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 VLD = 0.5CR+−Vo​ = ?

An ideal boost converter runs from 36 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.5
Vo = V
2.Easy
+−15 VD = 0.5LCR+−Vo​ = ?

An ideal buck converter runs from 15 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.5
Vo = V
3.Medium
+−48 VLSCR = 20 Ω+−64 V

An ideal boost converter turns 48 V into 64 V for a 20 Ω load. Find the average inductor current IL.

Vin​ = 48 VVo​ = 64 VR = 20 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 27 V at 20 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 27 Vf = 20 kHzL = 220 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 3.6 V for a 5 Ω load at 25 kHz, with L = 220 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 3.6 Vf = 25 kHzL = 220 µHC = 220 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 24 V into −56 V for a 4 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = −56 Vf = 50 kHzR = 4 Ω
Lcrit = µH

Answer key

  1. 1. Vo = 72 V
  2. 2. Vo = 7.5 V
  3. 3. IL = 4.267 A
  4. 4. ΔIL = 1.534 A
  5. 5. ΔVo = 10.41 mV
  6. 6. Lcrit = 3.6 µH

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