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
+−9 VD = 0.4LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 9 V with a duty cycle D = 0.4 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 9 VD = 0.4
|Vo| = V
2.Easy
+−9 VD = ?LCR+−5.4 V

An ideal buck converter must produce 5.4 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 5.4 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −45 V at 20 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −45 Vf = 20 kHzL = 330 µH
ΔIL = A
4.Medium
+−36 VLSCR = 10 Ω+−144 V

An ideal boost converter turns 36 V into 144 V for a 10 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 144 VR = 10 Ω
IL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 36 V into 21.6 V for a 2 Ω load at 200 kHz, with L = 33 µH and C = 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 21.6 Vf = 200 kHzL = 33 µHC = 47 µF
ΔVo = mV
6.Hard
+−9 VSL = 100 µHC = ?R+−6.3 V

A buck converter turns 9 V into 6.3 V at 25 kHz with L = 100 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 25 mV.

Vin​ = 9 VVo​ = 6.3 Vf = 25 kHzL = 100 µHΔVo = 25 mV
C = µF

Answer key

  1. 1. |Vo| = 6 V
  2. 2. D = 0.6
  3. 3. ΔIL = 1.705 A
  4. 4. IL = 57.6 A
  5. 5. ΔVo = 17.41 mV
  6. 6. C = 151.2 µF

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