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 VSLCR+−24 V

An ideal buck converter turns 48 V into 24 V and delivers 4 A to its load. Find the average input current Iin.

Vin​ = 48 VVo​ = 24 VIo = 4 A
Iin = A
2.Easy
+−15 VLD = 0.25CR+−Vo​ = ?

An ideal boost converter runs from 15 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.25
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 3.6 V at 500 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 3.6 Vf = 500 kHzL = 33 µH
ΔIL = A
4.Medium
+−48 VLSCR = 15 Ω+−64 V

An ideal boost converter turns 48 V into 64 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 48 VVo​ = 64 VR = 15 Ω
IL = A
5.Hard
+−15 VSLC = 100 µFR = 25 Ω−+−22.5 V

An ideal buck-boost converter turns 15 V into −22.5 V for a 25 Ω load at 200 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = −22.5 Vf = 200 kHzC = 100 µFR = 25 Ω
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 36 V into 9 V for a 20 Ω load at 200 kHz, with L = 330 µH and C = 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 9 Vf = 200 kHzL = 330 µHC = 100 µF
ΔVo = mV

Answer key

  1. 1. Iin = 2 A
  2. 2. Vo = 20 V
  3. 3. ΔIL = 0.1309 A
  4. 4. IL = 5.689 A
  5. 5. ΔVo = 27 mV
  6. 6. ΔVo = 0.6392 mV

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