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Can anyone help find a suitable replacement for the following IC?

enter image description here

I have a SMPS few boards SMPS with two different revisions.

IC size SOT23-6

One revision uses 61A51a or 61G52 this IC has:

  • pin 1 (connected to voltage divider: + 100k | 22k - )
  • pin 2 GND
  • pin 3 FB (connected to optocoupler)
  • pin 4 (connected MOSFET 12N65 source,) maybe sense
  • pin 5 Drive (connected to MOSFET gate via transistor W2A 42)
  • pin 6 VCC

On the other revision, the board changed only the PWM IC and the correspondent traces.

The PWM IC is marked 6853K45. It looks like the CR6853, pin compatible to SG6848 and others.

  • GND pin 1
  • FB pin 2
  • RI pin 3
  • Gate pin 6
  • VCC pin 5
  • Sense Pin 4
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  • \$\begingroup\$ Welcome! For component identification, a photo would help a lot. \$\endgroup\$
    – winny
    Commented Dec 3 at 12:04
  • \$\begingroup\$ Will post ASAP @winny \$\endgroup\$
    – Carlos Castro
    Commented Dec 3 at 12:38

1 Answer 1

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It's probably an On-Bright OB2361MP PWM controller.

enter image description here

There are some variations in the markings when you search for pictures online, but here is one from taobao that shows similar markings:

enter image description here

(Source: taobao.com)

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