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
+−5 VD = ?LCR−+15 V

An ideal inverting buck-boost converter must produce −15 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = −15 V
D =
2.Easy
+−5 VD = 0.4LCR+−Vo​ = ?

An ideal buck converter runs from 5 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 5 VD = 0.4
Vo = V
3.Medium
+−12 VLSCR = 4 Ω+−20 V

An ideal boost converter turns 12 V into 20 V for a 4 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 20 VR = 4 Ω
IL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 15 V into 6 V for a 4 Ω load. It switches at 200 kHz with L = 22 µH. Find the peak inductor current Imax.

Vin​ = 15 VVo​ = 6 Vf = 200 kHzL = 22 µHR = 4 Ω
Imax = A
5.Hard
+−9 VLSC = 47 µFR = 10 Ω+−12 V

An ideal boost converter turns 9 V into 12 V for a 10 Ω load at 100 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 12 Vf = 100 kHzC = 47 µFR = 10 Ω
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 36 V into 25.2 V for a 25 Ω load at 100 kHz, with L = 150 µH and C = 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 25.2 Vf = 100 kHzL = 150 µHC = 47 µF
ΔVo = mV

Answer key

  1. 1. D = 0.75
  2. 2. Vo = 2 V
  3. 3. IL = 8.333 A
  4. 4. Imax = 1.909 A
  5. 5. ΔVo = 63.83 mV
  6. 6. ΔVo = 13.4 mV

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