The intended application is for nominal inputs of 48 V or 54 V with possible long cable lengths and consequent voltage drops such as microwave radio links for example. In this case, the low input drop-out voltage of the part is an advantage to guarantee extended operation, and the input range is also compatible with PoE standard IEEE 802.3af (37-57 VDC).
The PKU3913D is designed for high efficiency at lower input voltages, peaking at over 95%. The parts feature pre-bias, monotonic start-up capability, remote on/off and an MTBF of 13.88 M hours at 40°C ambient according to Telcordia standards. Products are certified to IEC/EN/UL 62368-1 for 2250 VDC input to output isolation.
Comprehensive protection is included against over-temperature, input undervoltage, and output overvoltage, over-current and short circuits.
The PKU3913D series is housed in a 33.02 mm x 22.86 mm footprint and is just 11.3 mm high in the open-frame formats, with optional through-hole or SMT termination, or just 12.7 mm high for the pinned version with optional base plate. Size and pin-out is industry-standard.
