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Default Battery Charger Tripping

A charger for a 36volt Electric Bicycle is tripping audibly. The output
voltage with no load rises to only a fraction of the 36v between trips.
Disconnecting the output winding of the switching transformer doesn't stop
the tripping so the fault appears to be aound the TOP247Y IC or the
associated transformer.
Should I be an optimist and buy a new IC?

TIA
John


 
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