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LM2678: Inductor selection guide for wide input rage.

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Part Number: LM2678

Dear Sir,

My customer is now using LM2678S-ADJ/NOPB.

I have some problem.

When Input voltage is 12V. it is OK.

but when Input voltage is 28V, LM2678S-ADJ is burned.

Could you tell me Why LM2678S-ADJ is burned.

Could you advise me to solve this issue?

If you need more information please let me know that.

Specification are below.

Input Voltage rage : 9V ~ 36V

Output voltage : 9.33V

Output current : 2.5A

please refer to the attached schematic.


BQ77915: bq77915

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Part Number: BQ77915

Hello TI,

Can we use this IC for LFP cells with

nominal voltage 3.2V

Under Voltage  2.5V

Over Voltage 3.8V

PTH08T220W: About DAC control Vo_ADJ pin

LM5030: LM5030 push pull step up

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Part Number: LM5030

Dear TI Team

I would like to step up 12VDC to 350VDC ~ 380VDC (300W  and  Peak load 600W). and i choose LM5030 for push pull converter.

i have few questions to ask
1. LM5030 suitable for this application?
2. LM5030 can operating PWM frequency below 100KHz?
3. UC2827-2 Current fed push pull suitable for this application?

Regards

Watchaphong

TPS65381A-Q1: About VDD3/5 output voltage dynamic

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Part Number: TPS65381A-Q1

Hello,

Regarding to VDD3/5 output voltage dynamic on TPS65381A-Q1, my customer is asking a question.

According to datasheet, it is as following.


 

(Question)

Why are deviation of mini/max values different at 3.3-V Setting?

5V Setting : Typ.-Min.=0.15V、Max.-Typ.=0.15V

3.3-V Setting : Typ.-Min.=0.15V、Max.-Typ.=0.13V

 

Could you please tell us about reason for above different?

 

Regards,

Tao 2199

CSD95372BQ5M: Power management forum

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Part Number: CSD95372BQ5M

I have two questions:

(1) What's the difference between CSD95372BQ5M and CSD95378BQ5M?  I cannot tell from the published datasheet.

(2) What's the gain (mV/A), offset, noise, and linearity of the Iout pin?  Does the Iout sense both positive (flowing out) and negative (flowing into the power stage) current?  What's the recommended/allowable range for REFIN?

Voltage Controlled Current Source

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I need a programmable current source controlled by an input voltage for driving a solid state laser. The key specs are:

1. Input voltage: 5 VDC +/-5%  (can be 12V if required)

2. Output current: 0-15 ADC

3. Input control voltage: 0-5V to control 0-15A output linearly

4. Output load and compliance: Laser diode, typically around 2V, 3V max 

5. Power enable input.

6. Current regulation: Within 1%

Initially, the requirement is for constant continuous programmed current, i.e. CW mode.

However, in future I will need pulsing at variable frequency upto 100kHz, with variable duty cycle of 5-50%. 

Thanks for your help in advance,

Ashok

BQ27750: 05bqz broadcast bit is RVSD. it is be closed?or always turn on?

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Part Number: BQ27750

05bqz broadcast bit is RVSD. it is be closed?or always turn on?


UCC27524A-Q1: The Junction-Case thermal resistance question

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Part Number: UCC27524A-Q1

Hi,

My customer is using UCC27524 as their secondary side low side drivers.

In datasheet, we only give the thermal resistance of Junction-top case, but not give the value of Junction-bottom case.

  • Why does not the datasheet offer the value of thermal resistance of junction-bottom case with SOIC8 package?
  • When the temperature of top side and bottom are different, what is the thermal circuit model look like? How to calculated the junction temperature?
  • As the value of thermal resistance of junction-bottom case is much lower the junction-top side one, so the temperature of bottom side will be lower. Customer wonders that, how to measure the bottom side package temperature of UCC27524? And, the most important, what is the proper way to evaluate the thermal performance of this IC?

BQ25895: Check the OTG mode behavior

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Part Number: BQ25895

Hi Team,

We would like to double check below condition.

For the BQ25895, if we removed the VBUS and enable the OTG mode, then PMID pin will present 5V and VBUS present 0V.

Is it correct?

We have tested the BQ25606, if we enable OTG mode, the VBUS and PMID pin will present 5V both. Looks the behavior is different between BQ25606 and BQ25895.

TPS92511: Can TPS92511 be used with paralleled LEDs

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Part Number: TPS92511

Hi 

Can TPS92511 be used with 12 paralleled LEDs?

If yes, what potential risk it will have?

TPS7B82-Q1: thermal resistance between junction to solder pad(thermal pad pin) for TPS7B8233QDGNRQ1 package.

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Part Number: TPS7B82-Q1

Hello TI,

We are using this package for automotive application. 

Actually I'm looking for thermal resistance between junction to solder pad

In datasheet thermal information table below details are given 

Junction to board thermal resistance is 22.6°C/W

Junction to case (bottom) thermal resistance is 12.1°C/W

what is the difference between above two parameters? 

could you please give me information about Rth(j-sp) - Thermal resistance between junction to solder pad (thermal pad pin) for TPS7B8233QDGNRQ1 package.

Thank you 

TPS65094: Test sleep S3 system reboot

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Part Number: TPS65094

Hi Team,

We tested the TPS650940 in Apollo lake platform.

Test system in S3 loop (S3->S0->S3->S0)

We found the system be rebooted in S3 to S0, is it normally?

Have you meet similar issue before? 

EMB1428Q: EMB1428 switch on time problem

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Part Number: EMB1428Q

HI

At present, the debugging has been normal, and charge pump also has waveform, and I want to know what kind of waveform will be on the oscilloscope of the switch pin that should be turned on when the chip operates normally.

Attached the waveform. The switch pin open for a short period. I wonder if this is correct? Is there any way to keep it open longer? Or something wrong.

Waiting for your reply.

Thanks

Star

TPS23758: Power Transformer

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Part Number: TPS23758

Hello TI-Team,

for a PoE-Application, we want to use the TPS23758 to create 5V from PoE. In the evaluation board circuit of the TPS23758 is the power transformer of the type "LDT1018-50R" from LinkCom. Can you offer a datasheet for this power transformator? On my research i cant find a datasheet from this part.

In this context, we are also looking for an alternative power transformer. Can you recommend another power transformator, as in the evaluation circuit used? Actually we tend to use a power transformator from WE:

https://katalog.we-online.de/en/pbs/WE-POEH

Datasheet:

https://katalog.we-online.de/pbs/datasheet/7491195501.pdf

Is this 5 volt power transformer useful in combination with the TPS23758 from your point of view?

Thanks for your help!


LM3290: Capacitor values in LVDT schematic (AN-301 Signal Conditioning for Sophisticated Transducers)

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Part Number: LM3290

Team,

does anyone know who is the author of the below application note:

AN-301 Signal Conditioning for Sophisticated Transducers
http://www.ti.com/lit/an/snoa606b/snoa606b.pdf

The question is about LVDT schematic (Figure 14. LVDT, below) and some of the capacitor values - some of them do not have a given multiplier (uF, nF, pF); for example: 0.005, 0.2, 0.01, 0.1.

Then, on top left there is a resistor with value 10. Is it 10 Ohm?

Thanks for your help.

BQ24295: BQ24295: Check the OTG mode behavior

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Part Number: BQ24295

Hi Team,

We would like to double check below condition.

For the BQ24295, if we removed the VBUS and enable the OTG mode, then PMID pin will present 5V and VBUS present 0V.

Is it correct?

We have tested the BQ25606, if we enable OTG mode, the VBUS and PMID pin will present 5V both. Looks the behavior is different between BQ25606 and BQ24295.

BQ24005: Heating issue while charging

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Part Number: BQ24005

Hi,

I have designed a Li-ion battery charging circuit using the BQ24005. But the IC is heating while the battery is charging (No heating observed while discharging)

I have set a charging current of 1A  and I  used a 7.4V, 12Ah (2S5P) Li-ion battery

While measuring input (IN1,IN2) showing 9.1V 

See the schematic portion and the thermal pad connections of the IC (1st and 2nd layers)

Kindly suggest a solution for this problem

Thanks in advance..

Parthan

TLV705: Output accuracy curve

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Part Number: TLV705

Hi Team,

1. Is there any measurement data or curve about Tj to output accuracy?

2. I found the most related curve is figure6 in datasheet, but does TI has the same curve in 3.6Vout?

3. If not, then how can I expect the deviation compare with figure6?

Thank you very much.

C.T.

TPS53219A: FAQ: TPS53219A Bode plot question

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Part Number: TPS53219A

Hi

Now, we measue the TPS53219A bode plot.

we want to confirm what is stable about the cross frequency?

we know cross frequency is 1/2 sw frequency unstable, now we measure the below value.

So,  is it stable in below value? 

 switching frequency is 300kHz. the cross frequency is 132kHz.

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