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
+−5 VD = 0.6LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.6 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.6
|Vo| = V
2.Easy
+−36 VD = 0.2LCR+−Vo​ = ?

An ideal buck converter runs from 36 V with a duty cycle D = 0.2 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.2
Vo = V
3.Medium
+−12 VSL = ?CR+−7.2 V

An ideal buck converter turns 12 V into 7.2 V at a switching frequency of 500 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.3 A.

Vin​ = 12 VVo​ = 7.2 Vf = 500 kHzΔIL = 0.3 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −45 V at 200 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −45 Vf = 200 kHzL = 220 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 9 V into −27 V for a 50 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = −27 Vf = 250 kHzR = 50 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 15 V into −15 V for a 4 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = −15 Vf = 25 kHzR = 4 Ω
Lcrit = µH

Answer key

  1. 1. |Vo| = 7.5 V
  2. 2. Vo = 7.2 V
  3. 3. L = 19.2 µH
  4. 4. ΔIL = 0.2557 A
  5. 5. Lcrit = 6.25 µH
  6. 6. Lcrit = 20 µH

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