In a fixed-frequency switching power supply,...

Question 1 / 270706QtvRJHUyqm8nr8Hca1z

Question 1 of 270706QtvRJHUyqm8nr8Hca1z

In a fixed-frequency switching power supply, the pulse width of the switching circuit will increase when:

Question 1 of 27070

In a fixed-frequency switching power supply, the pulse width of the switching circuit will increase when:

🔍 Key Concepts

• Fixed-frequency switching power supply behavior under changing load and input conditions • Relationship between pulse width (duty cycle) and maintaining a constant output voltage • How changes in load impedance, load current, output voltage, and input voltage affect the control loop

💭 Think About

• If the supply is designed to keep the output voltage constant, what does the control circuit do to the duty cycle when the load demands more power? • How does a change in load impedance relate to load current for a given output voltage (Ohm’s Law)? • What happens to the required duty cycle when the input voltage is higher or lower, assuming the same output power must be delivered?

✅ Before You Answer

• Identify which option(s) would make the power supply need to deliver more power to the load • Recall that for a fixed-frequency converter, more power usually means more duty cycle (wider pulse), all else equal • Eliminate choices that would naturally make the control loop reduce duty cycle to avoid overvoltage or excess power

Question 1 of 27070

In a fixed-frequency switching power supply, the pulse width of the switching circuit will increase when:

The load impedance decreases.

The load current decreases.

The output voltage increases.

The input voltage increases.

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Question 1 / 270706QtvRJHUyqm8nr8Hca1z

Question 1 of 270706QtvRJHUyqm8nr8Hca1z

In a fixed-frequency switching power supply, the pulse width of the switching circuit will increase when:

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Question 1 of 27070

In a fixed-frequency switching power supply, the pulse width of the switching circuit will increase when: