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  • Author Author: tariq.ahmad
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A Noise-Free DIY Switching Power Supply - How Hard Can It Be? -- Episode 542

Switch Mode Power Supplies (SMPS) need a printed circuit board (PCB). To see why check out this video. We look at how hard could it be to get a PCB design right! Hint: You need copper zones to get a low-noise SMPS design.

 

Supplemental Content:

 

Bill of Material:

Product Name Manufacturer Quantity Buy Kit
DC/DC CONV, BUCK/BOOST/INVERT, 85DEG C On-Semi 1 Buy Now
Small Signal Schottky Diode, Single, 45 V, 8 A, 570 mV, 120 A, 150 °C Vishay 1 Buy Now
Power Inductor (SMD), 180 uH, 1.9 A, Shielded, 1.6 A, SRR1210 Series, 12mm x 12mm x 10mm Bourns 1 Buy Now
CAP, 4700uF, 16V, RADIAL, SMD PANASONIC 1 Buy Now
SMD Multilayer Ceramic Capacitor, 0.47 µF, 25 V, 0805 [2012 Metric], ± 10%, X7R, -55 °C SAMSUNG ELECTRO-MECHANICS 1 Buy Now
Surface Mount Thick Film Resistor, CRG Series, 68 kohm, 330 mW, - 5%, 150 V RoHS Compliant: Yes TE CONNECTIVITY 1 Buy Now
SMD Aluminum Electrolytic Capacitor, Radial Can - SMD, 330 µF, 25 V, 0.8 ohm, 2000 hours @ 85°C NIC COMPONENTS 1 Buy Now
 

Additional Parts:

PCBs: Auto-Routed, 6mil no pour, 6mil with ground pour, and Copper Zones

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  • Interesting episode, although designing for failure rubs me the wrong way. I would like to see to see if there is a difference between realistic attempts - I doubt anyone would design with a 6 mil trace meant to carry 4 amps, even though I know it was done just for illustration. It would have been interesting to see differences between heavy traces and poured interconnects. Heavy traces are easier to edit and their impedance can actually be calculated.

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  • Interesting episode, although designing for failure rubs me the wrong way. I would like to see to see if there is a difference between realistic attempts - I doubt anyone would design with a 6 mil trace meant to carry 4 amps, even though I know it was done just for illustration. It would have been interesting to see differences between heavy traces and poured interconnects. Heavy traces are easier to edit and their impedance can actually be calculated.

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