lRPT5051A

The lRPT5051A Power Assembly The IRPT50 51A power assembly (figure 1) consists of input rectifiers, an NTC thermistor, an output inverter and connectors, all mounted on an Insulated Metal Substrate (IMS). The input side employs 16OOV SMD-220 rectifier diodes, while the inverter section employs SMD-10 surface-mount 12OOV short-circuit-rated IGBT co-pack switches. The NTC thermistor mounted near the inverter provides temperature sensing capability.

The lead spacing on the power assembly meet UL840 pollution level 2 requirements.

The power circuit and layout lRPT5051A are carefully designed to minimize inductance on the power path, to reduce noise during
inverter operation and to improve inverter efficiency. The driver board required to run the inverter can be interfaced to the power assembly through solder pins thus minimizing assembly and alignment effort. The power assembly is designed to be mounted to a heat sink with five screw mount positions (one in each corner and a fifth near the center) in order to insure good thermal contact between the IMS and the heat sink.