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 VSLCR+−4.8 V

An ideal buck converter turns 12 V into 4.8 V and delivers 1 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 4.8 VIo = 1 A
Iin = A
2.Easy
+−24 VLD = 0.7CR+−Vo​ = ?

An ideal boost converter runs from 24 V with a duty cycle D = 0.7 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.7
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −4 V at 50 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −4 Vf = 50 kHzL = 330 µH
ΔIL = A
4.Medium
+−9 VLSCR = 12 Ω+−36 V

An ideal boost converter turns 9 V into 36 V for a 12 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 36 VR = 12 Ω
IL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 36 V into 21.6 V at 500 kHz with L = 220 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 36 VVo​ = 21.6 Vf = 500 kHzL = 220 µH
Io,min = A
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 24 V into −24 V for a 20 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = −24 Vf = 100 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 0.4 A
  2. 2. Vo = 80 V
  3. 3. ΔIL = 0.1818 A
  4. 4. IL = 12 A
  5. 5. Io,min = 0.03927 A
  6. 6. Lcrit = 25 µH

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