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Electronics => Repair => Topic started by: 800908 on December 06, 2020, 06:30:11 am

Title: help me find ob5284cp pwm ic or equivalent
Post by: 800908 on December 06, 2020, 06:30:11 am
hi
this ic is belongs to TV power supply and I can not find datasheet for it.
the part number on is ob5284cp.
pin 4 is ground and pin 7 is Vcc.
it controls 7 Amper mosfet.
I am looking for common pwm that can be found easily.
thanks.
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: amyk on December 06, 2020, 07:11:37 am
Pin 7, are you sure?

OB5269 looks similar:

http://www.on-bright.com/cn/english/products_Ultra_low.htm (http://www.on-bright.com/cn/english/products_Ultra_low.htm)

But you could try asking Onbright about the OB5284 yourself... they might even be willing to send you a sample!
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: 800908 on December 06, 2020, 07:21:08 am
as you can see in this picture after I took off the bad components pin 7 is connected to positive of caps. so it should be Vcc I think.
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: picburner on December 06, 2020, 07:42:04 am
The pin connected to positive of cap is 6, pin 7 is not connected.
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: 800908 on December 06, 2020, 08:31:31 am
oooh. I am so sorry. I am counting the top pins from left!
so are you sure that ob5269cp is the equivalent because if I order this I have to wait a week.
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: amyk on December 07, 2020, 12:31:58 am
No, I am saying it look similar in pinout, but other specifications could be (very) different.
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: 800908 on December 07, 2020, 05:45:47 am
OK. thanks.
the Onbright peoples didn't answer my email yet!
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: 800908 on December 07, 2020, 06:17:13 am
Quote from: amyk on December 07, 2020, 12:31:58 am
No, I am saying it look similar in pinout, but other specifications could be (very) different.
sorry to bother you again.
on that picture the value of big resistor should be less than one ohm but two apps I use on my phone show different.
they say 24.9 ohm.
is it right?
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: picburner on December 07, 2020, 08:35:06 am
Most likely it is a fusible resistor.
0.24 ohm, 5%. The purple violet color should indicate the tripping time as fuse.
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: 800908 on December 17, 2020, 09:17:51 pm
Quote from: amyk on December 06, 2020, 07:11:37 am
Pin 7, are you sure?

OB5269 looks similar:

http://www.on-bright.com/cn/english/products_Ultra_low.htm (http://www.on-bright.com/cn/english/products_Ultra_low.htm)

But you could try asking Onbright about the OB5284 yourself... they might even be willing to send you a sample!
hi
today finally the ob5284cp ob5269cp arrived and it's working.
thanks for helping me.
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: amyk on December 17, 2020, 10:19:54 pm
So OnBright actually sent you a sample of ob5284, or did you buy one from them? :o
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: 800908 on December 18, 2020, 06:19:37 am
No. Onbright not even answer my two emails.
i find it on local website.
Title: Re: help me find ob5284cp pwm ic or equivalent
Post by: 800908 on December 18, 2020, 08:34:29 am
Quote from: amyk on December 17, 2020, 10:19:54 pm
So OnBright actually sent you a sample of ob5284, or did you buy one from them? :o
sorry by mistake I said ob5284cp arrived but actually I ordered ob5269cp from local website and I put it on the board and it working fine.