Pulse Switch IC for SMPS

is there an equal part for FSQ0465RBWDTU

Hello,

Thank you for contacting the Digi-Key Technical forum. Unfortunately I am not finding any alternative at this time for this product.

ok, thank you for checking

FSQ0465RBWDTU can be ordered from the marketplace supplier Rochester Electronics, LLC, Digi-Key # 2156-FSQ0465RBWDTU-FS-ND. The part has a 344 moq.

The closest alternate option, would have a current limit of 3amps. Take a look at 1990-FSQ0465RSWDTU-ND (onsemi FSQ0465RSWDTU) and review the datasheet FSQ0465RS/RB Green-Mode Fairchild Power Switch (FPS™) for Quasi-Resonant Operation - Low EMI and High Efficiency (digikey.com).

Hi Jeff, thank you for replying, I might be reading the data sheet wrong, but it looks like RS has a current limit of 1.8? I’m not real good at reading data sheets but I think I purchased RS and it burned up.

Sorry about that, my mistake. You would be correct.

oh no worries, thank you for your research. The minimum order for Rochester is not really an option for me. any other ideas? I went and looked at my past order and I did purchase the RS. that IC got toasted :slight_smile: so I’m thinking the higher amps is a must

FSQ0565RQWDTUOS-ND might work.

image
Datasheet- fsq0565rs-d.pdf (onsemi.com)

thanks Jeff for your hard work. I’m in brain overload at the moment. I will take a break now and tomorrow compare the original data sheet to this one. The 3.0 Amps current limit is certainly a step in the right direction.
thank you!

Hi Jeff, hopefully I did a decent job of comparing the original part to one you suggested, one item that I noticed was Continuous Drain Current Max; on the original it is 4.00 on the 565RQ it is 2.8. do you think this would have a negative impact on the switch mode power supply? the Power supply is for 47" LCD Vizio TV.

User185

By looking at the data sheets for both of those part I do see that they have different value resistors and capacitors after the bridge and before the 1N4007 diode connected to the Drain , you may have to change those as well for this part to work for you .

Thanks Craig

Hi Craig,

Than you for your reply. I’m a beginner when it comes to electronics and some of this stuff is over my head. When you mention that I might need to change some resistor and capacitors, were you looking at the “Typical Application Circuit” page 9? If yes,it appears to be using FSQ0565RS as a reference. Does it matter that the part I purchased is FSQ0565RQ? Is there an IC that I can purchase that is equal to the original that would not require changing in other components?

Thank you.
Danny

Hi Danny:
Unfortunately the only options we have are the Marketplace version (with a minimum purchase quantity) or the option that Craig mentioned, the FSQ0565RQWDTUOS-ND which you may need to change the resistors and capacitors. I’m sorry we didn’t have anything additional to offer.

Hi Jenny,
Thank you for a very quick reply. Can you answer this question:
When you mention that I might need to change some resistor and capacitors, were you looking at the “Typical Application Circuit” page 19? If yes,it appears to be using FSQ0565RS as a reference. Does it matter that the part I purchased is FSQ0565RQ?

Additionally, if the Typical application Circuit was used for comparison; it is using 250 AC for the input, for my application it is 120 AC.
I appreciate your help.

Danny