-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On Mon, 8 Apr 2013 18:21:59 -0600 Mark Rages wrote: > On Mon, Apr 8, 2013 at 2:03 PM, Christopher Head > wrote: > > > > fine; it just recharged the battery a little bit. On the bench, it > > turns out the cheap bench supply is able to source, but not sink, > > current, so the supply rail went up to almost 30 volts. We replaced > > a lot of TC4469s before figuring this out, and ended up insisting > > that all parts be rated for at least 30 volts (as well as adding a > > TVS). >=20 >=20 > What? That's a terrible solution. Where did the energy go after you > made the change? Some of it goes into the TVS. Some of it goes into decoupling caps (which together have a decent amount of capacitance), raising the voltage somewhat (but not too much), after which it gets consumed by other parts of the system over the course of the next handful of milliseconds. Where else should it go? (honest, not sarcastic, question) Chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iF4EAREIAAYFAlFkZdsACgkQMcVpqLZH/3xYhAEAggjvL/5ZRTBm1NuljAh3mUF1 WOftbiinTXDeULWoI4wA/AlcFfJsrk+eSWhWeBymuIV1TyOMWecawOgDpaTlo9td =3Dxggr -----END PGP SIGNATURE----- --=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 .