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
+−48 VSLCR+−36 V

An ideal buck converter turns 48 V into 36 V and delivers 2.5 A to its load. Find the average input current Iin.

Vin​ = 48 VVo​ = 36 VIo = 2.5 A
Iin = A
2.Easy
+−36 VLD = ?CR+−180 V

An ideal boost converter must produce 180 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 180 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 5.4 V at 40 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 5.4 Vf = 40 kHzL = 47 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 8.4 V at 500 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 8.4 Vf = 500 kHzL = 22 µH
ΔIL = A
5.Hard
+−24 VLSC = 22 µFR = 25 Ω+−96 V

An ideal boost converter turns 24 V into 96 V for a 25 Ω load at 40 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 96 Vf = 40 kHzC = 22 µFR = 25 Ω
ΔVo = mV
6.Hard
+−36 VLSC = 220 µFR = 2 Ω+−72 V

An ideal boost converter turns 36 V into 72 V for a 2 Ω load at 100 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 72 Vf = 100 kHzC = 220 µFR = 2 Ω
ΔVo = mV

Answer key

  1. 1. Iin = 1.875 A
  2. 2. D = 0.8
  3. 3. ΔIL = 1.149 A
  4. 4. ΔIL = 0.2291 A
  5. 5. ΔVo = 3273 mV
  6. 6. ΔVo = 818.2 mV

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