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UCC28951-Q1: GENERAL STARTUP QUESTIONS

April 6, 2019, 11:07 pm
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Part Number:UCC28951-Q1

SIR,

I AM GOING TO SWITCH FROM THE UCC28950 TO THE UCC28951-Q1 DUE TO THE UVLO.  I WOULD LIKE TO ASK A COUPLE OF QUESTIONS REGARDING THE UCC28951-Q1 IC.

I have seen in the forum the following statement:

"If there is no input voltage to the power train and VCC is applied to the UCC28951-Q1 controller then the OUTA, OUTB, OUTC and OUTD signals will be present. Each of them will be at 50% duty cycle - less a little to allow for the dead times you have programmed. The controller will operate at Dmax because the output is below its set-point."

I BELIEVE I UNDERSTAND THAT STATEMENT.

I AM IN THE PROCESS OF A DESIGN THAT WILL NOT BE USING THE SR PINS AT FIRST,WILL USE SCHOTTKY DIODES IN THE OUTPUT STAGE. 

Vin = 150V, Pout = 600W, Vout = 27V,

Question #1  --  IF I AM NOT GOING TO USE THE SR OUTPUT (Pin #18 Out E and Pin #17 Out F), DO I STILL NEED TO INSTALL THE COMPONENTS FOR, I BELIEVE, Pin #14 ADELEF?  SAME QUESTION FOR Pin # 8 DELEF.  I CAN ADD THESE LATER IF IT IS DECIDED?  YES / NO?

Question #2  --  FROM WHAT I UNDERSTAND THE SAME TI EXCEL SPREADSHEET FOR THE UCC28950 IC  IS THE SAME SPREADSHEET USED FOR THE UCC28951-Q1 IC?

Question #3  --  IS THERE SOME FORM OF LITERATURE WHICH MIGHT GUIDE ME IN SOME OF THE CRITICAL VOLTAGES WHICH I WOULD NEED TO BE AWARE OF BEFORE I APPLY VOLTAGE TO THE POWER TRAIN?

Question #4  --  JUST TO FIRE UP THE SIGNAL CIRCUIT, IS THE CURRENT SENSE CIRCUITRY REQUIRED FOR Pin #15 CS?  I DON'T SEE WHERE IT WOULD MATTER UNTIL VOLTAGE IS APPLIED TO THE POWER TRAIN.

Question #5  --  WOULD YOU BE ABLE TO SUGGEST A COMFORTABLE SOFT-START TME AND POSSIBLY DELAY TIME FOR Pin #6 & 7?  MAYBE A BALLPARK FIGURE JUST TO GET THE SIGNAL BOARD UP AND RUNNING?

LOOKING FORWARD TO YOUR REPLIES.  WILL START THE BUILD ON MONDAY.  GET BACK WITH YOU ON FRIDAY.

 

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Ti series

April 6, 2019, 10:57 pm
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  I have a peoject with 32 series of cells using two piece of BQ76PL455A-q1 on a same board now,but there are some problems.Series communication circuit is the same as the manual 'slua785.pdf' described:"1.3 Daisy-Chain (Multiple bq76PL455A-Q1 Devices on Same Board) ",the communication configuration is in accordance with the manual of 'slva617aTI.pdf',but it does not work normal.When I read address of device ,it response with a incorrect data which is '0x26'.What does it mean?Whther it indicate a cetain mistake?How can I get the desired data?

Best regards

geng xiao ming

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BQ76PL455A-Q1: Series communication between two Bq76pl455a-Q1 chips on the same board

April 7, 2019, 2:10 am
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Part Number:BQ76PL455A-Q1

xiaoming geng

Dears:

There are some troubles about series communication between two Bq76pl455a-Q1 chips on the same board.According to the manual about BQ76PL455AQ1,I made the following configuration about series communication.But the expected result did not appear, I am also not sure if there is an communication between the two chips.Please help me to check the configuration,and if it is incorrect please show me how to insolve this problem,ecpecte your response,thanks!

Best Regards!

xiaoming GENG

const uint8_t PWRCONFIG[5]={0xf1,0x0f,0x80,0x55,0xa3};
/*configu for auto-address*/
//const uint8_t COMCONFIG[6]={0xf2,0x10,0x00,0xe0,0x32,0xf5};//Communication Configuration for auto_address125k
const uint8_t COMCONFIG[6]={0xf2,0x10,0x10,0xe0,0x3f,0x35};//Communication Configuration for auto_address250k
const uint8_t ADDR_SEL[5]={0xf1,0x0e,0x10,0x54,0x5f};// auto addressing to select address
const uint8_t AUTO_ADDRESS[5]={0xf1,0x0c,0x08,0x55,0x35};//auto_address mode
const uint8_t CONFIGADDR00[5]={0xf1,0x0a,0x00,0x57,0x53};//confige device 1 to address 0
const uint8_t CONFIGADDR01[5]={0xf1,0x0a,0x01,0x96,0x93};//confige device 2 to address 1
const uint8_t ReadAddress00[6]={0x81,0x00,0x0a,0x00,0x2e,0x9c};//read device 1 address 
//const uint8_t ReadAddress00[6]={0x00,0x00,0x00,0x00,0x00,0x00};
const uint8_t ReadAddress01[6]={0x81,0x01,0x0a,0x00,0x7f,0x5c};//read device 1 address 
const uint8_t HighSideCommDisable[7]={0x92,0x01,0x10,0x10,0x20,0xb5,0xfc};//disable high-side receiver on differential interface on top of stack 
const uint8_t LowSideCommDisable[7]={0x92,0x00,0x10,0x10,0xc0,0xb5,0x88};//disable low-side trasmitter on differential interface on bottom of stack 
/*CLEAR ALL FAULT*/
const uint8_t CLEAR_FALUT_SUM01[7]={0x92, 0x01, 0x52, 0xFF,0xC0, 0x58,0x50};//clear device01 fault,start at top
const uint8_t CLEAR_FALUT_SUM00[7]={0x92, 0x00, 0x52, 0xFF,0xC0, 0x59,0xAC};//clear device00 fault
/*broadcast configuration for AFE*/
const uint8_t SMPL_SLY1[5]={0xf1,0x3d,0x00,0x41,0x63};//initial sampling delay :no delay
const uint8_t Cell_CSPER[5]={0xf1,0x3e,0xbb,0x01,0xe0};//first voltage and internal sampling period :60us
const uint8_t AUX_SPER[8]={0xf4,0x3f,0xbb,0xbb,0xbb,0xbb,0x67,0x33};// first tempe sample period:60us
const uint8_t OVERSMPL[5]={0xf1,0x07,0x7b,0x13,0xe0};//oversampling rate 12.6us
const uint8_t NCHAN[5]={0xf1,0x0d,0x10,0x54,0xaf}; //16 cells
const uint8_t CHANNELS[8]={0xf4,0x03,0xff,0xff,0xff,0x00,0x10,0xa0};//all cell and AUX and both internal tempe channels

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BQ40Z60: BQ40z60 DSG FET is not turning on, voltage present in idle state on HIDRV pin

April 7, 2019, 5:51 am
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Part Number:BQ40Z60

Hello All,
I'm designing custom board with BQ40Z60 and have issue witch DSG FET. When I press change state of this FET, after few ms it is switching off, coil L3 is making noise.
Here is voltage output of DSG gate:

What I am also seeing is, on the VSYS path is always voltage ~2.8V. It is occurring because HIDRV output is constantly providing voltage ~2.8V. When I'm trying to change state of DSG FET here is what is going on on HIDRV output:

May it be the issue why I can not turn on DSG FET? If so, why it is always voltage on HIDRV pin?

.

(Please visit the site to view this file)

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LMZM23600: step up and step down in one component

April 7, 2019, 6:40 am
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Part Number:LMZM23600

Hi

i have a system that the input voltage can be between 20-2V and I need to convert it to 2-6V.

the thing is that sometime the input is 2V and I need to convert it to 6V and sometimes the input is 20V and i need to convert it to 2V so the ranges are pretty big.

I need a component that can be a step up when needed and also a step down when needed and the output voltage should be adjustable between 2-6V.

is there such a component?

thanks in advanced.    

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BQ51050B: Reference Design EN2 Pin confusion

April 7, 2019, 1:10 pm
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Part Number:BQ51050B

Dear Support

I am planning to use BQ51050B as wireless receiver ONLY (Not wall adaptor)

For EN2 pin (in pinouts description) The Data sheet says that:

Used to set priority between wireless power and wired power. EN2 lowenables wired charging
source if AD input voltage is present. EN2 highdisables wired charging source and wireless power
is enabled if present.

But then on reference schematic (TIDA00669), it shows EN2 pins is pulled LOW where as its AD pins is also connected to 0V.

Looking at the reference schematic, it seems like it is designed to work as WIRELESSonly and NOT the Mains Adaptor compatible. Then Why is EN2 pin connected to LOW (0V)?

If it needs to be connected to HIGH then which pin / voltage?

Kind Regards

NS

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UC3854B: Gate output oscillation

April 7, 2019, 5:01 pm
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Part Number:UC3854B

Hi TI,

Could you help to review the schematic as attachment?

Actually, we have a issue with the oscillation of gate output.

Some ICs on the same board have this oscillation and others do not have this problem.

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TPS65175: Cgh

April 7, 2019, 10:48 am
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TPS65131-Q1: Pin to pin short test&pin to ground short test

April 7, 2019, 6:37 pm
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Part Number:TPS65131-Q1

Hi Sir,

Does TI have pin to pin short test report and pin to ground short test report?

Best regards,

Vito

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download bq Evaluation Software (bqEVSW) v0.0.92

April 7, 2019, 6:47 pm
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I want to download bq Evaluation Software (bqEVSW) v0.0.92.
The interface with the PC is EV2300.  

Please tell me the link destination. 

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BQ25895: Will the device reset when Vbus falls below VBUS_UVLOZ and then rises above VBUS_UVLOZ when the battery is 4.2V and connected to VBAT?

April 7, 2019, 6:52 pm
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Part Number:BQ25895

Hi, I have two questions for this device:

1. Will the device reset when Vbus falls below VBUS_UVLOZ and then rises above VBUS_UVLOZ when the battery is 4.2V and always connected to VBAT?

2. For relative VINDPM, when VINDPM_OS is 600mV default value, I plug in a 6V adaptor, the VINDPM will be (6-0.6)=5.4V, correct?

If VBAT connected to a 4.2V battery, and I unplug the 6V adaptor and plug in a 5V adaptor, VINDPM will still be 5.4V or it will be updated to (5-0.6)= 4.4V automatically?

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BQ78Z100: BQ78Z100 HDQ communication problems

April 7, 2019, 6:57 pm
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Part Number:BQ78Z100

Hi Team,

Now configured BQ78Z100 has the following problems:

BQ78Z100 communication is normal in I2C mode.
configure parameters----click to convert from I2C to HDQ----connect the communication line to the HDQ end of EV2400. When PCB is re-powered on and the software BQ STUDIO is rebooted, IC cannot be found. May I know what is the reason?

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BQ78350: In BQ78350, the current is scaled 10:1, does it have an effect when conducting CEDV?

April 7, 2019, 7:03 pm
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Part Number:BQ78350

Hi Team,

Since the battery capacity is about 130AH, current and capacity are scaled to carry out discharge tests at high and low temperature! In this way, does it have an impact on the test results?

If so, how to deal with it? Will such discharge tests affect the matching of chemical IDS?

Thank you!

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LM46001-Q1: what is the differences between LM46001QPWPRQ1 and LM46001AQPWPRQ1?

April 7, 2019, 7:13 pm
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Part Number:LM46001-Q1

what is the differences between  LM46001QPWPRQ1 and   LM46001AQPWPRQ1? LM46001QPWPRQ1 has been in NRND status. 

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UCD3138064 Programming Error

April 7, 2019, 8:09 pm
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Hi,

I am having problem in downloading the complied code of Training Lab 1.0 in my UCD3138OL64EVM-031 RevA Evaluation board. This this the error message "Error: The firmware selected with device id: UCD310064V1 is not compatible with the IC: UCD3100.  Please select another firmware file."

I am using CCS8 compiler 5.2.4 and Fusion Gui version 3.0.34

Since I am using a 64 pin version of UCD3138, i selected UCD3138064 in build configuration.

Thanks.

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TPS51285A: cannot get into DEM

April 7, 2019, 8:21 pm
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Part Number:TPS51285A

Hi expert,

Customer has a question on CCM --> DEM. Below is the waveform that TPS51285A cannot get into DEM mode, we think it is due to wide ZCD threshold.(inductor current is down to -15.6A but it is still in CCM) Would you kindly help to check if it is normal operation for TPS51285A? Thanks a lot!!

Best regards,

Ann Lien

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LM5161: LM34940 inductance gear whine

April 7, 2019, 8:23 pm
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Part Number:LM5161

hi TI,

Remark, I can't fill LM34940 part number in above part number, so use LM34940 to replace.

I Have one customer used LM34940, which they find their output inductance have gear whine, and this schematic as below.

and they have used two brand inductance, one is MAPM0630F, another is KMPH0630, and KMPH0630's gear whine is lighter than MAPM0630F.

could you help to improve it? and could you tell us, what's reason will lead to this gear whine, thanks.

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TL431A-Q1: re there any differences between the following screenshots? T3AG/TAIS/TAI3/TAIU

April 7, 2019, 8:33 pm
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Part Number:TL431A-Q1

Query shows that TL431AIDBZR and TL431AIDBZRG4 have the same TI marking.

Are there any differences between the following screenshots? T3AG/TAIS/TAI3/TAIU

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TPS54335A: TPS54335A Question, UVLO measurement different from the calculation result.

April 7, 2019, 8:42 pm
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Part Number:TPS54335A

Dear support member,

My customer used TPS54335A.
I have a question about UVLO.

（Situation)
R1(VIN - ENpin)：430kΩ
R2(EN pin -GND)：33kΩ

Calculated of Datasheet
Vsart：17.3V
Vstop：13.5V

Measurement result
Vsart：17.3V
Vstop：12.5V


（Question）
When the input voltage is 12.5 V, the output voltage is turned off.
It is different from the calculation result. (Vstop: 13.5 V)
What is the cause?


Best regard.
Bob Lee.

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TLV62585: Thermal Information

April 7, 2019, 9:07 pm
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Part Number:TLV62585

LPDC support team

Why does the thermal information between datasheet and Webench different?

The below is the thermal information in datasheet

The below is the thermal information in Webench.

Thanks

Tamio

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