Received: from PCH.mit.edu (18.7.21.50) by mail.efplus.com (192.168.0.8) with Microsoft SMTP Server (TLS) id 8.3.485.1; Mon, 27 Apr 2020 12:37:38 -0700 Received: from PCH.MIT.EDU (localhost.localdomain [127.0.0.1]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 03RJRaGl029628; Mon, 27 Apr 2020 15:28:08 -0400 Received: from outgoing-exchange-7.mit.edu (OUTGOING-EXCHANGE-7.MIT.EDU [18.9.28.58]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 03RJRY1h029625 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Mon, 27 Apr 2020 15:27:34 -0400 Received: from oc11exedge2.exchange.mit.edu (OC11EXEDGE2.EXCHANGE.MIT.EDU [18.9.3.18]) by outgoing-exchange-7.mit.edu (8.14.7/8.12.4) with ESMTP id 03RJQxOc017881 for ; Mon, 27 Apr 2020 15:27:06 -0400 Received: from w92exhyb7.exchange.mit.edu (18.7.71.112) by oc11exedge2.exchange.mit.edu (18.9.3.18) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Mon, 27 Apr 2020 15:26:47 -0400 Received: from oc11exhyb6.exchange.mit.edu (18.9.1.111) by w92exhyb7.exchange.mit.edu (18.7.71.112) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 27 Apr 2020 15:27:32 -0400 Received: from NAM10-BN7-obe.outbound.protection.outlook.com (104.47.70.101) by oc11exhyb6.exchange.mit.edu (18.9.1.111) with Microsoft SMTP Server (TLS) id 15.0.1395.4 via Frontend Transport; Mon, 27 Apr 2020 15:27:32 -0400 Received: from CO2PR04CA0191.namprd04.prod.outlook.com (2603:10b6:104:5::21) by MWHPR0101MB3022.prod.exchangelabs.com (2603:10b6:301:30::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2937.13; Mon, 27 Apr 2020 19:27:31 +0000 Received: from CO1NAM03FT054.eop-NAM03.prod.protection.outlook.com (2603:10b6:104:5:cafe::7f) by CO2PR04CA0191.outlook.office365.com (2603:10b6:104:5::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2937.13 via Frontend Transport; Mon, 27 Apr 2020 19:27:31 +0000 Received: from mail-yb1-f173.google.com (209.85.219.173) by CO1NAM03FT054.mail.protection.outlook.com (10.152.81.181) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2921.25 via Frontend Transport; Mon, 27 Apr 2020 19:27:30 +0000 Received: by mail-yb1-f173.google.com with SMTP id i16so10077522ybq.9 for ; Mon, 27 Apr 2020 12:27:30 -0700 (PDT) From: Manu Abraham To: Microcontroller discussion list - Public. Sender: "piclist-bounces@mit.edu" Date: Mon, 27 Apr 2020 12:27:17 -0700 Subject: Re: [EE] Voltage regulator with high input voltage Thread-Topic: [EE] Voltage regulator with high input voltage Thread-Index: AdYcy09b76T05LLsSOe0oNrXC9niQw== Message-ID: References: List-Help: List-Subscribe: , List-Unsubscribe: , In-Reply-To: Reply-To: Microcontroller discussion list - Public. Accept-Language: en-US X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-AuthSource: TS500.efplus4.local X-MS-Has-Attach: X-Auto-Response-Suppress: All X-MS-Exchange-Organization-SenderIdResult: Pass X-MS-Exchange-Organization-PRD: mit.edu X-MS-TNEF-Correlator: received-spf: Pass (protection.outlook.com: domain of gmail.com designates 209.85.219.173 as permitted sender) receiver=protection.outlook.com; client-ip=209.85.219.173; helo=mail-yb1-f173.google.com; dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=SWpCEl3oWFXhXfkzYE03Fx1GJ6R22Nkd2JR6WVK6gRQ=; b=MCDUzO1ryA69ZuWP8FXgVml+5YBoY1c5BubhW+rxIUGNsrewEdsW4DBHk8/tQ13Dqi od1beCICMmjv8uM22dOjfE+U4QQq89PdcKzngNw/WVCWzfJVNYsmkOXDvzoawOLeP8ul Vwi7ZE+6iD7G7upmYaNqGTph40HmE4aPRvAdSA8ZPb/Y5sP12ifkZXp7nivelWdrDgBh JoPE1Swrfgq48L0Uk3DmHrdtZVZCayt9XX3Djiyh5Iad7dMa7PuJy1mlqCOJRKhgMV9a I6NUdgXl1O1Km5/h0QoNRBpNPlXO2TJiQNuNfnensR+LYXD+l3sg8bdTKXAYzHOu76H/ YrBA== authentication-results: spf=pass (sender IP is 209.85.219.173) smtp.mailfrom=gmail.com; mit.edu; dkim=pass (signature was verified) header.d=gmail.com;mit.edu; dmarc=pass action=none header.from=gmail.com;compauth=pass reason=100 errors-to: piclist-bounces@mit.edu list-id: "Microcontroller discussion list - Public." list-post: x-beenthere: piclist@mit.edu x-mailman-version: 2.1.6 x-received: by 2002:a25:c981:: with SMTP id z123mr37304162ybf.426.1588015649153; Mon, 27 Apr 2020 12:27:29 -0700 (PDT) x-topics: [EE] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 On Mon, Apr 27, 2020 at 11:05 PM David VanHorn wrote: > > A buck switcher would be the way to go. Input protection from transients > might need to be added. > +1 Even 2 or 3 transistors put together as a switching regulator would work well, since current drawn is significantly less (assuming a charlieplexed 7 segment). --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .