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 VD = 0.8LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 12 V with a duty cycle D = 0.8 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 12 VD = 0.8
|Vo| = V
2.Easy
+−12 VLSCR+−16 V

An ideal boost converter turns 12 V into 16 V and delivers 4 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 16 VIo = 4 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 24 V into −56 V at 25 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = −56 Vf = 25 kHzL = 330 µH
ΔIL = A
4.Medium
+−36 VSL = ?CR+−21.6 V

An ideal buck converter turns 36 V into 21.6 V at a switching frequency of 40 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.6 A.

Vin​ = 36 VVo​ = 21.6 Vf = 40 kHzΔIL = 0.6 A
L = µH
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 12 V into 3 V for an 8 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 3 Vf = 50 kHzR = 8 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 9 V into 15 V for a 25 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 15 Vf = 50 kHzR = 25 Ω
Lcrit = µH

Answer key

  1. 1. |Vo| = 48 V
  2. 2. Iin = 5.333 A
  3. 3. ΔIL = 2.036 A
  4. 4. L = 360 µH
  5. 5. Lcrit = 60 µH
  6. 6. Lcrit = 36 µH

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