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BQ24070: BQ24070 SUPPLY MODE

April 10, 2019, 11:49 pm
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Part Number:BQ24070

Hi 

I have a query need your help.

when in supply mode does Q2,Q1 will open, if Q1,Q2 open the IN pin will have the output voltage.

Waiting for your reply.

Thanks 

Star 

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BQ76940： Instantaneous OV alarm after turning on equalization

April 11, 2019, 12:11 am
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Part Number:BQ76940

   In the case of charging, I turned on the equalization function of CB6, but the OV protection was instantaneous. The threshold of my OV setting is 4.3V. It can be seen from the PC software that the voltage of the 5th string has reached 4.7v, but I checked with a multimeter and found only 4.2v. How can I solve this problem?

 

 

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BQ24296M: BQ24296M Standalone

April 11, 2019, 12:20 am
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LP8860-Q1: Disabling the driver

April 11, 2019, 12:17 am
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Part Number:LP8860-Q1

I have a question about the part LP8860, which is used in a backlight board.

From the DS of the part, we have information about what happens when VDD/EN is 1.65v to VDD (chapter 6.8 logic interface characteristics).

What happens when the Vdd/En is 1.5v to 0v? i.e what happens when the driver is disabled? How driver’s disabling influence an SPI bus?

In our case, the led driver in used in a backlight board. We use several led drivers, which are connected to SPI bus together with an EEPROM. All drivers share the same disable signal (input 19 – VDDIO/EN). The EEPROM doesn’t have disable signal. When the drivers are disabled, we can’t access the EEPROM and read from it. The output in output 14 – MISO seems to be forced to a low voltage level.

Thank you,
Yana

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LMR23630-Q1: Spec for ISHDN vs. temp?

April 11, 2019, 12:35 am
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Part Number:LMR23630-Q1

Hi team,

A customer requests ISHDN spec of LMR23630-Q1 for -40deg and 85deg. The datasheet specify the max. 4uA over the range of -40 to 125deg, but do you have each data or plot?

Thanks,

Sam Lee

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UCC23513: Does UCC23513 have DESAT function?

April 11, 2019, 12:41 am
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Part Number:UCC23513

Hi,

Customers want to confirm that if UCC23513 has DESAT function to protect the IGBT.

I found no words mention it in DATASHEET, but maybe the "short-circuit clamping function"? please help us to confirm it.

For reference, I attached the DESAT description of the old part they use. does UCC235131 has the same or similar function?

Thank you!

Best regards

Yuan

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TPS56339: Die Size

April 11, 2019, 1:05 am
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Part Number:TPS56339

Hi team,

Can I please have some details on the process used and die size for the TPS56339? Happy to discuss Offline. 

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TPS22925: TPS22925 - Maximum ratings of Vout?

April 11, 2019, 1:28 am
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Part Number:TPS22925

Hi,

I normally wanna use the TPS22925 with a battery of 3.6 volts, but I have a additional USB plug in my device. So when the USB cable is plugged, it will turn off the TPS22925 directly and the 5 volts of the USB will be the power source for the load. Now the reverse current blocking of the TPS22925 turns on. My question is, if it is alright to have 5 volts (or a bit more) of the USB at Vout when the TPS22925 is turned off?

Best regards and thank you

VR

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Literature for Voltage Supervisors (Brownout detectors) Design

April 11, 2019, 1:42 am
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I'm looking for some literature concerning the design of Brownout detectors with different topologies

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TLC5923: can I parallel all the 16 channels to get 1.2A output current

April 11, 2019, 1:46 am
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Part Number:TLC5923

Dear LED driver expert,

My customer wants to get a 1.2A output current with our TLC5923 16 channels parallel. The voltage for LED is around 7.5V. If the answer is yes, they want to how can we protect system if the LED is open. Should we use XERR signal to turn off TLC5923? Thanks.

BRs,

Binbin

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TPS92691-Q1: apllication issue

April 11, 2019, 1:52 am
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Part Number:TPS92691-Q1

hi E2e,

The schematic is as follow. We use TPS92691QPWPQ1 to drive 8 LEDs. Rated current 1A, maximum current 1.5A. The main problem is that when the LED lights up, there will be buzz on the PCB board (near the chip), please help  to analyze the reasons. Thank you.

BRs,

Yuan

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LM5010: When using LM5010 to do"input=52V, output=24V", the inductance makes a sound.

April 11, 2019, 1:59 am
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Part Number:LM5010

Hi team,

      My customer use LM5010, when input=52V, output=5V, it work well.

But when input=52V, output=24V, the inductance makes a sound, teh inductance is 220uH, shown in below SCH and layput. Do you have any suggestions?

Thanks!

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BQ27Z561: Asking for the BQ27Z561 technical question

April 11, 2019, 2:04 am
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Part Number:BQ27Z561

Hi Team,

Customer is planning to evaluate bq27z561.

Would you please help to check Temperature coefficient parameter (Cell Temperature Model) for below 10K NTC?

 NTC : NCP03XH103F05RL 

 

BR,

SHH

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TPS65266: Schematic review in the datasheet

April 11, 2019, 2:08 am
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Part Number:TPS65266

I'm looking at the TPS65266 data sheet.

In Figure 32, a 22uF capacitor is applied to C7, C8, and C9, but there is no GND indication connected to the capacitor.

Please review.

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TPS2492: Turn MosFet OFF at short circuit

April 11, 2019, 2:11 am
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Part Number:TPS2492

Hi

I have a problem with turning transistor OFF at short circuit.

When the fault timer reach 4V and the transistor should be switched off then it just tries but fails to do so.

The current limit is approximately 22A. shunt resistor 2,2mOhm.

Transistor is Infineon IAUT240N08S5N019

The constant power limit is approximately 125W  (I have tried with less and still had the same behaviour).

Is there any suggestions what I shall try to test to solve this issue or may be what the problem is.

attach two oscilloscope pictures to show the problem I have

Yellow: voltage at the source 5V/div

Orange: Current 20A/div

Blue: Voltage at timer capacitor 1V/div

Both pictures shows the same scenario but with different time/div

Best Regards

Staffan Johansson 

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LMZ36002: Land Pattern

April 11, 2019, 2:12 am
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Part Number:LMZ36002

Hello team,

 

Can you help to clarify the purpose of the soldermask defined pads in the LMZ36002 footprint (datasheet page 37)?

 

My customers design allows via-in-pad, so they would like to eliminate the hatched areas in the image below, use the highlighted areas as the Cu pads, and put vias in the pads.

 

Do you see any thermal issues with this? 

 


 

 

Thanks!

Errol

Texas Instruments

Field Applications Engineer

 

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TPS74401: Bias Pin Voltage

April 11, 2019, 2:14 am
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Part Number:TPS74401

Dear Sir/Madam,

 

I am using TI’s LDO “TPS74401” for Vin=1.8V, Vout=1.0V, Iout=1A. Below is the schematic design

 

Unfortunately, we have connected IN and BIAS together, whereas the Vin = 1.8V. The same supply goes to the BIAS pin.

Hence we do not get any regulated Output.

Do you have any solution/alternate part which works with BIAS voltage of 1.8V or we have to go ahead with PCB re-work?

 Thanks & Regards

Shekhar S K

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TLC5955: How to estimate min. regulated output current?

April 11, 2019, 2:22 am
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Part Number:TLC5955

Hi Team,

I would like to estimate minimum value of constant current output. Is it possible to control 100uA-150uA range by TLC5955?

Regards,

Kotaro Yamashita

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TPS74401: BIAS Pin Voltage

April 11, 2019, 2:25 am
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Part Number:TPS74401

I am using TI’s LDO “TPS74401” for 1.8V to 1.0V conversion @ 1A,

Unfortunately, we have connected IN and BIAS together, whereas the Vin = 1.8V. The same supply goes to BIAS pin.Hence we do not get any regulated Output.

Do you have any solution/alternate part which works with BIAS voltage of 1.8V?

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UCC39002: UCC39002: UCC39002 + PMP5236 - Power supply unstable at low load

April 11, 2019, 2:29 am
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