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 = 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
2.Easy
+−15 VSLCR−+45 V

An ideal buck-boost converter turns 15 V into 45 V and delivers 3 A to its load. Find the average input current Iin.

Vin​ = 15 VVo​ = 45 VIo = 3 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 24 V into −8 V at 20 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = −8 Vf = 20 kHzL = 100 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 24 V into 14.4 V at 20 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 14.4 Vf = 20 kHzL = 150 µH
ΔIL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 15 V into 10.5 V at 200 kHz with L = 330 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 15 VVo​ = 10.5 Vf = 200 kHzL = 330 µH
Io,min = A
6.Hard
+−36 VSLC = 47 µFR = 4 Ω−+−108 V

An ideal buck-boost converter turns 36 V into −108 V for a 4 Ω load at 200 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = −108 Vf = 200 kHzC = 47 µFR = 4 Ω
ΔVo = mV

Answer key

  1. 1. |Vo| = 84 V
  2. 2. Iin = 9 A
  3. 3. ΔIL = 3 A
  4. 4. ΔIL = 1.92 A
  5. 5. Io,min = 0.02386 A
  6. 6. ΔVo = 2154 mV

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