TEA1532CT GreenChip II SMPS control IC Replacement

[stevekasian]

Hi,

I am desperately looking for a replacement for a discontinued NXP Semiconductor GreenChip II SMPS control IC, part number TEA1532CT.

I have been scouring the internet for about 3 hours and have come up with nothing.

I have a 715T2463-2 Power Board that blew a MOSFET, 2 .1 ohm resistors and other components. I've found that this happens with these boards quite often, and that after replacing the 3 parts mentioned above, it is often times still inoperative. This is exactly my experience as well. So I am on the hunt for each of the parts others have had to replace in this situation, the TEA1532CT being one of those components.

If anybody with any information on this would please reply I would GREATLY appreciate it. Even if you have some technical knowledge that could help me search out a suitable replacement, I would be very grateful!!

Thanks,
SK

[Scenic]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

from what i found out after a quick google search, only the TEA1532BT is discontinued.

http://www.nxp.com/pip/TEA1532BT_TEA1532CT.html

you might wanna try ordering samples from NXP..(!?)

[Wizard]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

What is this power supply used in?

Cheers, Wizard

[jetadm123]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

digikey.com lists a TEA1532T in stock. Not sure what the difference is:

http://search.digikey.com/scripts/Dk...=568-3316-1-ND


Also, if you search in ebay under TEA1532, you'll get several hits.

[stevekasian]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

Thanks!

Scenic: Good call, I'll try that. Any suggestions as to what the best way to go about "ording samples" is? As in, what to tell them to get them to send me "samples" without thinking I'm just trying to repair a power board? lol

jetadm123: There's a B and a C type:

TEA1532CT: general purpose input for latched or safe restart protection and timing, e.g. to be used for OverVoltage Protection (OVP), output short-circuit protection or system OTP)
TEA1532BT: general purpose input for latched protection and timing, e.g. to be used for OVP, output short-circuit protection or system OTP)

So the C allows for safe restart protection & timing, whilst the B does not.

Both C & B have a programmable switching Frequency Range of 100 ~ 150kHz (NXP's datasheet says ~ 128kHz), whilst the others are fixed at 63kHz.

I don't know how important that is in this particular application, so if anyone here does I would appreciate any education on the matter! :-)

Also, Digi-key lists them under different categories:

TEA1532BT: "PMIC - AC DC Converters, Offline Switchers"
TEA1532T/TEA1532AT/TEA1532AP: "PMIC - PFC (Power Factor Correction)"

The TEA1532C* isn't even listed under either of those categories. Strange. I'm so confused by all of this.

Wizard: It is used in a Dynex DX-LCD32 TV (Model 715T2463-2 Power Board).

[Wizard]

Re: TEA1532CT GreenChip II SMPS control IC Replacement



This is SMPS controller IC that controls the power MOSFET.

Take MOSFET transistor out of circuit, use your bench power supply to juice ground and V+ supply on the IC (as specified by datasheet), Do IC output waveforms at all with scope? It may be very short burst, just watch the scope while turning bench power supply on and off.

IC rarely fail, usually the components that go into latchup or shorted diode that limit swing to the MOSFET gate.

Cheers, Wizard

[stevekasian]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

Aaah bummer. I knew I was eventually gonna get into levels of tech where I'd need a scope (and need to know how to use one as well!)

All I have is a multimeter. Is there anything you can recommend in my situation, short of "go get a scope!" ??

Others have reported that this IC went when the exact same components burned - the MOSFET and two .1 ohm resistors. They report a small transistor going as well. Seems to be a common failure on this board for whatever reason. Bad design perhaps.

Thanks.
SK

[Th3_uN1Qu3]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

All I have is a multimeter. Is there anything you can recommend in my situation, short of "go get a scope!" ??

Nope.

[PowerAmpFreak]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

Aaah bummer. I knew I was eventually gonna get into levels of tech where I'd need a scope (and need to know how to use one as well!)

All I have is a multimeter. Is there anything you can recommend in my situation, short of "go get a scope!" ??

Others have reported that this IC went when the exact same components burned - the MOSFET and two .1 ohm resistors. They report a small transistor going as well. Seems to be a common failure on this board for whatever reason. Bad design perhaps.

Thanks.
SK

It's common stuff the SMPS controller IC gets banged when the switch goes shorted. When we design flyback's we try to limit damage in failures like this, but it costs and it's not fully guaranteed. This is how electronic design works nowadays. Without a scope you're left with your multimeter, you could eventually hook up your mm to the IC output and measure duty cycle. That's a sign of life. if you're brave enough you could replace the obviously blown stuff and cross your fingers while you apply mains power.

[stevekasian]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

It's common stuff the SMPS controller IC gets banged when the switch goes shorted. When we design flyback's we try to limit damage in failures like this, but it costs and it's not fully guaranteed. This is how electronic design works nowadays. Without a scope you're left with your multimeter, you could eventually hook up your mm to the IC output and measure duty cycle. That's a sign of life. if you're brave enough you could replace the obviously blown stuff and cross your fingers while you apply mains power.

Thanks for your input! I did replace all shorted/burnt/open items in the circuit already. Still no voltage on the 24v rail.

I'm finally able to take some HQ picts again, so I posted a thread over at the TV Troubleshooting forum to run through this thing once and for all, from top to bottom. (HERE: https://www.badcaps.net/forum/showthread.php?t=13337)

Thanks again!
SK

[BlkSmth]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

I got one of these boards also. The part number is the same but the version is "-4" looks Identical. Which parts did you replace? This one has no 24v either.

[stevekasian]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

Hi BlkSmth,

Just saw your post in here. I had forgotten I even started this thread! It's been like 7 months since I was working on that board.

You have since posted in the thread I linked to above (again, here: https://www.badcaps.net/forum/showthread.php?t=13337 ) that you were hoping to solve the problem by replacing all the same components I did plus the IC referenced in this thread, just as the user "fleetwise" was able to.

This also made me newly aware of the fact that the "C" version of the IC is finally available thru Digi-Key! :-D That is AWESOME!!

So if anyone has come upon this thread and is having problems with this power board, take the link above and you will see a complete start to finish play-by-play of a successful repair job on this board. (Hopefully 2 of them - I'm now waiting for my IC to arrive and will know soon enough if it fixes the issue! And if BlkSmth posts an update there reporting that it fixed his issue as well, that'll make 3 of us! :-)

[japlytic]

Re: TEA1532CT GreenChip II SMPS control IC Replacement

I've seen a few power supplies with a TEA1532 which have the Drain (Pin 8) connected to the HV winding on the transformer, with nothing connected to the Driver (Pin 7) output.
In such a supply, no external MOSFET is used.