DC-DC converters worksheet with answers

Free printable DC-DC converters worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
+−15 VD = 0.8LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 15 V with a duty cycle D = 0.8 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 15 VD = 0.8
|Vo| = V
2.Easy
+−36 VD = 0.75LCR+−Vo​ = ?

An ideal buck converter runs from 36 V with a duty cycle D = 0.75 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.75
Vo = V
3.Medium
+−12 VLSCR = 10 Ω+−24 V

An ideal boost converter turns 12 V into 24 V for a 10 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 24 VR = 10 Ω
IL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 24 V into 7.2 V for a 2 Ω load. It switches at 40 kHz with L = 68 µH. Find the peak inductor current Imax.

Vin​ = 24 VVo​ = 7.2 Vf = 40 kHzL = 68 µHR = 2 Ω
Imax = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 15 V into −5 V for a 25 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = −5 Vf = 250 kHzR = 25 Ω
Lcrit = µH
6.Hard
+−9 VLSC = 100 µFR = 5 Ω+−22.5 V

An ideal boost converter turns 9 V into 22.5 V for a 5 Ω load at 25 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 22.5 Vf = 25 kHzC = 100 µFR = 5 Ω
ΔVo = mV

Answer key

  1. 1. |Vo| = 60 V
  2. 2. Vo = 27 V
  3. 3. IL = 4.8 A
  4. 4. Imax = 4.526 A
  5. 5. Lcrit = 28.13 µH
  6. 6. ΔVo = 1080 mV

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