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
+−24 VLSCR+−60 V

An ideal boost converter turns 24 V into 60 V and delivers 2 A to its load. Find the average input current Iin.

Vin​ = 24 VVo​ = 60 VIo = 2 A
Iin = A
2.Easy
+−12 VD = 0.4LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 12 V with a duty cycle D = 0.4 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 12 VD = 0.4
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 28.8 V at 20 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 28.8 Vf = 20 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 40 V at 200 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 40 Vf = 200 kHzL = 22 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 36 V into 9 V for a 2 Ω load at 200 kHz, with L = 22 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 9 Vf = 200 kHzL = 22 µHC = 220 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 48 V into −32 V for a 12 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = −32 Vf = 20 kHzR = 12 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 5 A
  2. 2. |Vo| = 8 V
  3. 3. ΔIL = 2.618 A
  4. 4. ΔIL = 2.182 A
  5. 5. ΔVo = 4.358 mV
  6. 6. Lcrit = 108 µH

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