{"id":4479,"date":"2018-03-23T06:25:46","date_gmt":"2018-03-23T06:25:46","guid":{"rendered":"http:\/\/blog.uk.tdk-lambda.com\/uk\/?p=4479"},"modified":"2018-02-22T10:35:07","modified_gmt":"2018-02-22T10:35:07","slug":"replacing-an-isolated-1-16th-or-1-32nd-footprint-dc-dc-converter-with-the-i6a-and-i3a-non-isolated-converters","status":"publish","type":"post","link":"https:\/\/blog.uk.tdk-lambda.com\/uk\/2018\/03\/23\/replacing-an-isolated-1-16th-or-1-32nd-footprint-dc-dc-converter-with-the-i6a-and-i3a-non-isolated-converters\/","title":{"rendered":"Replacing an isolated 1\/16th or 1\/32nd footprint DC-DC converter with the i6A and i3A non-isolated converters"},"content":{"rendered":"

Some Distributed Power Architectures (DPAs) utilise 1\/16th and 1\/32nd \u201cbrick\u201d package isolated DC DC converters to step down a 24V or 48V DC source to produce 3.3V, 5V or 12V output voltages. This can be used to drive high performance Point of Load DC-DC converters capable of responding rapidly to high transient loading from FPGAs, or other devices requiring similar voltages.<\/p>\n

Non-isolated DC-DC converters in 1\/16th and 1\/32nd packages are now available offering lower cost, higher efficiency, and greater output power with the ability to operate in high ambient temperatures with simplified cooling. Examples are TDK-Lambda\u2019s i6A 250W rated 1\/16th series<\/a> and the i3A 100W rated 1\/32nd series<\/a>. These devices also have the ability to operate from wide input ranges and have very wide output adjustment.<\/p>\n

Isolated DC-DC converters do offer an input to output isolation barrier through the use of transformers and opto-couplers. This allows the output voltage to be floating and be used as a positive or negative polarity with respect to the system 0V. The isolation barrier can, in some applications, assist in reducing electrical noise. This, however, does drive up cost, increase power losses and limit the output rating of the device.<\/p>\n

Although the i6A and i3A are non-isolated, for a system operating from the AC mains, the AC-DC power supply already provides the primary to secondary isolation barrier and has safety certification to the IEC standards. Hence using an isolated DC-DC converter often has no benefits to the application. See Figure 1.<\/p>\n

\"\"<\/a><\/p>\n

Figure 1: Block diagram<\/em><\/p>\n

 <\/p>\n

The i3A and i6A non-isolated converters have the same footprint as the industry standard 1\/32nd and 1\/16th converters respectively.<\/p>\n

\"\"<\/a><\/p>\n

Figure 2: 1\/32nd converter pin locations (top view)<\/em><\/p>\n

 <\/p>\n

All the pin connections have the same functionality, except the isolated converters have no connection between the \u2013 V in and \u2013 V out pins and the \u2013V sense connection is redundant. Internally, the non-isolated converters have a connection between these two pins. See Table 1, and Figures 3 & 4.<\/p>\n

 <\/p>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Pin Number<\/td>\ni3A Non isolated 1\/32<\/td>\nIsolated 1\/32<\/td>\n<\/tr>\n
1<\/td>\n+V in<\/td>\n+V in<\/td>\n<\/tr>\n
2<\/td>\nRemote on\/off<\/td>\nRemote on\/off<\/td>\n<\/tr>\n
3<\/td>\n-V in and common 0V<\/td>\n-V in<\/td>\n<\/tr>\n
4<\/td>\n-V out and common 0V<\/td>\n-V out<\/td>\n<\/tr>\n
5<\/td>\nN\/C<\/td>\n-V sense<\/td>\n<\/tr>\n
6<\/td>\nTrim (Output adjustment)<\/td>\nTrim (Output adjustment)<\/td>\n<\/tr>\n
7<\/td>\n+V sense<\/td>\n+V sense<\/td>\n<\/tr>\n
8<\/td>\n+V out<\/td>\n+V out<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Table 1: 1\/32nd Pin Function Comparison (Non-Isolated and Isolated)<\/em><\/p>\n

 <\/p>\n

\"\"<\/a><\/p>\n

Figure 3: Isolated converter connections<\/em><\/p>\n

 <\/p>\n

\"\"<\/a><\/p>\n

Figure 4: Non-Isolated converter connections<\/em><\/p>\n

 <\/p>\n

To summarise, Table 2 shows a comparison between the 1\/32nd brick footprint i3A non-isolated series and a typical isolated converter series. Note that the non-isolated converters are \u201cstep down\u201d where the input voltage has to be slightly higher than the output voltage.<\/p>\n\n\n\n\n\n\n\n\n
Specification<\/td>\ni3A Non-isolated 1\/32<\/td>\nIsolated 1\/32<\/td>\n<\/tr>\n
Input Voltage<\/td>\n9 \u2013 53Vdc<\/td>\n36 \u2013 75Vdc<\/td>\n<\/tr>\n
Output Voltage<\/td>\n3.3-16.5 \/ 5-30Vdc<\/td>\n3.3, 5, 12
\n(-20\/+10% adjust)<\/td>\n<\/tr>\n
Output Power<\/td>\n100W<\/td>\nUp to 30W<\/td>\n<\/tr>\n
Efficiency<\/td>\nUp to 98%<\/td>\nUp to 92%<\/td>\n<\/tr>\n
$\/Watt
\nDistribution 1-9 piece price<\/td>\n		$0.23\/W<\/td>\n$0.81\/W<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Table 2: Comparison of 1\/32nd Converters<\/em><\/p>\n

 <\/p>\n

For more information about the full range of TDK-Lambda i3A and i6A series of non-isolated DC-DC converters, please visit: www.emea.lambda.tdk.com\/uk\/products\/dcdc-converters<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Some Distributed Power Architectures (DPAs) utilise 1\/16th and 1\/32nd \u201cbrick\u201d package isolated DC DC converters to step down a 24V or 48V DC source to produce 3.3V, 5V or 12V output voltages. This can be used to drive high performance Point of Load DC-DC converters capable of responding rapidly to high transient loading from FPGAs, […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[83,75,1],"tags":[],"class_list":["post-4479","post","type-post","status-publish","format-standard","hentry","category-i3a","category-i6a","category-power-supply-basics"],"acf":[],"yoast_head":"\nReplacing an isolated 1\/16th or 1\/32nd footprint DC-DC converter with the i6A and i3A non-isolated converters « TDK-Lambda UK Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.uk.tdk-lambda.com\/uk\/2018\/03\/23\/replacing-an-isolated-1-16th-or-1-32nd-footprint-dc-dc-converter-with-the-i6a-and-i3a-non-isolated-converters\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Replacing an isolated 1\/16th or 1\/32nd footprint DC-DC converter with the i6A and i3A non-isolated converters « TDK-Lambda UK Blog\" \/>\n<meta property=\"og:description\" content=\"Some Distributed Power Architectures (DPAs) utilise 1\/16th and 1\/32nd \u201cbrick\u201d package isolated DC DC converters to step down a 24V or 48V DC source to produce 3.3V, 5V or 12V output voltages. 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