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Old 27th November 2010, 04:53 AM   #1
Nicx is offline Nicx  Philippines
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Default buck converter using LT3845

hi, has anyone tried using Linear's LT3845 for a buck converter?
i designed a circuit following the application information very carefully.
however, when i test my circuit, even at no load testing using an e-load, the circuit suddenly draws currents as high as 3A (from the DC power supply) thus ruining my chip. even if the surge lasts for about a second, my chip is immediately fried. does anyone have a suggestion on what the possible problem could be? thanks so much!
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Old 27th November 2010, 06:24 AM   #2
TechGuy is offline TechGuy  United States
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Location: Connecticut
Quote:
Originally Posted by Nicx View Post
hi, has anyone tried using Linear's LT3845 for a buck converter?
i designed a circuit following the application information very carefully.
however, when i test my circuit, even at no load testing using an e-load, the circuit suddenly draws currents as high as 3A (from the DC power supply) thus ruining my chip. even if the surge lasts for about a second, my chip is immediately fried. does anyone have a suggestion on what the possible problem could be? thanks so much!
Perhaps you put the Buck Diode (D1) in backwards? Or perhaps your bootstap diode is backwards. Test your mosfets to make sure they are working.
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Old 27th November 2010, 01:50 PM   #3
Nicx is offline Nicx  Philippines
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Join Date: Nov 2010
thanks Tech Guy ive checked my connections, they seem to be just fine. also, my fets are still working.
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