Forum Post: RE: LM2842
Hi Ou,It's possible to add additional soft start to this application by bridging the upper feedback resistor with either a capacitor or other passives that disconnect following the soft start.See...
View ArticleForum Post: TPS63000 not outputting correct voltage
Hi, I'm using a design where Vin is 2 AAA batteries, so Vin would be around 2-2.6V.I have a 10uH inductor, and I originally specified 100uF ceramic capacitors at bother the input and output, but...
View ArticleForum Post: RE: BQ24703 Behavior?
Hello Pedro,Welcome to the Forum!1. There are at least 3 (ACTIVE) options that you can choose from that have Power Path option and can be used with lead acid and multichemistry batteries. They have...
View ArticleForum Post: RE: TPS2490 troubleshooting
In a low voltage system (12V for TPS2490) the input power supply can droop (below UVLO) or the EN pin (if a divider is used) can cycle the part. Try raising the input voltage a volt or two and see the...
View ArticleForum Post: RE: Controller Selection
HI David,Sorry for the delay. I've moved this to the Simple Switcher forum where the correct apps engineer can see the post to help you out.In order to put a PSPICE model in LTSpice, an unencrypted...
View ArticleForum Post: RE: LED drivers with fast PWM clock
We have switch to the TLC5949. It does support 33MHz clock for the PWM but seems to me that the IC cannot generate it's own clock. I will use an external clock.
View ArticleForum Post: RE: LM2735 question
Many thanks Anston, i have used Webench tool in this day and it's pretty helpful, but i have two problems:i would have the possibility to regulate output voltage by trimmer, if i set by pot the output...
View ArticleForum Post: Startup problem with TPS54525
I have experienced some startup-problem with the TPS54525. My system consists of a webench-designed converter using TPS54525 with 6-10V input and 5V 4A output. The converter powers a ETX type...
View ArticleForum Post: RE: bq51013 shielding
Can you tell me what material is sheild of a coil is made of?
View ArticleForum Post: RE: LM5116 Keeps Failing
Hi,with "very low gate-charge"-FETS (<20nC) and a 2.2 Ohm gate resistor at the upper FET the DCDC works. But I don't know whether the gate resistor is required or not.Thank you!Regards,Stefan
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Forum Post: Hot LM25119 problem
I built a LM25119 with webench assisted values. Input =18V, output 5V and 12VOutputs are OK but there is heat problem with the controller that it becomes hot(untouchable) in about 10seconds even at no...
View ArticleForum Post: RE: TPS57112q1 (=TPS54218): how to accelerate the controller...
Thanks John!it would be very helpful if I could select the type of compensation network type e.g. III.I have tried to surpass the design by changing cross over frequency to 300kHz (recommendation by...
View ArticleForum Post: RE: bq24271 current limit question
Yes, according to the specs you are correct. I will have to edit my previous post to include the distinction between the devices as outlined in the data sheet.Thanks,
View ArticleForum Post: RE: PMP8251 - POWER for Zynq-7000
Hello Roie,From the TPS54325 product page, it states that "The output voltage can be programmed between 0.76 V and 5.5 V."You should be able to use it instead of the TPS74201. There will be a loss of...
View ArticleForum Post: RE: TPS65251-Q1 Filure Rate of internal each functional blocks
Hello,Please anyone answer to my question.Regards.
View ArticleForum Post: RE: bq34z100 problem with bqChem in evaluation software - will...
Heather,Can you attach the gg file with your setup to this message string and I will import it and the ChemID into a device? I will send a senc file with this setup to you tomorrow.regardsTom
View ArticleForum Post: RE: bq24072TRGTT block not works att all
Hi,Still the problem not resolved with bq24072TRGTT . Input voltage 5V fro USB input. Battery input 3.7V, Output few mili volts. The device its hand soldered maybe the big pad under the chip not...
View ArticleForum Post: RE: TPS40170 EN pin damage
Hi Anthony, no the EN pin was driven by a CMOS logic chip which had its OE# pin pulled up with a resistor. This OE pin had a capacitor put on it by mistake and the result was that internal leakage...
View ArticleForum Post: TPS40170 high side FET damaged
I had some SMPS's using the TPS410170 fail testing in a production run. Some of these have the high side FET damaged. I don't have the full information yet as our production is done in a different...
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