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
+−9 VSLCR−+13.5 V

An ideal buck-boost converter turns 9 V into 13.5 V and delivers 3 A to its load. Find the average input current Iin.

Vin​ = 9 VVo​ = 13.5 VIo = 3 A
Iin = A
2.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 =
3.Medium
+−9 VLSCR = 20 Ω+−15 V

An ideal boost converter turns 9 V into 15 V for a 20 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 15 VR = 20 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 36 V into 60 V at 200 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 60 Vf = 200 kHzL = 22 µH
ΔIL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 12 V into 7.2 V at 25 kHz with L = 22 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 12 VVo​ = 7.2 Vf = 25 kHzL = 22 µH
Io,min = A
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 24 V into 14.4 V for a 5 Ω load at 20 kHz, with L = 220 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 14.4 Vf = 20 kHzL = 220 µHC = 220 µF
ΔVo = mV

Answer key

  1. 1. Iin = 4.5 A
  2. 2. D = 0.25
  3. 3. IL = 1.25 A
  4. 4. ΔIL = 3.273 A
  5. 5. Io,min = 2.618 A
  6. 6. ΔVo = 37.19 mV

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