Can anyone tell me if the Datasheet for the LR645 is correct?
We have wired it up, without the DMOSFET and this works fine for 30mA (Using the 8 pin device). This has been connected up with the trim resistors included for 9V output.
We however want to supply 130mA, so we have wired in the DMOSFET as per the suggested layout in the datasheet, however what we now get is that vout of the LR645 is now tracking that of Vin , i.e. if we have 20V at Vin, we get 20V vout (and not the 9V we set). Suggests that the connection of the DMOSFET to the LR645 is not correct (Tested the DMOSFET to check correct operation as well).
We are testing with DC voltage input at the moment where C1 is, bridge removed