Part Number:UCC28951-Q1
Hi all,
I am trying to find the transformer turn ratio (section 8.2.2.2, page 37). In this example, (Max Duty cycle) Dmax is 70%, but the specification of controller (page 5) shows Dmax as 95% at Fsw=100kHz.
Does the Dmax changes according to the application (like the one in the above example)? If yes, how to calculate that?
Part Number:UCC28600
We are designing an SMPS (36V/8A) using UCC28600D. We used Webench design tool for the reference circuit. The input given is 220V AC. The problem we are facing is that the output voltage is fluctuating between 9V - 36V. The input voltage given to the IC UCC28600D is also varying from 9V-12V and hence the output pin of UCC28600D is giving a burst of 128Khz pulse. I am attaching the schematic and the waveform of the voltage at VCC pin of UCC28600. What would be the reason for the voltage fluctuation?
Part Number:BQ76930
Dears,
I try to click the button of "Clear Fault", but the result is invalid.
Please give some advice, thanks a lot.
Part Number:UCC28600
I have used the reference schematic design given on TI Webench using controller UCC28600D for SMPS (36V/8A) and attached the same as refereddesign.pdf and I am also attaching the schematic I have used for my design with little modifications as smps.jpg.
PROBLEM: Input voltage at VCC pin of UCC28600D is fluctuating from 9V-12V but if I remove the IC then the voltage is constant at 12V and even if I remove the mosfet (U2) the input voltage at VCC pin of the IC continuously fluctuates.
The output voltage after T1 measuring across R7 is also fluctuating from 10V-36V.
I am attaching the waveform of the voltage at VCC pin of UCC28600D.
The input given to the SMPS is 220V AC.
What could be the reason for the fluctuations?(Please visit the site to view this file)
Part Number:BQ76940
hey , I am doing testing of 15 cells with BQ76940 .
When cell voltage goes above Over voltage Threshold , the BQ76940 gives over voltage fault and voltage at CHG pin is Zero.
The problems are :
1. Sometime for some moment the value at DSG pin also falls to zero, why? it should not be.
2. And when the cell voltage falls below Under Voltage Threshold , it continues to discharge since the IC fails to give Under Voltage Fault.
Part Number:BQ40Z50-R1
Hi TI experts,
Do you have BQKEYPACKAGER and BQKEYPROGRAMMER User Guide? It's like EVM user guide to teach you how to operate tool step by step.
Part Number:TPS7A33
I have similar questions related to this post "TPS7A33: Which negative to negative buck as pre-regulator". We have an industry power source that is the power input to our PCB, which is +24V, GND, -24V. We want to generate positive and negative (clean, low noise, high PSRR) powers of +15V, GND, -15V, using TPS7A33 and TPS7A47. A DCDC pre-regulator is needed for optimum thermal designs using LDO. We have chosen an appropriate power module, lmz14201h, for converting +24V downto +16V. And now I want to find the best DCDC that can be used to convert -24V to -16V. Note that, we do not need to generate -16V from +24V. Is there any power module or design notes from TI that can be used to down-convert -24V to -16V? Thanks in advance, and we are looking forward to your replies.Part Number:BQ40Z50-R1
Hi,
I'd like to implement soft switch (not hardware switch) with BQ40Z50 without external FET just to control power.
One idea might be using Emergency Shutdown feature, but I'd like to hear better way or my way is right or not.
1. Simple toggle switch
- Press : Turn on the battery pack
- Press when the battery is turned on : Turn off battery pack.
Part Number:BQ2057W
Can someone explain to me why I cannot turn the input voltage above 10.2V to charge my 8.4V batteries? I am using high side sensing (100 mOhms) with a P-FET. My input current is 1.4A and output is charging at about 1A (see Figure 4 in the datasheet for configuration)....I do not have an NTC connection or D1. There seems to be a small operating voltage window on the front end of this (8.5V to 10.2V). If I go above 10.2V the battery stops drawing current.....What is shutting it down?
If I reduce the high side sensing to 50 mOhms...I get the same result only now I am drawing about 2.6A from the input. But voltage is still bounded
Please explain
Thanks
Steve
Part Number:BQ76930
Hi
I'm a software engineer who likes playing with hardware. Pretty much everything I know about electronics is self-taught, and making lots of mistakes. One of my current projects is to build a set of LiFePO4 batteries and to date I have assembled the cells, together with a Battery Management System that controls the charge/discharge rates, as well as balancing the cells. I am now building a Battery Monitoring System that at a minimum will include a coulomb counter and information on individual cell voltages. Following a request for advice on the allaboutcircuits forum, a member replied and told me about the BQ76930 device. Since then I have attempted to read through the specifications and due to my lack of expertise, I still have a few questions left unanswered. I thought this forum would be the best option for getting device specific information...let's hope so!
My battery details...
8s8p configuration using 38120 LiFePO4 cells. There are 3 of these 24V batteries in parallel.
Battery charge/discharge management and cell balancing has already been implemented.
I also have implemented an 'overall' battery level (coulomb counting) circuit that monitors the total flow in/out of the 3 parallel batteries, but depending on complexity involved, I may decide to use the BQ76930 onboard coulomb counter so that each battery can be measured individually - particularly useful if I decide to split the configuration differently.
I will be feeding battery information (via a PIC MCU) to a graphical touch screen (Nextion), so will expect to be able to interrogate each battery pack (and hence, each bq76930) individually from the control MCU.
Having said all that, these are the questions I still have regarding the BQ76930.
From what I've read in the specification document, this seems like a really powerful monitoring chip and should be very capable of carrying out the limited functions I require. What is tripping me up is the amount of detail in the documentation that I am not able to comprehend. Any help with simplifying this or explaining what are/are not essential in my implementation is appreciated.
Thanks.
Part Number:BQ4050
I'm using a 4S configuration. Is there a way to set the Under Voltage protection threshold with reference to the entire pack voltage and not each individual cell? As in, instead of setting 3V threshold per cell, I could set 12V per the entire pack?
Part Number:TPS53647
Tool/software: WEBENCH® Design Tools
A design use the tps53647 to output 3.3V @ 100A.
The schematic is designed by the webench except the Output Voltage Scaling resistor.
I use 16pcs 2.5ohm Cement Resistors as the load.
(Please visit the site to view this file)
when I power up the tps53647 board, the output doesn't work .
It seems like the 3v3 output is over current protected( the up pic.)
I remove the Output Voltage Scaling resistors. The output is 1.66V.
I remove all the Cement Resistors, add the Output Voltage Scaling resistors, the output is 2.8V.
How to use the Voltage Scaling resistors to output 3.3V with tps53647. Could you Review the Sch? Thanks!
Part Number:SM74611
Hi there,
We used the SM74611 diode for our voltage regulation application for single board computer. It needs 3.3V and 2 ampers for operation. Single board computer couldn't start because of the voltage switching. I added the scope image for voltage in.
In the datasheet lowest voltage is 1V, so I think it should work fine with 3.3V.
Thanks!
Part Number:LP5569
Hi all,
We plan to use LP5569 in our new product.
Our application has the following LED outputs
LED1 - Connected to a RGB LED_A (G1)
LED2 - Connected to a RGB LED_A (B1)
LED3 - Connected to a RGB LED_B (G2)
LED4 - Connected to a RGB LED_B (B2)
LED5 - Connected to a RGB LED_C (G3)
LED6 - Connected to a RGB LED_C (B3)
LED7 - Connected to a RGB LED_C (R1)
LED8 - Connected to a RGB LED_C (R2)
LED9 - Connected to a RGB LED_C (R3)
We want to use LP5569's engine to create an infinite breathing effect for each LED as below.
LED_A = Oragne RGB=(255,150,0)
LED_B = Violet RGB=(150, 0, 255)
LED_C= Rose RGB=(255,0, 100)
Is it possible?
If it is, What is the code to do that?
Thanks for your help
Part Number:TPS92641
Hi,
I'm designing some boards using TPS92641 to drive LED arrays (~40Vf and ~2A). There is one installation in particular where it would be considerably easier if the boards are installed far away from the LED arrays (circa 15m~20m away).
In this application, SDIM is preferred due to the nice control during low duty cycle PWM. (Not only in one LED array but also amongst LED arrays when they slowly turn on)
Besides the resistive losses and voltage drop on the cable, are there other issues that I have to take into consideration? My main worry is that the extra parasitic inductance in the cable would pose a problem or instability. I'm not entirely sure if EMI is an issue right now because this is a one-off project that will not be commercialized. I understand that the shunt FET wont be able to shunt the current on the parasitic inductance of the cable but I think this side effect will be tolerable.
I can adjust the Switching Frequency, PWM frequency and the inductor value if there is a range that is more suitable for this (and other modifications to the circuit as well).
Thanks in advance
Part Number:TL1963A-Q1
Hello.
My customer requested to share the CTE information of ICs below.
CTE(Coefficient of Thermal Expansion) of TL1963ADCQR(Lead Frame).
CTE(Coefficient of Thermal Expansion) of TPS7A6033QKVURQ1(Lead Frame).
Could you share the CTE values of ICs above to me, or please let me know how to figure out the information.