TPS40422: May I have some confirming item for TPS40422 application ?

October 24, 2019, 2:53 am

≫ Next: LM5146-Q1: Understanding current Limit pin functionality (ILIM)

≪ Previous: TPS61169: Minimum PWM On-Time Requirement

Part Number: TPS40422

Dear SIR:

Good day!!

May I have some confirming item for TPS40422 PMBUS interface application ?

We can not found any PMBUS in our MB (Chip ,....),But ,We have found SMBUS interface .

We want to know ,Can we connect SMBUS to TPS40422 PMBUS interface ?

If could ,would you have any advice for "How to select SMBUS for connect to TPS40422 PMBUS interface"

(Becasue we don't know what kind of SMBUS can connect to TPS40422 PMBUS interface)

<ex:We need select "Master type SMBUS ,Slave Type SMBUS" ,We need select "2 pin type SMBUS(SCL ,SDA) ,3 pin Type SMBUS (SCL ,SDA,Alert) ,SMBUS version,.....

....any other select item need to confirming" >

Thanks

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LM5146-Q1: Understanding current Limit pin functionality (ILIM)

October 24, 2019, 3:18 am

≫ Next: TPS92682-Q1: gate source resistor

≪ Previous: TPS40422: May I have some confirming item for TPS40422 application ?

Part Number: LM5146-Q1

Hi,

I could see that the datasheet says RILIM is the current limiting resistor and the current from the internal current reference flows through it.

It is also mentioned that "A current limit comparator on the ILIM pin prevents further SW pulses if the ILIM pin voltage goes below GND."

What is the possible scenario where the voltage at ILIM pin goes negative?

Let us say, I need a current limit of 10A, how do I select the resistance value? I don't think the datasheet guides on this in detail.

Thanks,

Siri.

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TPS92682-Q1: gate source resistor

October 24, 2019, 3:35 am

≫ Next: Compiler/LM5146-Q1: Error Preparing Shape List

≪ Previous: LM5146-Q1: Understanding current Limit pin functionality (ILIM)

Part Number: TPS92682-Q1

Hi,

In the TPS92682-Q1 is there an internal gate-source-resistor between Pin22 and GND?

Regards,

Jon

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Compiler/LM5146-Q1: Error Preparing Shape List

October 24, 2019, 3:58 am

≫ Next: TPS2546: Overcurrent behavior

≪ Previous: TPS92682-Q1: gate source resistor

Part Number: LM5146-Q1

Tool/software: TI C/C++ Compiler

Hi,

I want to create a symbol by loading a macro of LM5146-Q1 IC into TINA. It is the

LM5146-Q1 Unencrypted PSpice Transient Model

downloaded from TI.

As soon as I add the macro and go next, it says the following error - "Error preparing shape list".

Can you please help me in resolving this?

Regards,

Siri.

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TPS2546: Overcurrent behavior

October 24, 2019, 4:49 am

≫ Next: BQ40Z50-R2: Measuring low currents

≪ Previous: Compiler/LM5146-Q1: Error Preparing Shape List

Part Number: TPS2546

Hi,

Based on the datasheet, the complete shutdown occurs only if the over current condition last for long time enough to trigger thermal limiting. So, we should not expect Vout become 0V immediately when a overcurrent load is applied.

Meanwhile, can you check if the behavior as below when the overcurrent load is added to the output of TPS2546?

CH1: TPS2546 OUT voltage

CH2: TPS2546 OUT current

THanks!

Antony

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BQ40Z50-R2: Measuring low currents

October 24, 2019, 5:01 am

≫ Next: BQ76930: My bq76930 i2c doesn't respond to the host

≪ Previous: TPS2546: Overcurrent behavior

Part Number: BQ40Z50-R2

Hello all,

I would like to know if with the maximum recommended sense resistor of 3mR we are able to measure reliably discharge current in a few mA range ?

With 3mR, the reference is 0.1215V (Vref1/10) 1mA is 8 of 32767... or about 30uV.

Is this ok ? Or do we need to use a bigger sense resistor ? Nominal current is less than 1A (in both directions) and max short circuit 3-5 amps.
But in the datasheet it's mentioned using 1 to 3mR.

Thanks !

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BQ76930: My bq76930 i2c doesn't respond to the host

October 24, 2019, 4:18 am

≫ Next: TPS65311-Q1: the Maxim current of Buck 1

≪ Previous: BQ40Z50-R2: Measuring low currents

Part Number: BQ76930

Hi, my name is sam, I create a prototype for BMS using IC BQ76930, I read the datasheet and some technical support documents from TI, but I got a problem.

I tried to communicate between the prototype BQ76930 and Arduino as a host via I2C, I found that IC BQ76930 did not respond at all, I tried to measure the voltage on several IC pins, I found that the REGOUT IC pin does not issue the voltage that it should

this is my schematic :



I appreciate all the answers given, thanks.

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TPS65311-Q1: the Maxim current of Buck 1

October 24, 2019, 4:26 am

≫ Next: TPS65311-Q1: The maximum current of Buck 1

≪ Previous: BQ76930: My bq76930 i2c doesn't respond to the host

Part Number: TPS65311-Q1

Hi,

When TPS65311-Q1 's buck 1 is configured to output 3.3V, what's the maximum current of Buck 1 which can be achieved with 4-40V input?

Thanks.

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TPS65311-Q1: The maximum current of Buck 1

October 24, 2019, 4:44 am

≫ Next: TPS65311-Q1: THE MAXIMUM CURRENT OF BUCK 1

≪ Previous: TPS65311-Q1: the Maxim current of Buck 1

Part Number: TPS65311-Q1

Hi,

what's the maximum current of Buck 1 of TPS65311-Q1, configured as 4-40V input and 3.3V ouput?

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TPS65311-Q1: THE MAXIMUM CURRENT OF BUCK 1

October 24, 2019, 5:03 am

≫ Next: TPS25940: unused pin connection

≪ Previous: TPS65311-Q1: The maximum current of Buck 1

Part Number: TPS65311-Q1

HI E2E,

Is it possible to get 3.3V output with 3.4A current, when input is 4-40V?

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TPS25940: unused pin connection

October 24, 2019, 5:11 am

≫ Next: UCC28070: when Tj is larger than 125C and lower than 160C, does UCC28070 shut down?

≪ Previous: TPS65311-Q1: THE MAXIMUM CURRENT OF BUCK 1

Part Number: TPS25940

Hi,

my customer need a USB current limit switch like TPS2553 but with features below:

1. reverse current blocking when disabled

2. The output can withstand up to 18V surge.

TPS25940 can meet the customer's needs but it has much more functions that is not needed by the customer. So for the unused pin I would like to know if below configuration is okay and if my understanding is correct:

1. DEVSLP connected directly to GND without a resistor, and it means the device will never go into sleep mode. ?

2. PGOOD left floating

3. PGTH connected directly to GND without a resistor, and it will make the device think the power is not good but the device won't react to the NO GOOD. ?

4. EN/UVLO connected directly to the GPIO of MCU.

5. OVP connected directly to GND without a resistor, and it means the device is not in overvoltage protection. ?

6. dVdT left floating. Floating equals C=0 or C=infinite?

7. IMON left floating

8. FLT left floating.

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UCC28070: when Tj is larger than 125C and lower than 160C, does UCC28070 shut down?

October 24, 2019, 5:26 am

≫ Next: LMR64010： LMR64010 SW pin rating

≪ Previous: TPS25940: unused pin connection

Part Number: UCC28070

customer do extreme test in their product, they find when UCC28070 case temperature is 120C, UCC28070 will shut down.

in datasheet, It shows that when UCC28070 Tj is higher than 160C, chip will shut down.

1. so customer want to know the 160C accuracy, they want to know if UCC28070 will shut down when Tj is in the range of 125C and 160C?

2. when Tj is higher than 125C, the parameter data may be out of range, so customer want to know, when Tj is in the range of 125C and 160C, is there any risk that their circuit damage or PFC circuit has some issue?

thanks.

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LMR64010： LMR64010 SW pin rating

October 24, 2019, 4:41 am

≫ Next: BQSTUDIO: Can't enter CC Gain value in BQStudio

≪ Previous: UCC28070: when Tj is larger than 125C and lower than 160C, does UCC28070 shut down?

Part Number: LMR64010

Hi all,

We want to use a 12V to 40V boost converter and already choose the LMR64010.

However, we found that the SW pin rating is only 40V and the datasheet also say that this converter can output to 40V.

But before the output voltage, it should add a schottky diode.

Then it means this boost converter can never boost to 40V, right?

Looking forward to your reply.

Best regard,

Jin

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BQSTUDIO: Can't enter CC Gain value in BQStudio

October 24, 2019, 5:33 am

≫ Next: TPS54331: TPS54331 Schematic check

≪ Previous: LMR64010： LMR64010 SW pin rating

Part Number: BQSTUDIO

Hello,

I try to initialize the BQ27750 present on my custom board in order to measure the remaining capacity of my Battery in real time. On my board, there is a 10mOhms shunt resistor.

I have followed the "CC Gain/Capacity Gain Calibration" procedure described in the 10.3.3 (page 47) section of the BQ27750 Reference Manual (sluubi6a). After some measurements, I find a CC Gain of 0.000315 (with Icc = 105mA and ADCcc = 333).

But I can't enter this value in BQStudio and I don't know what value I should enter. Could somebody please help me ?

Thanks.

Regards.

Malo

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TPS54331: TPS54331 Schematic check

October 24, 2019, 5:35 am

≫ Next: LM2599: LM2599 in Lead-free reflow profile

≪ Previous: BQSTUDIO: Can't enter CC Gain value in BQStudio

Part Number: TPS54331

Dear friends,

Please help check the schematic of TPS54331. Vin=5V, Vout1=3V3, Vout2=1V2. For now, no 3V3 and 1V2 in the output. Thanks.

This is used to power the F28377D DSP.

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LM2599: LM2599 in Lead-free reflow profile

October 24, 2019, 5:47 am

≫ Next: LM5060: schematic check

≪ Previous: TPS54331: TPS54331 Schematic check

Part Number: LM2599

Dear Sir,

since 10 years ago, we use voltage regulator LM2599 in 2 versions :

- LM2599SX-5.0/NOPB

- LM2599SX-ADJ/NOPB

These réfs are soldered on our PCB in a leaded reflow profile ( T peak < 220 °C ) without any problem…

For a new design, we have to use a lead-free reflow profile with a SAC305 solder paste.

The results are conform for all smd devices on the board, except for the LM2599 :

The D2PAK package have brown pins after reflow, but only on SAC305 process ( see photos, and reflow profile ).

As specified in the LM2599 ordering code, Lead finish is CU SN.

- Is this phenomen normal ?

- Why this fault appears only on LM2599 package ?

Thanks for your answer.

Best regards

(Please visit the site to view this file)(Please visit the site to view this file)

Jean-Pierre Mérienne

Mail : jpmerienne@hydequip.fr

Tél : 02.31.22.85.15

Fax : 02.31.22.85.07

Route d'Audrieu

14400 Bayeux

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LM5060: schematic check

October 24, 2019, 6:00 am

≫ Next: TPS23755: TPS23755

≪ Previous: LM2599: LM2599 in Lead-free reflow profile

Part Number: LM5060

Hi, my customer uses LM5060 for high side MOSFET turn on/off and overcurrent protection.

1. When calculating the OCP threshold, VOFFSET ranges from -7mV to +7mV which has great influence. How can we know the exact VOFFSET of each device?

VDSTH = (RS x ISENSE) - VOFFSET

2. In datasheet 8.2.3.2.1 Reverse Polarity Protection With a Resistor

In case B, Ro(min) is related to Rs.

In 8.2.3.2.2 Fault Detection With RS and RO

Rs is related to Ro.

So for case B, the calculation process is: I set Rs first, and then calculate Ro(min), then choose appropriate Ro, then recalculate Rs as the final value, right?

3. Are there any risk of the schematic above?

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TPS23755: TPS23755

October 24, 2019, 6:08 am

≫ Next: TPS57140-Q1: Reference voltage discrepancy within the TPS57140-Q1 datasheet

≪ Previous: LM5060: schematic check

Part Number: TPS23755

Hi Sir,

May I a question about output voltage is 12V? could we modify transformer to get higher rating likely 16 or 18V etc..

Or, fixed 12V only? Because my customer would like have higher output for speaker project if necessary.

Thanks, Ian.

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TPS57140-Q1: Reference voltage discrepancy within the TPS57140-Q1 datasheet

October 24, 2019, 6:14 am

≫ Next: TPS92691EVM-752: TPS92691-Q1 output short circuit question

≪ Previous: TPS23755: TPS23755

Part Number: TPS57140-Q1

Good morning,

I am reviewing using the TPS57140-Q1 ( or TPS57160-Q1) in an application where I require a relatively tight controlled voltage for the 1v2 and the 3v3. The TPS57140-Q1 is attractive due to the datasheet stating a 1% accurate reference. However, aspects of the datasheet seem to be in conflict.

Page5:

Voltage reference:

MAX 0.808:

TYP: 0.8

MIN: 0.792

This produces a 0.8V +-1%

However, page 14:

7.3.5 Voltage Reference The voltage-reference system produces a precise ±2% voltage reference over temperature by scaling the output of a temperature-stable band-gap circuit.

a +-1% (using 0.1% resistors, aging and temperature coef) produces a possible worst-case voltage of: 3.2430 -> 3.3578 (also: 1.1842 -> 1.2160)

while +-2% (using 0.1% resistors, aging and temperature coef) produces a possible worst-case voltage of: 3.2102 -> 3.3910 (also: 1.1722 -> 1.228)

Could the tolerance of the TPS57140-Q1 be confirmed: 1% or 2%.

The reason this is key is a tolerance stackup involving the TPS3703E4080 and an external resistor divider to permit testing.

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TPS92691EVM-752: TPS92691-Q1 output short circuit question

October 24, 2019, 6:22 am

≫ Next: TLC59116: LED Output in parallel with Transistor driver

≪ Previous: TPS57140-Q1: Reference voltage discrepancy within the TPS57140-Q1 datasheet

Part Number: TPS92691EVM-752

Hello team,

May I know TPS92691 have output short circuit protection? and how to implement the protection?
Since we dircet short output test on TPS92691EVM-752 and find DDRV pin voltage level from 7.5V change to 5.4V cause Q1 FET not turn off.

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