Hi could anyone help me figure out why the MOSFET switch (BTS50085-1TMB) is failing short i.e. the drain and source are failed shorted)?? The IC has got a lot of protection circuits. The drain side is connected to Ultra-Capacitors (48V) and the loading is not that big (just few amps 5-10 Amps, little inductive loads).
Thanks in advance. Any help will be highly appreciated.
mess123 when your question involves a device it is best to include a link to the datasheet so that anyone can access it without having to search.
Datasheet:
@jpanhalt:
This is a smart high side switch so it is connected in the high side, the device is turned on when the input is grounded
You may have the device connected slightly wrong (on the pcb), or the heatsinking may not be sufficient (although it is supposed to be temp limited) - a picture of the hardware along with a picture of the heatsinking used device would be helpful, check that the parts are OK before you use them too! Regards, Orson Cart.
I have the same thermal problems with the BTS50085 ( I used the same schematics). If I have the supply voltage at 50V, the BTS50085 will overheat.
Has anyone found a solution?