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 = 0.4LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 36 V with a duty cycle D = 0.4 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 36 VD = 0.4
|Vo| = V
2.Easy
+−5 VD = 0.7LCR+−Vo​ = ?

An ideal buck converter runs from 5 V with a duty cycle D = 0.7 in continuous conduction. Find the output voltage Vo.

Vin​ = 5 VD = 0.7
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 15 V into 10.5 V at 40 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 10.5 Vf = 40 kHzL = 100 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 24 V into 6 V at 20 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 6 Vf = 20 kHzL = 220 µH
ΔIL = A
5.Hard
+−12 VSLC = 10 µFR = 12 Ω−+−8 V

An ideal buck-boost converter turns 12 V into −8 V for a 12 Ω load at 250 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = −8 Vf = 250 kHzC = 10 µFR = 12 Ω
ΔVo = mV
6.Hard
+−36 VSL = 150 µHC = ?R+−27 V

A buck converter turns 36 V into 27 V at 200 kHz with L = 150 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 10 mV.

Vin​ = 36 VVo​ = 27 Vf = 200 kHzL = 150 µHΔVo = 10 mV
C = µF

Answer key

  1. 1. |Vo| = 24 V
  2. 2. Vo = 3.5 V
  3. 3. ΔIL = 0.7875 A
  4. 4. ΔIL = 1.023 A
  5. 5. ΔVo = 106.7 mV
  6. 6. C = 14.06 µF

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