{"id":1503,"date":"2017-11-14T23:48:58","date_gmt":"2017-11-14T23:48:58","guid":{"rendered":"http:\/\/bryceautomation.com\/?p=1503"},"modified":"2017-11-15T01:24:25","modified_gmt":"2017-11-15T01:24:25","slug":"mosfet","status":"publish","type":"post","link":"https:\/\/bryceautomation.com\/index.php\/2017\/11\/14\/mosfet\/","title":{"rendered":"MOSFET"},"content":{"rendered":"<h2>Introduction to the MOSFET<\/h2>\n<p>A MOSFET is a Metal Oxide Semiconductor Field Effect Transistor.\u00a0 \u00a0That might sound intimidating, but basically, a MOSFET is a switch.\u00a0 There are two types of MOSFETS:\u00a0 Enhancement mode, and depletion mode.\u00a0 \u00a0Unquestionably, the most common type of FET is the Enhancement mode.\u00a0 \u00a0 We will discuss this type of FET in this document.<\/p><div id=\"bryce-575366691\" class=\"bryce-afterfirst bryce-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8316758073402323\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-8316758073402323\" \ndata-ad-slot=\"7728240895\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>\n<p>It&#8217;s important to realize that a MOSFET is a voltage controlled device.\u00a0 In contrast, a BJT transistor is a current controlled device.<\/p>\n<p>It&#8217;s also equally important that you know a MOSFET has a gate capacitance.\u00a0 \u00a0The gate capacitance will hold the MOSFET on unless you sink the gate to ground in an NPN device.<\/p>\n<p>Let&#8217;s look at the following diagram I made with <a href=\"http:\/\/www.tinkercad.com\">Tinkercad<\/a>!<\/p>\n<h2>Turning on the MOSFET<\/h2>\n<p>This circuit is for the purpose of this demonstration only.\u00a0 If both switches are on at the same time, you would have a short circuit, but we will only be turning on one of them at a time for this demonstration.<\/p>\n<p>Notice that on the brreadboard, we have two switches.\u00a0 \u00a0The switch on the left will put a + voltage on the gate, while the switch on the right will put GND to the gate.\u00a0 \u00a0When either switch is in the left position, it is on.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-1504 lazyload\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/MOSFETHELDHIGHT.png\" alt=\"MOSFET held high\" width=\"656\" height=\"305\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/MOSFETHELDHIGHT.png 656w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/MOSFETHELDHIGHT-300x139.png 300w\" data-sizes=\"(max-width: 656px) 100vw, 656px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 656px; --smush-placeholder-aspect-ratio: 656\/305;\" \/><\/p>\n<p>Here you can see that we are applying 5v to the base of the FET(5v switch is on).\u00a0 \u00a0Pin 1 is the base, Pin 2 is the drain, and pin 3 is the source.\u00a0 \u00a0 The MOSFET has a very high gate impedance.\u00a0 \u00a0This means that it takes practically no current to hold the gate high.\u00a0 \u00a0In fact, the only current that really flows is for a short time due to the capacitance of the gate.\u00a0 \u00a0The motor is clearly energized with no current flowing into the gate.\u00a0 It&#8217;s important to realize this is a logic level FET.\u00a0 \u00a0This means we can turn it on with 5v or less.\u00a0 \u00a0Different types of semiconductors have different thresholds, so check the datasheet for the MOSFET that you are using.<\/p>\n<h2>Partial conduction<\/h2>\n<p>It&#8217;s also important to realize there is a small region of voltage where the semiconductor can partially conduct.\u00a0 \u00a0Although this can be good in some applications, you have to be very careful with heat dissipation.<\/p>\n<h2>Floating Gate<\/h2>\n<p>Be careful with MOSFETS!\u00a0 \u00a0Notice what happens when I shut the switch off.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-1505 lazyload\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/mosfetstillon.png\" alt=\"MOSFET still on\" width=\"655\" height=\"308\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/mosfetstillon.png 655w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/mosfetstillon-300x141.png 300w\" data-sizes=\"(max-width: 655px) 100vw, 655px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 655px; --smush-placeholder-aspect-ratio: 655\/308;\" \/><\/p>\n<p>Nothing is currently connected to the gate, so the gate is &#8220;floating&#8221;.\u00a0 \u00a0Due to the capacitance of the gate, the Field Effect Transistor remains in the ON state.\u00a0 \u00a0 If you wish to control the FET with a single switch, it&#8217;s a good idea to place a resistor across the gate and source.\u00a0 \u00a0 In my projects, I usually use a 3034 MOSFET, and will place a 15K resistor between the gate and source to prevent the gate from floating.<\/p>\n<h2>Turning the MOSFET off<\/h2>\n<p>If I place ground potential on the gate, the MOSFET will no longer conduct, and the motor will shut off.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-1506 lazyload\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/MOSFEToff.png\" alt=\"MOSFET off\" width=\"666\" height=\"303\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/MOSFEToff.png 666w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/MOSFEToff-300x136.png 300w\" data-sizes=\"(max-width: 666px) 100vw, 666px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 666px; --smush-placeholder-aspect-ratio: 666\/303;\" \/><\/p>\n<p>Because there is no current to the base, and a logic level MOSFET can conduct a large amount of current, the FET is ideal for switching large loads using microcontrollers.\u00a0 It&#8217;s not a bad idea to place a current limiting resistor on the gate, however to limit the inrush current when the gate capacitance is charging.<\/p>\n<p>One challenge of FETS is also heat dissipation.\u00a0 \u00a0By looking at the datasheet, you can find the Rds (Resistance drain to source).\u00a0 Also look at the heat generated in degrees celsius\/watt.\u00a0 \u00a0 Another thing to keep in mind is the maximum junction temperature on the datasheet.\u00a0 \u00a0 With all of that information, you can determine if a heat sink is required.\u00a0 \u00a0 Calculate the power by Rds times current squared.\u00a0 This will give you the power in watts.\u00a0 \u00a0Because you know the degrees per watt, and the maximum junction temperature, you can ensure you are not overheating the semiconductor.<\/p>\n<h2>Final Circuit<\/h2>\n<p>Here is an example of the completed circuit with a single switch.\u00a0 \u00a0When the switch is on, we run + through the 1K resistor, then to the gate.\u00a0 \u00a0 In this configuration, the maximum current draw of the switch can only be 5mA.\u00a0 \u00a0 You will also notice a 15K resistor.\u00a0 \u00a0This &#8220;bleeds&#8221; the gate voltage to ground when the switch is shut off.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-1516 lazyload\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/mosfetfinal-1.png\" alt=\"MOSFET Final\" width=\"938\" height=\"462\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/mosfetfinal-1.png 938w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/mosfetfinal-1-300x148.png 300w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2017\/11\/mosfetfinal-1-768x378.png 768w\" data-sizes=\"(max-width: 938px) 100vw, 938px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 938px; --smush-placeholder-aspect-ratio: 938\/462;\" \/><\/p>\n<p>You will notice a little current flow to the gate this time.\u00a0 \u00a0This is due to the 15K resistor.\u00a0 \u00a0Even though we are effectively wasting 312 MicroAmps when the motor is turned on, the gate is no longer floating.<\/p>\n<p>&#8212;\u00a0 Ricky Bryce<\/p>\n<div id=\"bryce-3799843821\" class=\"bryce-after-content bryce-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8316758073402323\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-8316758073402323\" \ndata-ad-slot=\"4667596182\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Introduction to the MOSFET A MOSFET is a Metal Oxide Semiconductor Field Effect Transistor.\u00a0 \u00a0That might sound intimidating, but basically, a MOSFET is a switch.\u00a0 There are two types of MOSFETS:\u00a0 Enhancement mode, and depletion mode.\u00a0 \u00a0Unquestionably, the most common type of FET is the Enhancement mode.\u00a0 \u00a0 We will discuss this type of FET <a class=\"moretag btn btn-primary\" href=\"https:\/\/bryceautomation.com\/index.php\/2017\/11\/14\/mosfet\/\">Read More \u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":1504,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,8],"tags":[103],"class_list":{"0":"post-1503","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-arduino-other-microprocessors","8":"category-beginner","9":"tag-mosfet","10":"czr-hentry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Using an Enhancement mode MOSFET as a switch for microcontrollers<\/title>\n<meta name=\"description\" content=\"We will discuss how to use a MOSFET as a switch, and other key points such as the floating gate, threshold voltage, and power dissipation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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