Owon HDS2202S oscilloscope

[danro]

Hi all,

I have this OWON HDS2202S oscilloscope that worked fine until it was used with the wrong probes mounted in the wrong place.
It is not completely dead, it still fulfills some functions. I opened it and found some damaged components inside. I have identified the rest but I cannot identify this IC. I don't think I can find the diagram, but can someone help me identify this component?
It seems to be an LDO regulator. I identified it like this:
Pin1 - Vin
Pin2 - GND
Pin3 - ? (connected with pin1)
Pin4 - ADJ ? (resistive divider between Vout and GND)
Pin5 - Vout

Marking: CHANt

Thank you,

danro

[stj]

does it have an inductor or is it linear?

[danro]

No inductor
It is linear
I think is similar with SL9650 - ADJ, but not sure about Vout value
(https://www.slkoric.com/ldo/SL9650M33SE.html)

[harp]

Have you see:
https://www.eevblog.com/forum/testge...in-dmmawg/675/

[R_J]

The CHAxx is a SGmicro SGM2033-ADJXN5G/TR (250ma) VS the SGM2019 (300ma)

[danro]

Hi,

Sorry but I was away for a few days. Thank you all for the answer.
Ok, CHAXX is SGM2033-ADJ
In my case R1=110k (05D) and R2=39k (393) it results that Vout = 1.2 x (1+R1/R2) = 4.6V
Locally I can't find a supplier for this IC, but I think I can use AP2210K-ADJTRG1 without any modification, having Vout= 1.24 x (1+R1/R2)= 4.74v. Another option would be to use AP2210K-5.0TRG1
Which one do you think would be better use?

Regards

[Agent24]

If the original design was set to specifically 4.6v output then there must be a reason for that.
Going higher to 4.74v or even 5v is probably not a good idea. You may damage something or cause incorrect operation.

Either get the correct chip or change the resistors so you get 4.6v from a different chip.