Forum Post: Vision machine lighting; constant current regulator or led driver?
Hello,First, my apologies if I'm not writing in the right forum but I'm a bit lost with this issue.I'm trying to design a lamp for a vision machine application. It consists on 9 ultra bright leds. The...
View ArticleForum Post: RE: USB Charging Detectors TPS2540, TPS2541, TPS2543, TPS2511
Thanks Eric.If the application is for a stand alone USB charger (DCP auto), will the TPS2511 provide that same level of compatibility to mobile devices as the TPS2546?I would appreciate a compatibility...
View ArticleForum Post: RE: Controller Selection
Hi Anthony,Well we are thinking of using the LMR64010 instead of the LMR62421 because the SW node can go up to 40V in the LM64010. We are also thinking of buffering and amplifying our input voltage to...
View ArticleForum Post: RE: Maximum absolute rating of Ramp pin for LM25119
HiThank you for quick response. We will suggest this care to our customer .Many thanks,
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Forum Post: RE: TPS27081A Output Votage
Hello,On my design, there is an I/O connected to this switch. I tried to disconnect the load, but there is no change.Here is a snapshot of the TPS27081A output where;C1 = 0.1uFR1 = 10KR2 = 1K Output...
View ArticleForum Post: RE: Symmetric 5v from symmetric 30v supply
We have 240v here and its very stable, the actual voltage will be a symmetrical 30.65v, but the difference between 340mv and 500mv is only about 0.02w so I wont bother with the lower forward voltage...
View ArticleForum Post: TPS40304 Soft Start Feature
Hello,I'm designing a power supply to step down a voltage from 4V to 15V down to 3.3V. I have the design in the lab working well, but I have an issue with the soft-start circuit where I believe the...
View ArticleForum Post: RE: 800W resonant converter using UCC25600
When I look through the LLC configuraion, I found the two kind of configuration, such as bridge rectifying and center-tap. What is the big difference between brige rectifying configuration and...
View ArticleForum Post: RE: LM5101A High Side Driver
Hello Sourav Thank you...I shall keep the OUT swing to VDD value in my case. Input of 0-3.3V --> OUT of 0-16.5V (vdd).ThanksSujan
View ArticleForum Post: RE: LM2623 Voltage Ripple
Thank you for the interest in my issue. I'm an amateur at designing switch-mode boost converter circuits, so bare with me. Here are answers to your questions.The frequency components in the voltage...
View ArticleForum Post: RE: Solution to measure the power of AC voltage
Hi Greenja,Thank you for your response. I would like to hear more information from our customer, so can you please give your advice which information we need to narrow the option down?Best Regards,Sonoki
View ArticleForum Post: UCC28950
Hi,I'd like to ask about UCC28950.1) equation about TminIt seems mismatch between equation8(Tmin=5.92xRtmin, datasheet P.18) and Figure.10.In UCC28950 excel design tool, it indicate...
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Forum Post: TPS2490 torubleshooting
I have some trouble with TPS2490 hotswap controler. The design is made to switch off in case of a short circuit at power output. The MosFET is a SUP90N10. Power limit is set at 60W, current limit at...
View ArticleForum Post: RE: bq 24196. Charging&OTG Simultaneously
thanks a lot Sam,still 2 riddles are bothering me:a) why device need 220msec to enter in boost mode and only 1msec to get out? even considering a huge SS time, 220msec seems to me an ethernity...b)...
View ArticleForum Post: RE: bq34z100 problem with bqChem in evaluation software - will...
Heather,I have not been able to reproduce your problem, but we are looking at it.RegardsTom
View ArticleForum Post: RE: LM2623 Voltage Ripple
Hi Daniel,The ESR of the electrolytic is nearly 1ohm. Try placing at least 1uF in parallel with each 100uF electrolytic and try again. The waveforms look normal. You might also try placing a small...
View ArticleForum Post: RE: Noise on input of switching regulator, How does it affect...
Hi Ben,You didn't specify your Vin and Vout specs for your application. We used Webench on the LM22678 for 12V input and 5 V output the the default simulation mentions 20mv p-p. We will use this as the...
View ArticleForum Post: RE: LM2663
Hi Felicia,Thank you for the question. Charge pumps don't regulate their output voltage and are very dependent on capacitor placement. LM2663 has 6V Max Vin so it won't work for the 2nd stage which has...
View ArticleForum Post: RE: USB Charging Detectors TPS2540, TPS2541, TPS2543, TPS2511
Thanks Eric.Please email compatibility list to me.Is there a prelim datasheet for the TPS2513?For a standalone charger the TPS2511 and TPS2546 seem to have the same identification abilitiesaccording to...
View ArticleForum Post: RE: Bq25504 problem
Regarding the wash, I had to find a special board assembler with the ability to wash to 50Mohm sensitivity. If so, then the capacitor is not leaking so board wash is the problem. The capacitor itself...
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