Re: Antec Smart Power SP-350 5VSB mod using VIPer 22A pwm chip
I finally was able to make a board to test the Viper27 DIP version. (Sorry I do not have any pictures.) I had the same results with it as I did the SOIC version which is that it would run with a 5.1 ohm load but with a 3.4 ohm load it starts cycling off and on in less than a minute. According to the data sheet this chip should easily handle a 3.4 ohm load so I am not sure what the problem with it actually is and for now I am going to shelf this idea.
I need this supply for actual use in a PC at least for a while so it will get a real world test powering a P4 D and a GTS250. I am using a Viper22A SOIC-8 to power the 5vsb to see how it holds up for an extended period of use.
I finally was able to make a board to test the Viper27 DIP version. (Sorry I do not have any pictures.) I had the same results with it as I did the SOIC version which is that it would run with a 5.1 ohm load but with a 3.4 ohm load it starts cycling off and on in less than a minute. According to the data sheet this chip should easily handle a 3.4 ohm load so I am not sure what the problem with it actually is and for now I am going to shelf this idea.
I need this supply for actual use in a PC at least for a while so it will get a real world test powering a P4 D and a GTS250. I am using a Viper22A SOIC-8 to power the 5vsb to see how it holds up for an extended period of use.
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