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 = 0.8LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.8 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.8
|Vo| = V
2.Easy
+−5 VD = ?LCR−+7.5 V

An ideal inverting buck-boost converter must produce −7.5 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = −7.5 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 5.4 V at 50 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 5.4 Vf = 50 kHzL = 33 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 15 V into 25 V at 250 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 25 Vf = 250 kHzL = 22 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 24 V into 16.8 V for a 10 Ω load at 200 kHz, with L = 150 µH and C = 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 16.8 Vf = 200 kHzL = 150 µHC = 10 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

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

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

Answer key

  1. 1. |Vo| = 20 V
  2. 2. D = 0.6
  3. 3. ΔIL = 1.309 A
  4. 4. ΔIL = 1.091 A
  5. 5. ΔVo = 10.5 mV
  6. 6. Lcrit = 250 µH

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