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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Name: ____________________   Date: ____________

1.Easy
+−9 VLD = ?CR+−45 V

An ideal boost converter must produce 45 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 45 V
D =
2.Easy
+−9 VD = ?LCR−+9 V

An ideal inverting buck-boost converter must produce −9 V from 9 V in continuous conduction. Find the duty cycle D.

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

An ideal buck converter turns 36 V into 14.4 V at 50 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 14.4 Vf = 50 kHzL = 330 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 192 V at 250 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 192 Vf = 250 kHzL = 330 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 48 V into −32 V for a 5 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = −32 Vf = 20 kHzR = 5 Ω
Lcrit = µH
6.Hard
+−36 VSL = 47 µHC = ?R+−14.4 V

A buck converter turns 36 V into 14.4 V at 500 kHz with L = 47 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 10 mV.

Vin​ = 36 VVo​ = 14.4 Vf = 500 kHzL = 47 µHΔVo = 10 mV
C = µF

Answer key

  1. 1. D = 0.8
  2. 2. D = 0.5
  3. 3. ΔIL = 0.5236 A
  4. 4. ΔIL = 0.4364 A
  5. 5. Lcrit = 45 µH
  6. 6. C = 9.191 µF

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