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 VD = 0.5LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 24 V with a duty cycle D = 0.5 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 24 VD = 0.5
|Vo| = V
2.Easy
+−48 VLD = 0.5CR+−Vo​ = ?

An ideal boost converter runs from 48 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 48 VD = 0.5
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 24 V into −24 V at 100 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = −24 Vf = 100 kHzL = 47 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 9 V at 20 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 9 Vf = 20 kHzL = 100 µH
ΔIL = A
5.Hard
+−12 VSLC = 47 µFR = 12 Ω−+−8 V

An ideal buck-boost converter turns 12 V into −8 V for a 12 Ω load at 500 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = −8 Vf = 500 kHzC = 47 µFR = 12 Ω
ΔVo = mV
6.Hard
+−36 VLSC = 47 µFR = 50 Ω+−72 V

An ideal boost converter turns 36 V into 72 V for a 50 Ω load at 100 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 72 Vf = 100 kHzC = 47 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. |Vo| = 24 V
  2. 2. Vo = 96 V
  3. 3. ΔIL = 2.553 A
  4. 4. ΔIL = 3.375 A
  5. 5. ΔVo = 11.35 mV
  6. 6. ΔVo = 153.2 mV

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