Part Number: UCD3138A64
Hi
We are evaluate a new battery charger project using 4 switch buck-boost converter,we're taking a digital controller due to the SMBus requirement .
the PMP21529 solution is just right for us ,but I cant find its source code from TI .
Anyone has the source code ,please send me a copy to mail: ipc58@aspower-cn.com.
Thanks A lot
Part Number: LM25085
Tool/software: WEBENCH® Design Tools
I have designed a regulator which provides 12V @ 3A with an input of 12.5V to 24V. When I calculate the values for the minimum ripple configuration using the LM25085 data sheet description (8.2.2.6 R3, C1, C2) or the LM(2)5085 Quick Start spreadsheet I get R3=12.7k, C1=3300pf and C2=0.1uF . This results in terrible Line regulation, with the output varying from 11.7V to 12.7V as the input voltage is changed from 13V to 24V.
When I used WEBENCH it configured those components differently, with R3=29.4k, C1 = 18nF, and C2 = 1.8nF. These values gave much better results with the simulated output varying from 11.96V to 12.14V as the input was varied from 13V to 24V. Is there any application note, spreadsheet or other guideline for selecting these components in the way that WEBENCH chose them, rather than the approach described in the data sheet? It seems that having a small value for C2, rather than an arbitrary large value like 0.1uF, is very important, but I'd like to know how to optimize the values to match my circuit.
Part Number: LM5022
Dear Sir, (Please visit the site to view this file)
There is a TI reference design, PMP20497 made by LM5022. I have a question here. I calculated the current passing throguh photo diode (U2), and got 103.4mA [=(54-1.17-1.24)/499], 1.17V is forward voltage of photo diode of U2, 1.24V is the minimum voltage (Vcathod-anode) of U3.
By multipling CTR (=200%~400%) of U2, then getting the current sourcing from U1 pin 3 is 206.8mA~413.6mA. I checked LM5022 datasheet, the maximum souring capability of LM5022 pin 3 is 1.5mA, according above calculation, actually demanding current (206.8mA~413.6mA) is far above 1.5mA, why? Do I make any misunderstanding?
Part Number: LM74700-Q1
Hi team,
If LM74700 used for battery input reverse protection , what phenomenon during " ISO16750-2 4.4 Superimposed alternating voltage "
test ? Does LM74700 turn off external MOSFET due to reverse current is triggered ? please share the waveform if you did this test ever.
thanks~
Part Number: UCC28220-Q1
Hello there,
I am working on interleaved boost converter using UCC28220-Q1. Line and load regulation is as required, but as I increase load, one of the inductor is carrying substantially more current than the other inductor. I checked the corresponding pwm waveforms of controller and gate driver output. Both waveform have equal duty cycle at respective load. Where could be the problem?
Thanks and regards,
Akshay
Part Number: LM5009A
Hi support team.
Please let me know how the output voltage behaves after the current limit occurred.
Regards,
Dice-K
Hi,
would you please help to recommend a solution : 24V DC in and + -12V, 100mA solution. also need to support short circuit protection。
Fewer devices are better。 thanks.
Part Number: REF2930
REF2930AIDBZ- need Process technology size? is this part tested for Single Event Latchup (SEL). is so, the test data is available?
Part Number: LMR16030
Hi team,
My customer uses the LMR16030 as a 12V input, 3.9V/2.6A power supply.
Now he finds when using wound metal inductor(AMRU00060630100MA1) the IC and the inductor will both heat badly, but change to normal wire wound inductor(SLF12575) there will be no thermal issue. The inductor current is tested and they are basically the same. The test waveform is attached below, and the datasheet of both inductor are also attached.
Can you help me analyze the reason why the wound metal inductor can cause the IC thermal issue? The inductor value is the same to 10uH.
Thank you
Normal wire wound inductor current waveform(SLF12575), no thermal issue:
Image may be NSFW.
Clik here to view.
Wound metal inductor current waveform(AMRU00060630100MA1):
Image may be NSFW.
Clik here to view.
(Please visit the site to view this file)
(Please visit the site to view this file)
Part Number: USB-TO-GPIO
The adapter broke down after working normally for several days.I am having trouble connecting USB-TO-GPIO to PC. The green light on the adapter is off, however, the GUI says adapter not attached. Also, the device manager displays an 'unknown device'.With in a few computers, are all the same problem.Could anyone provide a solution for this issue?Heartfelt thanks!
부품 번호 : LMG5200EVM-02
Image may be NSFW.
Clik here to view.
I ran two lmg5200-2 evm boards in the same environment and one board does not work. It was operated in the same environment and there were no strange symptoms such as smoke or noise, but one board showed the desired output, but one board only took about 1 ~ 2 Volt of voltage but no current flowed and switching was not performed. My suspicion is a bad board, and I want to replace it with another new one.
Part Number: TPS56221
Hi team,
My customer meet some issue on power off, SCH is below:
Image may be NSFW.
Clik here to view.
And below is the power off wave of TPS56221:
Image may be NSFW.
Clik here to view.
Input voltage is 12V, output is 3.3V, load current is 6A, when input power drop to 6.3V, TPS56221 input voltage has a big drop.
But when customer use 6V supply TPS56221, set output to 3.3V@6A load, TPS56221 works good.
We don`t know why this strange drop happened when input drop to 6.3V, do you have some comments?
Thanks very much.
Regards, Sunny
Part Number: LM3424-Q1
I AM USING DRIVER IN BUCK MODE WITH INPUT VOLTAGE 24V. IN OUTPUT I AM USING LED ARRAY (3 ROWS WITH EACH ROW HAVING 5 LEDS). AS SOON AS I SWITCHED ON POWER SUPPLY, LED ARRAY ALSO GET 6V WHICH CAUSES IT TO BE IN ON STATE (THOUGH VERY SMALL BRIGHTNESS). AND I HAVE NOT GIVEN ANY SIGNAL TO ENABLE PIN OF THE DRIVER. I AM USING BUCK CIRCUIT GIVEN IN DATA SHEET AS EXAMPLE.ITS MY REQUIREMENT THAT LED ARRAY MUST STAY OFF UNTIL UNLESS ENABLE SIGNAL IS PROVIDE.
ALSO IN BUCK CIRCUIT EXAMPLE L1 IS USED TWICE. IS IT REQUIRED OR IT’S A PRINTING MISTAKE.
KINDLY HELP ME
Part Number: LM27762
Hi, all!
I need to read the output of a photodiode through TI Hercules RM57Lx, with the onboard ADC. The photodiode gives a negative voltage, so I have made an inverter circuit using TL072 IC.
The issue is that TL072 IC needs a negative power supply as well. I was using two 9V batteries to provide the +ve and -ve voltages but I need a constant power source. Is LM27762 IC a reliable option?
If not, please, suggest.
Thanks and regards,
Apurv
Part Number: LM25180
Hi, Team
this is MASA.
could you see below ?
Q1. should customer consider how much Cout is ?
-> i do think so regarding ripple at output. correct?
Q2.is there equation to select how much its value is appropriate?
Q3.
is there any way to do something around the IC with external component if loop compensation inside IC were not good enough.
Q4.
How IC compensates loop internally ?
is there any apps note or any image to know how those work?
Part Number: UCC28950
I'm working on a PSFB converter design.
Calculate magnetic inductance for PSFB. Formula (30) have a (1-D) in UCC28950 datasheet. Formula (30) ： Lmag≥（Vin*(1-D)）/{(ΔI*0.5/a1)*2*Fsw}
I think that Out inductor current downslope happens during the Toff, when the transformer voltage is 0 volt. The formula should replace (1-D) with (D)?
I have seen the related answer https://e2e.ti.com/support/power-management/f/196/t/783125
I would like help.
Thanks
Part Number: BQ40Z50-R2
Hi
We want to use BQ40Z50r2 for new battery pack.
And we want to use LED Indicator Status for SOC level.
We have very simple question
LED blight time setting by LED Support Resister "Hold time " between 10 to 64 setting value.
[ Question ]
Can we keep LED bright without Hold time setting after ”Disp SW ” ??
* This mean . We want to keep LED indicator Status blight continue while Charge and Dis Charge.
Is it possible ?? or if you have other way please tell us .
Regard
March Jasper ( Japan Disty Sugimoto )
Part Number: TLV758P
Hi team,
I'd like to ask Vout accurancy of TLV75801PDRVR.
I'm introducing TLV75801PDRVR for customer.
I know this device doesn't have fixed output.
Vout is 1.5v. (required in 1.4v~1.65v.)
Do you have any solution for this accuracy?
Best regards,
Kento
Part Number: UCD3138
Tool/software: Code Composer Studio
As the picture below shows ，what‘s the fault units of the ’frequency 100‘ ？
Hz or KHz？
Part Number: BQ24610
Hello everyone
I designed a new charger PCB for my 6S lipo battery pack. I used BQ24610 as charger. I used the exact same schematic from datasheet. Every component is the same with its suggested ones.
But whenever i hot plug the battery to circuit, BQ24610 and low side MOSFET gets burned in a very awful way. I searched the forum and couple of people also faced with this problem but there is no solution in the forum.
Since this is a battery application, this is a very unsafe circuit to use in project. I had three circuits and all got burned. I could not scope the PH, BTST, REGN and other pins. I am waiting new chips to arrive.
Is this a known issue? How can i fix this problem?
