BLDC motor driver circuit | Forum for Electronics

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It may not display this or other websites correctly.<br />You should upgrade or use an <a href="https://www.google.com/chrome/" target="_blank" rel="noopener">alternative browser</a>.</div> <div class="p-body-header"> <div class="p-title "> <h1 class="p-title-value">BLDC motor driver circuit</h1> </div> <div class="p-description"> <ul class="listInline listInline--bullet"> <li> <i class="fa--xf fal fa-user" aria-hidden="true" title="Thread starter"></i> <span class="u-srOnly">Thread starter</span> <a href="/members/gauravkothari23.564901/" class="username u-concealed" dir="auto" data-user-id="564901" data-xf-init="member-tooltip">gauravkothari23</a> </li> <li> <i class="fa--xf fal fa-clock" aria-hidden="true" title="Start date"></i> <span class="u-srOnly">Start date</span> <a href="/threads/bldc-motor-driver-circuit.413108/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-11-22T13:02:43+0000" data-time="1732280563" data-date-string="Nov 22, 2024" data-time-string="1:02 PM" title="Nov 22, 2024 at 1:02 PM">Nov 22, 2024</time></a> </li> </ul> </div> </div> <div class="p-body-main p-body-main--withSidebar "> <div class="p-body-contentCol"></div> <div class="p-body-sidebarCol"></div> <div class="p-body-content">  <div id='div-gpt-eda_wallpaper'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-eda_wallpaper'); }); </script> </div> <div class="p-body-pageContent"> <div class="block block--messages " data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-413108"> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container"> <div class="block-body"> <article class="message message--post js-post js-inlineModContainer " data-author="gauravkothari23" data-content="post-1784370" id="js-post-1784370" > <span class="u-anchorTarget" id="post-1784370"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/bldc-motor-driver-circuit.413108/post-1784370" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-11-22T13:02:43+0000" data-time="1732280563" data-date-string="Nov 22, 2024" data-time-string="1:02 PM" title="Nov 22, 2024 at 1:02 PM">Nov 22, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/bldc-motor-driver-circuit.413108/post-1784370" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784370/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/bldc-motor-driver-circuit.413108/post-1784370" rel="nofollow"> #1 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/gauravkothari23.564901/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="564901" data-xf-init="member-tooltip" style="background-color: #cc3333; color: #f0c2c2"> <span class="avatar-u564901-m" role="img" aria-label="gauravkothari23">G</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/gauravkothari23.564901/" class="username " dir="auto" data-user-id="564901" data-xf-init="member-tooltip">gauravkothari23</a></h4> <h5 class="userTitle message-userTitle" dir="auto">Advanced Member level 2</h5> </div> <img src="/styles/images/ranks/glevel2.gif" alt="Advanced Member level 2"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Mar 21, 2015</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>644</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>5</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/gauravkothari23.564901" class="fauxBlockLink-linkRow u-concealed">10</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>4</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1,298</dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 6,951 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784370" data-lb-caption-desc="gauravkothari23 · Nov 22, 2024 at 1:02 PM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">Hi all, <br /> I want to drive 24V 2A BLDC motor using Nuvoton MS51FB9AE 8051 controller. <br /> But i am bit confused with the circuit diagram. After going through some of the articles provided online some circuit shows N channel mosfet on High Side and same N Channel mosfet on Low side also. and some shows P channel mosfet on High side and N Channel mosfet on Low Side. <br /> Can anyone please suggest me what type of mosfets can be used. and if both type can be used what would be the driving difference between this two circuits.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/bldc-motor-driver-circuit.413108/reply?quote=1784370" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784370/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" 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data-content="post-1784406" id="js-post-1784406" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1784406/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/bldc-motor-driver-circuit.413108/" /> <span class="u-anchorTarget" id="post-1784406"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/bldc-motor-driver-circuit.413108/post-1784406" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-22T19:44:48+0000" data-time="1732304688" data-date-string="Nov 22, 2024" data-time-string="7:44 PM" title="Nov 22, 2024 at 7:44 PM" itemprop="datePublished">Nov 22, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/bldc-motor-driver-circuit.413108/post-1784406" 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class="bbWrapper">In practical terms a low RdsOn Nch can be made slightly lower than Pch for the same die size and cost so is preferred. A boost cap and diode relies on the low side PWM and top side for direction control.<br /> <br /> Complementary P/N also works.<br /> <br /> The critical parameters should be the RdsOn*C and load regulation effects. They tend to be tradeoffs but some are better than others and varies widely with material SiO2, GaN, S</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/bldc-motor-driver-circuit.413108/reply?quote=1784406" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784406/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1784406"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="gauravkothari23" data-content="post-1784428" id="js-post-1784428" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1784428/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/bldc-motor-driver-circuit.413108/" /> <span class="u-anchorTarget" id="post-1784428"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/bldc-motor-driver-circuit.413108/post-1784428" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-23T04:30:02+0000" data-time="1732336202" data-date-string="Nov 23, 2024" data-time-string="4:30 AM" title="Nov 23, 2024 at 4:30 AM" itemprop="datePublished">Nov 23, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/bldc-motor-driver-circuit.413108/post-1784428" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784428/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/bldc-motor-driver-circuit.413108/post-1784428" rel="nofollow"> #3 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/gauravkothari23.564901/"> <meta itemprop="url" content="https://www.edaboard.com/members/gauravkothari23.564901/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/gauravkothari23.564901/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="564901" data-xf-init="member-tooltip" style="background-color: #cc3333; 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A boost cap and diode relies on the low side PWM and top side for direction control.<br /> <br /> Complementary P/N also works.<br /> <br /> The critical parameters should be the RdsOn*C and load regulation effects. They tend to be tradeoffs but some are better than others and varies widely with material SiO2, GaN, S </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>Will try using Complementary P/N type FDS4559 Mosfet as per your suggestions<br /> for gate driving can use NPN transistors for both N channel and P channel Mosfet. Will use P Channel for PWM speed control and N channel for Direction Control.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/bldc-motor-driver-circuit.413108/reply?quote=1784428" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784428/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1784428"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="gavinray" data-content="post-1785765" id="js-post-1785765" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1785765/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/bldc-motor-driver-circuit.413108/" /> <span class="u-anchorTarget" id="post-1785765"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/bldc-motor-driver-circuit.413108/post-1785765" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-12-16T06:51:05+0000" data-time="1734331865" data-date-string="Dec 16, 2024" data-time-string="6:51 AM" title="Dec 16, 2024 at 6:51 AM" itemprop="datePublished">Dec 16, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/bldc-motor-driver-circuit.413108/post-1785765" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1785765/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/bldc-motor-driver-circuit.413108/post-1785765" rel="nofollow"> #4 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/gavinray.671007/"> <meta itemprop="url" content="https://www.edaboard.com/members/gavinray.671007/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/gavinray.671007/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="671007" data-xf-init="member-tooltip" style="background-color: #2966a3; color: #99bfe6"> <span class="avatar-u671007-m" role="img" aria-label="gavinray">G</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/gavinray.671007/" class="username " dir="auto" data-user-id="671007" data-xf-init="member-tooltip"><span itemprop="name">gavinray</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Member level 1</h5> </div> <img src="/styles/images/ranks/dlevel1.gif" alt="Member level 1"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Sep 27, 2022</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>41</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>1</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/gavinray.671007" class="fauxBlockLink-linkRow u-concealed">2</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>7</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>8</dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 913 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1785765" data-lb-caption-desc="gavinray · Dec 16, 2024 at 6:51 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 564901" data-quote="gauravkothari23" data-source="post: 1784370" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1784370" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1784370">gauravkothari23 said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Hi all,<br /> I want to drive 24V 2A BLDC motor using Nuvoton MS51FB9AE 8051 controller.<br /> But i am bit confused with the circuit diagram. After going through some of the articles provided online some circuit shows N channel mosfet on High Side and same N Channel mosfet on Low side also. and some shows P channel mosfet on High side and N Channel mosfet on Low Side.<br /> Can anyone please suggest me what type of mosfets can be used. and if both type can be used what would be the driving difference between this two circuits. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>For driving a 24V 2A BLDC motor with a Nuvoton MS51FB9AE 8051 controller, you can use both types of MOSFET configurations (N-channel on both high and low side, or P-channel on the high side and N-channel on the low side), but there are key differences in how they are driven:<br /> <br /> <ol> <li data-xf-list-type="ol"><b>N-Channel MOSFETs on High and Low Side:</b><ul> <li data-xf-list-type="ul"><b>Driving complexity:</b> This requires a <b>high-side driver</b> to properly switch the N-channel MOSFET on the high side, because the gate voltage needs to be higher than the source voltage to turn it on.</li> <li data-xf-list-type="ul"><b>Advantages:</b> N-channel MOSFETs generally have better performance (lower Rds(on), higher current capability) than P-channel MOSFETs.</li> </ul></li> <li data-xf-list-type="ol"><b>P-Channel MOSFET on High Side, N-Channel on Low Side:</b><ul> <li data-xf-list-type="ul"><b>Simpler driving:</b> P-channel MOSFETs are easier to drive on the high side, as they turn on when the gate is pulled low (relative to the source). N-channel MOSFETs can be used on the low side directly with the gate driven by the controller.</li> <li data-xf-list-type="ul"><b>Disadvantages:</b> P-channel MOSFETs usually have higher Rds(on) and worse performance than N-channel MOSFETs.</li> </ul></li> </ol><h3>Driving Difference:</h3><ul> <li data-xf-list-type="ul"><b>N-channel on both sides</b> needs additional circuitry like <b>bootstrapping</b> or <b>dedicated high-side drivers</b>.</li> <li data-xf-list-type="ul"><b>P-channel on high side</b> simplifies the gate drive but sacrifices performance compared to N-channel MOSFETs.</li> </ul>If you want efficiency and better control, go with <b>N-channel MOSFETs on both sides</b>, using appropriate high-side driver circuits.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/bldc-motor-driver-circuit.413108/reply?quote=1785765" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1785765/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList is-active"> <ul class="reactionSummary"> <li><span class="reaction reaction--small reaction--1" data-reaction-id="1"><i aria-hidden="true"></i><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="reaction-sprite js-reaction" alt="Like" title="Like" /></span></li> </ul> <span class="u-srOnly">Reactions:</span> <a class="reactionsBar-link" href="/posts/1785765/reactions" data-xf-click="overlay" data-cache="false" rel="nofollow"><bdi>naania</bdi> and <bdi>gauravkothari23</bdi></a> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1785765"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="naania" data-content="post-1786386" id="js-post-1786386" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1786386/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/bldc-motor-driver-circuit.413108/" /> <span class="u-anchorTarget" id="post-1786386"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/bldc-motor-driver-circuit.413108/post-1786386" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-12-31T06:50:36+0000" data-time="1735627836" data-date-string="Dec 31, 2024" data-time-string="6:50 AM" title="Dec 31, 2024 at 6:50 AM" itemprop="datePublished">Dec 31, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/bldc-motor-driver-circuit.413108/post-1786386" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1786386/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/bldc-motor-driver-circuit.413108/post-1786386" rel="nofollow"> #5 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/naania.692567/"> <meta itemprop="url" content="https://www.edaboard.com/members/naania.692567/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/naania.692567/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="692567" data-xf-init="member-tooltip" style="background-color: #cc5233; color: #3d180f"> <span class="avatar-u692567-m" role="img" aria-label="naania">N</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/naania.692567/" class="username " dir="auto" data-user-id="692567" data-xf-init="member-tooltip"><span itemprop="name">naania</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Newbie</h5> </div> <img src="/styles/images/ranks/alevel1.gif" alt="Newbie level 1"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Dec 27, 2024</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>1</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>0</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/naania.692567" class="fauxBlockLink-linkRow u-concealed">0</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>0</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1</dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 5 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1786386" data-lb-caption-desc="naania · Dec 31, 2024 at 6:50 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 671007" data-quote="gavinray" data-source="post: 1785765" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1785765" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1785765">gavinray said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> For driving a 24V 2A BLDC motor with a Nuvoton MS51FB9AE 8051 controller, you can use both types of MOSFET configurations (N-channel on both high and low side, or P-channel on the high side and N-channel on the low side), but there are key differences in how they are driven:<br /> <br /> <ol> <li data-xf-list-type="ol"><b>N-Channel MOSFETs on High and Low Side:</b><ul> <li data-xf-list-type="ul"><b>Driving complexity:</b> This requires a <b>high-side driver</b> to properly switch the N-channel MOSFET on the high side, because the gate voltage needs to be higher than the source voltage to turn it on.</li> <li data-xf-list-type="ul"><b>Advantages:</b> N-channel MOSFETs generally have better performance (lower Rds(on), higher current capability) than P-channel MOSFETs.</li> </ul></li> <li data-xf-list-type="ol"><b>P-Channel MOSFET on High Side, N-Channel on Low Side:</b><ul> <li data-xf-list-type="ul"><b>Simpler driving:</b> P-channel MOSFETs are easier to drive on the high side, as they turn on when the gate is pulled low (relative to the source). N-channel MOSFETs can be used on the low side directly with the gate driven by the controller.</li> <li data-xf-list-type="ul"><b>Disadvantages:</b> P-channel MOSFETs usually have higher Rds(on) and worse performance than N-channel MOSFETs.</li> </ul></li> </ol><h3>Driving Difference:</h3><ul> <li data-xf-list-type="ul"><b>N-channel on both sides</b> needs additional circuitry like <b>bootstrapping</b> or <b>dedicated high-side drivers</b>.</li> <li data-xf-list-type="ul"><b>P-channel on high side</b> simplifies the gate drive but sacrifices performance compared to N-channel MOSFETs.</li> </ul>If you want efficiency and better control, go with <b>N-channel MOSFETs on both sides</b>, using appropriate high-side driver circuits.<br /> [Spam deleted] </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>really useful for me, tks a lot</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited by a moderator: <time class="u-dt" dir="auto" datetime="2024-12-31T08:37:18+0000" data-time="1735634238" data-date-string="Dec 31, 2024" data-time-string="8:37 AM" title="Dec 31, 2024 at 8:37 AM" itemprop="dateModified">Dec 31, 2024</time> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/bldc-motor-driver-circuit.413108/reply?quote=1786386" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1786386/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> 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Are you sure you want to submit this form?", attach: "Attach files", rich_text_box: "Rich text box", close: "Close", link_copied_to_clipboard: "Link copied to clipboard.", text_copied_to_clipboard: "Text copied to clipboard.", loading: "Loading…", you_have_exceeded_maximum_number_of_selectable_items: "You have exceeded the maximum number of selectable items.", processing: "Processing", 'processing...': "Processing…", showing_x_of_y_items: "Showing {count} of {total} items", showing_all_items: "Showing all items", no_items_to_display: "No items to display", number_button_up: "Increase", number_button_down: "Decrease", push_enable_notification_title: "Push notifications enabled successfully at Forum for Electronics", push_enable_notification_body: "Thank you for enabling push notifications!", pull_down_to_refresh: "Pull down to refresh", release_to_refresh: "Release to refresh", refreshing: "Refreshing…" , "svStandardLib_time.day": "{count} day", "svStandardLib_time.days": "{count} days", "svStandardLib_time.hour": "{count} hour", "svStandardLib_time.hours": "{count} hours", "svStandardLib_time.minute": "{count} minutes", "svStandardLib_time.minutes": "{count} minutes", "svStandardLib_time.month": "{count} month", "svStandardLib_time.months": "{count} months", "svStandardLib_time.second": "{count} second", "svStandardLib_time.seconds": "{count} seconds", "svStandardLib_time.week": "time.week", "svStandardLib_time.weeks": "{count} weeks", "svStandardLib_time.year": "{count} year", "svStandardLib_time.years": "{count} years" }); </script> <form style="display:none" hidden="hidden"> <input type="text" name="_xfClientLoadTime" value="" id="_xfClientLoadTime" title="_xfClientLoadTime" tabindex="-1" /> </form>  <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "QAPage", "url": "https://www.edaboard.com/threads/bldc-motor-driver-circuit.413108/", "mainEntity": { "@type": "Question", "@id": "https://www.edaboard.com/threads/bldc-motor-driver-circuit.413108/", "name": "BLDC motor driver circuit", "datePublished": "2024-11-22T13:02:43+00:00", "url": "https://www.edaboard.com/threads/bldc-motor-driver-circuit.413108/", "text": "Hi all, \nI want to drive 24V 2A BLDC motor using Nuvoton MS51FB9AE 8051 controller. \nBut i am bit confused with the circuit diagram. After going through some of the articles provided online some circuit shows N channel mosfet on High Side and same N Channel mosfet on Low side also. and some shows P channel mosfet on High side and N Channel mosfet on Low Side. \nCan anyone please suggest me what type of mosfets can be used. and if both type can be used what would be the driving difference between this two circuits.", "answerCount": 4, "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/gauravkothari23.564901/", "name": "gauravkothari23", "url": "https://www.edaboard.com/members/gauravkothari23.564901/" }, "suggestedAnswer": [ { "@type": "Answer", "datePublished": "2024-12-31T06:50:36+00:00", "dateModified": "2024-12-31T08:37:18+00:00", "url": "https://www.edaboard.com/posts/1786386/", "text": "For driving a 24V 2A BLDC motor with a Nuvoton MS51FB9AE 8051 controller, you can use both types of MOSFET configurations (N-channel on both high and low side, or P-channel on the high side and N-channel on the low side), but there are key differences in how they are driven:\n\n\nN-Channel MOSFETs on High and Low Side:\n\nDriving complexity: This requires a high-side driver to properly switch the N-channel MOSFET on the high side, because the gate voltage needs to be higher than the source voltage to turn it on.\nAdvantages: N-channel MOSFETs generally have better performance (lower Rds(on), higher current capability) than P-channel MOSFETs.\n\nP-Channel MOSFET on High Side, N-Channel on Low Side:\n\nSimpler driving: P-channel MOSFETs are easier to drive on the high side, as they turn on when the gate is pulled low (relative to the source). N-channel MOSFETs can be used on the low side directly with the gate driven by the controller.\nDisadvantages: P-channel MOSFETs usually have higher Rds(on) and worse performance than N-channel MOSFETs.\n\n\nDriving Difference:\n\nN-channel on both sides needs additional circuitry like bootstrapping or dedicated high-side drivers.\nP-channel on high side simplifies the gate drive but sacrifices performance compared to N-channel MOSFETs.\n\nIf you want efficiency and better control, go with N-channel MOSFETs on both sides, using appropriate high-side driver circuits.\n[Spam deleted]\n\nreally useful for me, tks a lot", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/naania.692567/", "name": "naania", "url": "https://www.edaboard.com/members/naania.692567/" } }, { "@type": "Answer", "datePublished": "2024-12-16T06:51:05+00:00", "url": "https://www.edaboard.com/posts/1785765/", "text": "Hi all,\nI want to drive 24V 2A BLDC motor using Nuvoton MS51FB9AE 8051 controller.\nBut i am bit confused with the circuit diagram. After going through some of the articles provided online some circuit shows N channel mosfet on High Side and same N Channel mosfet on Low side also. and some shows P channel mosfet on High side and N Channel mosfet on Low Side.\nCan anyone please suggest me what type of mosfets can be used. and if both type can be used what would be the driving difference between this two circuits.\n\nFor driving a 24V 2A BLDC motor with a Nuvoton MS51FB9AE 8051 controller, you can use both types of MOSFET configurations (N-channel on both high and low side, or P-channel on the high side and N-channel on the low side), but there are key differences in how they are driven:\n\n\nN-Channel MOSFETs on High and Low Side:\n\nDriving complexity: This requires a high-side driver to properly switch the N-channel MOSFET on the high side, because the gate voltage needs to be higher than the source voltage to turn it on.\nAdvantages: N-channel MOSFETs generally have better performance (lower Rds(on), higher current capability) than P-channel MOSFETs.\n\nP-Channel MOSFET on High Side, N-Channel on Low Side:\n\nSimpler driving: P-channel MOSFETs are easier to drive on the high side, as they turn on when the gate is pulled low (relative to the source). N-channel MOSFETs can be used on the low side directly with the gate driven by the controller.\nDisadvantages: P-channel MOSFETs usually have higher Rds(on) and worse performance than N-channel MOSFETs.\n\n\nDriving Difference:\n\nN-channel on both sides needs additional circuitry like bootstrapping or dedicated high-side drivers.\nP-channel on high side simplifies the gate drive but sacrifices performance compared to N-channel MOSFETs.\n\nIf you want efficiency and better control, go with N-channel MOSFETs on both sides, using appropriate high-side driver circuits.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/gavinray.671007/", "name": "gavinray", "url": "https://www.edaboard.com/members/gavinray.671007/" } }, { "@type": "Answer", "datePublished": "2024-11-23T04:30:02+00:00", "url": "https://www.edaboard.com/posts/1784428/", "text": "In practical terms a low RdsOn Nch can be made slightly lower than Pch for the same die size and cost so is preferred. A boost cap and diode relies on the low side PWM and top side for direction control.\n\nComplementary P/N also works.\n\nThe critical parameters should be the RdsOn*C and load regulation effects. They tend to be tradeoffs but some are better than others and varies widely with material SiO2, GaN, S\n\nWill try using Complementary P/N type FDS4559 Mosfet as per your suggestions\nfor gate driving can use NPN transistors for both N channel and P channel Mosfet. Will use P Channel for PWM speed control and N channel for Direction Control.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/gauravkothari23.564901/", "name": "gauravkothari23", "url": "https://www.edaboard.com/members/gauravkothari23.564901/" } } ] }, "publisher": { "@type": "Organization", "name": "Forum for Electronics", "description": "International Electronics Discussion Forum: EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals", "url": "https://www.edaboard.com" } } </script> <script> $(function(){ var notice = $('.xb-welcome-notice'); if(notice.length){ var cookie = XF.Cookie.get('hide_welcome_notice'); if(!cookie){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else if ((Date.now() - cookie) > 8.64e+7){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else { notice.hide(); } } }); </script> </div> </body> </html>

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