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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Name: ____________________   Date: ____________

1.Easy
+−15 VD = ?LCR+−10.5 V

An ideal buck converter must produce 10.5 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 10.5 V
D =
2.Easy
+−36 VLD = ?CR+−120 V

An ideal boost converter must produce 120 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 120 V
D =
3.Medium
+−12 VSL = ?CR+−9 V

An ideal buck converter turns 12 V into 9 V at a switching frequency of 20 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 1 A.

Vin​ = 12 VVo​ = 9 Vf = 20 kHzΔIL = 1 A
L = µH
4.Medium
+−48 VSL = ?CR+−33.6 V

An ideal buck converter turns 48 V into 33.6 V at a switching frequency of 200 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.6 A.

Vin​ = 48 VVo​ = 33.6 Vf = 200 kHzΔIL = 0.6 A
L = µH
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 9 V into −27 V for a 10 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = −27 Vf = 100 kHzR = 10 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 9 V into 3.6 V for a 12 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 3.6 Vf = 20 kHzR = 12 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.7
  2. 2. D = 0.7
  3. 3. L = 112.5 µH
  4. 4. L = 84 µH
  5. 5. Lcrit = 3.125 µH
  6. 6. Lcrit = 180 µH

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