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 VLD = ?CR+−60 V

An ideal boost converter must produce 60 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 60 V
D =
2.Easy
+−36 VD = ?LCR−+12 V

An ideal inverting buck-boost converter must produce −12 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = −12 V
D =
3.Medium
+−12 VLSCR = 2 Ω+−20 V

An ideal boost converter turns 12 V into 20 V for a 2 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 20 VR = 2 Ω
IL = A
4.Medium
+−15 VSL = ?CR+−6 V

An ideal buck converter turns 15 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​ = 15 VVo​ = 6 Vf = 25 kHzΔIL = 0.4 A
L = µH
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 36 V into −84 V for a 25 Ω load at 40 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = −84 Vf = 40 kHzR = 25 Ω
Lcrit = µH
6.Hard
+−24 VLSC = 47 µFR = 2 Ω+−60 V

An ideal boost converter turns 24 V into 60 V for a 2 Ω load at 250 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 60 Vf = 250 kHzC = 47 µFR = 2 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.6
  2. 2. D = 0.25
  3. 3. IL = 16.67 A
  4. 4. L = 360 µH
  5. 5. Lcrit = 28.13 µH
  6. 6. ΔVo = 1532 mV

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