable voltage output. Is it somehow possible to cut off these spikes? I need them to be below 15mA. Is there another type with better performance to get 3V out of 1.2V with a typical current load of 10mA.

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