Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default STR-W6000S power IC

l am working on a refrigerator board which uses STR-W6000S power ic The resistor to pin 3 of the ic is burnt beyond recognition. l tried to find out from the manufacturers data sheet but all the application circuits there have no value marked on the resistors. can anyone give a typical value or how to figure out this value?

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Default STR-W6000S power IC

wrote:

l am working on a refrigerator board which uses STR-W6000S power ic
The resistor to pin 3 of the ic is burnt beyond recognition.
l tried to find out from the manufacturers data sheet but all
the application circuits there have no value marked on the resistors.
can anyone give a typical value or how to figure out this value?



** The data sheet gives a typical value of 0.27 ohms @ 1 watt - in the table under fig 22. If it burns out, the IC is history.



...... Phil
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Default STR-W6000S power IC

On Saturday, 1 April 2017 19:21:46 UTC, wrote:
l am working on a refrigerator board which uses STR-W6000S power ic The resistor to pin 3 of the ic is burnt beyond recognition. l tried to find out from the manufacturers data sheet but all the application circuits there have no value marked on the resistors. can anyone give a typical value or how to figure out this value?


Thanks l have changed the ic and try that value too
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Default STR-W6000S power IC

Dave M wrote:


The reference design for that chip shows a 0.27 ohm/1W resistor. Select a
low inductance type such as a carbon composition resistor here... definitely
not a wirewound type.


** Good advice, but where do you get carbon composition resistors in that value? The IC will operate fine with readily available metal film types.

And beware, there are some wire wound types that look *exactly* like metal film ones.

I was fooled by this once and the PSU would not start up normally.


..... Phil
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