Patent ID: 11863068
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 0:
1. A driving device, comprising:
an output terminal to output a first control signal;
input terminals configured to be connected respectively with a corresponding terminal of light emitting elements driven by a voltage generated based on the first control signal;
a constant-current driver connected to each of the input terminals;
a control portion configured to generate a pulse signal based on a signal which is input from the input terminals;
an open detection portion connected with each of the input terminals and configured to determine a connection state of the light emitting elements based on a signal that is input into the input terminals;
a current set terminal configured to be connected to a first resistor; and
an over current protection circuit configured to be coupled to a potential between a second resistor and a third resistor,
wherein the driving device is configured such that a second control signal is provided based on a resistance of the first resistor, and current of the constant-current driver is decided based on the second control signal, and an output signal from the over current protection circuit is provided to the control portion.