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 = 0.5LCR+−Vo​ = ?

An ideal buck converter runs from 15 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.5
Vo = V
2.Easy
+−9 VLD = 0.6CR+−Vo​ = ?

An ideal boost converter runs from 9 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.6
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 15 V into 60 V at 100 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 60 Vf = 100 kHzL = 150 µH
ΔIL = A
4.Medium
+−24 VSL = ?CR+−18 V

An ideal buck converter turns 24 V into 18 V at a switching frequency of 50 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.8 A.

Vin​ = 24 VVo​ = 18 Vf = 50 kHzΔIL = 0.8 A
L = µH
5.Hard
+−9 VSLC = 100 µFR = 4 Ω−+−6 V

An ideal buck-boost converter turns 9 V into −6 V for a 4 Ω load at 250 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = −6 Vf = 250 kHzC = 100 µFR = 4 Ω
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 48 V into −16 V for an 8 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = −16 Vf = 25 kHzR = 8 Ω
Lcrit = µH

Answer key

  1. 1. Vo = 7.5 V
  2. 2. Vo = 22.5 V
  3. 3. ΔIL = 0.75 A
  4. 4. L = 112.5 µH
  5. 5. ΔVo = 24 mV
  6. 6. Lcrit = 90 µH

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