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 = ?CR+−60 V

An ideal boost converter must produce 60 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = 60 V
D =
2.Easy
+−24 VLD = ?CR+−80 V

An ideal boost converter must produce 80 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 80 V
D =
3.Medium
+−9 VSL = ?CR+−3.6 V

An ideal buck converter turns 9 V into 3.6 V at a switching frequency of 200 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.3 A.

Vin​ = 9 VVo​ = 3.6 Vf = 200 kHzΔIL = 0.3 A
L = µH
4.Medium
+−36 VSL = ?CR+−25.2 V

An ideal buck converter turns 36 V into 25.2 V at a switching frequency of 100 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.8 A.

Vin​ = 36 VVo​ = 25.2 Vf = 100 kHzΔIL = 0.8 A
L = µH
5.Hard
+−15 VSL = 68 µHC = ?R+−10.5 V

A buck converter turns 15 V into 10.5 V at 500 kHz with L = 68 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 25 mV.

Vin​ = 15 VVo​ = 10.5 Vf = 500 kHzL = 68 µHΔVo = 25 mV
C = µF
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 24 V into 32 V for a 20 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 32 Vf = 500 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.8
  2. 2. D = 0.7
  3. 3. L = 36 µH
  4. 4. L = 94.5 µH
  5. 5. C = 0.9265 µF
  6. 6. Lcrit = 2.813 µH

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