Abstract: A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.

Abstract: A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.

Abstract: A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.

Abstract: A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.

Abstract: A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string which is driven in an intermittent manner. A sample-and-hold circuit performs sampling of a detection voltage Vs that corresponds to a driving voltage Vout in the on period, and holds the sampled detection voltage Vs in the off period. In the off period, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a hold detection voltage VsH output from the sample-and-hold circuit matches the detection voltage Vs. A driver drives a switching transistor according to the pulse signal.

Abstract: A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string which is driven in an intermittent manner. A sample-and-hold circuit performs sampling of a detection voltage Vs that corresponds to a driving voltage Vout in the on period, and holds the sampled detection voltage Vs in the off period. In the off period, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a hold detection voltage VsH output from the sample-and-hold circuit matches the detection voltage Vs. A driver drives a switching transistor according to the pulse signal.