/products/roadtest/b/blog/posts/ti-swift-power-module-evm-review-part-3-analog-tests-of-the-power-modulePart 2: Test the analog features of the TPSM84A21 EVM To be Tested Features of TPSM84A21: Output voltage ripple measurements (with and without external capacitors)Tests at high output current with external loadThe Vin, Vout and PGOOD start up w...en-USTelligent Community 12https://community.element14.com/products/roadtest/b/blog/posts/ti-swift-power-module-evm-review-part-3-analog-tests-of-the-power-moduleMon, 02 Apr 2018 20:21:53 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:3348f4b2-9c08-4244-91bd-025f796c886bhlipka1<p>Also an interesting read: <a class="jive-link-external-small" href="https://e2e.ti.com/blogs_/b/powerhouse/archive/2016/07/27/how-you-measure-your-ripple-can-make-you-or-break-you?hootPostID=f09be6a7bb13cb35ad747260d92c880b" rel="nofollow ugc noopener" target="_blank" title="https://e2e.ti.com/blogs_/b/powerhouse/archive/2016/07/27/how-you-measure-your-ripple-can-make-you-or-break-you?hootPostID=f09be6a7bb13cb35ad747260d92c880b">https://e2e.ti.com/blogs_/b/powerhouse/archive/2016/07/27/how-you-measure-your-ripple-can-make-you-or-break-you?hootPost…</a> </p><p>One important item from the list of things to take care of: use 50ohm input impedance - with 1MOhm the scope is prone to pick up additional noise.</p><img src="https://community.element14.com/aggbug?PostID=4582&AppID=14&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/products/roadtest/b/blog/posts/ti-swift-power-module-evm-review-part-3-analog-tests-of-the-power-moduleMon, 02 Apr 2018 16:38:06 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:3348f4b2-9c08-4244-91bd-025f796c886bfmilburn2<blockquote class="jive-quote"><p><span>Even with the 21Watt 0.1 ohm it can concluded that the device struggles to deliver the output current hence once can say that at high currents the efficiency of the device is low.</span></p></blockquote><p>Hi, </p><p>&nbsp;</p><p>Regarding above, is the efficiency less than that given in the datasheet?&nbsp; My measurements up to 8 amps were equal to or better than the datasheet.&nbsp; Or, does it mean the device cannot deliver rated current?&nbsp; Also, do you suspect any change in resistance in the load due to heating which would impact observed Vs expected values. </p><p>&nbsp;</p><p>Regards,</p><p>Frank</p><img src="https://community.element14.com/aggbug?PostID=4582&AppID=14&AppType=Weblog&ContentType=0" width="1" height="1">