Quantcast
Viewing all 262198 articles
Browse latest View live
↧

UCC28070: GDA and GDB PWM duty cycle is not stable with fixed resistive load

September 12, 2018, 2:59 am
$
0
0

Part Number:UCC28070

Hi John,

My PFC prototype using UCC28070 is alive in the sense that it regulates the loaded output to the desired +90V voltage. The DC output signal has a ripple of about 1 Vpp and the ripple has the shape of a 100Hz sinewave. However, there are spikes of a few voltage in amplitude appearing on the output signal. These spikes appear periodically every second or so, which means that the output signal varies from perfectly clean to very noisy. See various pictures in attachment showing the noiseless or noisy output.

I measured the GDA and GDB chip outputs and I can see that the duty cycle of the PWM is not stable. With a 12 Ohms load (90V across it), the two GDx signals vary from about 50% duty cycle to about 30% duty cycle on both GDx outputs. See video in attachment. The variation seems cyclic too and I would say it has a similar period as the spikes appearing and disappearing on the output.

Is this the sign of an instability of the compensation around UCC28070?

besides, the measured VINAC signal has not got the perfect shape of a rectified signal. Every other one cycle, the voltage doesn't go back to zero but stays at about 0.6-0.7V before going back up. See icture in attachment. Could the chip prevent the signal from going back to zero? See picture in attachment.

FYI, the circuit diagram is almost identical to the one used in your eval board, expect that it was designed to deliver 1000W using the Excel design tool that you provide to work out the values of the components around the chip. There is a mains transformer in front of the PFC module dropping the voltage to 48V AC. The output filtering capacitor is much larger than what was recommended in the spreadhseet (recommended 6mF, fitted 47mF). See spreadsheet in attachment.

Thanks i advance for your assistance.

Best regards,

Raphael

↧
Search

DS90C031QML: Unused input and output pins

September 12, 2018, 3:00 am
$
0
0

Part Number:DS90C031QML

Hi,

I am using only one of the four channels of this device.

What should be done for the unused input and output pins for the other channels?

Thanks in advance.

↧
↧

INA240: ina240

September 12, 2018, 3:09 am
$
0
0

Part Number:INA240

Hello Team,

In the INA240 product folder there is a error calculation tool which is useful!

But I would like to have current range from 0.1A to 130A and the tool only supports up to 100A.

My system specs are shown below:

1. Rshunt: 0.1m-ohm

2. Load current: 0.1A to 130A

3. Operating temperature 60 degree C

4. High side sensing 12V Vbus

Could you share INA240A4 error calculation excel file with me so that I can change the load current to 130A and check the error%?Image may be NSFW.
Clik here to view.

Thank you.

Regards,

Lynn

↧

CC1312R: How to test 4-GFSK of CC1312R

September 12, 2018, 3:11 am
$
0
0

Part Number:CC1312R

Hi All,

The CC1312R data sheet shows that it supports 4-(G)FSK modulation. Is there a 4-(G)FSK example or SmartRF studio settings for testing ?

The radio setup requirements are as follows:

Frequency: 868 MHz

Modulation: 4-(G)FSK

Datarate: 200Kbps (symbol rate 100Kbps)

BR,

Jack

↧

Linux/TDA2: How to check availability of opencv lib/module in VSDK (Linux)?

September 12, 2018, 3:14 am
$
0
0

Part Number:TDA2

Tool/software: Linux

Dear TI:

There are list of pre-build OpenCV libs in VSDK3.4 folder:

PROCESSOR_SDK_VISION_03_04_00_00\ti_components\open_compute\opencv\opencv-3.1.0\libs_linux:

libopencv_calib3d.a

libopencv_objdetect.a

..

I enable the opencx and build and run the OpenCV use case successfully under Linux, but I can't find any libopencv* (listed above) in targetfs. How to check which module is available inside the VSDK? ( I am trying to use openCV object detection API but failed and wonder if there is opencv objdetect lib available in VSDK Linux)?

Thanks and best regards

He Wei

↧
↧

TM4C1290NCPDT: Modification of RTS on enabled UART

September 12, 2018, 3:14 am
$
0
0

Part Number:TM4C1290NCPDT

Hello,

the datasheet Rev. B states in section 16.6 (UART/Register description):

Image may be NSFW.
Clik here to view.

Does this include the RTS bit (#11)

Image may be NSFW.
Clik here to view.

too?  E.g. have I to disable the UART before I can change RTS, or is this allowed while UART is running?  (RTSEN is off).

↧

RTOS/LAUNCHXL-CC1352P: cc1352P1 launchpad BLE module power consumption problem

September 12, 2018, 3:14 am
$
0
0

Part Number:LAUNCHXL-CC1352P

Tool/software: TI-RTOS

Hi，team.

I am using the cc1352P1launchpad and found currents up to 80uA when using the BLE module.

The broadcast interval is 1000ms, and the transmit power is the default value.

Use the development software CCS8.1.0, the routine project zero.

Is this the design power consumption, or is there anything that is not set?

Ps: Using the routine pinstandby, the current can be reduced to 0.1uA.

Thanks！

↧

TPS2549-Q1: for Type-C application

September 12, 2018, 3:15 am
$
0
0

Part Number:TPS2549-Q1

Hi Sir,

I want have cable compensation like TPS2549-Q1, but I will use at type-C application (up to 9V). TPS2549-Q1 operating range only up to 6.5V.

Has any device could achieve this function?

PS: this is for automotive application

thanks~

Regards,

Driscoll

↧
Search

TLV62568: The both sides of pins have packaging materials.

September 12, 2018, 3:18 am
$
0
0

Part Number:TLV62568

Dear  All

       Look at the below picture, the both sides of pins have  packaging materials. Is it normal ? Does the packaging process require removal of these packaging materials ? Because it will stop to sold the both sides of pin .

     

↧
↧

TSC2003: TSC2003 touch problem

September 12, 2018, 3:19 am
$
0
0

Part Number:TSC2003

There is a problem with the use of TSC2003. When you click on the screen, the ad values read out when you touch and leave the screen jump, but the long press is a relatively stable and correct coordinate position. Please help analyze the reasons for this problem.

↧

TPS25740A: operating temperature

September 12, 2018, 3:21 am
$
0
0

Part Number:TPS25740A

Hi Sir,

Could you proved the operating temperature for TPS25740A? I only find operating "junction" temperature range (-40~125 degC) in detasheet and can't find operating temperature.

I'll use at automotive application (-40~95degC). Do you has any suggestion?

thanks~

Image may be NSFW.
Clik here to view.  

Regards,

Driscoll

↧

CC2642R: Stable 32Khz derived from 48Mhz: Is SET_CCFG_MODE_CONF_SCLK_LF_OPTION=0x00 still an option

September 12, 2018, 3:21 am
$
0
0

Part Number:CC2642R

Hello champions ,

I'm wondering if is it still possible to derive a stable 32Khz from the 48Mhz crystal on the CC2642  thanks to the  define : SET_CCFG_MODE_CONF_SCLK_LF_OPTION    =  0x00 ;

This option is available on CC2640 that needs a 24Mhz crystal.

Target is to have a Multirole BLE device with the 48Mhz crystal only .

Thank you,

Paolo         

↧

RTOS/MSP432P4111: How can I use I2C_Transfer() to communicate with HDC2080 on Read Multi Byte way?

September 12, 2018, 3:21 am
$
0
0

Part Number:MSP432P4111

Tool/software: TI-RTOS

Hi, 

How can I use I2C_Transfer() to communicate with HDC2080 on Read Multi Byte way?

Can you give me some advice about this? S + SA(R) + reg + S + SA(R) 

Image may be NSFW.
Clik here to view.

As we know, the I2C CODE is

    txBuffer[0] = regAddr;
    i2cTransaction.slaveAddress = HDC2080_I2C_ADDRESS;
    i2cTransaction.writeBuf = txBuffer;
    i2cTransaction.writeCount = 1;
    i2cTransaction.readBuf = NULL;
    i2cTransaction.readCount = 0;
    I2C_transfer(handle, &i2cTransaction);


    i2cTransaction.slaveAddress = HDC2080_I2C_ADDRESS;
    i2cTransaction.writeBuf = NULL;
    i2cTransaction.writeCount = 0;
    i2cTransaction.readBuf = rxBuffer;
    i2cTransaction.readCount = rlen;

Image may be NSFW.
Clik here to view.

It is not the sequence as the device requires.

Thanks for listening, I hope someone can give me some advice.

↧
↧

CCS/IWR1642: Running capture_demo.m to import data from IWR1443BOOST/IWR1642BOOST

September 12, 2018, 3:22 am
$
0
0

Part Number:IWR1642

Tool/software: Code Composer Studio

Hi,

I am running the capture_demo.m file to read ".dat" file recorded from the mmwave demo visualizer, but I think the code needs to be modified somehow. I am getting the error below:

Error using cat
Dimensions of matrices being concatenated are not consistent.

Error in cell2mat (line 83)
m{n} = cat(1,c{:,n});

Error in capture_demo (line 95)
data = cell2mat(cat(2, rawData{:}));

An help would be really appreciated. Thanks.

Regards,

Sheeraz

↧

LM48100Q-Q1: Output short detection vs 4ohm load capability

September 12, 2018, 3:23 am
$
0
0

Part Number:LM48100Q-Q1

Hi,

I have started to evaluate the LM48100Q-Q1 and am a bit confused by the output load driving capabilities. 

I can see data in the datasheet for 4ohm loads in section 6.11, however the output short fault detection is noted as between 2-6ohms. These pieces of information seem to contradict each other. My aim is to drive a 4ohm load, but will this not be possible due to the output short detection? 

Regards,

Jason

↧
Search

TLV62568: The both sides of pins have packaging materials.

September 12, 2018, 3:24 am
$
0
0

Part Number:TLV62568

Dear  All

       Look at the below picture, the both sides of pins have  packaging materials. Is it normal ? Does the packaging process require removal of these packaging materials ? Because it will stop to sold the both sides of pin .

       Image may be NSFW.
Clik here to view.

       And the second below picture, the bottom of pins tin plated which are not smooth, the reflection brightness is inconsistentis, is it normal ? why?

Image may be NSFW.
Clik here to view.

     

↧

Compiler/CC3200: CC3200 OTA Fails on a particular network

September 12, 2018, 3:29 am
$
0
0

Part Number:CC3200

Tool/software: TI C/C++ Compiler

Hi I am facing a stange problem.. the OTA works fine on every network expect university network ..We have deployed 100s of devices which are using cc3200 and SDK 1.3.0. The OTA is failing since yesterday only.

I have tried following :

1. Change cdn_url[512]; // it was already there

2. MAX_EAGAIN_RETRIES 10 changed to MAX_EAGAIN_RETRIES 30 ( no success )

I have looked deeper then found  

sl_recv( ) returns error -11 inside funtion "CdnClient_ConnectByUrl"

one more thing if we try using our mobile hotspot then everything works fine and network socket id happens to be 86. Whereas on university network socked id is 85. I don't know why this is happening. Please help me out in this.

↧
↧

CC3100MOD: Simplelink Driver Configuration

September 12, 2018, 3:33 am
$
0
0

Part Number:CC3100MOD

Hi

1.) Question

I need to disable incoming ping responses, so when my device is getting a ping request, it should ignore it

2.) Question

I need to be able to ping a device, so when im connected to a AP, i need to ping a certain IP address to see if it is alive. How can i do this?

3.) Question

In the picture (see link below) you see, that the wifi module sends out a lot of MDNS messages (broadcasts). I need to disable those broadcasts. How can i do this?

4.) Question

I have an issue with the device: When i power up, connect to ap, open a udp socket, transmit data, close socket,.. and then open socket, transmit, close and all over again. no issue. Although, when i power up, connect to ap, open udp socket, transmit, close, DISCONNECT, wait, CONNECT, open socket ... etc.. the device no longer transmitts its data..

Do you have an input what could be the cause of this? It still sends out 3x MDNS packages, but not my message...

Image Link: ibb.co/bGjws9

https://ibb.co/bGjws9

↧

Linux: AM335x LVDS interface

September 12, 2018, 3:31 am
$
0
0

Tool/software: Linux

HI ,

I am trying to interface lvds display on am335x som and kernel version is 4.4 but by default lvds support is not there in 4.4 kernel for am335x please help me to do  lvds interface in devicetree.

Thanks & Regards,

   Prasanth

↧

RTOS/CC2650STK: CC2650F128

September 12, 2018, 3:35 am
$
0
0

Part Number:CC2650STK

Tool/software: TI-RTOS

Hi,

I imported the uart echo(example program) program to CCS IDE. .I have sensortag and jlink. i Loaded the program but i'm not getting any display on Putty. Could u suggest something here ?

↧
Viewing all 262198 articles
Browse latest View live
Search
<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>