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IRPT2056A

System Description

Power Module

The IRPT2056A Power Module, shown in figure 1, is a chip

and wire epoxy encapsulated module. It houses input rectifiers,

output inverter, current sense shunts and NTC thermistor. The 3-

phase input bridge rectifiers are rated at 800V. The brake circuit

uses 600V IGBT and freewheeling diode. The inverter section

employs 600V, short circuit rated, ultrafast IGBT's and ultrafast

freewheeling diodes. Current sensing is achieved through 25

m

Ω low inductance shunts provided in the positive and negative

DC bus rail. The NTC thermistors provide temperature sensing

capability. The lead spacing on the power module meets UL840

pollution level 3 requirements.

The power circuit and layout within the module are carefully

designed to minimize inductance in the power path, to reduce

noise during inverter operation and to improve the inverter

efficiency. The Driver-Plus Board required to run the inverter

can be soldered to the power module pins, thus minimizing

assembly and alignment. The power module is designed to be

mounted to a heat sink with two screw mount positions, in order

to insure good thermal contact between the module substrate and

the heat sink.

and Design Kit

The IRPT2056C

(Figure 3) provides the

complete power conversion function for a 3 hp (2.2 kW) variable

voltage, variable frequency AC motor controller. The

combines the Power Module (IRPT2056A)

with a Driver-Plus Board (IRPT2056D). The

Design Kit, IRPT2056E includes the following:

• Complete

integrated power stage

• Specification and operating instructions

• Bill of materials

• Electrical schematic

• Mechanical layout of the Driver-Plus Board

• Software transferrable file for easy design integration

• Application information and layout considerations

Figure 3. IRPT2056C