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
+−36 VSLCR+−21.6 V

An ideal buck converter turns 36 V into 21.6 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 36 VVo​ = 21.6 VIo = 5 A
Iin = A
2.Easy
+−12 VD = ?LCR−+48 V

An ideal inverting buck-boost converter must produce −48 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = −48 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 160 V at 100 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 160 Vf = 100 kHzL = 330 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 24 V into 9.6 V at 50 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 9.6 Vf = 50 kHzL = 68 µH
ΔIL = A
5.Hard
+−12 VSLC = 220 µFR = 8 Ω−+−18 V

An ideal buck-boost converter turns 12 V into −18 V for an 8 Ω load at 40 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = −18 Vf = 40 kHzC = 220 µFR = 8 Ω
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 36 V into 144 V for a 5 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = 144 Vf = 50 kHzR = 5 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 3 A
  2. 2. D = 0.8
  3. 3. ΔIL = 1.018 A
  4. 4. ΔIL = 1.694 A
  5. 5. ΔVo = 153.4 mV
  6. 6. Lcrit = 2.344 µH

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