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
+−36 VD = ?LCR−+36 V

An ideal inverting buck-boost converter must produce −36 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = −36 V
D =
2.Easy
+−15 VD = 0.5LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 15 V with a duty cycle D = 0.5 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 15 VD = 0.5
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 9 V into 36 V at 200 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 36 Vf = 200 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 9 V into −6 V at 50 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = −6 Vf = 50 kHzL = 47 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 24 V into 12 V for a 4 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 12 Vf = 250 kHzR = 4 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 48 V into −32 V for a 20 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = −32 Vf = 100 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.5
  2. 2. |Vo| = 15 V
  3. 3. ΔIL = 0.1534 A
  4. 4. ΔIL = 1.532 A
  5. 5. Lcrit = 4 µH
  6. 6. Lcrit = 36 µH

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