摘要:
The power supply device comprises a DC-DC converter circuit (8) including a power switch (10) and a driving stage (102). The driving stage (102) has a compensation terminal (102b) on which a compensation voltage (V COMP ) is present and which receives a biasing current (I P ), said driving stage (102) comprising a control circuit (107) having an output terminal connected to a control terminal (11) of the power switch (10) and disconnection-detecting means (105) connected to said compensation terminal (102b) and generating a signal for permanent turning-off of said power switch (10) when the biasing current (I P ) drops below a current-threshold value (I T ). The driving stage (102) moreover comprises over-voltage detecting means (104) connected to the compensation terminal (102b) and generating a signal for temporary turning-off of said power switch (10) when said compensation voltage (V COMP ) exceeds a voltage-threshold value (V T ).