The circuit shown in Figure P10.38 is used to switch a relay that turns a light off and on under the control of a microcontroller. The relay dissipates 0.5W at 5 VDC. It switches on at 3 VDC and off at 1.0 VDC. What is the maximum frequency with which the light can be switched? The inductance of the relay is 5 mH, and the transistor saturates at 0.2 V, V? = 0.8 V.
Find:
The maximum of frequency with which the light can be switched
The maximum frequency (fmax) should allow the stored energy in the relay dissipates in RW and the voltage of the relay reaches 1(V) that cuts off the relay. If the switching frequency goes above the fmax the voltage of the relay remains high and the light stays ON
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