All Forums  Projects/Inventions  Computers/Electronics  Reverse recovery of a diode

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by wasssup1990[/i] [br]For anyone interested, I made a simple boost converter that boosts 14V up to 60V to power a 100W light bulb. The reason why I am posting this is to show what the reverse recovery time (trr) of a silicon diode looks like on a DSO. I used a FR304 (Fast Recovery Diode) found in a modern SMPS from a kitchen refrigerator. Channel 1 (yellow trace) is the [red]ripple[/red] voltage across the output capacitor. Channel 2 (blue trace) is the positive going edge of the gate voltage on a RFP50N06 MOSFET. You can see as the MOSFET tries to turn on the diode needs roughly 152nS to be able to block the change in polarity across it. [b]Download Attachment:[/b] [url="./uploaded/wasssup1990/2010925233156_fr304_trr.png"][img]./icon_paperclip.gif[/img] fr304_trr.png[/url][br]9.28 KB [img]./uploaded/wasssup1990/2010925233156_fr304_trr.png[/img] deltaX is the time period between the two cursor positions. deltaX is shown to be 152nS which is almost spot on with what the data sheet says. [b]Download Attachment:[/b] [url="./uploaded/wasssup1990/201092523365_FR304_DSheet.png"][img]./icon_paperclip.gif[/img] FR304_DSheet.png[/url][br]60.03 KB [img]./uploaded/wasssup1990/201092523365_FR304_DSheet.png[/img] [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.