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 = 0.5LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.5 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.5
|Vo| = V
2.Easy
+−9 VD = 0.25LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 9 V with a duty cycle D = 0.25 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 9 VD = 0.25
|Vo| = V
3.Medium
+−36 VSL = ?CR+−27 V

An ideal buck converter turns 36 V into 27 V at a switching frequency of 200 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.8 A.

Vin​ = 36 VVo​ = 27 Vf = 200 kHzΔIL = 0.8 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 36 V into −108 V at 40 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = −108 Vf = 40 kHzL = 330 µH
ΔIL = A
5.Hard
+−24 VSLC = 100 µFR = 10 Ω−+−56 V

An ideal buck-boost converter turns 24 V into −56 V for a 10 Ω load at 20 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −56 Vf = 20 kHzC = 100 µFR = 10 Ω
ΔVo = mV
6.Hard
+−12 VSLC = 22 µFR = 25 Ω−+−18 V

An ideal buck-boost converter turns 12 V into −18 V for a 25 Ω load at 40 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = −18 Vf = 40 kHzC = 22 µFR = 25 Ω
ΔVo = mV

Answer key

  1. 1. |Vo| = 5 V
  2. 2. |Vo| = 3 V
  3. 3. L = 42.19 µH
  4. 4. ΔIL = 2.045 A
  5. 5. ΔVo = 1960 mV
  6. 6. ΔVo = 490.9 mV

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