Author Topic: help me find ob5284cp pwm ic or equivalent  (Read 98480 times)

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Offline 800908

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help me find ob5284cp pwm ic or equivalent
« 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.
 

Offline amyk

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #1 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

But you could try asking Onbright about the OB5284 yourself... they might even be willing to send you a sample!
 
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Offline 800908

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #2 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.
« Last Edit: December 06, 2020, 07:22:43 am by 800908 »
 

Offline picburner

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #3 on: December 06, 2020, 07:42:04 am »
The pin connected to positive of cap is 6, pin 7 is not connected.
 
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Offline 800908

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #4 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.
 

Offline amyk

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #5 on: December 07, 2020, 12:31:58 am »
No, I am saying it look similar in pinout, but other specifications could be (very) different.
 
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Offline 800908

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #6 on: December 07, 2020, 05:45:47 am »
OK. thanks.
the Onbright peoples didn't answer my email yet!
 

Offline 800908

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #7 on: December 07, 2020, 06:17:13 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?
 

Offline picburner

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #8 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.
« Last Edit: December 07, 2020, 10:51:13 am by picburner »
 
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Offline 800908

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #9 on: December 17, 2020, 09:17:51 pm »
Pin 7, are you sure?

OB5269 looks similar:

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.
« Last Edit: December 18, 2020, 08:28:54 am by 800908 »
 
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Offline amyk

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #10 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
 

Offline 800908

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #11 on: December 18, 2020, 06:19:37 am »
No. Onbright not even answer my two emails.
i find it on local website.
 

Offline 800908

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Re: help me find ob5284cp pwm ic or equivalent
« Reply #12 on: December 18, 2020, 08:34:29 am »
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.
 


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