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TPS3808-Q1: About Manual reset

April 19, 2019, 1:07 am
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Part Number:TPS3808-Q1

Hi team.

My customer designed reset circuit as the below. 

They added pull-up resistor(4.7kohm) between SENSE to /MR.

If MCU does not control /MR(/MR input signal is High) and when output voltage of LM43602 is stable, could additional pull-up resistor cause problems with the output?

Could pull-up resistor have a bad effect on the circuit?

Please refer to LM43602-Q1 circuit below.

Please check and reply ASAP.

Thank you

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LM25066: 120A solution

April 19, 2019, 1:10 am
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Part Number:LM25066

Hi team,

any recommend for 120A hot swap? customer prefer Rsense intergrated.

can also provide reference design

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TPS40170RGYR thermal issue

April 19, 2019, 1:17 am
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Hi 

I use TPS40170RGYR to my design 12-48V input to 3.3V, but when 48v input cause thermal issue.

I want to know the what is the current through the LDO inside the TPS40170RGYR and the curve for input voltage vs TPS40170RGYR thermal

thanks

Smith   

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TPS92560: Can TPS92560 support constant current output?

April 19, 2019, 1:31 am
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TPS92560: LEDs flickering when TPS92560 working with electronic transformer

April 19, 2019, 1:43 am
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Part Number:TPS92560

LEDs flickering when TPS92560 working with electronic transformer, tried inductance 15uH, 30uH(2x15uH in series) and 47uH, none of them would stop flickering.

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TPS25221: Detail specification for reverse current block

April 19, 2019, 1:47 am
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Part Number:TPS25221

Hello

My customers are reviewing to use TPS25221DBVR.

Only the brief text of "Reverse current block" is shown on Datasheet of TPS25221DBVR as below.

The AP2553W6-7 from diodes, a competing part, provides a detailed description of the reverse current block as shown in the datasheet below.

Can you give me a more detailed specification like this?
Pleas check it.
Thank you
Best regards
From Anthony
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BQ27421-G1: hibernate mode

April 19, 2019, 2:01 am
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Part Number:BQ27421-G1

hello,

our customer is looking for a way to minimize bq27421 consumption current and he has a plan to utilize Hibernate mode. Could you please suggest if the gauging accuracy will be deteriorated by using Hibernate mode frequently.

best regards,

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Charger Reference Design for 2series NiMH Battery

April 19, 2019, 2:16 am
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Hi TI experts,
Do you have charger reference design for 2-series NiMH battery? Need a fault signal and stop charge when detect charging dry cell. 

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LMR14030-Q1: LMR14030-Q1: the overshoot of the SW waveform is too large

April 19, 2019, 2:27 am
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Part Number:LMR14030-Q1

Dear team,

My customer is using the LMR14030-Q1 in several projects, now they encountered a problem when testing as below, the overshoot of the SW waveform(marked by red circle) is too large(2.5V), their schematic is the second picture. Could you please help give me the reason why the overshoot is so large?

Thanks & Best Regards,

Sherry

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BQ25713: How to measure Bode plot

April 19, 2019, 2:30 am
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Part Number:BQ25713

We would like to measure Bode plot of bq25713.

Please tell me the injection resistor point we should put.

- During charging operation
   Is it between VBAT and SRN pin?

- When BATFET is OFF
   Is it between VSYS line and VSYS pin?

- During OTG mode
   Is it between Vin line and VBUS pin?

Best Regards,
Kohei Sasaki

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TLC6C5724-Q1: How to drive TLC6C5724-Q1 EVM ?

April 19, 2019, 2:31 am
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Part Number:TLC6C5724-Q1

Hello TI,

I made MCU send SPI signal to drive TLC6C5724 EVM, but the EVM could not be lit and the SDO port had signal transfer. The following is the signal I captured. Please help me check what was wrong.

(PS: The signal data that I sent to the register(GS or FC_BC_DC)  was copied from the TLC6C5724 EVM GUI which can successfully light  the EVM.)

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TPS54232: Always Eco mode Iout < 100mA application

April 19, 2019, 2:37 am
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Part Number:TPS54232

Hello

If I use TPS54232 for Iout < 100mA application, the devie us alway in Eco-mode. What is concern for the usage?

Best regards,

Tetsuro

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TL431: A application Question about TL431

April 19, 2019, 2:38 am
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Part Number:TL431

Hi Experts,

When coming into reading TL431 datasheet Fig 36. I found there might be a problem for this kind of design:

Since VI(BATT) is connected directly to a resistor divider to REF. When VI(BATT) is higher than Low Limit, voltage on REF will therefore inevitably be higher than 2.5V. As what i can consider, put R3 before first resistor divider(left one) can solve this. Could you please give a clarification? Thank you for your help!

-Wenhao 

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MC33063A: MC33063A as Buck high current

April 19, 2019, 2:41 am
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Part Number:MC33063A

Hello.

i must use MC33063A for a project where: 

Vin = 12V to 24V

Vout = 5V

Iout = 2A

I can't use the normal configuration but with external NMOS or PMOS yes.

My question:

1- What is the better solution, NMOS or PMOS? What is the difference between the two solutions?

2- How I can configure the components?

Thanks

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TPS82130: Tolerance to ionizing radiation

April 19, 2019, 2:41 am
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Part Number:TPS82130

Hi Team,

My customer has a question about TPS82130. The question is below:

Will inspecting printed circuit boards with X-rays harm TPS82130SILT?
How much X-ray intensity can TPS82130SILT stand?
How long can TPS82130SILT stand?

Pls help me 

BR

Tom.Liu

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UCC2897A: UCC2897A power on issue

April 19, 2019, 2:59 am
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Part Number:UCC2897A

Hi,

We use UCC2897A for spec Vin is 54V and Vout is 12V.

PQ8 will be damaged. The fail rate is about 280/7000(4%).

 

Ch1: PQ8 VDS

CH2:VDD

CH3: SS

 

When power on, there are 2 spikes on PQ8 VDS.

Do you have any suggestion for this case?

 

(Please visit the site to view this file)

 

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TPS2372: Device not recognized by active PoE switch

April 19, 2019, 3:20 am
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Part Number:TPS2372

For a 60W POE application I used the TPS2372 to handle the negotiation, schematic for the relevant parts added as PDF.

The design works with passive PoE injectors, but active ones indicate there's an issue in the recognition process.

I've based the design off the 'recommended application' in the datasheet, is there anything i might have done wrong?

(Please visit the site to view this file)

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TPS25942A: About Voltage Droop Calculation Formula

April 19, 2019, 4:40 am
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TPS2377: Load Capacitor Selection for PD

April 19, 2019, 4:59 am
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Part Number:TPS2377

Hello,

I was looking for assistance in choosing a load capacitor for the TPS2377 PD.  Looking on page 16 of the data sheet it provides a formula for determining the right capacitor value.  Any value I look at comes to about an order or two of magnitude larger than the maximum that is recommended (470uF).  Is there an updated formula or am I just calculating it wrong?  Downstream of the capacitor will have a 15 W DC-DC converter which will probably draw around 5W of power.

Thank you for your help!

Matt

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TPS63002: 5v isn't generated from inout range between 3 to 4.2V

April 19, 2019, 5:46 am
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Part Number:TPS63002

I am using TPS63002 in one of the my project. I want to generate 5V  @ 1A  from Li-ion battry. So input is between 3 to 4.2 V. I have connected as shown below:

My issue is when i powered up IC getting hot output drops to 3V ( sometimes it is 1.8 v also).

Can you suggest what was wrong in above schematic? 

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