Part Number:TPS22930A
Hi,
TPS22930A shows that it supports controlled inrush current. but can't find the description from datasheet. please kindly suggest how to control the inrush current. My customer has used TPS22930A in their design, but the Cin and CL show that there is a high risk to meet inrush current. please suggest how to improve it or recommend a better device for this case, thanks.
CIN：10UF/0603+100NF/0402
CL： 470UF/7343+10UF x2/0603+100nf x10/0402
We have questions about MC33063.
Question 1.
Does this IC have soft-start?
Question 2.
Please tell us the soft-start time if this IC has soft-start.
Best regards,
Takahiro nishizawa
Part Number:TPS7B63-Q1
Dear expert,
My customer is asking which pin in MCU or Core ship should WDO pin be connected to and how does it work. Since WDO signal is used to reset the MCU when software runs away. But if MCU software runs away, how can it detect that WDO signal is low? Thanks.
Best Regards,
Binbin Wang
Part Number:UCC28630
Hi guys,
my customer uses UCC28630 in a 50W LED power supply. When measuring grid-bound noise (150kHz-30MHz) they notice some peak noise at 700-750kHz, which they were only able to filter out using a RC-Snubber (Drain MOSFET -> GND-AUX). Choke, suppresion capacitor and switching frequency of the MOSFET help everywhere else but not at the mentioned frequency range.
In previously designed lower power supplies they are seeing the same tendencies.
Is this a known phenomenon and can it be mitigated in different way?
They would like to save the reduction of efficiency caused by RC-Snubbers or prefer to move it to the transformer.
Thank you for your support,
Franz
Part Number:BQ34Z100EVM
Hi,
I have a system whereby it is not possible to charge the Lion batteries in situ. They must be charged separately from the system in which they are used.
I.e. when I perform the initial learning cycle in order to optimise the IT parameters, in order to create a Golden Image, I cannot connect the battery pack during the charging phase. I can only switch a fully discharged and relaxed battery with a fully charged one (I can maintain power during the switchover). When I do this, the system never moves from a learned status of 4. The FC flag remains at 0. It seems that the system has not recognised that the battery has moved from a discharge state to a charged state at all. In fact, when I then discharge the battery followed by relaxation, the system remains in learned status 4. The battery has been Chemistry ID'd, with the correct ID and battery parameters loaded into the system.
Observed status was:
Discharged battery, fully relaxed: RUP_DIS 0 VOK 0 OCVTAK 1
Switch to fully charged battery : RUP_DIS 0 VOK 0 OCVTAK 1 (i.e. unchanged)
Discharge cycle : RUP_DIS 0 VOK 1 OCVTAK 1
Discharged battery, fully relaxed: RUP_DIS 0 VOK 0 OCVTAK 1
It seems from the various guides that this is an integral part of optimising the system (indeed, without performing this first learning cycle the system is unusable).
My question, therefore, is to ask whether it is possible to optimise a system without performing the charging cycle in situ? It is similar, I would imagine, to asking how one can optimise the system for a primary battery which has no charging cycle at all, which is, in fact, another task I must accomplish. The documentation does not appear to offer any guidance on how to do this with the BQ34Z100 - G1 device.
All help gratefully received.
Julian
Part Number:TPS65921
Hi Team,
My customer is considering substitution with EOL of TPS65921B1ZQZ.
I use software provided by TI until now, and I would like a power IC that can be used if possible.
Examining PMIC for DM3730, I found TPS65950 and TPS65910.
Can the TPS65950 and TPS65910 use the software?
Please let me know if there is a PMIC compatible with other PMIC.
Best Regards,
Kenji
Part Number:BQ76920
Hello;
What is the capability of the charge/discharge FET drivers? My client's high-side disconnect board uses 5 AUIRF7739L2 mosfets in parallel: 330nC max x 5 ~= 1650nC, or about 165nF @Vgs = 10V. I'm looking at using the bq76200 to drive them, but would prefer to use the 920's low-side drivers if that were possible. The datasheet only lists turn on/off times for a 10nF load. I'm guessing it cannot turn on these FET's.
Thanks
Part Number:TPS65150
Dear Support,
we're using the TPS65150 to drive and LCD panel. I've succesfully used it with the TPS65150EVM, only by tuning a few resistances and one delay capacitor. Since it was working with the EVM, I basically repeated the design of the EVM on my device, adjusting only resistances values and capacitors. But I've a few issues I cannot figure out (sorry, not an analog guy).
What basically happens is that something starts to burn after a few instant after turning on. The problem seems to be related with the first BAT54S of the positive charge pump, the one driven by DRVP, since it always breaks.
Here is my design, do you see something wrong? I've already fixed the FDLY pin wrong connection and I've already added a third BAT54S, as done on the EVM. Whereas the device has a NOMOUNT badge, it means that it has not been placed on the board.
As for now all tests has been performed with no load (LCD disconnected).
Thank you,
Kind Regards
Part Number:TPS737
Hi,
I am interested if the above use case is safe for the TPS73733DCQR or if it can cause damage to it.
Device setup is as follows:
Use Case:
My observation during this use case is that the Vout voltage is seen on Vin.
There is no way for me to disable EN before Vin is disconnected. So my observation seems to match the following from the datasheet "If the EN pin is not driven low, the pass element may be left on because of stored charge on the gate."
My question is if the above use case can cause damage to the TPS737.
Part Number: TPS56121
Hello everyone,
I have a question about the compensation tool (www.ti.com/.../sluc263) for feed feedback loop design. I have redesigned my circuit based on 50kHz Fco and 56-degree Phase Margin. My total System Bode plot and Error Amp Bode plot are shown below. I just want to check to make sure that these plots and values are fine.
I have also redesigned the PCB layout very similar to the given layout in the datasheet. However, I removed all the elements on the back on the put them in the main circuit.
Thanks,
Babak
Part Number: TPS62810-Q1
I'm working on implementing a series of redundant supplies for a safety critical application. Ultimately, I'd like each individual rail to be OR'ed but at the low voltages some of the cores need this seems difficult using the standard TI ideal diode controllers/efuse products.
For these low voltage rails, my current plan is to add a diode in series with the inductor of the TPS62810 that I plan to use to power these rails (see below schematic). This way the switcher regulates the output past the diode, such that the changing forward voltage of the diode with load is accounted for.
My question is will this work? I can deal with the added power burn of the diode, but I worry about stability and interaction with the second redundant converter. How would a TI power management expert suggest implementing redundant 1V supplies that drove the same net?
Thanks!
Trey
Part Number: TPS92638-Q1
Hi Team,
I have a 7 string LED project.
I was informed that "for the unused channel output of TPS92638, connect a proper resistor to GND to avoid any false fault", but, how do I calculate this "proper resistor"?
I tried many values, but, when I have a slow power supply increase, at around 7V, a false fault is flagged.
Thank you in advance,
Julio
Part Number:TPS65916
Hello,
On my board I have a SItara AM5716 and its PMIC TPS659162RGZR.
Below I show the schematics about PMIC
and reset section of Sitara
AM5716_MCLK is a 20MHz clock and SYS_WARMRESETn is high.
For the connections I followed the Figure 2 of "TPS65916 User's Guide to Power AM571x (SLVUA04D)".
The PMIC RESET_OUT (net PMIC_RESET_OUT) and CPU RSTOUTn (net CPU_RSTOUTn) are always low (all the power supply of the PMIC are correct and the PMIC POWERGOOD is high)..
I put a 4.7Kohm to pull-up the PMIC_RESET_OUT and the behaviour of this net and CPU_RSTOUTn are the following:
From the datasheet of the PMIC (SLVSD09B –MARCH 2016–REVISED MARCH 2017) in the paragraph 5.3.4 Device Power Up Timing, I read: "If the time from VCC to VIO is less than 6 ms, the VIO buffers will be supplied while the OTP is still being initialized, which could cause glitches on any VIO output buffer. Supplying VIO at least 6 ms after supplying VCC ensures that the OTP is initialized and output buffers are held low when VIO is
supplied."
So I connected VIO_IN to V3_3D which is up 26ms after 3.3V, but nothing changed.
All the power supply are correct even though VIO_IN is connected to 3.3V which is the VCCA power supply of the PMIC.
Can you help me with this issue?
Thank you
Best regards
Francesco
Part Number:TPS63020
Hi team,
Could you please explain in detail the behavior in Power Save Mode? Is it what we expect? Thanks!
Buck mode: the waveform of L2 pin in green circle in particular
VIN= 5V, VO= 3.3V and no load from EVM. Ch1= L2 pin & Ch3= L1
Boost mode: the waveforms of L1 & L2 pin in green circle in particular
VIN= 3V, VO= 3.3V and no load from EVM. Ch1= L2 pin & Ch3= L1
Best regards,
Sam Ting
Part Number:BQ30Z554-R1
Dear TI Expers,
My customer want to know if TI has updater software of BQ30Z55DBTR-R3, similiar as below sw of BQ40z50-R1. Could you share me this sw for BQ30z55 if it exist ? Thanks a lot.
Part Number:REF34-Q1
Hi Team,
My customer is asking question about long term stability of REF34-Q1.
In REF34-Q1, it is described long term stability as 25ppm@1000hr, but other suppliers device shows its spec as ppm/sqrt(kHr).
Just to compare, what value "25ppm@1000hr" would be if it's expressed in "ppm/sqrt(kHr)"?
Thanks and best regards,
Nobuo Fujihara
Part Number:TPS55165-Q1
Hi team,
My customer is interested in TPS55165-Q1 and asking followings, can you support those?
(1) In case of converter type of device, it would be generally used like adding gate resister, scrubber to external FET.
Is there any way to further improve EMI performance by adding external components?
Will it be effective to put boot resistance to control slew rate of built-in FETs?
(2) Customer wants spread sheet to calculate device Power dissipation, to compare with other suppliers device under specific condition.
Can you provide ore prepare this?
Best regards,
