Drive circuit for light emitting diode

A replacement light emitting diode package useable in an illumination device, the replacement light emitting diode package comprising:

• an input voltage and a ground;
• a current control block including a voltage supply connection, a ground connection, a first voltage sense connection, and a second voltage sense connection, the voltage supply connection electrically connected to the input voltage and the ground connection connected to the ground;
• the current control block configured to maintain a constant voltage across the first and second voltage sense connections;
• a current sense resistor connected to the first voltage sense connection;
• a first current adjustment resistor connected between the current sense resistor and the second voltage sense connection;
• a second current adjustment resistor connected between the second voltage sense connection and the input voltage;
• and
• a light emitting diode connected from a point between the current sense resistor and the first current adjustment resistor to the ground, such that adjustment of the input voltage proportionally changes a voltage across the light emitting diode at a constant current.

A medical scope comprising:

• a voltage source electrically connected to a socket, the socket comprising a voltage pin and a ground pin;
• a light emitting diode package sized to fit in the socket, the light emitting diode package including:
• a current control block including a voltage supply connection, a ground connection, a first voltage sense connection, and a second voltage sense connection, the voltage supply connection electrically connected to the voltage pin of the voltage source and the ground connection connected to the ground pin, the current control block configured to maintain a constant voltage across the first and second voltage sense connections;
• a current sense resistor connected to the first voltage sense connection;
• a first current adjustment resistor connected between the current sense resistor and the second voltage sense connection;
• a second current adjustment resistor connected between the second voltage sense connection and the input voltage;
• and
• a light emitting diode connected from a point between the current sense resistor and the first current adjustment resistor to the ground, such that adjustment of the input voltage proportionally changes a voltage across the light emitting diode at a constant current.

A drive circuit for a light emitting diode, the drive circuit comprising:

• an input voltage and a ground;
• a current control block including a voltage supply connection, a ground connection, a first voltage sense connection, and a second voltage sense connection, the voltage supply connection electrically connected to the input voltage and the ground connection connected to the ground, the current control block configured to maintain a constant voltage across the first and second voltage sense connections;
• a current sense resistor connected to the first voltage sense connection;
• a first current adjustment resistor connected between the current sense resistor and the second voltage sense connection;
• a second current adjustment resistor connected between the second voltage sense connection and the input voltage;
• and
• a capacitor connected between the first and second voltage sense connections, the capacitor selected to provide an approximately constant voltage across the first and second voltage sense connections, such that adjustment of the input voltage proportionally changes a voltage across the light emitting diode at a constant current.