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TPS54331: How much accuracy is it?

October 9, 2018, 11:58 pm
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Part Number:TPS54331

I would like to know the accuracy of the TPS54331 but I can't find it.

How much is it?

Can we use the accuracy of the voltage reference which is 3.5%

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UCC28911: The precision of Low voltage, current-limiting protection.

October 10, 2018, 12:18 am
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Part Number:UCC28911

Dears:

Customer will evaluate UCC28911 and have some issue as below:

A. The precision of low voltage protection.

b. The precision of current-limiting protection.

c. The precision of constant-current source.

d. What is the function of LM8364? Can UCC28911 realize the function?

 

Btw, the customer's project requirement as follows:

Is there any other PN to promote except for UCC28911? 

1. anti shock isolation mode

2. the output power is about 10W.

3. no optocoupler primary feedback PSR

4. Integrated MOS tube (more than 700V)

5. Integrated high voltage constant current source to start

6. it is best to support CV (constant voltage) and CC (constant current) mode.

7. low power consumption, high light load efficiency

8. under-voltage protection

9. over current protection / overload protection

10. best equipped with PFC

11. over temperature protection

12. output overvoltage protection

13. short circuit protection

14. two output cross load, good voltage regulation performance.

15. it's best to have Green mode.

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LM2596: new product

October 10, 2018, 12:22 am
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Part Number:LM2596

Dear TI Experts,

I find that many customer are using LM2596, and LM2596 is very old product~

I'd like to know will their be any new product that is pin compatible and can take place of lm2596? 

Thank you`

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TLC59116F: Implementation of individual dimming pattern

October 10, 2018, 12:27 am
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Part Number:TLC59116F

Team,

could you please support with the question below?

I'm looking to implement a dimming pattern for each LED channel by periodic rewrite of PWMx value.

Do you see any reason why this shouldn't work with the TLC59116F?

Thanks and best regards,
B

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LMR14030-Q1: Bootstrap Capacitor

October 10, 2018, 12:36 am
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Part Number:LMR14030-Q1

Hi,

We got a question from the customer about LMR14030-Q1.
Could you help us?

[Question]
They are considering using GRM033R6YA104KE14 for the bootstrap capacitor. They are concerned about that the effective capacitance badly affects to the operation. How much is the recommended effective capacitance of the bootstrap capacitor?

Best Regards,
tateo

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BQ4050EVM-561: Relationship between (CHG and DSG), (XCHG and XDSG) and (CHG_TEST and DSG_TEST) bits

October 10, 2018, 12:36 am
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Part Number:BQ4050EVM-561

Hi,

Can you please tell me the relationship between (CHG and DSG), (XCHG and XDSG) and (CHG_TEST and DSG_TEST) bits ?

I'm Using BQ4050EVM-561 with EV2400 and found these bits in Register Bit Window when I toggle the CHG_FET_TOGGLE and CHG_FET_TOGGLE button.

And I confuse on some following issue:-

1. When CHG_FET_TOGGLE and DSG_FET_TOGGLE button press then (XCHG ,XDSG) bits becomes high and (CHG_TEST, DSG_TEST ,CHG ,DSG) become low or vice verse.

2. When CHG ,DSG are low and  i press the CHG_FET_TOGGLE button then CHG_TEST and CHG goes high and XCHG goes low but Charging fet not open , there is no current on current meter.

3. When CHG ,DSG are low and i press the DSG_FET_TOGGLE button and CHG_FET_TOGGLE button then CHG_TEST,DSG_TEST and CHG,DSG goes high and (XCHG ,XDSG) goes low then i press  the DSG_FET_TOGGLE button again then DSG_TEST goes low and DSG,XDSG goes high

Regards 

Rahul 

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TPS22810: Could you teach the principle why output voltage steps up to 1.7V?

October 10, 2018, 1:06 am
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Part Number:TPS22810

Dear all,

Could you teach us the reason why 1.7V output voltage occur after ENABLE=ON?

At this test condition,

1, we set Vout about 0.6V as residual charge.

2, we set Enable=ON.

3, then, TPS22810 started up and Voutput became about 1.7V.

4, after 300us, Voutput started up.

For more detail, please look at attached file below.

(Please visit the site to view this file)

Best regards,

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Suggestions for Low noise power supplies from TI

October 10, 2018, 1:13 am
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Hai,

i am a designer looking for low noise power supplies for my design.I need two different buck regulators both for 3.3 and 5V power supplies.The current supplying capabilities of both needs to be in range of 500mA or less.Please Share your suggestions regarding this.

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TPS57040-Q1: The timing of DCM and Eco-mode

October 10, 2018, 1:17 am
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Part Number:TPS57040-Q1

Hi Team,

I have question about the timing of changing from DCM to Eco-mode for TPS57040. I found the explanation but I want to know how to calculate this value.  Could you tell me how to calcurate these value.(P.35, 8.2.2.11 Discontinuous Mode and Eco-mode Boundary.

I am awaiting your reply

Thanks,

Masayuki

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LP8863-Q1: Channel configuration

October 10, 2018, 2:48 am
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Part Number:LP8863-Q1

Hi, team.

We use LP8863-Q1 with edge type backlight.

Please tell me the channel configuration that flicker hardly occurs.

Examples 1-2-3-4-5-6, 1-6-2-5-3-4, 1-2-3-6-5-4

Best Regards,

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BQ24195L: schematic of circuit for particular input output value and Boost Mode Operation Current limiting

October 10, 2018, 2:54 am
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Part Number:BQ24195L

Hi,

I want to use bq24195l to make a power bank circuit I'm a automation engineer i don't have pcb designing skills i want a complete schematic for pcb using bq24195L the requirment of design are followings.

1) input is 5.1v and current is in between 2 to 2.5amp.

2)I also want current limiter at out pmid pin to avoid overloading and short circuit in boost mode.

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LM3525: Difference of LM3525-L/H

October 10, 2018, 2:57 am
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Part Number:LM3525

Hi,

Are LM3525-L and LM3525-H common completely except for a polarity of EN pin?

I'm worrying that what these actual current limit value has large difference.

Best Regards,

Kuramochi

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TPS54531: input capacitor selection

October 10, 2018, 3:00 am
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Part Number:TPS54531

Hi,

Our customer considers using electrolytic capacitors for input capacitors.
We understand that ceramic capacitors are recommended in 9.2.2.4 of datasheet P.14. Is there any problem?
I believe that it is usable if the conditions of equations (6) and (7) are permitted.
If you have problems, please let me know your concerns.

Best regards,
Yuto Sakai

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TLV700: Does this application have problem when enable the power up before Vin?

October 10, 2018, 3:06 am
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Part Number:TLV700

Hi team,

Does this application have problem when enable the power up before Vin for TLV700/3? Thanks.

BR

Frank

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BQ24171: Charge current variation

October 10, 2018, 3:08 am
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Part Number:BQ24171

Hi,

We are using single cell Li-ion battery with a capacity of 3200mAh. And using a 5V power supply to charge the the battery at Charge current of 650mA.

When battery is charged, we could see the DC input current and charge current is fluctuating with the difference of 40-50mA. Can you let us know the reason for this behavior?

Thanks,

Sivaraj

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LP8758-E0: About PCN

October 10, 2018, 3:28 am
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Part Number:LP8758-E0

Hi,

It is a question about the change from Rev. A to Rev. B.

Q1.About changing recommended operating range

In the LP8758-E0, there is a part changed to "VANA with 3.6 V maximum".
In LP 8758-B0, there is a part changed to "VANA up to 3.6".
Are these meanings the same?

Q2.About 7.3.2 Power-Up

I think that it is necessary to wait 1.2 ms until I2C host R / W after setting NRST high.
It is 700 μs at RevA, will it be listed in Revision History?
PCN of LP8758-B0 was the same change, but B 0 is listed in Revision History

Best regards,
Yuto Sakai.

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TPS548D22: Excel Calculator

October 10, 2018, 4:06 am
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Part Number:TPS548D22

Dear all,

is there any excel calculator to select the external components (inductor, output cap) in order to meet design requirements (Vout ripple, Vout regulation, Response to load transient) ?

Can webench accept these design requirements ?

regards,

Domenico 

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LM74700-Q1: availability

October 10, 2018, 4:07 am
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Part Number:LM74700-Q1

Hello Dir Sir/Lady

the LM74700-Q1 is very attractive device. however i see it can not be purchased or even order samples. can you tell me the status of this device ?

kindly regards

amos

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TPS54062: TPS54062

October 10, 2018, 4:08 am
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Part Number:TPS54062

Hi, I build a DC-DC buck regulator using TPS54062. I share the schematic that I draw. Its output voltage should be stable but it's not when I change the input voltage. When I apply 30Vdc Input voltage TPS54062 provides 12.7VDC and when I apply 20Vdc input voltage it provides 10Vdc. What could be the problem? What should i look for? Thanks.

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BQ34Z100-G1: Issue when writing configuration file

October 10, 2018, 4:24 am
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Part Number:BQ34Z100-G1

Team,

my customer encounters issues when writing the configuration file onto the device during production. Some of the devices (60 out of 1000) act like there is no firmware present and thus the configuration cannot be applied.
The boards are produced in batches of 10 boards per batch. It seems like, if the issue occurs, the entire batch is affected.

Is there any sequence that erases the firmware from the devices that might happen during production?

Thanks for your help!

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