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
+−24 VSLCR−+72 V

An ideal buck-boost converter turns 24 V into 72 V and delivers 2.5 A to its load. Find the average input current Iin.

Vin​ = 24 VVo​ = 72 VIo = 2.5 A
Iin = A
2.Easy
+−36 VLD = 0.6CR+−Vo​ = ?

An ideal boost converter runs from 36 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.6
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 3 V at 250 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 3 Vf = 250 kHzL = 68 µH
ΔIL = A
4.Medium
+−36 VLSCR = 20 Ω+−120 V

An ideal boost converter turns 36 V into 120 V for a 20 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 120 VR = 20 Ω
IL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 12 V into −36 V for a 20 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = −36 Vf = 50 kHzR = 20 Ω
Lcrit = µH
6.Hard
+−9 VSLC = 10 µFR = 5 Ω−+−6 V

An ideal buck-boost converter turns 9 V into −6 V for a 5 Ω load at 50 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = −6 Vf = 50 kHzC = 10 µFR = 5 Ω
ΔVo = mV

Answer key

  1. 1. Iin = 7.5 A
  2. 2. Vo = 90 V
  3. 3. ΔIL = 0.1324 A
  4. 4. IL = 20 A
  5. 5. Lcrit = 12.5 µH
  6. 6. ΔVo = 960 mV

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