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 = 0.75LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.75 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.75
|Vo| = V
2.Easy
+−12 VSLCR+−6 V

An ideal buck converter turns 12 V into 6 V and delivers 4 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 6 VIo = 4 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 33.6 V at 25 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 33.6 Vf = 25 kHzL = 150 µH
ΔIL = A
4.Medium
+−48 VLSCR = 12 Ω+−160 V

An ideal boost converter turns 48 V into 160 V for a 12 Ω load. Find the average inductor current IL.

Vin​ = 48 VVo​ = 160 VR = 12 Ω
IL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 24 V into −72 V for a 25 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = −72 Vf = 20 kHzR = 25 Ω
Lcrit = µH
6.Hard
+−24 VSLC = 22 µFR = 20 Ω−+−72 V

An ideal buck-boost converter turns 24 V into −72 V for a 20 Ω load at 250 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −72 Vf = 250 kHzC = 22 µFR = 20 Ω
ΔVo = mV

Answer key

  1. 1. |Vo| = 15 V
  2. 2. Iin = 2 A
  3. 3. ΔIL = 2.688 A
  4. 4. IL = 44.44 A
  5. 5. Lcrit = 39.06 µH
  6. 6. ΔVo = 490.9 mV

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