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
+−15 VLD = 0.75CR+−Vo​ = ?

An ideal boost converter runs from 15 V with a duty cycle D = 0.75 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.75
Vo = V
2.Easy
+−15 VD = 0.2LCR+−Vo​ = ?

An ideal buck converter runs from 15 V with a duty cycle D = 0.2 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.2
Vo = V
3.Medium
+−9 VLSCR = 4 Ω+−22.5 V

An ideal boost converter turns 9 V into 22.5 V for a 4 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 22.5 VR = 4 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 24 V into −56 V at 500 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = −56 Vf = 500 kHzL = 22 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 48 V into −144 V for a 10 Ω load at 40 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = −144 Vf = 40 kHzR = 10 Ω
Lcrit = µH
6.Hard
+−36 VLSC = 47 µFR = 8 Ω+−48 V

An ideal boost converter turns 36 V into 48 V for an 8 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​ = 48 Vf = 100 kHzC = 47 µFR = 8 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 60 V
  2. 2. Vo = 3 V
  3. 3. IL = 14.06 A
  4. 4. ΔIL = 1.527 A
  5. 5. Lcrit = 7.813 µH
  6. 6. ΔVo = 319.1 mV

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