{"id":2056,"date":"2014-08-18T08:55:54","date_gmt":"2014-08-18T11:55:54","guid":{"rendered":"http:\/\/tangopardo.com.ar\/2cf7\/?p=2056"},"modified":"2014-08-19T11:57:35","modified_gmt":"2014-08-19T14:57:35","slug":"driver-strength","status":"publish","type":"post","link":"https:\/\/tangopardo.com.ar\/2cf7\/2014\/08\/18\/driver-strength","title":{"rendered":"Driver strength."},"content":{"rendered":"<p><a title=\"Inductor saturation tester\" href=\"http:\/\/tangopardo.com.ar\/2cf7\/2014\/08\/11\/inductor-saturation-tester\">Last time<\/a> I made a pulse generator to drive, among other things, some mosfets. When loaded with a gate its rise time increases to about 200ns, trying out some capacitors I get the same result with 5nF. While it is not quite right to approximate the gate with a simple capacitor it helps to ballpark the driver needs.<\/p>\n<p>The output swings 10 volts on 200ns (10%-90% of 12.5 volts) on a 5nF cap. I = C*dV\/dt , so 250mA are flowing. If I want a faster driver I&#8217;ll need to add another stage, as the BC548 won&#8217;t give me much more current. LTSpice kind of agrees with these numbers, but I need to put 15nF to match the rise time (and the current increases accordingly).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Last time I made a pulse generator to drive, among other things, some mosfets. When loaded with a gate its rise time increases to about 200ns, trying out some capacitors I get the same result with 5nF. While it is not quite right to approximate the gate with a simple capacitor it helps to ballpark [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[13],"tags":[],"class_list":["post-2056","post","type-post","status-publish","format-standard","hentry","category-electronica"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pmnbC-xa","_links":{"self":[{"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/posts\/2056","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/comments?post=2056"}],"version-history":[{"count":1,"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/posts\/2056\/revisions"}],"predecessor-version":[{"id":2057,"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/posts\/2056\/revisions\/2057"}],"wp:attachment":[{"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/media?parent=2056"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/categories?post=2056"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tangopardo.com.ar\/2cf7\/wp-json\/wp\/v2\/tags?post=2056"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}