2PAC Mafia
Member
Hi guys,
I´m repairing a treadmill board with SMPS integrated. It uses TOP244YN. The power supply is not switching on. I can see the 320Vdc at drain pin but not switching. I have checked the external components involved with TOP244YN and I don´t see anything wrong. I have replaced the the TOP244 by a TOP245 and same behavieur. The coils of transformer seems to be all good, so I don´t know why it don´t try to switch on as start up bias.
I attach a very similar schematic extracted from TOP244YN datasheet.
I´m repairing a treadmill board with SMPS integrated. It uses TOP244YN. The power supply is not switching on. I can see the 320Vdc at drain pin but not switching. I have checked the external components involved with TOP244YN and I don´t see anything wrong. I have replaced the the TOP244 by a TOP245 and same behavieur. The coils of transformer seems to be all good, so I don´t know why it don´t try to switch on as start up bias.
I attach a very similar schematic extracted from TOP244YN datasheet.