Is it possible to use IC 555 for all MOSFET switches of power supply? | Electronics Forum (Circuits, Projects and Microcontrollers)

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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">Is it possible to use IC 555 for all MOSFET switches of power supply?</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/electronium.312577/" class="username u-concealed" dir="auto" data-user-id="312577" data-xf-init="member-tooltip">electronium</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/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-04-16T00:44:09-0700" data-time="1713253449" data-date-string="Apr 16, 2024" data-time-string="12:44 AM" title="Apr 16, 2024 at 12:44 AM">Apr 16, 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 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-166033"> <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="electronium" data-content="post-1450558" id="js-post-1450558" > <span class="u-anchorTarget" id="post-1450558"></span> <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/electronium.312577/" class="avatar avatar--m" data-user-id="312577" data-xf-init="member-tooltip"> <img src="/data/avatars/m/312/312577.jpg?1704638518" srcset="/data/avatars/l/312/312577.jpg?1704638518 2x" alt="electronium" class="avatar-u312577-m" width="96" height="96" loading="lazy" /> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/electronium.312577/" class="username " dir="auto" data-user-id="312577" data-xf-init="member-tooltip">electronium</a></h4> <h5 class="userTitle message-userTitle" dir="auto">Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450558" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-04-16T00:44:09-0700" data-time="1713253449" data-date-string="Apr 16, 2024" data-time-string="12:44 AM" title="Apr 16, 2024 at 12:44 AM">Apr 16, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450558" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1450558/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450558" rel="nofollow"> #1 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1450558" data-lb-caption-desc="electronium · Apr 16, 2024 at 12:44 AM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">Greetings to the colleagues of the forum<br /> I have always thought that I can start and use all MOSFETs of switching power supplies with IC 555. Is it possible? Because IC 555 is, as we say, the French Wrench of ICs, can it be used as a module for all power sources that require a MOSFET gate and feedback?</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-04-16T08:49:13-0700" data-time="1713282553" data-date-string="Apr 16, 2024" data-time-string="8:49 AM" title="Apr 16, 2024 at 8:49 AM">Apr 16, 2024</time> </div> </div> <footer class="message-footer"> <div class="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> </div> </div> </div> <div class="block block--messages" data-xf-init="" data-type="post" data-href="/inline-mod/" data-search-target="*"> <span class="u-anchorTarget" id="posts"></span> <div class="block-outer"><div class="block-outer-opposite"> <div class="tabs tabs--standalone tabs--standalone--small tabs--standalone--inline"> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/" class="tabs-tab is-active" rel="nofollow"> Sort by date </a> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/?order=vote_score" class="tabs-tab " rel="nofollow"> Sort by votes </a> </div> </div></div> <div class="block-container lbContainer" data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-166033" data-lb-universal="0"> <div class="block-body js-replyNewMessageContainer"> <article class="message message--post js-post js-inlineModContainer " data-author="danadak" data-content="post-1450571" id="js-post-1450571" itemscope itemtype="https://schema.org/Answer" itemid="https://www.electro-tech-online.com/posts/1450571/"> <meta itemprop="parentItem" itemscope itemid="https://www.electro-tech-online.com/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/" /> <span class="u-anchorTarget" id="post-1450571"></span> <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.electro-tech-online.com/members/danadak.285320/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/danadak.285320/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/danadak.285320/" class="avatar avatar--m" data-user-id="285320" data-xf-init="member-tooltip"> <img src="/data/avatars/m/285/285320.jpg?1644589903" srcset="/data/avatars/l/285/285320.jpg?1644589903 2x" alt="danadak" class="avatar-u285320-m" width="96" height="96" loading="lazy" itemprop="image" /> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/danadak.285320/" class="username " dir="auto" data-user-id="285320" data-xf-init="member-tooltip"><span itemprop="name">danadak</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Well-Known Member</h5> <div class="userBanner userBanner userBanner--gray message-userBanner" itemprop="jobTitle"><span class="userBanner-before"></span><strong>Most Helpful Member</strong><span class="userBanner-after"></span></div> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450571" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-04-16T06:07:32-0700" data-time="1713272852" data-date-string="Apr 16, 2024" data-time-string="6:07 AM" title="Apr 16, 2024 at 6:07 AM" itemprop="datePublished">Apr 16, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450571" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1450571/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450571" rel="nofollow"> #2 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1450571" data-lb-caption-desc="danadak · Apr 16, 2024 at 6:07 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">If you want to properly drive a MOSFET in a switching power supply<br /> a 555 would not be the best of choices. Reason is MOSFET gate C<br /> presents challenges, Trise, Tfall not optimum, so MOSFET spends <br /> more time in active region, heats up.....<br /> <br /> Your ask here is quite vague in its description, can you clarify what<br /> power supplies you are trying to create, their characteristics ?<br /> <br /> <br /> Regards, Dana.</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="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/1450571/reactions" data-xf-click="overlay" data-cache="false" rel="nofollow"><bdi>Fluffyboii</bdi></a> </div> <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-1450571"> <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="schmitt trigger" data-content="post-1450573" id="js-post-1450573" itemscope itemtype="https://schema.org/Answer" itemid="https://www.electro-tech-online.com/posts/1450573/"> <meta itemprop="parentItem" itemscope itemid="https://www.electro-tech-online.com/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/" /> <span class="u-anchorTarget" id="post-1450573"></span> <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.electro-tech-online.com/members/schmitt-trigger.136174/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/schmitt-trigger.136174/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/schmitt-trigger.136174/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="136174" data-xf-init="member-tooltip" style="background-color: #999966; color: #2e2e1f"> <span class="avatar-u136174-m" role="img" aria-label="schmitt trigger">S</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/schmitt-trigger.136174/" class="username " dir="auto" data-user-id="136174" data-xf-init="member-tooltip"><span itemprop="name">schmitt trigger</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Well-Known Member</h5> <div class="userBanner userBanner userBanner--gray message-userBanner" itemprop="jobTitle"><span class="userBanner-before"></span><strong>Most Helpful Member</strong><span class="userBanner-after"></span></div> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450573" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-04-16T06:38:42-0700" data-time="1713274722" data-date-string="Apr 16, 2024" data-time-string="6:38 AM" title="Apr 16, 2024 at 6:38 AM" itemprop="datePublished">Apr 16, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450573" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1450573/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450573" rel="nofollow"> #3 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1450573" data-lb-caption-desc="schmitt trigger · Apr 16, 2024 at 6:38 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Indeed, it appears that the actual meaning of the question is lost in the translation. <br /> <br /> Having said this, I do have seen low cost, low power supplies using a 555. But that was back in the early 1990s. The driven Mosfet was quite small, the frequency only about 25 Khz. Under those circumstances it was an acceptable, but not optimal solution. <br /> Nowadays I don’t think anyone would use a 555. Although it can produce a PWM waveform, the duty cycle range is limited, it doesn’t have an integrated reference, and lacks integrated protection features like UVLO and current sense. Even the ancient SG3524 is better suited than a 555.</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="reactionsBar js-reactionsList "> </div> <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-1450573"> <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" 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data-href="/posts/1450578/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450578" rel="nofollow"> #4 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1450578" data-lb-caption-desc="Nigel Goodwin · Apr 16, 2024 at 7:09 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 136174" data-quote="schmitt trigger" data-source="post: 1450573" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1450573" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1450573">schmitt trigger said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Indeed, it appears that the actual meaning of the question is lost in the translation.<br /> <br /> Having said this, I do have seen low cost, low power supplies using a 555. But that was back in the early 1990s. The driven Mosfet was quite small, the frequency only about 25 Khz. Under those circumstances it was an acceptable, but not optimal solution. <br /> Nowadays I don’t think anyone would use a 555. Although it can produce a PWM waveform, the duty cycle range is limited, it doesn’t have an integrated reference, and lacks integrated protection features like UVLO and current sense. Even the ancient SG3524 is better suited than a 555. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>The 555 was never intended for use in that way, and was always a really bad choice - you would struggle finding anything worse?.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <aside class="message-signature"> <div class="bbWrapper">PIC programmer software, and PIC Tutorials at:<br /> <a href="http://www.winpicprog.co.uk" target="_blank" class="link link--external" rel="noopener">http://www.winpicprog.co.uk</a></div> </aside> </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="reactionsBar js-reactionsList "> </div> <div 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class="message-userDetails"> <h4 class="message-name"><a href="/members/electronium.312577/" class="username " dir="auto" data-user-id="312577" data-xf-init="member-tooltip"><span itemprop="name">electronium</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450586" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-04-16T08:54:45-0700" data-time="1713282885" data-date-string="Apr 16, 2024" data-time-string="8:54 AM" title="Apr 16, 2024 at 8:54 AM" itemprop="datePublished">Apr 16, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450586" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1450586/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450586" rel="nofollow"> #5 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1450586" data-lb-caption-desc="electronium · Apr 16, 2024 at 8:54 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">The point of view is that most of the time the power IC and the MOSFET starter IC burn in the power supply and there is no trace of it until it is diagnosed. pcb so that we can use it for all switching power circuits that have pwm by changing the potentiometer, however, if you know a circuit, let me know so that I can do this in the best way.</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="reactionsBar js-reactionsList "> </div> <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-1450586"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote 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class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450603" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-04-16T14:12:07-0700" data-time="1713301927" data-date-string="Apr 16, 2024" data-time-string="2:12 PM" title="Apr 16, 2024 at 2:12 PM" itemprop="datePublished">Apr 16, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450603" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1450603/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450603" rel="nofollow"> #6 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1450603" data-lb-caption-desc="eTech · Apr 16, 2024 at 2:12 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 312577" data-quote="electronium" data-source="post: 1450558" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1450558" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1450558">electronium said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Greetings to the colleagues of the forum<br /> I have always thought that I can start and use all MOSFETs of switching power supplies with IC 555. Is it possible? Because IC 555 is, as we say, the French Wrench of ICs, can it be used as a module for all power sources that require a MOSFET gate and feedback? </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote><br /> No.</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="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" 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href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450636" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-04-17T09:05:16-0700" data-time="1713369916" data-date-string="Apr 17, 2024" data-time-string="9:05 AM" title="Apr 17, 2024 at 9:05 AM" itemprop="datePublished">Apr 17, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450636" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1450636/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1450636" rel="nofollow"> #7 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1450636" data-lb-caption-desc="crutschow · Apr 17, 2024 at 9:05 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 312577" data-quote="electronium" data-source="post: 1450558" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1450558" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1450558">electronium said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Because IC 555 is, as we say, the French Wrench of ICs </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>It may be for timing circuits but, as noted, it's ill suited to PWM switcher power supply applications.<br /> A dedicated switching power supply IC is best for that purpose.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <aside class="message-signature"> <div class="bbWrapper">Zapper<br /> Curmudgeon Elektroniker<br /> --The important thing about having knowledge is knowing where it correctly applies..--</div> </aside> </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="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" 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href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1451055" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-04-30T14:54:40-0700" data-time="1714514080" data-date-string="Apr 30, 2024" data-time-string="2:54 PM" title="Apr 30, 2024 at 2:54 PM" itemprop="datePublished">Apr 30, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1451055" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1451055/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/is-it-possible-to-use-ic-555-for-all-mosfet-switches-of-power-supply.166033/post-1451055" rel="nofollow"> #8 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1451055" data-lb-caption-desc="Papabravo · Apr 30, 2024 at 2:54 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">To put a finer point on the matter. The chip depends on a voltage divider and capacitor to determine the switching frequency and duty cycle. It is difficult for the switching frequency to be selected from a suitable range. The duty cycle adjustment over the charging and discharging curves is hardly linear. In addition, there is no error amplifier to adjust the duty cycle and there are no provisions for loop or slope compensation. In short it would be just about the worst possible choice for building any kind of SMPS.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <aside class="message-signature"> <div class="bbWrapper">We never have time to do it right; but we always have time to do it over.</div> </aside> </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="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 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Is it possible? Because IC 555 is, as we say, the French Wrench of ICs, can it be used as a module for all power sources that require a MOSFET gate and feedback?", "answerCount": 7, "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/electronium.312577/", "name": "electronium", "url": "https://www.electro-tech-online.com/members/electronium.312577/" }, "suggestedAnswer": [ { "@type": "Answer", "datePublished": "2024-04-30T21:54:40+00:00", "url": "https://www.electro-tech-online.com/posts/1451055/", "text": "To put a finer point on the matter. The chip depends on a voltage divider and capacitor to determine the switching frequency and duty cycle. It is difficult for the switching frequency to be selected from a suitable range. The duty cycle adjustment over the charging and discharging curves is hardly linear. In addition, there is no error amplifier to adjust the duty cycle and there are no provisions for loop or slope compensation. In short it would be just about the worst possible choice for building any kind of SMPS.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/papabravo.37203/", "name": "Papabravo", "url": "https://www.electro-tech-online.com/members/papabravo.37203/" } }, { "@type": "Answer", "datePublished": "2024-04-17T16:05:16+00:00", "url": "https://www.electro-tech-online.com/posts/1450636/", "text": "Because IC 555 is, as we say, the French Wrench of ICs\n\nIt may be for timing circuits but, as noted, it's ill suited to PWM switcher power supply applications.\nA dedicated switching power supply IC is best for that purpose.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/crutschow.85027/", "name": "crutschow", "url": "https://www.electro-tech-online.com/members/crutschow.85027/" } }, { "@type": "Answer", "datePublished": "2024-04-16T21:12:07+00:00", "url": "https://www.electro-tech-online.com/posts/1450603/", "text": "Greetings to the colleagues of the forum\nI have always thought that I can start and use all MOSFETs of switching power supplies with IC 555. Is it possible? Because IC 555 is, as we say, the French Wrench of ICs, can it be used as a module for all power sources that require a MOSFET gate and feedback?\n\n\nNo.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/etech.201801/", "name": "eTech", "url": "https://www.electro-tech-online.com/members/etech.201801/" } } ] }, "publisher": { "@type": "Organization", "name": "Electronics Forum (Circuits, Projects and Microcontrollers)", "description": "An electronics forum to talk all about circuits and projects.", "url": "https://www.electro-tech-online.com" } } </script>  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MMC9PJ9" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>   <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-KLX5R59" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>  <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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