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 VLSCR+−20 V

An ideal boost converter turns 12 V into 20 V and delivers 4 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 20 VIo = 4 A
Iin = A
2.Easy
+−9 VLD = ?CR+−18 V

An ideal boost converter must produce 18 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 18 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 36 V into 72 V at 500 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 72 Vf = 500 kHzL = 33 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 24 V into 6 V for a 5 Ω load. It switches at 20 kHz with L = 220 µH. Find the peak inductor current Imax.

Vin​ = 24 VVo​ = 6 Vf = 20 kHzL = 220 µHR = 5 Ω
Imax = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 12 V into −4 V for a 12 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = −4 Vf = 100 kHzR = 12 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 12 V into 40 V for a 20 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 40 Vf = 250 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 6.667 A
  2. 2. D = 0.5
  3. 3. ΔIL = 1.091 A
  4. 4. Imax = 1.711 A
  5. 5. Lcrit = 33.75 µH
  6. 6. Lcrit = 2.52 µH

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