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
+−12 VLD = ?CR+−16 V

An ideal boost converter must produce 16 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = 16 V
D =
2.Easy
+−48 VD = 0.5LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 48 V with a duty cycle D = 0.5 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 48 VD = 0.5
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −36 V at 500 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −36 Vf = 500 kHzL = 22 µH
ΔIL = A
4.Medium
+−36 VSL = ?CR+−9 V

An ideal buck converter turns 36 V into 9 V at a switching frequency of 25 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.4 A.

Vin​ = 36 VVo​ = 9 Vf = 25 kHzΔIL = 0.4 A
L = µH
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 24 V into 14.4 V for a 12 Ω load at 40 kHz, with L = 150 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 14.4 Vf = 40 kHzL = 150 µHC = 470 µF
ΔVo = mV
6.Hard
+−36 VLSC = 22 µFR = 25 Ω+−60 V

An ideal boost converter turns 36 V into 60 V for a 25 Ω load at 20 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 60 Vf = 20 kHzC = 22 µFR = 25 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.25
  2. 2. |Vo| = 48 V
  3. 3. ΔIL = 0.8182 A
  4. 4. L = 675 µH
  5. 5. ΔVo = 6.383 mV
  6. 6. ΔVo = 2182 mV

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