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TPS2373: TPS2373-4RGWR cannot work with 19V POE

May 3, 2019, 2:04 am
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Part Number:TPS2373

Dear Sir/Madam,

One of my customer is using TPS2373-4RGWR for POE function. He mentioned the part TPS2373 work normally with POE. 

But they faced problem to work with 19V POE. Is there any suggestion for pin compatible device that work with 19V POE? 

Best regards,

kpk

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BQ25703A: bq25703_

May 3, 2019, 2:23 am
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Part Number:BQ25703A

can we power the system and the battery with different voltage?
how?
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LM5045: Running in Open loop

May 3, 2019, 2:27 am
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Part Number:LM5045

I need support in running the LM5045 in open Loop mode. i.e. my application is to get a varying duty cycle Full Bridge Circuit Output using a trimpot. 

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

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BQ34110: FC not set at the end of charge

May 3, 2019, 2:32 am
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Part Number:BQ34110

Hello,

I'm using a Nimh dT/dt as event for end of charge detection. (I'm using the FC bit to stop the charger.)

I had a strange issue that I didn't had previously: at the end of one charge, the FC didn't set and I overcharged my battery.

Is it a bug or does something in my configuration prevents the FC bit to be set at the dT/dt event?

(I attached the datalog file and the last gg.files from the autoexport)

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

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TPS62291: TPS62291 Voltage rating

May 3, 2019, 2:39 am
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Part Number:TPS62291

Hi TI,

My customer found damages in the test of using TPS62291.

The output of TPS62291 is disconnected from system using P-ch FET(like a load switch) in standby mode because of Iq.

At the same time, The output of LDO is connected to system. 

They are controlled using MCU and simultaneously turn on for 500usec because of turn on time.

I request schematic review whether there is some problem. 

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TPS2120: Setting current limit beyond Rlm reccomended values

May 3, 2019, 2:42 am
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Part Number:TPS2120

Hi,

i'm working on circuitry validation with my client & we're looking into potential methods to reduce current limit of TPS2120 to 650mA, but according to Ilm formula the Rlm recommended value not to exceed 100kOhm. Hence i would like to know if there's any other variables i should look into to meet my target current limit? Also what may the potential implications i face if i go beyond 100kOhm for Rlm? Thanks.

Regards,
Leo

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TLV61046A: Minimum on time

May 3, 2019, 2:51 am
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Part Number:TLV61046A

Hi TI,

This design uses a TLV61046A to boost a 3.6V to 4.4V output at 70mA. 

If the regulator is unloaded, it comes up and regulates fine. However, the regulator cannot bring up the 70mA load.

If duty cycle is lower than the minimum on time, output voltage can be dropped?

Datasheet shows the minimum on-time 150~250ns.

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BQ34Z100-G1: Design Energy above Register Maximum

May 3, 2019, 3:30 am
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Part Number:BQ34Z100-G1

Hello E2E-Community, 

I'm preparing a 7s6p-Pack with 3450 mAh Cells. The nominal pack voltage is 25.2V (the maximal 29.4V)

I've calculated 20700 mAh for Design Capacity. And 521600 mWh (20700 mAh * 25.2 V) for Design Energy. 

The max Value of this Register is 32767 mWh. I've already noticed the scale factor, but even if this is set (521600/10 = 52160 mWh) the Value is beyond the maximum value defined for this parameter. 

Is there any workaround on this? 

Thank you and best regards, 

Felix

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CSD87501L: CSD87501L BGA ball height

May 3, 2019, 3:50 am
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Part Number:CSD87501L

Hi Team,

Could you please help provide CSD87501L BGA ball height information?

see attached file red circle, that only shows the height with IC body, could you please add BGA ball height ? 

Best regard,

Daisy Yang

 

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TPS92610-Q1: Datasheet value overlaps

May 3, 2019, 4:16 am
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Part Number:TPS92610-Q1

Hi Team,

Need clarification on below point in datasheet.

The max of V_IL_Diag / V_IL_PWM and min of  V_IH_Diag / V_IH_PWM overlaps, which will create a grey state of driver at some voltages. Can you clarify if the data provided in datasheet is correct or not?.

Regards, Shinu Mathew.

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TL4242-Q1: Need .STP file

May 2, 2019, 11:21 pm
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BQ34Z100-G1: BQ34Z100-G1 : Problem with Learning cycle of bq34z100g1

May 2, 2019, 11:22 pm
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Part Number:BQ34Z100-G1

Hi,

We are using BQ34Z100-G1 in our BMS who should be configurable for any of Li-ion/NMC batteries.

For any new configuration, I need to conduct a SOC learning. This does not work always. I'm using Battery management Studio (bqStudio) 1.3.5.4.1.

I noticed that the SOC learning works only when this register Registers\Control shows a value of 0x0016:

I have no idea who drives this register?

Thanks in advance for your help.

Naid

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EM1402EVM: Single board with Cell to pack

May 2, 2019, 11:41 pm
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Part Number:EM1402EVM

Hi there, we are manufacturer of Low Voltage 48V 16s LiFePo4 Energy Storage solutions and currently developing replacement of our old Bms (MAX14921 with passive balancing) to active balancing,  What is the easiest conversion from the existing design of EM1402EVM to work in single BMS board mode and capable of moving energy from pack to cell and cell to pack. Also is it possible to use EM1402EVM without 12 battery in stack with 2 or more BMS to transfer cell to 12 and 12 to cell (PACK(n) cell (m) to PACK(o) cell(p))?

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TPS23753A: PoE RJ45 data line TVS

May 3, 2019, 12:21 am
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Part Number:TPS23753A

Hi Darwin,

Do you consider that we need add TVS protection on PoE RJ45 data line?

Do you have any suggestion parts of TVS on PoE RJ45 data line?

Thanks!

Sincerely,

Chin

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TPS53681: Unused Pins

May 3, 2019, 5:57 am
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Part Number:TPS53681

Hi Team,

Customer is using TPS53681RSBT in current design and not using below mentioned pins/signal, where to connect these pins when they are not used. 

PIN No

PIN NAME

16

BVR_RDY

20

BVR_EN

29

BCSP2

35

BTSEN

1

BPWM1

Please help with your inputs. Thanks in advance for your support.

Regards, Shinu Mathew.  

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SM72295: Frequency response of integrated current sense amplifiers

May 3, 2019, 6:21 am
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Part Number:SM72295

Team, 

Where can my customer locate frequency response of integrated current sense amplifiers on SM72295?

Thanks!

Viktorija

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UCC28633: Vdd(OVP) detector bandwidth

May 3, 2019, 7:13 am
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Part Number:UCC28633

Ulrich, I would still be interested to know what the rough bandwidth of the Vdd(OVP) detector is. This would also be a useful spec to add to the datasheet, in addition to the minimum output capacitance PID-loop dominant pole requirement.

I suspect that the detector is pretty wideband, which would require an adequate margin of safety to prevent spurious tripping due to feedforward (Miller cap effect) through the FET gate driver for example. This type of transient induced on Vdd during FET switching transitions might be a few tens of ns in width typically. Can you confirm that this narrow a transient on Vdd could trip Vdd OVP? This would be useful to know with certainty.

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TPS63802: UL Cert questions Related to FMEA Failure Analysis

May 3, 2019, 7:26 am
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Part Number:TPS63802

Hi,

Any ideas to help us with the buck/boost.  See UL comments and my comments below.

Questions for you:

    • How high can the output of the TPS63802 be if voltage at FB is same as VOUT?
    • How can VOUT be coupled to EN?

Buck/boost converter:

    • [UL] The issue stems from the fact that the resistors in the resistor divider network, used to provide a feedback voltage to the FB line, can be faulted to any value.
    • [Me] The concern is, when resistor is faulted, the output of the boost can be indefinitely high.  If the resistors meet requirements as infallible component, will the set output voltage be considered max values?  This was viewed as acceptable by our consultant.  Even if the resistor is infallible, it can still be failed to an open circuit by using a countable fault. See clause 8.5 of UL 60079-11 for more details

The concern is if the feedback divider resistor going is open – output of boost can be indefinitely high. 

    • [UL] In order to accomplish clamping of your boost regulator for intrinsic safety analysis, you will need to clamp the VOUT, FB, and EN pins.
    • [Me] Why FB and EN?  VOUT is clamped regardless of what happens to FB, we can increase the resistor value on EN.

Thanks!

Blake

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LM5067: Check a Design Review & Test Waveforms.

May 3, 2019, 7:37 am
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Part Number:LM5067

Hello

My Customer reqeust a design review the LM5067 circuit.

I attached a Test Waveforms.

Please Check a below data.

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

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TPS22990: Back feed from output to input?

May 3, 2019, 7:44 am
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Part Number:TPS22990

Hi Gurus!

I'm considering using the TPS22990 as a switch to select between to power supply outputs to a common rail.  My question is, is the device back-feedable?  For example, if there is a voltage on the output while there is no voltage on the input, will the output voltage run through the body diode of the FET show in the function block diagram, page 16 of http://www.ti.com/lit/ds/symlink/tps22990.pdf ?

Then, how do I make sure I am not ordering the part with the option discharge path?

Thanks so much for your insights!

Keith.

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