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
+−36 VD = 0.75LCR−+Vo​ = ?

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

Vin​ = 36 VD = 0.75
|Vo| = V
2.Easy
+−12 VD = 0.75LCR+−Vo​ = ?

An ideal buck converter runs from 12 V with a duty cycle D = 0.75 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.75
Vo = V
3.Medium
+−36 VLSCR = 8 Ω+−144 V

An ideal boost converter turns 36 V into 144 V for an 8 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 144 VR = 8 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 36 V into −54 V at 100 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = −54 Vf = 100 kHzL = 68 µH
ΔIL = A
5.Hard
+−48 VSLC = 22 µFR = 2 Ω−+−144 V

An ideal buck-boost converter turns 48 V into −144 V for a 2 Ω load at 250 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = −144 Vf = 250 kHzC = 22 µFR = 2 Ω
ΔVo = mV
6.Hard
+−9 VLSC = 470 µFR = 50 Ω+−36 V

An ideal boost converter turns 9 V into 36 V for a 50 Ω load at 25 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 36 Vf = 25 kHzC = 470 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. |Vo| = 108 V
  2. 2. Vo = 9 V
  3. 3. IL = 72 A
  4. 4. ΔIL = 3.176 A
  5. 5. ΔVo = 9818 mV
  6. 6. ΔVo = 45.96 mV

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