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 VD = 0.75LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.75 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.75
|Vo| = V
2.Easy
+−36 VLD = ?CR+−180 V

An ideal boost converter must produce 180 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 180 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 19.2 V at 500 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 19.2 Vf = 500 kHzL = 100 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 15 V into 9 V at 250 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 9 Vf = 250 kHzL = 47 µH
ΔIL = A
5.Hard
+−15 VLSC = 220 µFR = 5 Ω+−60 V

An ideal boost converter turns 15 V into 60 V for a 5 Ω load at 250 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 60 Vf = 250 kHzC = 220 µFR = 5 Ω
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 9 V into −21 V for a 50 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = −21 Vf = 50 kHzR = 50 Ω
Lcrit = µH

Answer key

  1. 1. |Vo| = 15 V
  2. 2. D = 0.8
  3. 3. ΔIL = 0.2304 A
  4. 4. ΔIL = 0.3064 A
  5. 5. ΔVo = 163.6 mV
  6. 6. Lcrit = 45 µH

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