Driving device
A driving device comprises a first transistor (B 13 ), a second transistor (B 14 ), and a resistance element. The first transistor (B 13 ) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B 14 ) 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 (B 13 ), and a control terminal connected to the control terminal of the first transistor (B 13 ). The resistance element is connected between the control terminal of the first transistor (B 13 ) and the other terminal of the first transistor (B 13 ).
1. A light emitting diode (LED) driving device, comprising:
a controller configured to control an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED;
an output current driver configured to generate an output current of the LED;
an LED short-circuit detection circuit configured to monitor a cathode voltage of the LED to perform an LED short-circuit detection;
a first side of an integrated circuit semiconductor device;
a second side of the integrated circuit semiconductor device, the first side and the second side opposing each other;
a first external terminal being on the first side and configured to output a fail signal representing an operation state of the LED short-circuit detection circuit;
a second external terminal being on the second side and configured to be connected to a resistor for setting the output current;
at least one third external terminal being on at least one of the first side or the second side and configured to be connected to a cathode of the LED;
a fourth external terminal configured to be connected to an application node of a PWM signal for LED dimming control;
a fifth external terminal configured to be connected to an application node of the input voltage; and
a sixth external terminal configured to be connected to a load switch, wherein
the LED driving device performs an on/off control of a reference current by using the PWM signal, the reference current serving as a reference for the output current, and
the LED driving device turns off the load switch in an abnormal state.
2. The LED driving device according to claim 1 ,
wherein
the LED short-circuit detection circuit is operable to confirm whether or not the cathode voltage of the LED is equal to or lower than a predetermined threshold voltage, and
the first external terminal and the fifth terminal are on a same side of the integrated circuit semiconductor device.
3. The LED driving device according to claim 2 , wherein the output current driver and the LED short-circuit detection circuit are connected in parallel.
4. The LED driving device according to claim 2 , wherein the output current driver and the LED short-circuit detection circuit are configured to be connected to the cathode of the LED.
5. The LED driving device according to claim 2 , wherein the output current driver and the LED short-circuit detection circuit are connected to the third external terminal.
6. The LED driving device according to claim 2 , wherein the controller, the output current driver, and the LED short-circuit detection circuit are integrated.
7. The LED driving device according to claim 2 , wherein the LED comprises a plurality of LED rows, and each of the plurality of the LED rows comprises a plurality of LEDs connected in series.
8. The LED driving device according to claim 7 , wherein the output voltage generated by the controller determines the cathode voltages of the LED rows.
9. The LED driving device according to claim 1 , wherein
the second external terminal and the fourth external terminal are on a same side.
10. The LED driving device according to claim 1 , wherein
the second external terminal and the fourth external terminal are on different sides respectively.
11. The LED driving device according to claim 10 , wherein
the first external terminal, the fourth external terminal and the fifth external terminal are on a same side.
12. The LED driving device according to claim 1 , wherein
the load switch is connected on the route that extends from the application node of the input voltage to a lead-out node of the output voltage.
13. The LED driving device according to claim 1 , wherein
the second external terminal and the fifth external terminal are on a same side.
14. The LED driving device according to claim 1 , wherein
the fourth external terminal and the fifth external terminal are on a same side.