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
+−12 VSLCR+−7.2 V

An ideal buck converter turns 12 V into 7.2 V and delivers 2 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 7.2 VIo = 2 A
Iin = A
2.Easy
+−36 VD = 0.7LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 36 V with a duty cycle D = 0.7 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 36 VD = 0.7
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 5.4 V at 200 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 5.4 Vf = 200 kHzL = 68 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 24 V into 18 V for a 10 Ω load. It switches at 500 kHz with L = 68 µH. Find the peak inductor current Imax.

Vin​ = 24 VVo​ = 18 Vf = 500 kHzL = 68 µHR = 10 Ω
Imax = A
5.Hard
+−24 VLSC = 22 µFR = 4 Ω+−60 V

An ideal boost converter turns 24 V into 60 V for a 4 Ω load at 50 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 60 Vf = 50 kHzC = 22 µFR = 4 Ω
ΔVo = mV
6.Hard
+−12 VSLC = 47 µFR = 25 Ω−+−28 V

An ideal buck-boost converter turns 12 V into −28 V for a 25 Ω load at 50 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = −28 Vf = 50 kHzC = 47 µFR = 25 Ω
ΔVo = mV

Answer key

  1. 1. Iin = 1.2 A
  2. 2. |Vo| = 84 V
  3. 3. ΔIL = 0.1588 A
  4. 4. Imax = 1.866 A
  5. 5. ΔVo = 8182 mV
  6. 6. ΔVo = 333.6 mV

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