Driving device
AssigneeRohm Co., Ltd.
InventorsShinji Kawata, Yoichi Kajiwara
Life of this patent
Estimating the term…
Abstract
A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
Claims9
An LED driver comprising:
- a voltage step-up and -down DC/DC converter controller block which controls a voltage step-up and -down DC/DC converter that generates from an input voltage an output voltage and feeds the output voltage to an LED;
- and
- a current driver block which generates an output current of the LED,
- wherein the voltage step-up and -down DC/DC converter comprises:
- a first switch of which a first terminal is connected to an application terminal of the input voltage;
- a first diode of which a cathode is connected to a second terminal of the first switch and of which an anode is connected to a ground terminal;
- an inductor of which a first terminal is connected to the second terminal of the first switch;
- a second switch of which a first terminal is connected to a second terminal of the inductor and of which a second terminal is connected to the ground terminal;
- and
- a second diode of which an anode is connected to the second terminal of the inductor and of which a cathode is connected to an anode of the LED.
An LED driver comprising:
- a voltage step-up and -down DC/DC converter controller block which controls a voltage step-up and -down DC/DC converter that generates from an input voltage an output voltage and feeds the output voltage to an LED;
- and
- a current driver block which generates an output current of the LED,
- wherein the current driver block comprises:
- a current set portion which generates a reference current;
- and
- a constant-current driver which generates the output current based on the reference current.
Dependencies are inferred from the claim text.