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
+−5 VLSCR+−12.5 V

An ideal boost converter turns 5 V into 12.5 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 5 VVo​ = 12.5 VIo = 5 A
Iin = A
2.Easy
+−12 VD = ?LCR+−2.4 V

An ideal buck converter must produce 2.4 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = 2.4 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 5.4 V at 20 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 5.4 Vf = 20 kHzL = 150 µH
ΔIL = A
4.Medium
+−9 VLSCR = 2 Ω+−36 V

An ideal boost converter turns 9 V into 36 V for a 2 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 36 VR = 2 Ω
IL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 9 V into 12 V for a 20 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 12 Vf = 200 kHzR = 20 Ω
Lcrit = µH
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 6 V for a 10 Ω load at 500 kHz, with L = 100 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 6 Vf = 500 kHzL = 100 µHC = 220 µF
ΔVo = mV

Answer key

  1. 1. Iin = 12.5 A
  2. 2. D = 0.2
  3. 3. ΔIL = 0.72 A
  4. 4. IL = 72 A
  5. 5. Lcrit = 7.031 µH
  6. 6. ΔVo = 0.06818 mV

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