Forum Post: RE: TPS61097 Quescient Spike
Hello,We have a similar problem with the TPS61070. For power saving, we switch the TPS on and off quite often.It seems to depend on the slowly decent of the output voltage when the output capacitor...
View ArticleForum Post: RE: LP3947 problem
Hi,When you unplug the power to the IC the internal FET should be off. There will be the possibility of a diode drop between the output and the input so reverse biasing the output to the input is not...
View ArticleForum Post: TLC5946 problems setting up Dot and grayscale
Hi,This is what we do:1) MCU Init2) Send DC setting to driver (the value is 63). at oscilloscope signals seems correct3) Send GS settings to driver (the value is 4032). at oscilloscope signals seems...
View ArticleForum Post: RE: TPS61070 Quescient Spike
I split this thread from this one http://e2e.ti.com/support/power_management/non-isolated_dcdc/f/196/t/46954.aspx since it is about a different device.Yes, there can be some higher current consumption...
View ArticleForum Post: The difference between UCC28063 and UCC28061.
IS there other differences between UCC28063 and UCC28061 except UCC28063 has the feature of "Input Filterand Output Capacitor Ripple-Current Cancellation"mentioned in the UCC28063's datasheet?...
View ArticleForum Post: RE: TPS6124x / TPS6125x minimum PFM mode switching frequency
Attached are measurments I made on the TPS61256 and TPS61240 at ~ 2.5Vin & 4.3Vin.At 0mA load the switching frequency does fall into the audio range. By 10mA load the switching > 160kHz.A table...
View ArticleForum Post: RE: DCP011515DBP incorrect output
Zhou:I revewed all e-mail. I recommend the removal of all output loads from this converter. Physically measure the voltages at the pins of the converter:1. Pin 1(Vs) to Pin2 (input ground)2. Pin2 to...
View ArticleForum Post: RE: BQ20z75 BQEasy issues
No, leave the senc extension. The dfi file is a subset of the senc file.
View ArticleForum Post: RE: bq2085 device file for bqEVSW 0.9.59
The software is downloadable from the product page http://www.ti.com/product/bq2085-v1p3 ( I am assuming this is the bq2085 that you are using)Exact link to software: http://www.ti.com/litv/zip/slvc167
View ArticleForum Post: RE: Bq20z65-R1 with Bq24725
MarkusIf you have the [NR] bit set low, then the PRES input can be used. If PRES is low, then the CHG and DSG FETs can turn on. It is is high, then they will open. This may provide the switch...
View ArticleForum Post: What battery charger chip should I use for a portable device that...
I will be using 10-24Ah lithium battery at 7.4 volts. I have been looking at the BQ246xx range. Would this chip be capable of doing that?
View ArticleForum Post: Huge selfdischarge in one 36S1P 40AH cell module controlled by...
Hello: We have developed one module of 36S1P lithium batteries. We use 6 BQ76PL536 to control the cells. We don't know why but sometimes the selfdischarge of the cells is very huge (I mean to...
View ArticleForum Post: RE: UCC39002 Oscillation
Use of the UCC29002/1 fixed the issue and the issue can be closed. There is no longer any oscillation.
View ArticleForum Post: TPS2553 / Absolute maximum current rating
Hi,Our customer need to know the maximum peak current which will damage TPS2553. I think it means maximum rating of power switch located between in and out pin. So can you please let us know following...
View ArticleForum Post: RE: TL783 Figure 20 on Datasheet explaination
Jonathon,Assume that the turn on voltage for all the transistor is 0.7V for this analysis.To get new PNP to start stealing bias from other PNP transistor requires 0.7 Amp (0.7V/1ohm) current to flow...
View ArticleForum Post: RE: LM5118
Hi Eric,I have a question about ground of circuit. In this IC we have 2 ground, that I want trace one of them on the top layer and the other one trace the bottom layer and then connect them with a...
View ArticleForum Post: RE: LM5574 Frequency "Glitch"
Giuseppe, Thanks for your help, I will see when I get back to the lab on Monday if I can get a snapshot of the inductor current. I am sending the top layer again with the addition of the vias tie...
View ArticleForum Post: RE: TPS3838J25 Supervisor Circuit problem
Hi Sarmad,Which schematic are you referring to? Your own or on the first page of the datasheet?The TPS3838 is different than the TPS3836 in that it is an open drain output, so you will need a pull up...
View ArticleForum Post: Peak Current Control Method, Valley current control method and...
Hi,Is there any chip for valley current control method? I don't find this in TI power management guide. He, Siyu
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