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 buck converter runs from 15 V with a duty cycle D = 0.8 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.8
Vo = V
2.Easy
+−15 VLD = ?CR+−37.5 V

An ideal boost converter must produce 37.5 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 37.5 V
D =
3.Medium
+−36 VSL = ?CR+−18 V

An ideal buck converter turns 36 V into 18 V at a switching frequency of 250 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.2 A.

Vin​ = 36 VVo​ = 18 Vf = 250 kHzΔIL = 0.2 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 10.8 V at 500 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 10.8 Vf = 500 kHzL = 150 µH
ΔIL = A
5.Hard
+−12 VLSC = 10 µFR = 20 Ω+−48 V

An ideal boost converter turns 12 V into 48 V for a 20 Ω load at 25 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 48 Vf = 25 kHzC = 10 µFR = 20 Ω
ΔVo = mV
6.Hard
+−15 VSLC = 220 µFR = 50 Ω−+−35 V

An ideal buck-boost converter turns 15 V into −35 V for a 50 Ω load at 100 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = −35 Vf = 100 kHzC = 220 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 12 V
  2. 2. D = 0.6
  3. 3. L = 180 µH
  4. 4. ΔIL = 0.1008 A
  5. 5. ΔVo = 7200 mV
  6. 6. ΔVo = 22.27 mV

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