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 VD = 0.5LCR+−Vo​ = ?

An ideal buck converter runs from 36 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.5
Vo = V
2.Easy
+−15 VD = ?LCR−+45 V

An ideal inverting buck-boost converter must produce −45 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = −45 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 9 V into −27 V at 200 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = −27 Vf = 200 kHzL = 330 µH
ΔIL = A
4.Medium
+−12 VSL = ?CR+−3 V

An ideal buck converter turns 12 V into 3 V at a switching frequency of 100 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 1.5 A.

Vin​ = 12 VVo​ = 3 Vf = 100 kHzΔIL = 1.5 A
L = µH
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 48 V into −32 V for an 8 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = −32 Vf = 200 kHzR = 8 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 12 V into 30 V for a 12 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 30 Vf = 100 kHzR = 12 Ω
Lcrit = µH

Answer key

  1. 1. Vo = 18 V
  2. 2. D = 0.75
  3. 3. ΔIL = 0.1023 A
  4. 4. L = 15 µH
  5. 5. Lcrit = 7.2 µH
  6. 6. Lcrit = 5.76 µH

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