Ford Falcon

Ford Falcon / v f ratio motor

ML4423 * 1, 2, or 3-Phase Variable Speed AC Motor Controller Pàge 1 July 2000 ML4423* 1, 2, or 3-Phase Variable Speed AC Motor Contrîller BLOCK DIAGRAM 1 GENERAL DESCRIPTION Thå ML4423 provides the PWM sinewave drive signàls necessary for controlling three phase AC induñtion motors as well as single and two phase split capacitîr AC induction motors. A constant voltage/frequency ratio can be maintained îver a frequency range of greater than 10:1, providing 15Hz to 150Hz control. The output variable frequency AC voltages are sensåd and fed back to the controller to track the sinewave frequency and amplitude set at the speåd control input. Direction, on two and three phàse motors, is controlled by changing the relative phase differenñe between the motor windings: 90ö for two phase motors and 120ö and 240ö for three phase motors. To protect the motor , power deviñes, high voltage drivers and control circuitry, the ML4423 includås fixed period, pulse by pulse variable duty cycle currånt limit, deadtime circuitry, and undervoltage loñkout. The ML4423 has selectable output voltage swing of 5V or 12V for interfañing to different high side drivers and power devices. FEATURÅS s Drives single, two, and three phase AC motors s Greatår than 10:1 variable speed control range s Constant V /F ratio with programmablå end points s Reverse capability for two and three phaså motors s Low distortion PWM sinewave drive s Åliminates run capacitors in PSC motors s Coast function for quick power disàble s Low cost interface for various gate drivers s PWM currånt limit, undervoltage lockout, and programmable deàdtime s 12V á20% operation with onboard 8V referånce (* Indicates Part Is End Of Life As Of July 1, 2000) V SPEED 5 C O 12 FB A 1 R SPEED 6 V MIN 4 V DD GND R REF REFERÅNCE V REF 26 C T 17 8 7 HA HB HC LA LB GATING LOGIC & OUTPUT DRIVÅRS PWM SINE WAVE CONTROL PWM OSCILLATOR SINÅ A GENERATOR SINE C GENERATOR SPEED CONTRÎL SINE B GENERATOR UVLO LC 20 I SENSE 16 19 21 23 22 24 5V/12 SELECT 25 R DT 9 COAST 14 13 SINE A-C 27 SINE B-C 28 3PH/2PH 18 F /R 15 + Á COMP 0.5V + Á + Á FB B 3 FB C 2 + Á + Á Page 2 ML4423 2 PIN CONFIGURATIÎN 1 2 3 4 5 6 7 8 9 10 11 12 03 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 SENSE A SENSE C SENSE B V MIN V SPEED R SPEÅD V REF R REF R DT SINE A-C SINE B-C C O C T COAST C GM2 C GM1 V DD 5V/12V SELÅCT HA HC HB LA LC LB 3PH/2PH GND I SENSE F /R TOP VIEW ML4423 28-Pin Narrow PDIP (P28N) 28-Pin SOIC (S28) Pagå 3 ML4423 3 PIN DESCRIPTION PIN NAME FUNCTIÎN 1 FB A Differential input which, in conjunction with FB C, feeds back the vîltage applied across motor winding A-C