/etc... Power

Forum Post: Solar Power Charger Schematic Diagram

Chito Condes — Mon, 20 May 2013 13:47:00 GMT

I need a schematic diagram for a solar power charger to charge my 12volt 45AH lead acid battery from a solar panel. Can anyone help me where to find it? Please forward your reply to cscondes@gmail.com

Thank you and best regards,

Chito

Forum Post: SM74611 Reverse Recovery Time

Guenter Fettig — Tue, 14 May 2013 05:52:00 GMT

Are there any values for reverse recovery time ?

There is no specification in Datasheet.

Forum Post: SM74611 as blocking diode

Hong14351 — Mon, 13 May 2013 20:42:00 GMT

Hello everyone,

SM74611 is designed and marketed as a smart bypassing diode for serial solar panel applications. Has anyone tried it as a blocking diode for solar panel output charging a battery, multiple solar panels parallel operation, or other blokcing diode applications?

Thank you.

David

Forum Post: RE: PMP8251 - POWER for Zynq-7000

greenja — Sun, 05 May 2013 23:12:00 GMT

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 specific features (LDO and SoftStart) that may or may not affect the performance of the device you are connecting to. But just in terms of can it provide a 1.5V output, the answer would be yes.

Thanks,

Forum Post: Strange behaviour of SM72442 MPPT controller!

Deepak Chaturvedi — Tue, 30 Apr 2013 08:56:00 GMT

Hi,

We are building a MPPT controller using SM72442 and experiencing a strange behaviour.

Even when PM signal to the controller is high (4.97V) SM72442 controller continues to stay if panel mode forever.

Voltage level at various ADC pins are A0 = 3.04V, A2 = 0.93V, A4 = 4.07V, A6 = 1.52V

While output voltage divider is set for generating Vout of 43 V, input voltage is 24V.

For any variation in resistive load (tested from 400 mA to 2.14A) we are not finding any change in output voltage levels

We have tried fiddling with the configuration settings but no luck.

Any suggestion on where to/what to look for are welcome.

Thanks!

Deepak

Forum Post: RE: NEED INFORMATION- LM4040C25IDBZ

Ron Michallick — Mon, 29 Apr 2013 13:38:00 GMT

Jayakumara,

Tjc is 76.2C/W.

Forum Post: RE: Solar Micro-inverter solution

Anand Lobo — Sat, 27 Apr 2013 10:08:00 GMT

Greenja,

I am aware of what people would need to do to give me recommendations on my own project, but what about those who have already used particular parts in related (or even unrelated) projects and have a ready answer that I can use as a reference? That is what I am asking for.

What would I gain or lose using the AMC1200 over the AMC1204?
Are there any unusual difficulties to contend with when using the SM72442?
Is the TPS54260 less efficient than the TPS55010?
Does the SM72295 play well with the ISO7242C?

And other things along those lines. This is hardly asking people to do research for me; if one doesn't already know the answer, then they don't need to reply. Better yet, TI themselves, having thoroughly tested all of these devices, can answer easily - I've seen plenty of employee responses to questions like these on other sections of the forum.

Unfortunately, I don't have the talent that you do for reading the Micro-inverter solutions page, because all I can see are recommended parts numbers rather than workable solutions. Yes, I am trawling through datasheets to find the ideal components that would fit the bill, but I'd have to do that anyway whether I was buying from TI or not. The implication of a "solutions" page is being able to more easily narrow down one's component choices by inputting problem constraints, rather than having to search through the datasheet of every single part listed.

Furthermore, what options are available for the DC-DC boost, DC-AC inverter and AC filter stages? The graphic doesn't list any recommended parts for those, which are probably the most significant parts of the whole inverter. I don't know how to design one of them from scratch, that's for sure.

Thank you,
Anand Lobo

Forum Post: RE: Solar Microinverter

Anand Lobo — Wed, 24 Apr 2013 03:37:00 GMT

No replies at all?

I'm asking for help because I'm not exactly an expert at this stuff. I would prefer to get some guidance, or follow a working plan, and make something that works, rather than do it all by my lonesome from scratch and stand a very good chance of shorting everything out.

Forum Post: INVERTER DC/AC

eli — Tue, 23 Apr 2013 15:58:00 GMT

looking for a solution for inverter : 24VDC to 500VAC / low current for UV light (appr 50-100mA).

Do you have any idea for a solution ?

Forum Post: RE: LM4040 as negative reference

Ron Michallick — Fri, 19 Apr 2013 23:13:00 GMT

Dan,

Yes it can be used for a negative reference.
This is an advantage of floating shunt regulators.

Forum Post: RE: TI Solar Micro-Inverter Solution

greenja — Thu, 11 Apr 2013 12:02:00 GMT

The Solar section of the Alternative Energy page has micro inverter designs, take a look through it.

Thanks,

Forum Post: RE: something about TLV431A

Bay Pan — Wed, 03 Apr 2013 01:15:00 GMT

Hi Ron,

Thank you for your reply.

R88 is a filter too,in my understanding.

Should we take out R88?

Forum Post: Required information on Ti 59901M DrMos

Alex Bell — Tue, 02 Apr 2013 21:02:00 GMT

Good time of the day.

Does anybody know where to get datasheet on this part: 59901M? As far as I know it is a Ti DrMos component. It is used in power supply on some of Radeon videocards (68xx-69xx series). Can anybody advise where to buy it in small quantities with worldwide shipping? Thank You.

Forum Post: RE: LM3242, LM3243 etc...RF DCDC / Current limit and themal protectin

Ryuji Asaka — Wed, 27 Mar 2013 23:53:00 GMT

Hello,

I got answer's from TI FAE directly.

Thank you!

Best Regards,

Ryuji Asaka

Forum Post: [Solar USB charger] SM72442

Ge Jin — Thu, 21 Mar 2013 19:24:00 GMT

Hi,

I'm designing a Solar powered USB charger using the chip SM72442.

The output of the DC/DC converter is 5V. The solar panel I'm gonna use is: http://www.digikey.ca/scripts/DKSearch/dksus.dll?Detail&itemSeq=128025819&uq=634994725998788998

Here are my questions:

1. I'm wondering if I can disable the PM model ?

2. Can you suggest a current sensing amplifier that I can use for AIIN and AIOUT.

3.Can you suggest some MOSFETs and didoes for my design.

Wiki: Design Notes

Anonymous — Thu, 21 Mar 2013 12:31:00 GMT

Forum Post: RE: Inquiry regarding LM4040 output tolerance

Ron Michallick — Thu, 21 Mar 2013 10:04:00 GMT

Atsushi,

LM4040 B grade says 0.2% accuracy meaning the voltage is within +/-0.2% of target voltage.
LM4040 C grade says 0.5% accuracy meaning the voltage is within +/-0.5% of target voltage.

Therefore B grade is correct accuracy cross reference.

Forum Post: RE: SM72442 VOUT analog measurement not working

Andrea Solano — Wed, 20 Mar 2013 19:42:00 GMT

Hi Brian,

This is not an answer for your question, but we are needing some help. We are working on our senior design project. We are trying to communicate using the MSP430 launchpad. My i2c code is working when I test it with the MCU alone, however when I write to the sm72442, I do not get the ACK bit back. We have tried everything we can to figure it out, but haven't been successful.

You mentioned you did communicate: What MCU are you using, and did you come up with any problems with the communication?

We are following the datasheet design explicitly. Please if you have an answer we will appreciate it.

Thanks,

Andrea

Forum Post: RE: supply for op-amps -- c. +/-15v ???

Brigitte — Mon, 18 Mar 2013 10:21:00 GMT

Hello M.B.

As far as I understand you, you have 3.3V or 5V available, but need +/-15V for OpAmps. You do not mention the average current you need on these supplies, but I would recommend checking out TPS65130 or TPS65131 (when more current is needed).

Best regards,
Brigitte

Forum Post: RE: Sim of LM5113 with eGaN devices?

Youhao Xi — Fri, 15 Mar 2013 22:35:00 GMT

Sorry I don't have access to pspice. What is the problem? If you can provide me your sim circuit in Pdf, and provide me a detail description of the problem, I can try if I can catch something.