Question

Example 4.7 The 6.8-V zener diode in the circuit below is specified to have Vz=6.8V at Iz=5mA, rz=20?, and Izk=0.2mA. The supply voltage V+ is nominally 10V but can vary by ±1V. a) Find V0 with no load and with V+ at its nominal value. b) Find the change in V0 resulting from the change in V+ (also known as load regulation). c) Find the change in V0 resulting from connecting a load resistance RL that draws a current IL=1mA, and hence find the load regulation (?V0/?IL) in mV/mA. d) Find the change in when RL=2k?. e) Find the change in when RL=0.5k?. f) What is the minimum value of RL for which the diode still operates in the breakdown region?

          Example 4.7

The 6.8-V zener diode in the circuit below is specified to have Vz=6.8V at Iz=5mA, rz=20?, and Izk=0.2mA. The supply voltage V+ is nominally 10V but can vary by ±1V.

a) Find V0 with no load and with V+ at its nominal value.
b) Find the change in V0 resulting from the change in V+ (also known as load regulation).
c) Find the change in V0 resulting from connecting a load resistance RL that draws a current IL=1mA, and hence find the load regulation (?V0/?IL) in mV/mA.
d) Find the change in when RL=2k?.
e) Find the change in when RL=0.5k?.
f) What is the minimum value of RL for which the diode still operates in the breakdown region?

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Example 4.7

The 6.8-V zener diode in the circuit below is specified to have Vz=6.8V at Iz=5mA, rz=20?, and Izk=0.2mA. The supply voltage V+ is nominally 10V but can vary by ±1V.

a) Find V0 with no load and with V+ at its nominal value.
b) Find the change in V0 resulting from the change in V+ (also known as load regulation).
c) Find the change in V0 resulting from connecting a load resistance RL that draws a current IL=1mA, and hence find the load regulation (?V0/?IL) in mV/mA.
d) Find the change in when RL=2k?.
e) Find the change in when RL=0.5k?.
f) What is the minimum value of RL for which the diode still operates in the breakdown region?

Added by Tonya T.

University Physics with Modern Physics

Hugh D. Young 14th Edition

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Solved by Expert Sri K

09/19/2023

Step 1

- Zener diode voltage, \( V_z = 6.8 \text{V} \) at \( I_z = 5 \text{mA} \) - Zener diode dynamic resistance, \( r_z = 20 \Omega \) - Zener knee current, \( I_{zk} = 0.2 \text{mA} \) - Supply voltage, \( V^* = 10 \text{V} \) (nominal) with a variation of \( \pm 1 Show more…

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Example 4.7: Zener Diode Characteristics and Load Regulation The 6.8-V zener diode in the circuit below is specified to have Vz = 6.8V at Iz = 5mA, rz = 20Ω, and Izk = 0.2mA. The supply voltage V+ is nominally 10V but can vary by ±1V. a) Find V0 with no load and with V+ at its nominal value. b) Find the change in V0 resulting from the change in V+ (also known as load regulation). c) Find the change in V0 resulting from connecting a load resistance RL that draws a current IL = 1mA, and hence find the load regulation (ΔV0/ΔIL) in mV/mA. d) Find the change in when RL = 2kΩ. e) Find the change in when RL = 0.5kΩ. f) What is the minimum value of RL for which the diode still operates in the breakdown region?

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