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
+−15 VD = 0.7LCR+−Vo​ = ?

An ideal buck converter runs from 15 V with a duty cycle D = 0.7 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.7
Vo = V
2.Easy
+−36 VD = 0.2LCR+−Vo​ = ?

An ideal buck converter runs from 36 V with a duty cycle D = 0.2 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.2
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −35 V at 100 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −35 Vf = 100 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 9 V into −27 V at 40 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = −27 Vf = 40 kHzL = 68 µH
ΔIL = A
5.Hard
+−36 VLSC = 10 µFR = 5 Ω+−72 V

An ideal boost converter turns 36 V into 72 V for a 5 Ω load at 250 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 72 Vf = 250 kHzC = 10 µFR = 5 Ω
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 48 V into 19.2 V for a 4 Ω load at 200 kHz, with L = 220 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 19.2 Vf = 200 kHzL = 220 µHC = 470 µF
ΔVo = mV

Answer key

  1. 1. Vo = 10.5 V
  2. 2. Vo = 7.2 V
  3. 3. ΔIL = 0.7 A
  4. 4. ΔIL = 2.482 A
  5. 5. ΔVo = 2880 mV
  6. 6. ΔVo = 0.3482 mV

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