| 摘要 |
A discrete dimming luminance control circuit for light emitting diode illumination includes first and second control inputs, a first supply circuit between the first control input and an output, a second supply circuit between the second control input and the output, a first shunt circuit between the second control input and the output, and a second shunt circuit between the first control input and the output. The luminance control circuit delivers a first voltage to the output when a supply voltage is applied to the first control input and the second control input is left open, a second voltage when the supply voltage is applied to the second control input and the first control input is left open, a third voltage when the supply voltage is applied to the first control input and the second control input is grounded, and a fourth voltage when the supply voltage is applied to the second control input and the first control input is grounded.
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