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
+−15 VD = 0.5LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 15 V with a duty cycle D = 0.5 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 15 VD = 0.5
|Vo| = V
3.Medium
+−36 VLSCR = 2 Ω+−120 V

An ideal boost converter turns 36 V into 120 V for a 2 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 120 VR = 2 Ω
IL = A
4.Medium
+−15 VSL = ?CR+−9 V

An ideal buck converter turns 15 V into 9 V at a switching frequency of 20 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.3 A.

Vin​ = 15 VVo​ = 9 Vf = 20 kHzΔIL = 0.3 A
L = µH
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 48 V into 14.4 V for an 8 Ω load at 200 kHz, with L = 220 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 14.4 Vf = 200 kHzL = 220 µHC = 220 µF
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 48 V into 14.4 V for an 8 Ω load at 500 kHz, with L = 47 µH and C = 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 14.4 Vf = 500 kHzL = 47 µHC = 47 µF
ΔVo = mV

Answer key

  1. 1. D = 0.25
  2. 2. |Vo| = 15 V
  3. 3. IL = 200 A
  4. 4. L = 600 µH
  5. 5. ΔVo = 0.6508 mV
  6. 6. ΔVo = 2.282 mV

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