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 VSLCR+−11.25 V

An ideal buck converter turns 15 V into 11.25 V and delivers 4 A to its load. Find the average input current Iin.

Vin​ = 15 VVo​ = 11.25 VIo = 4 A
Iin = A
2.Easy
+−12 VD = 0.65LCR+−Vo​ = ?

An ideal buck converter runs from 12 V with a duty cycle D = 0.65 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.65
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 19.2 V at 50 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 19.2 Vf = 50 kHzL = 68 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 9 V into 18 V at 50 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 18 Vf = 50 kHzL = 150 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 9 V into 5.4 V for a 50 Ω load at 50 kHz, with L = 330 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 5.4 Vf = 50 kHzL = 330 µHC = 220 µF
ΔVo = mV
6.Hard
+−36 VSL = 47 µHC = ?R+−9 V

A buck converter turns 36 V into 9 V at 250 kHz with L = 47 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 10 mV.

Vin​ = 36 VVo​ = 9 Vf = 250 kHzL = 47 µHΔVo = 10 mV
C = µF

Answer key

  1. 1. Iin = 3 A
  2. 2. Vo = 7.8 V
  3. 3. ΔIL = 3.388 A
  4. 4. ΔIL = 0.6 A
  5. 5. ΔVo = 1.488 mV
  6. 6. C = 28.72 µF

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