The PID parameters of Filter have up to 6 sets of data( Limit 0~5 ), and the control parameters are switched by judging the size of the input error. In the switching process:

1. Principle and design of switching, which is realized through analog or digital mode? The error comparison is using a comparator or something else?

2. Is there any special treatment to prevent toggle error and parameter loading error?

3. Is the switching process direct loading of new data or a gradual process?

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BQ76930: Behavior in shipping mode and changed cell configuration

October 8, 2018, 2:58 am

≫ Next: RS232 request

≪ Previous: CCS/UCD3138: The reliability of Filter loop parameter switching of UCD3138 needs to consult you, hoping to provide a clear basis and data

Part Number:BQ76930

I would like to use the bq76930 to monitor a cell pack with a 10s1p configuration. The pack can enters (and also leave) in a special operation mode, the bq76930 switches to the SHIP Mode and after that the cell configuartion is changed. In this special mode the new arrangement of the 10s configuration is separated in two 5s configurations and connected parallel to each other. So that port VC10 is conneted with cell 10 and cell 5 and port VC5 (-b; -x) is connected with ground of cell 6 and ground of cell 1.

Can the BMS chip be damaged by this re-configuration of the pack during the bq76930 is in SHIP mode?

Tanks for your help

Marcel Bullen

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RS232 request

October 8, 2018, 3:19 am

≫ Next: TLV62569: Both High-side and Low-side MOSFET Short Issue

≪ Previous: BQ76930: Behavior in shipping mode and changed cell configuration

Hi TI，

would you please recommend a solution ，we want to convert UART which the level is 1.8V to 12V RS232

thanks

B&R

peiyuanqing

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TLV62569: Both High-side and Low-side MOSFET Short Issue

October 8, 2018, 3:45 am

≫ Next: TPS2400: Recommenaded Ambient Temp

≪ Previous: RS232 request

Part Number:TLV62569

Hi, Team

My TV customer is using TLV62569 in their TV board to provide core power of processor RK3128H.

The input voltage is 5V, and output voltage is 0.954V ~ 1.395V. CPU controls the output voltage by 200kHz PWM signal.

Customer manufactuer 200 units and find 1 units failure. Both high-side and low-side MOSFET of TLV62569 are shorted.

Here is customer schematic. Could you help to check whether there is any issue? What is the posible cause?

Thanks

Kevin

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TPS2400: Recommenaded Ambient Temp

October 8, 2018, 3:59 am

≫ Next: TPS55340: support input voltage to 2.7V

≪ Previous: TLV62569: Both High-side and Low-side MOSFET Short Issue

Part Number:TPS2400

Customer doesn't find the recommended ambient temp. it's important for customer used.

application: AC drive/VFD

Customer: WW

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TPS55340: support input voltage to 2.7V

October 8, 2018, 4:02 am

≫ Next: How to decode the body marking on TLV2548CDWR; please advise the Date Code

≪ Previous: TPS2400: Recommenaded Ambient Temp

Part Number:TPS55340

Customer is looking for a boost converter that can support 2.7V to 12V/1A.

Competition: LTC1871 . Thanks.

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How to decode the body marking on TLV2548CDWR; please advise the Date Code

October 8, 2018, 2:44 am

≫ Next: UC1843: UVLO ambiguity in datasheet.

≪ Previous: TPS55340: support input voltage to 2.7V

Please advise the date code reflected on the body marking received for TI: TLV2548CDWR

It reads: 56D07 JT
2548C

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UC1843: UVLO ambiguity in datasheet.

October 8, 2018, 3:22 am

≫ Next: Problems with the output LM25118

≪ Previous: How to decode the body marking on TLV2548CDWR; please advise the Date Code

Part Number:UC1843

Datasheet [SLUS223E –APRIL 1997–REVISED JANUARY 2017] quotes UVLO values listed against the various part numbers, but I cannot tell which row corresponds to the UC1843. The row titles are ;

Row-1 = UCx842/4 UC184x and UC284x.

Row-2 = UCx843/5 UC384x

Row-3 = UCx843/5

The trouble is that I can match UC1843 into all three rows so cannot tell which row is correct, have I missed something?

Row-1 UC184x could be UC1843.

Row-2 UCx843/5 could be UC1843.

Row-3 UCx843/5 could also be UC1843.

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Problems with the output LM25118

October 8, 2018, 4:36 am

≫ Next: TPS23754: Adapter ORing with PoE preference acc. slva306a

≪ Previous: UC1843: UVLO ambiguity in datasheet.

ello Community, Currently I am working with the chip LM25118 which outputs is fixed by a variable input voltage.

This function works perfectly when idling without load. For a load connection that needs a bit of power, the output voltage drops to a lower value than set.


Does anyone have any idea why this could be?

The oscilloscope image shows the voltage values at the Rsense.

This is the circuit for the board.
At the FB-pin is a potentiometer, so that the voltages 12 V and 24 V can be realized. (That is not Show in this circuit.)

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TPS23754: Adapter ORing with PoE preference acc. slva306a

October 8, 2018, 4:41 am

≫ Next: UCC28700: UCC28700

≪ Previous: Problems with the output LM25118

Part Number:TPS23754

Hello,

we need PoE priority as discussed in section 3.2 of slva306a, using the diode Dvdd. This diode lowers efficiency and we were wondering whether we could use an ideal diode based on a MOSFET instead? With 802.3at the diode will dissipate app. 350 mW (0.5V x 0.7A).

Regards,

Michael

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UCC28700: UCC28700

October 8, 2018, 4:47 am

≫ Next: BQ33100: MAC SBS Command Frame Sequence

≪ Previous: TPS23754: Adapter ORing with PoE preference acc. slva306a

Part Number:UCC28700

Hello Sir,

I have to design SMPS with UCC28700 and design specifications as follows

Vin : 250-450 Vdc

and there are multiple outputs as :- 12V,10mA ; 5V,0.6A ; 12V,40mA .

1) can we get multiple outputs using UCC28700 ?

2) will you please give me the design procedure for calculating the values of components ?

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BQ33100: MAC SBS Command Frame Sequence

October 8, 2018, 4:50 am

≫ Next: LM317: mistakes in datasheet

≪ Previous: UCC28700: UCC28700

Part Number:BQ33100

Hello,

I want to Write MAC command to BQ33100,

1. for Lifetime and Capacitor Balancing Enable (0x0021) the sequence will be:

Write Frame: Slave Address(0x16) => MAC (0x00) => SBS cmd (0x0021)

Write Frame: Slave Address(0x16) => MAC (0x00) => DATA 0x01 / 0x00

2. for rest of the MAC commands as there is no data part present, the sequence will be:

Write Frame: Slave Address(0x16) => MAC (0x00) => SBS cmd (0x0024)

as per my understanding; for part 2, we just need to write the command into MAC(0x00) and the action will take place in BQ33100; which is not the case for part 1 , there I have to perform separate i2c write transaction to load the action data into BQ33100

is this understanding correct?

Thanks.

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LM317: mistakes in datasheet

October 8, 2018, 5:13 am

≫ Next: PTN78020W: Switch Output voltage on during operation

≪ Previous: BQ33100: MAC SBS Command Frame Sequence

Part Number:LM317

www.ti.com/.../lm317.pdf

Equations 4 and 6. "+1" would be not in fraction.

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PTN78020W: Switch Output voltage on during operation

October 8, 2018, 5:20 am

≫ Next: BQ24193: Risk with not placing the reserved bit REG07[3] properly + contradication in the datasheet

≪ Previous: LM317: mistakes in datasheet

Part Number:PTN78020W

Hi,

We like to switch the output voltage of PTN78020W between two levels.

We will be changing the Vo adjust resitors values for this.

The device will be working on a particular voltage during the change. The SPDT switches (Like : TS5A3159) will be used for changing the Resistor values.

Please let me know that the voltage change is possible during operation.

What are the points I need to consider for this operation

Thanks

Rejeesh S Raj

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BQ24193: Risk with not placing the reserved bit REG07[3] properly + contradication in the datasheet

October 8, 2018, 6:02 am

≫ Next: TPS5450: Ringing and 2V p-p noise on output

≪ Previous: PTN78020W: Switch Output voltage on during operation

Part Number:BQ24193

Hello,

In a battery powered device, we use the BQ24193 component in combination with a single cell battery. In this design, we sometimes (quite rarely actually) encounter a situation where we want to go into shipping mode (section 8.3.1.2.2 of the datasheet), and it seems that the battery remains activated, and thus our system doesn't power off.

During the power off sequence, our microcontroller sends the power off commands to the BQ24193 through I2C. In particular, this writes a new value to the REG07 register. Looking at our firmware, I noticed that when the REG07 value is sent to the component, the REG07[3] bit is '0', while this is a reserved bit that must be '1' (which is obviously a mistake). Since the problem we encoutner is very rare I don't manage to reproduce it.

My question is the following: Is it possible that the wrong value of the reserved bit REG07[3] would explain that the BATFET doesn't alway open to switch off power ?

Additionnally, I noticed the following contradiction in the datasheet:

- Page 13 and 30, it is written that the watchdog timer is disabled with REG05[5:4]=00 (or at least that's what I understand).

- Page 25, it is written that the watchdog timer is disabled with REG05[5:4]=11 (or at least that's what I understand).

It would be nice to have confirmation of which setting disables the whatchdog, because if the whatchdog remains activated this could also explain my issue.

Thank you and best regards,

Thomas

↧

TPS5450: Ringing and 2V p-p noise on output

October 8, 2018, 6:03 am

≫ Next: BQ27532-G1: Default Firmware for BQ27532-G1 bqfs, dffs

≪ Previous: BQ24193: Risk with not placing the reserved bit REG07[3] properly + contradication in the datasheet

Part Number:TPS5450

Hi,

I'm working on a design based on the WEBENCH and TPS5450 converter. My issue is that I'm getting >2v p-p noise on output. I used the simulator but my real world results are troubling.

Specs

- 24V input
- 3.5A output
- 5V output

Components

- L: 12uH/23mR/ - SRR1260-120ML
- Cin: 20uF/20mR - GRM32ER71H106KA12L x 2
- Cout: 330uF/17mR - 6SVPC330M
- D: 5A/60V/100pF - SBR5E60P5-13

Circuit

Problem

I'm getting 2V p-p noise on the 5V output. Also visible on inductor. Please see waveforms:

Solutions attempted

- Adding a 24R in series with Cboot
- Adding a snubber network (5R/110pF)
- Changing D to a B340AF-14

This helped but nothing like what it should. I wonder if it is the PCB but in all honesty have never experienced such an issue with a switching converter. Can it really be that sensitive?

Thanks for the support

Kind regards,
Charlie.

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