Lateral MOSFET, How do I calculate power output
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Solid State Talk all about solid state amplification.

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 16th December 2007, 07:55 AM #1 synonymous   diyAudio Member   Join Date: Oct 2007 Lateral MOSFET, How do I calculate power output Hello's Wondering if I can gain some insight on either rules of thumb calculations or if there are some pretty straight forward ways of calculating the power output of Lateral MOSFET based amplifiers. I realize that there are different losses at different load impedances. Typically it is assumed that the power output can be doubled by simply halving the load impedance. This is untrue however, no? I guess my question is.. Based on transformer secondary voltage, what kind of power should I expect to see in the real world at either 8,4 or 2 Ohm? Are these powers affected by more or less paralleled output devices? Typically, is efficiency lost with more output parallels? Appreciate any clarification Scott
 17th December 2007, 11:43 PM #3 unclejed613   diyAudio Member     Join Date: Dec 2006 also, you have a higher bias voltage for MOSFETS, which means your drivers have to swing another 3-10V for full output close to rail-to-rail. this means you actually need a higher rail voltage for at least the VAS and driver stage, so for 100W output, you will want at least +/- 70v for the VAS/drivers. to simplify things, you can make this your output rail voltage as well, but your transistors need to be 150V devices. __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: spammers must die
 17th December 2007, 11:55 PM #4 suzyj   diyAudio Member     Join Date: Jan 2006 Location: Western Australia I go through a bit of a calculation on the webpage describing my lateral MOSFET amp, at http://www.littlefishbicycles.com/poweramp/index.html. I derived a simple formula to give Rth(max) for the heatsink, but you can easily solve for power, given Rth etc. To get the dissipated power, I found the easiest way was just to use LTspice. I designed the amp with LTspice, and simply measured the power dissipation in the output transistors.
 18th December 2007, 06:54 AM #5 synonymous   diyAudio Member   Join Date: Oct 2007 Very nice! Thank You The designs I use are based on Randy Slone's work. I will be using the same Hitachi output devices. I see you are in the process of making an anti-thump circuit. Have you considered a circuit that controls the mains power based on an input signals presence? THX again

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Holton Precision Audio         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post lineup Solid State 86 4th April 2015 03:54 PM lineup Solid State 1 28th August 2008 04:29 PM JBnl Solid State 2 12th March 2005 04:49 PM

 New To Site? Need Help?

All times are GMT. The time now is 03:28 AM.

 Home - Contact Us - Advertise - Rules - diyAudio Store - Sponsors - Privacy Statement - Terms of Service - Top - Opt-out policy

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.