Patent ID: 7714812

Claim:
A driving circuit for driving a load, the driving circuit comprising: a reference-voltage circuit for generating a reference voltage; an amplifier comprising a first input terminal for receiving the reference voltage, a second input terminal for receiving a feedback voltage from the load, and an output terminal for outputting a high level signal; an adjusting circuit for adjusting a voltage of the load when a resistance of the load changes, wherein the adjusting circuit comprises a metal-oxide semiconductor field-effect transistor comprising a gate electrically connected to the output terminal of the amplifier for receiving the high level signal, a source electrically connected to the load for outputting an output current, and a drain; and a current-setting circuit for setting a value of the output current based on said feedback voltage; wherein the current-setting circuit comprises a first resistor, and one end of the first resistor is electronically connected to said second input terminal, and another end of the first resistor is connected to ground.