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 VLD = 0.25CR+−Vo​ = ?

An ideal boost converter runs from 12 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.25
Vo = V
2.Easy
+−9 VD = 0.7LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 9 V with a duty cycle D = 0.7 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 9 VD = 0.7
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 12 V at 500 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 12 Vf = 500 kHzL = 33 µH
ΔIL = A
4.Medium
+−24 VLSCR = 8 Ω+−32 V

An ideal boost converter turns 24 V into 32 V for an 8 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 32 VR = 8 Ω
IL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 9 V into 2.7 V for a 2 Ω load at 500 kHz, with L = 68 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 2.7 Vf = 500 kHzL = 68 µHC = 220 µF
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 15 V into 9 V for a 20 Ω load at 50 kHz, with L = 220 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 9 Vf = 50 kHzL = 220 µHC = 220 µF
ΔVo = mV

Answer key

  1. 1. Vo = 16 V
  2. 2. |Vo| = 21 V
  3. 3. ΔIL = 0.5455 A
  4. 4. IL = 5.333 A
  5. 5. ΔVo = 0.06317 mV
  6. 6. ΔVo = 3.719 mV

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