EEVblog #110 - Let's Design a DC to DC Switchmode Converter

Dave takes you step-by-step through designing a DC-DC converter using the venerable MC34063. And then he builds it and checks the performance.

Category:

Science & Technology

Tags:

• tutorial
• design
• circuit
• dc
• converter
• switchmode
• power
• supply
• calculation
• equation
• theory
• measurement
• build
• efficiency

[leeYT321987]

Hey Dave. I just wanted to say that you are freaking AWESOME! I'm somewhat of a beginner hobbyist. I just cracked open a car charger someone gave me, searched the chip (mc34063), and BAM -- Dave's got a ~40-minute, step-by-step video all about how to design for this chip!!!! So cool you are. You've taught me so much. If you were here, I'd shake your hand. Thank you 1000 times. I love your attitude. You are a pretty cool guy. My love to you and yours. Have a wonderful life!

[EEVblog]

@leeYT321987 Glad you found it helpful, thanks.

[HillOrStream]

In the intro to this clip you refer to another video that I'm having trouble locating. Can you put a link to it in the description for this clip? Thanks.

[EEVblog]

@HillOrStream Annotation and link added to the video. It's #90

[Chimpalimp1001]

I love your shirt so much! I am an electronics newbie, so forgive me if this is a rather lowly question. I noticed that you rounded a lot when choosing your circuit parts. I also understand that inductors are rather large and having too many on a circuit board is inefficiency in space. But for your capacitors, and hell even if you had some bad resistor values, couldn't you add caps in series and resistors in parallel in order to get better values, or is it also inefficient in space?

[EEVblog]

@Chimpalimp1001 Caps and inductors have a large tolerance anyway, it's not that critical.

[cowcrusher]

Where can I get that shirt? haha

[MiShO10O0O]

Dave ,, Please can you help me converting 48 Volts to 12 volts ,, All switching regulator ICs have a maximum of 40 volts operating voltage ! what should I do ?!

[TrollingAround]

1 person wanted to be one in 2^15



[thenerdyouknowabout]

Soz..... That was really easy, thanks save, like you vids, thanks a bunch!!

[thenerdyouknowabout]

That

[Firehowk]

google MC34063 calculator if u are lazy like me ;)

[123456789robbie]

your shirt is the coolest thing i've seen in ages. that is all.

[THEtechknight]

i actually repaired an infocus projector power supply that used the MC34063 for the 400v boost converter PFC circuit. it had failed.

[bcsupport]

To step down Vin to 3.3v, should Vin below 5v work ok ? I try using the online calculators with Vin = 4.5v and Vout = 3.3 but it doesnt seem to work right. Also when I turn down my bench CC/CV below 5.0v, the Vout drops way below 3.3v

[bcsupport]

You should do a tutorial for Step down mode