Help with equivalent regulator.

[py3m4n]

I have been searching all day trying to find an equivalent match for this regulator. (picture attached)

Going by the markings it might be a Sanken SI-3011ZD but I'm not sure. The main difference is the datasheet for the SI-3011ZD refers to pin 5 as adjust whereas my schematic calls it sense. If there is a difference and someone can explain I would be interested to know what it is.

Here's the datasheet for the SI-3011ZD.

http://www.ic-on-line.cn/view_online...zd_1308667.pdf

At this point any help would be really appreciated!!

Cheers.

[budm]

Re: Help with equivalent regulator.

That pin 5 can be defined as a sensing pin since it looks at the output voltage through the voltage divider resistors for the feedback to maintain the output voltage, the ratio of the two resistor will determine the output voltage. Do you have the SCH of what ever you are working on?

[py3m4n]

Re: Help with equivalent regulator.

Sure do! (see pic) or if you prefer, here is a link to the service manual containing the SCH (page 44 - IC5602).

http://elektrotanya.com/panasonic_tx.../download.html

I am working on a Panasonic TX-26LXD8 LCD TV.

Cheers Bud.

[budm]

Re: Help with equivalent regulator.

Oh yes, it is hooked just as shown in the spec sheet of the SANKEN you provide, as you can see in the service manual, there are two voltage divider resistors for the sensing/feedback pin. It is set up as a 5vdc regulator. Are you getting 5vdc at the Vo pin?
May be you should post this in the TV forum instead.

[py3m4n]

Re: Help with equivalent regulator.

No voltage at the Vo pin, that's why I was hoping someone might be able to guide me on what would be an available equivalent to this IC.

If it comes to it I will start a thread in the T.V forum.

Cheers.

[budm]

Re: Help with equivalent regulator.

What are you getting at Vin and at the Vc (or EN) PIN? The IC may be OK. Also Ohm out the Vo (v output) to ground to see if is shorted to ground by the load.

[py3m4n]

Re: Help with equivalent regulator.

Will do tomorrow it's late here (UK) and I will start a thread in the T.V forum. Thanks for your input budm.

I am getting 5v at the Vin.

[budm]

Re: Help with equivalent regulator.

To get the output voltage the VC (pin1) must have at least 2vdc to turn on the output.