A method for controlling a current in a load comprising: providing a controlled current path including a load configured and arranged to draw current from the controlled current path; controlling current through the load in the controlled current path, in response to first and second aspects of a modulating voltage signal (led_en), by causing a transistor circuit, connected to the controlled current path and including a first transistor in a first current branch, to switch between a current-conducting mode in which the controlled current is drawn through the first current branch, a current-blocking mode in which the controlled current through the first current branch is blocked by breaking a connection in the first current branch; and providing an output of an amplifier to a gate of the first transistor and a gate of a second transistor in a second current branch connected in parallel with the first current branch; providing a first negative feedback loop from a source of the first transistor to an inverting input of the amplifier to provide feedback from the first transistor to the amplifier in the current-conducting mode, wherein the first negative feedback loop includes a first switch; providing a second negative feedback loop from a source of the second transistor to the inverting input of the amplifier to provide feedback from the second transistor to the amplifier in the current-blocking mode, wherein the second negative feedback loop includes a second switch; in response to the first aspect of the modulating voltage signal and in the current-conducting mode, using the transistor circuit to direct current in the controlled current path through the first current branch; and in response to the second aspect of the modulating voltage signal and in the current-blocking mode, suppressing current spikes in the controlled current path to avoid junctions of the first transistor from reaching the breakdown threshold of the first transistor by oppositely controlling the first and second switches in the negative feedback loops to block current in the first current branch and allow current to flow in the second current branch when the connection in the first current branch is broken, thereby to divert the current in the controlled current path from the first current branch to the second current branch. providing a controlled current path including a load configured and arranged to draw current from the controlled current path; controlling current through the load in the controlled current path, in response to first and second aspects of a modulating voltage signal (led_en), by causing a transistor circuit, connected to the controlled current path and including a first transistor in a first current branch, to switch between a current-conducting mode in which the controlled current is drawn through the first current branch, a current-blocking mode in which the controlled current through the first current branch is blocked by breaking a connection in the first current branch; and a current-conducting mode in which the controlled current is drawn through the first current branch, a current-blocking mode in which the controlled current through the first current branch is blocked by breaking a connection in the first current branch; and providing an output of an amplifier to a gate of the first transistor and a gate of a second transistor in a second current branch connected in parallel with the first current branch; providing a first negative feedback loop from a source of the first transistor to an inverting input of the amplifier to provide feedback from the first transistor to the amplifier in the current-conducting mode, wherein the first negative feedback loop includes a first switch; providing a second negative feedback loop from a source of the second transistor to the inverting input of the amplifier to provide feedback from the second transistor to the amplifier in the current-blocking mode, wherein the second negative feedback loop includes a second switch; in response to the first aspect of the modulating voltage signal and in the current-conducting mode, using the transistor circuit to direct current in the controlled current path through the first current branch; and in response to the second aspect of the modulating voltage signal and in the current-blocking mode, suppressing current spikes in the controlled current path to avoid junctions of the first transistor from reaching the breakdown threshold of the first transistor by oppositely controlling the first and second switches in the negative feedback loops to block current in the first current branch and allow current to flow in the second current branch when the connection in the first current branch is broken, thereby to divert the current in the controlled current path from the first current branch to the second current branch.