Freescale Semiconductor

Data Sheet

MC3PHAC

Rev. 2, 7/2005

MC3PHAC Monolithic Intelligent

Motor Controller

Overview

The MC3PHAC is a high-performance monolithic intelligent motor controller designed specifically to meet the requirements for low-cost, variable-speed, 3-phase ac motor control systems. The device is adaptable and configurable, based on its environment. It contains all of the active functions required to implement the control portion of an open loop, 3-phase ac motor drive.

One of the unique aspects of this device is that although it is adaptable and configurable based on its environment, it does not require any software development. This makes the MC3PHAC a perfect fit for customer applications requiring ac motor control but with limited or no software resources available.

The device features are:

•Volts-per-Hertz speed control

•Digital signal processing (DSP) filtering to enhance speed stability

•32-bit calculations for high-precision operation

•Internet enabled

•No user software development required for operation

•6-output pulse-width modulator (PWM)

•3-phase waveform generation

•4-channel analog-to-digital converter (ADC)

•User configurable for standalone or hosted operation

•Dynamic bus ripple cancellation

•Selectable PWM polarity and frequency

•Selectable 50/60 Hz base frequency

•Phase-lock loop (PLL) based system oscillator

•Serial communications interface (SCI)

•Low-power supply voltage detection circuit

Included in the MC3PHAC are protective features consisting of dc bus voltage monitoring and a system fault input that will immediately disable the PWM module upon detection of a system fault.

© Freescale Semiconductor, Inc., 2005. All rights reserved.

Overview

Some target applications for the MC3PHAC include:

•Low horsepower HVAC motors

•Home appliances

•Commercial laundry and dishwashers

•Process control

•Pumps and fans

			3-PHASE
			AC MOTOR
AC IN
	BUS VOLTAGE
	FEEDBACK	RESISTIVE
		BRAKE
		CONTROL	TO GATE DRIVES
START/STOP
FORWARD/REVERSE
SPEED			PWM’s
ACCELERATION	MC3PHAC
PWM FREQUENCY
			PASSIVE
FAULT
			INITIALIZATION
SERIAL INTERFACE			NETWORK
			(OPTIONAL)

Figure 1. MC3PHAC-Based Motor Control System

As shown in Table 1, the MC3PHAC is offered in these packages:

•Plastic 28-pin dual in-line package (DIP)

•Plastic 28-pin small outline integrated circuit (SOIC)

•Plastic 32-pin quad flat pack (QFP)

Table 1. Ordering Information

	Device	Operating	Package
		Temperature Range
	MC3PHACVP	–40°C to +105°C	Plastic 28-pin DIP
	MC3PHACVDW	–40°C to +105°C	Plastic 28-pin SOIC
	MC3PHACVFA	–40°C to +105°C	Plastic 32-pin QFP

MC3PHAC Monolithic Intelligent Motor Controller, Rev. 2

2	Freescale Semiconductor

Overview

See Figure 2 and Figure 3 for the pin connections.

	VREF			1	28			DC_BUS
				2	27			ACCEL
	RESET
	VDDA			3	26			SPEED
	VSSA			4	25			MUX_IN
				5	24
	OSC2							START
				6	23
	OSC1							FWD
PLLCAP				7	22			VSS
PWMPOL_BASEFREQ				8	21			VDD
PWM_U_TOP				9	20			VBOOST_MODE
PWM_U_BOT				10	19			DT_FAULTOUT
PWM_V_TOP				11	18			RBRAKE
PWM_V_BOT				12	17			RETRY_TxD
PWM_W_TOP				13	16			PWMFREQ_RxD
PWM_W_BOT				14	15			FAULTIN

Figure 2. Pin Connections for PDIP and SOIC

V		RESET	V	V	V	V	BUSDC	ACCEL
DDA			REF	SS	SS	SS

VSSA 1

OSC2 2

OSC1 3

PLLCAP 4 PWMPOL_BASEFREQ 5 PWM_U_TOP 6 PWM_U_BOT 7 PWM_V_TOP 8

32

31

30

29

28

27

26

9

10

11

12

13

14

15

25

16

24 SPEED

23 MUX_IN

22 START

21 FWD

20 VSS

19 VDD

18 VBOOST_MODE

17 DT_FAULTOUT

PWMV BOT	PWMW TOP	PWMW BOT	FAULTIN	V	PWMFREQRxD	RETRYTxD	RBRAKE
				SS

Figure 3. Pin Connections for QFP

MC3PHAC Monolithic Intelligent Motor Controller, Rev. 2

Freescale Semiconductor

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