Wester547 wrote:Any idea what the extra optocoupler is for? As I understand it, one optocoupler is for UC3843, one for Viper22A, and one for TPS3514.
Probably to enable/disable the UC3843.
Also, 2SK2611 is rated for an ON resistance of 1.4 ohms max and 1.1 typical, and FQAF11N90C 1.1 ohms max and 0.91 ohms typical. That works out to a 27% difference, not a 32% difference.
It says 1.2Ω typical in the datasheet I have for the 2SK2611.
So the typical value is indeed 32% higher for the 2SK2611 than the FQAF11N90C, with the maximum value 27% higher. (If it was 1.1Ω typical for the 2SK2611, like you said, that would be 21% higher than the FQAF11N90C's 0.91Ω.)
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