A LED driver system adapted to be coupled to an array of LEDs for driving said array of LEDs, the LED driver system comprising: - a power transistor configured to be selectively activated for generating a driving current (Iset) for the array of LEDs, the power transistor having a first conduction terminal coupled to the array of LEDs and a second conduction terminal coupled to a reference resistor (Rset); - an operational amplifier having a non-inverting input for receiving a reference voltage (Vref), an inverting input coupled to the second conduction terminal of the power transistor, and an output terminal coupled to a first conduction terminal of a transmission gate, said transmission gate having a second conduction terminal coupled to a control terminal of the power transistor and a control terminal for receiving an enable signal, said first and second conduction terminals of the transmission gate being electrically connected to each other when the enable signal is at an enabling value to cause activation of said power transistor, and being electrically insulated from each other when the enable signal is at a disabling value to cause deactivation of said power transistor; - a slew rate control unit configured to control the slew rate of the driving current (Iset), the slew rate control unit being configured to selectively charge an equivalent capacitance at the control terminal of the power transistor through a charging current (Ich) and to selectively discharge said equivalent capacitance through a discharging current (Idsch), said charging current and said discharging current depending at least in part on a target value (Iset(h)) of the driving current, characterised in that the slew rate control unit is configured in such a way to: - set the charging current (Ich) to a first charge value ( Ichc) different from zero and independent from said target value ( Iset(h)) during a first operative phase of the slew rate control unit, - set the charging current (Ich) to a second charge value ( Ichv) different from zero and depending on said target value ( Iset(h)) during a second operative phase of the slew rate control unit following the first operative phase; - set the charging current (Ich) to zero during a third operative phase of the slew rate control unit following said second operative phase; - set the discharging current (Idsch) to a discharge value (Idschv) different from zero and depending on said target value ( Iset(h)) during a fourth operative phase of the slew rate control unit following said third operative phase, - set the discharging current (Idsch) to zero during a fifth operative phase of the slew rate control unit following said fourth operative phase. - a power transistor configured to be selectively activated for generating a driving current (Iset) for the array of LEDs, the power transistor having a first conduction terminal coupled to the array of LEDs and a second conduction terminal coupled to a reference resistor (Rset); - an operational amplifier having a non-inverting input for receiving a reference voltage (Vref), an inverting input coupled to the second conduction terminal of the power transistor, and an output terminal coupled to a first conduction terminal of a transmission gate, said transmission gate having a second conduction terminal coupled to a control terminal of the power transistor and a control terminal for receiving an enable signal, said first and second conduction terminals of the transmission gate being electrically connected to each other when the enable signal is at an enabling value to cause activation of said power transistor, and being electrically insulated from each other when the enable signal is at a disabling value to cause deactivation of said power transistor; - a slew rate control unit configured to control the slew rate of the driving current (Iset), the slew rate control unit being configured to selectively charge an equivalent capacitance at the control terminal of the power transistor through a charging current (Ich) and to selectively discharge said equivalent capacitance through a discharging current (Idsch), said charging current and said discharging current depending at least in part on a target value (Iset(h)) of the driving current, characterised in that - set the charging current (Ich) to a first charge value ( Ichc) different from zero and independent from said target value ( Iset(h)) during a first operative phase of the slew rate control unit, - set the charging current (Ich) to a second charge value ( Ichv) different from zero and depending on said target value ( Iset(h)) during a second operative phase of the slew rate control unit following the first operative phase; - set the charging current (Ich) to zero during a third operative phase of the slew rate control unit following said second operative phase; - set the discharging current (Idsch) to a discharge value (Idschv) different from zero and depending on said target value ( Iset(h)) during a fourth operative phase of the slew rate control unit following said third operative phase, - set the discharging current (Idsch) to zero during a fifth operative phase of the slew rate control unit following said fourth operative phase.