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
+−24 VD = 0.25LCR+−Vo​ = ?

An ideal buck converter runs from 24 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.25
Vo = V
2.Easy
+−48 VLD = ?CR+−80 V

An ideal boost converter must produce 80 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = 80 V
D =
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 24 V into 18 V for an 8 Ω load. It switches at 100 kHz with L = 33 µH. Find the peak inductor current Imax.

Vin​ = 24 VVo​ = 18 Vf = 100 kHzL = 33 µHR = 8 Ω
Imax = A
4.Medium
+−24 VSL = ?CR+−6 V

An ideal buck converter turns 24 V into 6 V at a switching frequency of 25 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.4 A.

Vin​ = 24 VVo​ = 6 Vf = 25 kHzΔIL = 0.4 A
L = µH
5.Hard
+−48 VLSC = 22 µFR = 8 Ω+−192 V

An ideal boost converter turns 48 V into 192 V for an 8 Ω load at 200 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 192 Vf = 200 kHzC = 22 µFR = 8 Ω
ΔVo = mV
6.Hard
+−12 VSLC = 100 µFR = 20 Ω−+−28 V

An ideal buck-boost converter turns 12 V into −28 V for a 20 Ω load at 250 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = −28 Vf = 250 kHzC = 100 µFR = 20 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 6 V
  2. 2. D = 0.4
  3. 3. Imax = 2.932 A
  4. 4. L = 450 µH
  5. 5. ΔVo = 4091 mV
  6. 6. ΔVo = 39.2 mV

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