DC-DC converter has 185°C rating, for down-hole applications

July 08, 2015 // By Graham Prophet
IR HiRel, an Infineon Technologies company, has introduced its HiRel HTB28 series, claimed as the first hermetic hybrid DC-DC converters rated at 185ºC in a 1-inch wide package.

The devices are designed specifically for oil and gas exploration downhole tools and can withstand the high temperature as well as the high shock environment typically found in these applications. As oil and gas are more and more difficult to find, exploration takes place in environments which are challenging and where temperatures are higher.

This off-the-shelf product family with multiple output voltage options speeds time-to-market for downhole tool manufacturers in challenging designs requiring operating temperature up to 185 ºC. The HTB28 series provides high reliability through a conservative and rigorous design approach and using hermetic hybrid packaging technology that also enables a highly compact package 1 inch wide, 3.82 inch long (including the flange) and 0.41 inch high, saving an estimated 20% of space compared to a PCB-based product. The HTB28 series can fit in the smallest downhole drilling tools in the market or in development.

“DC-DC converters typically use optical feedback which doesn’t work at 185 ºC. IR HiRel has developed a proprietary, magnetically coupled feedback topology and a unique IC to address this functionality,” said Odile Ronat, Infineon’s IR HiRel Marketing Director.

The 5W, 28V input isolated DC-DC converters offer 69% minimum efficiency up to 185ºC and feature internal input and output filters, low input quiescent current and overcurrent protection. Most downhole applications require no more than 1000 hours of life at 185 ºC. The HTB28 Series passed 1200 hours to exceed the maximum requirement. IR HiRel adds that it has selected and qualified components that operate at high temperature and designed around them to maintain performance over the entire temperature range.

IR HiRel; www.infineon.com