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
+−15 VD = ?LCR+−12 V

An ideal buck converter must produce 12 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 12 V
D =
2.Easy
+−5 VLD = ?CR+−20 V

An ideal boost converter must produce 20 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 20 V
D =
3.Medium
+−36 VLSCR = 2.5 Ω+−48 V

An ideal boost converter turns 36 V into 48 V for a 2.5 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 48 VR = 2.5 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 48 V into −16 V at 50 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = −16 Vf = 50 kHzL = 68 µH
ΔIL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 36 V into 9 V at 40 kHz with L = 47 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 36 VVo​ = 9 Vf = 40 kHzL = 47 µH
Io,min = A
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 36 V into 18 V for an 8 Ω load at 200 kHz, with L = 150 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 18 Vf = 200 kHzL = 150 µHC = 470 µF
ΔVo = mV

Answer key

  1. 1. D = 0.8
  2. 2. D = 0.75
  3. 3. IL = 25.6 A
  4. 4. ΔIL = 3.529 A
  5. 5. Io,min = 1.795 A
  6. 6. ΔVo = 0.3989 mV

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