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 = 0.8LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 48 V with a duty cycle D = 0.8 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 48 VD = 0.8
|Vo| = V
2.Easy
+−36 VD = 0.65LCR+−Vo​ = ?

An ideal buck converter runs from 36 V with a duty cycle D = 0.65 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.65
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 30 V at 40 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 30 Vf = 40 kHzL = 330 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 36 V into 21.6 V for a 2.5 Ω load. It switches at 250 kHz with L = 22 µH. Find the peak inductor current Imax.

Vin​ = 36 VVo​ = 21.6 Vf = 250 kHzL = 22 µHR = 2.5 Ω
Imax = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 9 V into 6.3 V for a 5 Ω load at 100 kHz, with L = 22 µH and C = 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 6.3 Vf = 100 kHzL = 22 µHC = 47 µF
ΔVo = mV
6.Hard
+−48 VSL = 330 µHC = ?R+−19.2 V

A buck converter turns 48 V into 19.2 V at 40 kHz with L = 330 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 25 mV.

Vin​ = 48 VVo​ = 19.2 Vf = 40 kHzL = 330 µHΔVo = 25 mV
C = µF

Answer key

  1. 1. |Vo| = 192 V
  2. 2. Vo = 23.4 V
  3. 3. ΔIL = 0.5455 A
  4. 4. Imax = 9.425 A
  5. 5. ΔVo = 22.85 mV
  6. 6. C = 109.1 µF

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