X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
X-Original-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=gmail.com; s=20161025;
	h=mime-version:in-reply-to:references:from:date:message-id:subject:to;
	bh=1m8JJW6WNx9MgBau29gtnJMTTC3m82fDAzBoNbeGHxw=;
	b=Tyt63DHKK+cncD/eNuTTZj4/20XLtj2bzUR6v73cKG0IfitIVLqle3keLto/Au05yA
	h3dBYVTjULZTyNZxRNtWWMEgTT8478eNI2WRcsYj4VnpzT3cMhhUiVPvr2LH4XrMmDHR
	iS4KWv+NmhKDwwL4fkdHrn2UBLXOBjyYobsn+z+eR/eMnuv1K888k3rXhpWxx2RIw9u+
	KEuj9uEil2dx8GYpKphrA6myPMDpRKcc4zd5IXNnSXWxqxnjkeLU7M6O9zZf0YIeKsXK
	3CyAq6M3O+BlOcw552r4UIrHq4oXGWnGhoeem2BvgVXTE+0VWkqGraoo2iKJvhgSghBG
	t1SQ==
X-Google-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=1e100.net; s=20161025;
	h=x-gm-message-state:mime-version:in-reply-to:references:from:date
	:message-id:subject:to;
	bh=1m8JJW6WNx9MgBau29gtnJMTTC3m82fDAzBoNbeGHxw=;
	b=mVwoHMG9CuRO/SGC/xBOvMdMctPF4f4fGDUmiNbxQzQdAuA0WK1qNfiGr5I2RpdN2d
	CnQfbDIUxmtHtyuMJMXeL6DK1RwzP1Nn/ailORwtQpipSmIb9A1vSxV1wU16PHcgGT51
	GbWaEV+YMWXot1RKrRueQkqVo1DMoJzNjpNhS4Ol4eWoc+bmBdTxfoYfCvgQm6KgV5ks
	zut/dUxhvpmareKRQ+n6y1kSqpymWIs0hpbxyFmsteW2cCNmkARUjkQDgPVbv5U/aUfO
	+01fkwruPjvRgO1n8xbPVP5mF2YFHFTAA6XCGFjbD/p8PuzRnLrhL9h/QHGx8t2W+dh3
	oXyw==
X-Gm-Message-State:	AA+aEWZx8wwrZTecCI6cM5qiCy2mCwzzxOjwT56iZF3qFsenG/AczE2N
	43nG8oIVZoQejU9OH0WInV2pgF9jJCNmB2Wh9SG/Bg4E
X-Google-Smtp-Source:	AFSGD/WQGpAMqhpfsU6AKJJQstiX2f6Oju8X4bijxvt88NAdd7L2JroodEx86LZ+U9an9jBRgPlEIFqxNyDcZYiUpMg=
X-Received:	by 2002:aca:4d47:: with SMTP id a68mr1003370oib.43.1543504705670;
	Thu, 29 Nov 2018 07:18:25 -0800 (PST)
MIME-Version:	1.0
In-Reply-To:	<CAOuGh8_huApMbSoUOuTTDS10kn+ZiPOtoLfQCo3L8aiaDmFUPA@mail.gmail.com>
References:	<eda2cdce-ccc4-67f4-ccde-6798043e5f41 AT linetec DOT nl>
	<B4FB33EE-C263-4E55-AFAB-63059CAC342B AT noqsi DOT com> <7c1717bb-1b7d-360f-d06a-71ee6983eea1 AT linetec DOT nl>
	<CAGqyy=bCkYxADbRhjfAeCkt2bOccMGUDFHMRy5myyXWjZ3s8_w AT mail DOT gmail DOT com>
	<e2fcdb04-5b05-351f-8c05-386c588b9ebb AT linetec DOT nl> <CAGqyy=aPKOLPG+=Wum8Vi=6f51hS+4rhjrz=UYedYkkPvUVU_A AT mail DOT gmail DOT com>
	<54e56571-e668-f382-5f18-7e8f579c8531 AT linetec DOT nl> <CAGqyy=ZnzCZm+=Yxe=Et0zqsPVHCG9TmyGtZnrFQfy8UiWknyQ AT mail DOT gmail DOT com>
	<30435625-5dca-7b6f-93af-a322faaea7a3 AT linetec DOT nl> <CAOuGh8_huApMbSoUOuTTDS10kn+ZiPOtoLfQCo3L8aiaDmFUPA AT mail DOT gmail DOT com>
From:	"Luis de Arquer (ldearquer AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Thu, 29 Nov 2018 16:18:25 +0100
Message-ID:	<CAGqyy=ZOCN0+Ko0qCeJhf_dHK72GF42UkCLUL8bEt3FMNKUHjg@mail.gmail.com>
Subject:	Re: [geda-user] [off-topic] 24V automotive (truck) design issues
To:	geda-user AT delorie DOT com
Reply-To:	geda-user AT delorie DOT com
Errors-To:	nobody AT delorie DOT com
X-Mailing-List:	geda-user AT delorie DOT com
X-Unsubscribes-To:	listserv AT delorie DOT com

Richard,

Your proposed circuit seems OK to me. Just make sure the feedback is
strong enough so the MOSFET never stays in active zone (especially
since it has low-ish gate threshold voltage).

We considered using this from Texas Instruments in some project -we
didn't need to eventually:
http://www.ti.com/lit/an/snva190b/snva190b.pdf

Maybe your problem was, after all, with the negative 1ms - 2ms pulse.
That one is pretty bad, and TVS energy spec is not too far from it
(600W 1 ms 25deg IIRC, worse with higher temperature).

Also, since your current consumption is not too high, maybe you could
consider adding some line resistance, if cost is an issue for you.

Keep us posted :)

Luis

- Raw text -