Comments on: About Supply Input To Power IC

By: Jestine Yong

Jestine Yong — Mon, 16 Jul 2012 13:35:16 +0000

In reply to Big P.

Hi Big,

I suggest that you get the original part number http://www.utsource.net/ICE2QS01.html as there is no substitute for this ic.

Jestine

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By: Big P

Big P — Sun, 15 Jul 2012 21:33:24 +0000

I wouldlike to change an ICE2QS01 IC for a DVD player power supply.What can I substitute it with(including other brands) as we dont have them in stock in our area.
Regards

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By: admin

admin — Mon, 05 Dec 2011 06:00:37 +0000

HI George,

Yes you can use but the best replacement is still the nearest wattage which is 1/2 watt.

Jestine

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By: George Agsamosam

George Agsamosam — Mon, 05 Dec 2011 05:33:56 +0000

Sir jestine,

Good day sir, is it ok to replace a 220 ohms 1/4 watts resistor with
220 ohms 2watts resistor?

George

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By: rupinder

rupinder — Tue, 09 Aug 2011 18:55:55 +0000

good job you done

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By: admin

admin — Tue, 21 Sep 2010 18:33:34 +0000

HI Sam,

Thanks for the link and yes this is indeed a new type of design in smps circuit. It does not need start up resistor. Since i have not repair such power supply before thus i do not know why the dc voltage could shoot up to 380vdc. I suggest that you remove the power ic and retest to see if the voltage will go down to 165 vdc. If it is 165 volt then i guess you need to replace the power ic and retest.

Jestine

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By: Sam C

Sam C — Mon, 20 Sep 2010 14:27:21 +0000

Jestine

I am working on an IP (inverter power) board with a shorted primary section. Series bulb flashes brightly twice and all output dead except 5VSB. Voltages are about 10% below spec (SB is 4.8V versus 5.3V). DC at the main filter capacitor shoots up to 380V from 166V, Vcc is 13.9V and HV is 380V. No noticeable voltage spikes at other legs of the Infineon ICE2QS01 PWM IC during power on. I suspect a faulty IC and other primary components seem OK.

This PWM IC can run in standby (Infineon calls it Active Burst) mode whereby it generates just enough gate output to trigger a 1 watt 5V SB circuit. It also has built-in startup cell and there is no need for external startup resistor. Here is its Datasheet
and Application
Note. More and more manufacturers are switching to this type of power IC’s.

I am curious what is your opinion on this and why would the filter capacitor voltage shoot up ?

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By: admin

admin — Wed, 21 Jul 2010 14:14:57 +0000

Hi Waleed,

That was a good sharing-thanks!

Jestine

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By: Waleed

Waleed — Wed, 21 Jul 2010 06:34:45 +0000

I could relate to that because today, I saw and experience what you have mentioned in this article.
I was working on a sat. receiver and there was problem with the power supply. the output voltages were fluctuating. the main voltage was reaching the ic but the voltages out, not stabel. eventually it stopped working. I replaced the ic and the receiver worked like a charm.

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