IRMCF311

4

1 Overview

IRMCF311 is a new International Rectifier integrated circuit device primarily designed as a one-

chip solution for complete inverter controlled air conditioner motor control applications. Unlike a

traditional microcontroller or DSP, the IRMCF311 provides a built-in closed loop sensorless

motion control sequencer and dual port RAM to map internal signal nodes. IRMCF311 also

employs a unique single shunt current reconstruction circuit to eliminate additional analog/digital

circuitry and enables a direct shunt resistor interface to the IC. Motion control programming is

development environment. Sequencing, user interface, host communication, and upper layer

control tasks can be implemented in the 8051 high-speed 8-bit microcontroller. The 8051

microcontroller is equipped with a JTAG port to facilitate emulation and debugging tools. Figure 1

shows a typical application schematics using IRMCF311.

IRMCF311 is intended for development purpose and contains 48K bytes of RAM, which can be

loaded from external EEPROM for 8051 program execution. For high volume production,

IRMCK311 contains OTP ROM in place of program RAM to reduce the cost. Both IRMCF311

and IRMCK311 come in the same 64-pin QFP package with identical pin configuration to

facilitate PC board layout and transition to mass production

Passive

EMI

Filter

IRMCF311

Galvanic

Isolation

IRS2630D

IPM

DC bus

Communication

to indoor unit

AC input

(100-

230V)

Compressor

Motor

SPM

IRS2631D

60-100W

Fan Motor

IGBT inverter

FREDFET inveter

EEPROM

7

6

2

User Parameter

Storage

Analog output

Digital I/O

2

1

3

Temperature feedback

Analog actuators

Relay, Valves, Switches

Motor PWM +

PFC+GF

Fault

EEPROM

User Program

Storage

Analog input

Galvanic

Isolation

Field

Service

Fault

RS232C

Serial Comm

Temp sense

Multple

Power

supply

Motor PWM

15V

3.3V

1.8V

Figure 1.

Typical Application Block Diagram Using IRMCF311