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TPS51367: About variation of operating frequency

September 27, 2018, 10:31 pm
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Part Number:TPS51367

Hi,

I have created a circuit using the TPS51367 device.
Now I am checking the operation of the circuit, but there is concern that the operation of TPS51367 will affect other devices.
It is mainly concerning operating frequency.
I understand that TPS51367 performs DCAP2 control, so the operating frequency varies to some extent.
We know that the operating frequency is not regulated by electrical characteristics.
Still, I would like to check the variation in operating frequency and the temperature characteristics.
Can you tell me how much variation in operating frequency is assumed in my specification over the whole temperature range? There is no need to guarantee this.

(specification)
Input voltage: 6 V to 9 V
Output voltage: 1.0 V
Output current: 1.5 A to 3.5 A
MODE pin: GND connection (fsw = 400 kHz)

Best regards,

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TPSM84A21: ROHS

September 27, 2018, 10:39 pm
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Part Number:TPSM84A21

Dear TI Expert,

I  found the TPSM84A21 is under in-work status for RoHS

Could you suggest when will it can pass RoHS?

Thanks.

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BQ28Z610: difference between FW V0.20 and FW0.17

September 27, 2018, 10:44 pm
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Part Number:BQ28Z610

Dear TI Experts,

There are 2 firmware verison of BQ28z610 on Ti website as below picture. May I know the main difference between them? Is there a chagelist for it? Thanks a lot.

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BQ28Z610: HW setup of BQ28Z610 for 2S Li cell

September 27, 2018, 10:45 pm
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Part Number:BQ28Z610

Hello,

I have a question regarding to the wiring of the BQ28Z610. The fuel gauge shall be implemented on our system main board for fuel gauging  only. The protection function is not needed.  We would like to use a standard lithium battery pack having 2 in series connected rechargeable batteries including a protection circuit, however the middle connection of the first cell /4.2V) is not wired out of the pack to the connector.

Is it possible to use the BQ28Z610 as fuel gauge only?

How do I have to wire the VC1 and VC2 pin?

Thank you for your support,

regards sb

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TPS65400: USB 2 ANY and PI Commander Communication with TPS65400: Minimal pins to connected

September 27, 2018, 11:26 pm
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Part Number:TPS65400

Hi,

The quad buck TPS65400 will be used in our new design. At the system level the PMBUS feature is not used, the switching frequency ,soft-start time etc are fixed using on-board
resistors and capcitors.

But the PMBUS programming header(10pin) is to be included on the board to communicate with TPS65400 through USB2ANY and PI Commander for debugging and trouble shooting.
We are not interested in 30pin connector as on the EVM.
Q1.Do the programming header need connectios only with SCL,SDA and GND pins of TPS65400?
Q2. Kindly Verify the pin mapping of 10 pin programming header

J4-1 : SDA
J4-2 : SCL
J4-5 :GND
J4-3,4,6,7,8,9,10 : NC

Thanks and Regards
DEEPAK V

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CSD19536KTT: Temperature condition for R_DS(ON) in the datasheet

September 27, 2018, 11:27 pm
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Part Number:CSD19536KTT

Hello,

There is R_DS(ON) speficication in the datasheet like the below.

For this specification, there is no description about temperature condition for this parameter.
From the below figure 7, I guess the above R_DS(ON) specification is with Tc=25C condition.
Because TYP values in the above table are the same as the values in the below Figure 7 at Tc=25C (2.2m ohm for Vgs=6V and 2m ohm for Vgs=10V).
So my question is that is this R_DS(ON) specification in above table with Tc=25C condition?

Regards,
Oba

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TPS65270: TPS65270 Operating frequency problem

September 27, 2018, 11:31 pm
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Part Number:TPS65270

Follow spec ROSC Calculation formula , I can’t Calculation out example results 300KR, There was a problem there ?

WEBENCH® POWER DESIGNER (Beta) can’t support two output dc/dc design,I hope to working in 1.2MHz, How to Calculation ROSC value ?

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LM74610-Q1 Vin Max

September 27, 2018, 11:43 pm
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TL1963A-Q1: exposed thermal pad size of hypotenuse side

September 27, 2018, 11:55 pm
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Part Number:TL1963A-Q1

Hi Team,

May i have your help to get the data for following picture?

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TPS61175-Q1: Voltage on comp pin, what voltage rating for MLCC Ccomp ?

September 28, 2018, 12:01 am
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Part Number:TPS61175-Q1

Hi, What voltage at Ccomp, C4 of simplified schematic of data sheet.

Thanks.

Matt

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LP87561-Q1: lp87561-q1

September 28, 2018, 12:23 am
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Part Number:LP87561-Q1

Hello

  When I using the lp87561-q1, I found that the power output was only 0.9v, but I want it to be 1.0v.
  We need to write registers to output 1.0v.
  1. May I ask whether TI  supports the fixed output of the version 1.0v? Which channels are available?
  2. If it is user development, do you have specific instructions to avoid OTP misoperation?
Thanks.
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LMZ12002: Broken LMZ12002

September 28, 2018, 12:44 am
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Part Number:LMZ12002

Hello,

we use in our power supply four DC/DC converters (2x LMZ12002, 1x LMZ12001 and 1x LMZ14201). In the last batch we ordered (25 pcbs), 11 of the pcbs were not working because one or two of the LMZ12002 were broken: output voltage equals input voltage or output voltage = 0. Soldering out the broken LMZ12002 and replacing it by a new one fixed the problem.

We have no order the next batch now and I was wondering what we can do to avoid these problems. Therefore, I have the following questions:

  • Is the LMZ12002 less robust than the LMZ12001 and LMZ14201? Because this one was the only type which did not work.
  • How likely is it that the parts were damaged on arrival before being soldered in? (I know - this is impossible to answer). Or is the handling very critical (ESD)?
  • Do you have any suggestions what we can do nail down where the problem is coming from?

I have attached the circuit - maybe there is also something which can be improved there.

Have a nice day
Michael

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BQ76925: Can i change I2C group address?

September 28, 2018, 12:45 am
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Part Number:BQ76925

In a design i like to use more then one BQ76925. Is it possible do change the I2C_GROUP_ADDR ?

Or do i need to separate the bus between microcontroller and each chip?

Best regards,

C. Preuße

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TLV1117LV33EVM-714: POWER DISSIPATION vs. AMBIENT TEMPERATURE of TLV1117LV

September 28, 2018, 12:52 am
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TLV704: TLV70433 5V to 3.3V overshoot issue

September 28, 2018, 12:53 am
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Part Number:TLV704

Hi team,

                 My customer use TLV70433 in their design, Vin=5V,Vo=3.3V ,Cin&Cout=1uF , they found overshoot from TLV70433 .

                 they try add 10uF or 22uF at output cap as same result , could you give me some comment? 

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DC-DC requirement 5V in 24V 500mA out

September 28, 2018, 1:07 am
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Hi  Ti ,

     could  you  give  advise on DC-DC  selection?we need one DC-DC which can output  24V  500mA, the input is 5V   3A .

thanks

B&R

peiyuanqing

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1.8V input, 0.8V output, 300 mA 、 PSRR greater than 70 dB @1kHz 、SOT23-5 package

September 28, 2018, 1:25 am
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Dears,

Can you show me the IC that the replacement type of pin to pin with RT9078N-08GJ5;

1) 1.8V input, 0.8V output, 300 mA
2) PSRR greater than 70 dB @1kHz
3) SOT23-5 package,

Thank you .

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LDO : input 3.3-5.5V, adjustable output, output 3.3V, 3.6V, 3.8V, 4V, current needs 500mA, SOT23-5 package

September 28, 2018, 1:31 am
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Dears,

Can you recommended me a LDO, input 3.3-5.5V, adjustable output, output 3.3V, 3.6V, 3.8V, 4V, current needs 500mA, SOT23-5 package.

Thank you.

Best regards

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TLC6C5724-Q1: TLC6C5724-Q1 Design Check

September 28, 2018, 1:41 am
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Part Number:TLC6C5724-Q1

Hi Support Team,

We have 18 channel sequential lamp application auto turn light, and we plan use TLC6C5724 design for it.

Below is our block diagram:
How many LDO current provide for TLC6C5724?

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BQ40Z80: Schematic Review for suggestion

September 28, 2018, 2:04 am
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Part Number:BQ40Z80

Hi, Team

My customer has request for schematic review for BQ40z80, can you please help to review it?

(Please visit the site to view this file)

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