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 VD = ?LCR−+36 V

An ideal inverting buck-boost converter must produce −36 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = −36 V
D =
2.Easy
+−12 VLSCR+−16 V

An ideal boost converter turns 12 V into 16 V and delivers 2.5 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 16 VIo = 2.5 A
Iin = A
3.Medium
+−24 VLSCR = 15 Ω+−40 V

An ideal boost converter turns 24 V into 40 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 40 VR = 15 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −35 V at 40 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −35 Vf = 40 kHzL = 150 µH
ΔIL = A
5.Hard
+−24 VLSC = 470 µFR = 5 Ω+−48 V

An ideal boost converter turns 24 V into 48 V for a 5 Ω load at 20 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 48 Vf = 20 kHzC = 470 µFR = 5 Ω
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 12 V into 30 V for a 50 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 30 Vf = 200 kHzR = 50 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.5
  2. 2. Iin = 3.333 A
  3. 3. IL = 4.444 A
  4. 4. ΔIL = 1.75 A
  5. 5. ΔVo = 510.6 mV
  6. 6. Lcrit = 12 µH

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