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 VSLCR−+15 V

An ideal buck-boost converter turns 5 V into 15 V and delivers 2.5 A to its load. Find the average input current Iin.

Vin​ = 5 VVo​ = 15 VIo = 2.5 A
Iin = A
2.Easy
+−9 VLD = ?CR+−45 V

An ideal boost converter must produce 45 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 45 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 6 V at 20 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 6 Vf = 20 kHzL = 68 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 9 V at 50 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 9 Vf = 50 kHzL = 47 µH
ΔIL = A
5.Hard
+−36 VSL = 68 µHC = ?R+−25.2 V

A buck converter turns 36 V into 25.2 V at 200 kHz with L = 68 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 20 mV.

Vin​ = 36 VVo​ = 25.2 Vf = 200 kHzL = 68 µHΔVo = 20 mV
C = µF
6.Hard
+−24 VSLC = 220 µFR = 8 Ω−+−56 V

An ideal buck-boost converter turns 24 V into −56 V for an 8 Ω load at 20 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −56 Vf = 20 kHzC = 220 µFR = 8 Ω
ΔVo = mV

Answer key

  1. 1. Iin = 7.5 A
  2. 2. D = 0.8
  3. 3. ΔIL = 2.206 A
  4. 4. ΔIL = 2.872 A
  5. 5. C = 17.37 µF
  6. 6. ΔVo = 1114 mV

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