/members-area/personalblogs/b/blog/posts/cpld-controlled-door-lock---first-stage-testingI think this emoticon says it all! Today I got some parts, including the LD1086D2T33TR regulator chips. I connected ground to ground and 24V to the input pin and I expected 3.3V on the output pin but what I got was my bench power supply going i...en-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/blog/posts/cpld-controlled-door-lock---first-stage-testingSun, 24 May 2015 14:47:13 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:8aa56f78-516f-4fa8-8394-feeff4ddd490oldmanraskers0<p>I have ordered new chips and though I am not treating the new chips any differently they are working perfectly - with cap and without caps <span>[View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-8aa56f78-516f-4fa8-8394-feeff4ddd490/contentimage_5F00_53.png:16:16]</span>. So, moving on I have tested my two power regulation stages and I am now getting a steady 3V3 and 1V8 output.</p><img src="https://community.element14.com/aggbug?PostID=20894&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/blog/posts/cpld-controlled-door-lock---first-stage-testingThu, 21 May 2015 08:30:25 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:8aa56f78-516f-4fa8-8394-feeff4ddd490michaelkellett1<p>Should have worked, my guess is a cap the wrong way round or swapped connections on the regulator.</p><p>&nbsp;</p><p>Can you run your bench supply at lower voltages and current limit.</p><p>&nbsp;</p><p>I would start off with a 50mA current limit and wind the volts up from zero, checking the regulator output as I go. If it takes more than 5V in to get 3.3 out then something is wrong. With no load you shouldn&#39;t see more than 10mA input current.</p><p>&nbsp;</p><p>MK</p><img src="https://community.element14.com/aggbug?PostID=20894&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">