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TOP256YN noob question

Posted by: Tsitsias on Fri, 06/25/2021

Hello all, I have a power supply from a projector that has a burnt TOP256YN AC/DC converter. I cannot find TOP256YN to replace it, can I use TOP259YN ?

 

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Submitted by PI-csbabu on Wed, 06/30/2021

Hi,

   TOP256YN has two frequency modes. If frequency pin connected to source, unit switches with 132 kHz frequency and  if connected to control pin, unit switches with 66 KHz. TOP259YN has only one frequency mode of operation i.e  66 kHz. Please check your design before changing the device. If your design operates at 66 kHZ , use appropriate resistance on X pin to limit the current based on datasheet. TOP259YN is rated for higher power, so high current limit.