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2 Lamp Switching
Before an incandescent or halogen lamp is turned on, the filament temperature and resistance are initially very low. At turn-on, the temperature of the filament starts rising from the ambient temperature.
The low initial resistance causes large inrush current into a lamp, which can be more than 10 times the nominal current. The solid-state switch should allow this inrush current to flow in the wiring harness, but only for a specified time (<100 msec). Once the lamp is fully on, its steady-state current depends on the supplied voltage.
When a lamp is driven in PWM mode, the duty-cycle signal has to be defined in order to keep the lamp's supply voltage at the desired reference RMS voltage. Because of PWMing, the filament can not be heated as rapidly as in the normal ON mode since the supplied electrical power is reduced. The slower heating rate in PWM mode increases the inrush time as compared to the normal ON mode, as Presented In Figure 1.

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