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
+−48 VD = ?LCR−+16 V

An ideal inverting buck-boost converter must produce −16 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = −16 V
D =
2.Easy
+−15 VSLCR−+5 V

An ideal buck-boost converter turns 15 V into 5 V and delivers 2 A to its load. Find the average input current Iin.

Vin​ = 15 VVo​ = 5 VIo = 2 A
Iin = A
3.Medium
+−12 VLSCR = 15 Ω+−30 V

An ideal boost converter turns 12 V into 30 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 30 VR = 15 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 24 V into −24 V at 250 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = −24 Vf = 250 kHzL = 22 µH
ΔIL = A
5.Hard
+−9 VLSC = 220 µFR = 5 Ω+−12 V

An ideal boost converter turns 9 V into 12 V for a 5 Ω load at 25 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 12 Vf = 25 kHzC = 220 µFR = 5 Ω
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 24 V into 48 V for an 8 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 48 Vf = 100 kHzR = 8 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.25
  2. 2. Iin = 0.6667 A
  3. 3. IL = 5 A
  4. 4. ΔIL = 2.182 A
  5. 5. ΔVo = 109.1 mV
  6. 6. Lcrit = 5 µH

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