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
+−36 VD = 0.75LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 36 V with a duty cycle D = 0.75 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 36 VD = 0.75
|Vo| = V
2.Easy
+−24 VLD = ?CR+−30 V

An ideal boost converter must produce 30 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 30 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 15 V into 60 V at 20 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 60 Vf = 20 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −4 V at 100 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −4 Vf = 100 kHzL = 150 µH
ΔIL = A
5.Hard
+−36 VSL = 150 µHC = ?R+−25.2 V

A buck converter turns 36 V into 25.2 V at 50 kHz with L = 150 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 100 mV.

Vin​ = 36 VVo​ = 25.2 Vf = 50 kHzL = 150 µHΔVo = 100 mV
C = µF
6.Hard
+−15 VSLC = 220 µFR = 50 Ω−+−15 V

An ideal buck-boost converter turns 15 V into −15 V for a 50 Ω load at 25 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = −15 Vf = 25 kHzC = 220 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. |Vo| = 108 V
  2. 2. D = 0.2
  3. 3. ΔIL = 3.75 A
  4. 4. ΔIL = 0.2 A
  5. 5. C = 25.2 µF
  6. 6. ΔVo = 27.27 mV

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