Abstract:
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 ).
Abstract:
A linear type of voltage regulator, having at least one input terminal (VBAT) adapted to receive a supply voltage and one output terminal (VOUT) adapted to deliver a regulated output voltage, comprises a power transistor (M1) and a driver circuit for the transistor; the driver circuit comprises essentially an operational amplifier (OP1) having an input differential stage biased by a bias current which varies proportionally with the variations of the regulated output voltage at the output terminal (VOUT) of the regulator.
Abstract:
A by-pass device that uses a power MOS transistor but does not need any inductor and thus be fully integrable uses an oscillator and a charge pump circuit supplied through a protection transistor and a control circuit of a driving stage of the gate of the by-pass MOS transistor depending on the sign of the voltage on the nodes of the group of cells in series and of the by-pass MOS transistor and of the charge voltage of a tank capacitor that supplies the control circuit and the driving stage.
Abstract:
The present invention describes an electric circuit comprising a circuit path (1) from a first reference voltage (VDD) to a second reference voltage (GND) lower than the first reference voltage. The path (1) comprising means (2) for supplying current (I1), at least one capacitor (C1), first switching means (T1) suitable for connecting or disconnecting the capacitor (C1) with respect to the means (2) for supplying current (I1). The first switching means (T1) have a given triggering value (Vth) and the electric circuit comprises second switching means (T2) placed in parallel to the at least one capacitor (C1) and control means (3) suitable for acting on the first (T1) and second (T2) switching means for controlling the charging and discharging of the at least one capacitor (C1). The control means (3) comprise further means (4) operable during the charging of the capacitor (C1) and suitable for acting on the first switching means (T1) for blocking the charging of the capacitor (C1) when the voltage value (Vc1) at its terminals reaches a predefined voltage value (Vref). The predefined voltage value is lower than the triggering voltage (Vth) of the first switching means (T1) and higher than the second reference voltage (GND).