Forum Post: RE: Turns ratio of flyback transformer calculation
Hi Son.First of all, in order to have a little bit of dynamic, I find that D=0.47 is too high.Usually, 0.4 is the selected value for the design @Vin_min.After this you have to consider losses on your...
View ArticleForum Post: RE: DC to DC Converter
Hi Giora.Have you already considered a single switch forward for your design?Push-pull topology is much more suitable for high currents, with only 80W output power I don't think you are in that...
View ArticleForum Post: RE: PWM IC for SEPIC converter, input operating voltage 20V to 150 V
Hi Sunil.Which are you output specifications?Probably SEPIC isn't the best topology...ByePaolo
View ArticleForum Post: BQ24610 Stat1 is not Hi wenn Charge complet
the connectedbattery isfully charged. 8.39volts, thecharging currentis less than20mAbutStat1is stilllow.which parametermakesStat1Hi
View ArticleForum Post: RE: BQ24250 Evaluation module
Hi Tahar,I have used the real Li-Ion battery and implemented the 5.5.2 section by pressed the READ button in the bq2425x software and changed the input current limit to 100mAMeasure on V#3 is VBAT =...
View ArticleForum Post: RE: Flyback converter with CCM mode
Hi, Paolo-san,As you said, our customer already considered secondary side controller UCC24610 with UCC27801, but it will be added devices and parts. So they are considering CCM PWM controller. They...
View ArticleForum Post: RE: Question bq24163
Hi Bernhard, Please see the charge profile figure in the Data sheet; the figure will help you understand how the VBAT and VSYS behave during the charge cycle. Please note that if the battery is not...
View ArticleForum Post: RE: Hiccup mode of TPS84621
During an over current condition the output voltage will shutdown. Following shutdown the output attempts to recover by iniating a soft-start power up. The device continues this cycle until the load...
View ArticleForum Post: bq20z75 calibration process
Dear all, I have a two questionsQuestion 1:In the TI documentation regarding calilbration it is pointed out that only one type of calibration should be done at the time, e.g. only one box checked and...
View ArticleForum Post: RE: LP38500-ADJ REGULATOR OUTPUT SHORTS TO GROUND
Hi Jeff,This problem has been solved. The problem was the input to the LDO dropped sudenly such that the output was at a higher voltage than the input and damaged the regulator. This is one of the...
View ArticleForum Post: RE: TPS23750 - PMP5592 layout
Hello, I have posted the gerber and pcb files for PMP1436.
View ArticleForum Post: RE: BQ34Z100 I2C Communication
Ralf, I am using the standard bq34z100EVM. I have it configured for 4-cells and the J2 jumper set to 16V. The most common reasons why users does not see the correct SOC are that they have not...
View ArticleForum Post: transformer calculations
Dear forum,I have design a solution from AC to DC in webench the online tool from Ti. The problem i have is how to calculate the transformer (core , turns etc) from the information that webench provide...
View ArticleForum Post: RE: synchronization pin of 28950
question:is this sync freq requirements different from UCC1895? you say 1.8xfs, which freq will that be? Output inductor freq is 2xdiagonal switch freq. If inductor freq is 600 kHz, will this mean sync...
View ArticleForum Post: RE: UCC28950
Mike-sanquestion:we are using the older UCC1895 & it has the single core triple 1:1:1 gate drive xmfr for A-B & another for C-D legs. Can this still be used with UCC28950?
View ArticleForum Post: RE: Fuel gauge
They can be used on an I2C bus. You will just have to maintain the timing characteristics/protocol of SMBus specs. You may also want to look into the bq34z1xx series. These support 1-16 sthanksOnyx
View ArticleForum Post: No output
Hi Everybody Could someone help me with an answer to why I am only seeing 8 volts onto the chip U2 (UC3845N). I am not an electronics expert but generally know enough to get by. The problem is that...
View ArticleForum Post: RE: BQ25570 EVM Simplest Hookup
I repeat the test with the same jumper setting, and the result shows as below.LuxVstat (J5)(V)Vbatt(J8)(V)Vout(J11)(V)2801.51.705304.174.17010504.164.17020804.164.170.0341204.164.170.03
View ArticleForum Post: RE: LP2950-N Junction-to-Ambient thermal resistance for TO-252
A formal request has been submitted (#5195) for thermal simulation of LP2950CDT-x.x.The que of requests ahead of this is not too bad, so I expect the results to be available by 22-Nov-13.
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