150W ac-dc supply for digital signage
“Digital signage applications are continuously working at full capacity most of the time,” according to Ideal, adding that: “in digital signage applications, the power supply is often placed in an enclosed space without good ventilation or a fan,” and going on to advocate the use of high MTBF (mean time between failures) supplies – TAF150, calculated with respect to MIL-HDBK-217F is 7.861 x 105 hours at full load, although at 25℃ ambient.
Called TAF150 series, the PSUs are intended to operate over -40 to 85ºC, with full power available at up to 60ºC ambient, with derating there after.
Operation is with inputs across 85 to 264Vac, at 47 – 63Hz.
Output is 12Vdc (adjustable +/-10%), efficiency is up to 91%, with stand-by below 300mW.
Active power factor correction is included, as is an EMI filter – EMI to EN55011, EN55032 and FCC Part 15 is Class B conducted and Class A radiated. “External components may be required for class I application,” said Ideal.
Looking at the data sheet, it appears that the TAF150 series can also handle dc inputs between 120 and 370V, and also comes in versions with outputs at 15, 24, 28, 36 or 48V.
Unit size is 2 x 4in nominal (50.8 x 101.6mm) by 29.5mm.
* 150W (12.5A), again according to the data sheet, is only available with forced air cooling at 10CFM – there is a with-fan option. The TAF versions are only rated at 100W with natural convection.