Aircraft power converter PH28

AC/DC

The PH28 is a pulse width modulated ac to dc power converter that provides regulated 4-28 Vdc output with up to 10 amperes continuous output current. This converter is primarily designed for 115V/400 Hz aircraft systems to deliver variable 4 to 28 Vdc power to incandescent lamps or LED loads for airborne/ground instruments, navigation and electronic systems. The unit can also be used as a fixed output voltage source between 14 Vdc and 28 Vdc. The DC output is factory calibrated to 28 Vdc at the receptacle for a 10 amp load. The output voltage level is controlled manually by the duration of grounding the Dim or Bright control pin through an external momentary On-Off toggle switch. Specifications Normal 105 Vac to 125 Vac Abnormal 95 Vac to 130 Va Regulation 2% for load, 1% for line and 2% for temperature Response Time 10mSec typical Overload (OL Deliver 110% output power for 2 hours Thermal The unit shuts down for thermal overload exceeding 105 °>C temperature inside Protection (OL) Withstands without damage or degradation load exceeding 110% to an output short circuit. Unit delivers rated output power upon removal of the overload condition Protection (SC) Under a output short circuit condition, the input and output currents pump and the currents are limited to safe values. Control The output voltage is increased by grounding pin G and decreased by grounding pin A. When the ground is removed (OFF) the output voltage stops changing. The total time it takes from BRT to DIM (or DIM to BRT) using a continuous grounding is about 7 seconds.