Circuit for the operation of at least one led

A driver circuit for at least one LED, the driver circuit comprising:

• input terminals to be connected to an input or operating voltage in the form of a direct current (DC) voltage or a rectified alternating (AC) voltage,
• output terminals to be connected to a load circuit, said load circuit containing the at least one LED,
• an inductor,
• a clocked switch,
• an open-loop control circuit for clocking the switch, said open-loop control circuit comprising an integrated circuit (IC) having input and output pins,
• wherein the open-loop control circuit generates a clock signal for the switch based on at least two actual value signals,
• wherein the two actual value signals are associated with different switching phases of the switch,
• wherein the inductor is connected in such a way that it is charged in one switching phase of the switch and is discharged in another switching phase,
• and wherein a current is driven through the load circuit, at least in the other switching phase,
• such that the two actual value signals are tapped off in different time periods or at different times, but at a common measurement point in the driver circuit.

A driver circuit for at least one LED, the driver circuit comprising:

• input terminals to be connected to an input or operating voltage in the form of a direct current (DC) voltage or a rectified alternating (AC) voltage,
• output terminals to be connected to a load circuit, said load circuit containing the at least one LED,
• an inductor,
• a clocked switch,
• an open-loop control circuit for clocking the switch, said open-loop control circuit comprising an integrated circuit (IC) having input and output pins,
• wherein:
• the open-loop control circuit generates a clock signal for the switch based on at least two actual value signals,
• the two actual value signals are associated with different switching phases of the switch,
• the inductor is connected in such a way that it is charged in one switching phase of the switch and is discharged in another switching phase,
• a current is driven through the load circuit, at least in the other switching phase,
• the input voltage is defined by a potential difference between a reference potential point (ground) and a high potential point,
• the load circuit is connected between the high potential and a mid-potential point of the circuit, and
• the other actual value signal corresponds to a voltage between the mid-potential and the reference potential (ground) and therefore, given a substantially constant input voltage, represents a load circuit voltage during an off phase of the switch,
• such that the two actual value signals are tapped off in different time periods or at different times, but at a common measurement point in the driver circuit.

A driver circuit for at least one LED, the driver circuit comprising:

• input terminals to be connected to an input or operating voltage in the form of a direct current (DC) voltage or a rectified alternating (AC) voltage,
• output terminals to be connected to a load circuit, said load circuit containing the at least one LED,
• an inductor,
• a clocked switch,
• an open-loop control circuit for clocking the switch, said open-loop control circuit comprising an integrated circuit (IC) having input and output pins,
• wherein the open-loop control circuit generates a clock signal for the switch based on at least two actual value signals, a first actual value signal of the at least two actual value signals being a voltage drop across a shunt, which is connected in series with the switch in the on phase of the switch,
• wherein the two actual value signals are associated with different switching phases of the switch,
• wherein the inductor is connected in such a way that it is charged in one switching phase of the switch and is discharged in another switching phase,
• and wherein a current is driven through the load circuit, at least in the other switching phase,
• such that the two actual value signals are tapped off in different time periods or at different times, but at a common measurement point in the driver circuit.