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 = ?CR+−60 V

An ideal boost converter must produce 60 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 60 V
D =
2.Easy
+−48 VD = 0.25LCR+−Vo​ = ?

An ideal buck converter runs from 48 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 48 VD = 0.25
Vo = V
3.Medium
+−24 VSL = ?CR+−9.6 V

An ideal buck converter turns 24 V into 9.6 V at a switching frequency of 25 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 2 A.

Vin​ = 24 VVo​ = 9.6 Vf = 25 kHzΔIL = 2 A
L = µH
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 12 V into 3 V for a 25 Ω load. It switches at 40 kHz with L = 330 µH. Find the peak inductor current Imax.

Vin​ = 12 VVo​ = 3 Vf = 40 kHzL = 330 µHR = 25 Ω
Imax = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 4.8 V for a 5 Ω load at 50 kHz, with L = 47 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 4.8 Vf = 50 kHzL = 47 µHC = 470 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 24 V into 32 V for a 2 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 32 Vf = 20 kHzR = 2 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.4
  2. 2. Vo = 12 V
  3. 3. L = 115.2 µH
  4. 4. Imax = 0.2052 A
  5. 5. ΔVo = 6.519 mV
  6. 6. Lcrit = 7.031 µH

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