Pulse Switch IC for SMPS

Semiconductor Integrated Circuits (ICs)
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1

is there an equal part for FSQ0465RBWDTU

2

Hello,

Thank you for contacting the DigiKey TechForum. Unfortunately I am not finding any alternative at this time for this product.

3

ok, thank you for checking

4

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).

5

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.

6

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

7

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

8

FSQ0565RQWDTUOS-ND might work.

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

9

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!

10

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.

11

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

12

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

13

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.

14

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