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
+−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
2.Easy
+−15 VD = 0.3LCR+−Vo​ = ?

An ideal buck converter runs from 15 V with a duty cycle D = 0.3 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.3
Vo = V
3.Medium
+−12 VSL = ?CR+−9 V

An ideal buck converter turns 12 V into 9 V at a switching frequency of 250 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.5 A.

Vin​ = 12 VVo​ = 9 Vf = 250 kHzΔIL = 0.5 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 36 V into −36 V at 25 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = −36 Vf = 25 kHzL = 220 µH
ΔIL = A
5.Hard
+−48 VLSC = 47 µFR = 8 Ω+−160 V

An ideal boost converter turns 48 V into 160 V for an 8 Ω load at 40 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 160 Vf = 40 kHzC = 47 µFR = 8 Ω
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 9 V into 15 V for an 8 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 15 Vf = 20 kHzR = 8 Ω
Lcrit = µH

Answer key

  1. 1. Vo = 96 V
  2. 2. Vo = 4.5 V
  3. 3. L = 18 µH
  4. 4. ΔIL = 3.273 A
  5. 5. ΔVo = 7447 mV
  6. 6. Lcrit = 28.8 µH

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