Variable resistance device for reduced power dissipation in a dimmer circuit

A variable resistance device may be used in a dimmer compatibility circuit to reduce power dissipation in an integrated circuit of the dimmer compatibility circuit. For example, the integrated circuit may include switches coupled to resistors external to the integrated circuit. The integrated circuit may operate the switches to commutate among the external resistors and select a voltage drop that reduces a voltage at a drain voltage of the switches. The reduced drain voltage reduces power dissipation in the switches and instead dissipates the power in the external resistors. 可变电阻器件可以在调光器兼容电路中用于减小调光器兼容电路的集成电路中的功率消耗。例如，集成电路可以包括耦合至在集成电路外部的电阻器的开关。集成电路可以操作开关，以在外部的电阻器之间转换并且选择减少开关的漏极电压处的电压的电压降。减小的漏极电压减小开关中的功率消耗，并且代之在外部电阻器中消耗功率。