Problem 3 to solve.

Qestions are:

a) Vout at R_Load = 10 Ω

b) Range of values for Rz if the Zener Power Dissipation = 250 mW.

c) Power Dissipation at both T1 and T1.

a) wrote a net loop equation as:

-Vz + Vbe1 + Vbe2 + Vout = 0 V

So, as Vout is not affect by Vin, this is a voltage regulator!

b)

Here I have a question... To be thorough, shouldn't I evaluate 4 values for Rz?

I mean, firstly 2 values for (a) Rz for Vin = 10 V - 2 V = 8 V and (b) for Vin = 10 V + 2 V = 12 V, considering the Iz_min???

Then 2 more values for (c) Rz for Vin = 10 V - 2 V = 8 V and (d) for Vin = 10 V + 2 V = 12 V, considering the Iz_max???

Edited:

I have evaluated for 2 situations, which are Rz for Vin = 8V and for Iz_min which I found to be Rz = 523 Ω and for Vin = 12 V also for Iz_min which found to be Rz = 1.4kΩ

Qestions are:

a) Vout at R_Load = 10 Ω

b) Range of values for Rz if the Zener Power Dissipation = 250 mW.

c) Power Dissipation at both T1 and T1.

a) wrote a net loop equation as:

-Vz + Vbe1 + Vbe2 + Vout = 0 V

**Vout**= 5.6 V - 1.4 V =**4.2 V**

So, as Vout is not affect by Vin, this is a voltage regulator!

b)

Here I have a question... To be thorough, shouldn't I evaluate 4 values for Rz?

I mean, firstly 2 values for (a) Rz for Vin = 10 V - 2 V = 8 V and (b) for Vin = 10 V + 2 V = 12 V, considering the Iz_min???

Then 2 more values for (c) Rz for Vin = 10 V - 2 V = 8 V and (d) for Vin = 10 V + 2 V = 12 V, considering the Iz_max???

Edited:

I have evaluated for 2 situations, which are Rz for Vin = 8V and for Iz_min which I found to be Rz = 523 Ω and for Vin = 12 V also for Iz_min which found to be Rz = 1.4kΩ

Last edited: