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
+−12 VD = 0.6LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 12 V with a duty cycle D = 0.6 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 12 VD = 0.6
|Vo| = V
2.Easy
+−5 VD = ?LCR+−2.5 V

An ideal buck converter must produce 2.5 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 2.5 V
D =
3.Medium
+−48 VLSCR = 4 Ω+−160 V

An ideal boost converter turns 48 V into 160 V for a 4 Ω load. Find the average inductor current IL.

Vin​ = 48 VVo​ = 160 VR = 4 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 9 V into −13.5 V at 500 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = −13.5 Vf = 500 kHzL = 150 µH
ΔIL = A
5.Hard
+−24 VSLC = 47 µFR = 50 Ω−+−72 V

An ideal buck-boost converter turns 24 V into −72 V for a 50 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​ = −72 Vf = 250 kHzC = 47 µFR = 50 Ω
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 48 V into −48 V for a 2 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = −48 Vf = 50 kHzR = 2 Ω
Lcrit = µH

Answer key

  1. 1. |Vo| = 18 V
  2. 2. D = 0.5
  3. 3. IL = 133.3 A
  4. 4. ΔIL = 0.072 A
  5. 5. ΔVo = 91.91 mV
  6. 6. Lcrit = 5 µH

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