Problem with Switching regulator U12 on AX3500

11 years 8 months ago #29524897 by hemantdandekar
Dear Sir
I am using AX3500.due to shorting U12 not giving output. I have changed it but track on Pin5 of U12 broken(ON/OFF pin according to data sheet of LM2674).I want to connect jumper wire between pin5 of U12 and other point but i don\'t know where is other point(connection). Please help me.

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11 years 8 months ago #29524898 by cosma
If you leave pin5 unconnected, the controller will turn on when you apply power to Vmot or PowerCtrl. I suggest that you leave it unconnected for now.

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11 years 7 months ago #29524911 by hemantdandekar
Dear Sir
What is the role of RT1 and RT2 on AX3500.

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11 years 7 months ago #29524912 by cosma
These are the temperature sensors. They monitor the mosfet temperatures for each of the output channels.

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