ML4425 motor controller provides functions necessary starting controll

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ML4425 motor controller provides functions necessary starting controll

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ML4425 Sensorless BLDC Motor Controller
ML4425 motor controller provides functions necessary starting controlling speed delta wound Brushless (BLDC) motors without Hall Effect sensors. Back voltage sensed from motor windings determine proper commutation phase sequence using PLL. This patented sensing technique will commutate wide range 3Phase BLDC motors insensitive noise motor snubbing circuitry. ML4425 limits motor current using constant offtime control loop. velocity loop controlled with onboard amplifier. ML4425 circuitry ensure that there shoot-through directly driven external power MOSFETs. timing start-up sequence determined selection three timing capacitors. This allows optimization wide range motors loads.
FEATURES
Stand-alone operation Motor starts stops with power On-board start sequence: Align Ramp Speed Patented Back-EMF commutation technique provides jitterless torque minimum "spin-up" time Onboard speed control loop used commutation provides noise immunity from spikes, compared noise sensitive zero crossing technique control maximum efficiency Direct drive motors; drives high voltage motors with buffers from IXYS, Harris, Power Integrations, Siliconix, etc.
BLOCK DIAGRAM (Pin Configuration Shown Version)
750nA BACK SAMPLER 1.5V
750nA
SPEED CVCO
RVCO
1.5V
500nA VOLTAGE CONTROLLED OSCILLATOR VCO/TACH
COMMUTATION STATE MACHINE GATING LOGIC OUTPUT DRIVERS UVLO FAULT REFERENCE
SPEED SPEED COMP
3.9V
1.7V 20kHz ISENSE ILIMIT 1.7V VREF
ILIMIT 1-SHOT
1.4V
CIOS BRAKE
RREF
VREF
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ML4425
CONFIGURATION
ML4425 28-Pin Narrow PDIP (P28N) 28-Pin SOIC (S28)
ISENSE SPEED COMP VREF SPEED RREF CIOS BRAKE SPEED FAULT RVCO CVCO
ILIMIT VCO/TACH
VIEW
ML4425 32-Pin TQFP (H32-7)
ISENSE BRAKE CIOS RREF
SPEED COMP VREF SPEED
SPEED FAULT
ILIMIT
VCO/TACH
CVCO
VIEW
RVCO
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ML4425
DESCRIPTION (Pin number parenthesis TQFP package)
NAME FUNCTION NAME FUNCTION
1(30)
ISENSE
Motor current sense input. When ISENSE exceeds ILIMIT, output drivers shut fixed time determined CIOS Active output driver phase high-side switch Active output driver phase high-side switch Active output driver phase high-side switch
17(17)
capacitor sets time that controller stays align mode This output goes when drops below UVLO threshold, indicates that output drivers have been disabled capacitor sets time that controller stays ramp mode Output back-EMF sampling circuit input VCO. network connected SPEED sets compensation loop formed back-EMF sampling circuit, VCO, commutation state machine capacitor between SPEED sets ramp rate (acceleration) motor when controller ramp mode motor feedback voltage from phase monitored through resistor divider back-EMF sensing this motor feedback voltage from phase monitored through resistor divider back-EMF sensing this motor feedback voltage from phase monitored through resistor divider back-EMF sensing this logic input activates motor braking shutting highside output drivers turning low-side output drivers capacitor sets time that low-side output drivers remain after ISENSE exceeds threshold 137k resistor sets current proportional VREF that used internal bias currents except Signal power ground
18(18) FAULT
2(31) 3(32) 4(1) 5(3)
19(19)
20(20) SPEED
SPEED COMP Speed control loop compensation series resistor capacitor from SPEED COMP SPEED capacitor from sets oscillator frequency 6.9V reference voltage output Speed loop input which ranges from (stopped) VREF (maximum speed) Active high output driver phase low-side switch Active high output driver phase low-side switch Active high output driver phase low-side switch 24(24) Voltage this sets ISENSE threshold voltage ILIMIT, leaving this unconnected selects internally threshold This level output corresponds signal used clock commutation state machine. output frequency proportional motor speed when backEMF sensing loop locked onto rotor position power supply input capacitor sets voltage-to-frequency ratio resistor sets current proportional input voltage 27(27) 23(23) 21(21)
6(4) 7(5) 8(6)
22(22)
9(7) 10(8) 11(9)
12(10) ILIMIT
25(25) BRAKE
13(11) VCO/TACH
26(26)
14(12) 15(15) CVCO
16(16) RVCO
28(28)
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ML4425
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings those values beyond which device could permanently damaged. Absolute maximum ratings stress ratings only functional device operation implied. Logic Inputs SPEED BRAKE) Other Inputs Outputs -0.3V 0.3V Output Current (LA, ±50mA Junction Temperature Storage Temperature Range Lead Temperature (Soldering sec.) Thermal Resistance (JA) 28-Pin Narrow PDIP 28-Pin SOIC 32-Pin TQFP
OPERATING CONDITIONS
Temperature Range ML4425CX ML4425IX 10.8V 13.2V
ELECTRICAL CHARACTERISTICS
Unless otherwise specified,VDD 10%, RSENSE CVCO 10nF, CIOS 100pF, RREF 137k, Operating Temperature Range (Notes
SYMBOL REFERENCE VREF Total Variation Line, Temp PARAMETER CONDITIONS UNITS
OSCILLATOR Total Variation Ramp Peak Ramp Valley Ramp Charging Current SPEED CONTROL LOOP SPEED Input Voltage Range SPEED Input Voltage Range SPEED COMP Output Current SPEED Error Transconductance START-UP Charging Current Suffix Suffix Threshold Voltage Charging Current Suffix Suffix Threshold Voltage VOLTAGE CONTROLLED OSCILLATOR Frequency Range Frequency SPEED CURRENT LIMIT ISENSE Gain Shot OFF-Time V(ILIMIT) 2.5V CIOS 100pF Suffix Suffix RVCO SPEED RVCO 0.5V SPEED 1.85 Hz/V 0.68 0.68 0.98 0.98 VSPEED VSPEED VREF VREF
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ML4425
ELECTRICAL CHARACTERISTICS (Continued)
SYMBOL PARAMETER CONDITIONS UNITS LOGIC INPUTS (BRAKE) (Note Input High Voltage Input Voltage Input High Current Input Current 2.4V 0.4V
LOGIC OUTPUTS (VCO/TACH, FAULT) (Note VCO/TACH Output High Voltage VCO/TACH Output Voltage FAULT Output High Voltage IOUT -100µA IOUT 400µA IOUT -10µA Suffix Suffix FAULT Output Voltage BACK-EMF SAMPLER SPEED Align Mode Voltage SPEED Ramp Mode Current Suffix Suffix SPEED Mode Current State VPHB VDD/3 Suffix Suffix IOUT 400µA
State VPHB VDD/2 State VPHB 2VDD/3 OUTPUT DRIVERS High Side Driver Output Current High Side Driver Output High Voltage Side Driver Output Voltage Side Driver Output High Voltage -10µA V(ISENSE) Suffix Suffix
Suffix Suffix
Phase Cross-conduction Lockout Threshold SUPPLY Current UVLO Threshold Suffix Suffix UVLO Hysteresis
Note Limits guaranteed 100% testing, sampling, correlation with worst case test conditions. Note explanation states, Figure Table Note BRAKE FAULT pins each have internal resistor internal reference.
10.2 10.3
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ML4425
FUNCTIONAL DESCRIPTION
GENERAL ML4425 provides circuitry sensorless speed control 3-phase Brushless (BLDC) motors. Controller functions include start-up circuitry, back-EMF commutation control, Pulse Width Modulation (PWM) speed control, fixed OFF-time current limiting, braking, undervoltage protection. start-up circuitry aligns motor known position, then ramps motor speed generate back-EMF signal. back-EMF sampling circuit controls commutation timing forming Phase Locked Loop (PLL). commutation control circuitry also outputs speed feedback (SPEED signal used speed control loop. speed control loop consists error amplifier comparator that produce duty cycle speed regulation. Motor current limited fixed OFF-time shutdown comparator that controlled external sense resistor. Commutation control, speed control, current limiting combined produce output driver signals. output drivers used provide gating signals external phase bridge power stage sized BLDC motor voltage current requirements. Additional functions include braking function undervoltage protection circuit shut down output drivers event voltage condition ML4425. COMPONENT SELECTION Selecting external components ML4425 requires calculations based motor's electrical mechanical parameters. following list motor parameters needed these calculations motor supply voltage VMOTOR Maximum operating current IMAX Number magnetic poles Back constant (V-s/Rad) Motor torque constant (Nm/A) units) Maximum speed operation RPMMAX (RPM) Moment inertia motor load (Kg-m2) Viscous damping factor motor load
MOTOR PHASE MOTOR PHASE MOTOR PHASE SUPPLY CAPACITOR VMOTOR
more above values known, still possible pick components ML4425, some experimentation necessary determine optimal values. quantities units unless otherwise specified. following formulas should considered starting point optimization. calculations capacitors resistors should used first approximation selecting closest standard value. POWER SUPPLY REFERENCE supply voltage (VDD) nominally ±10%. 100nF bypass capacitor ground should placed close possible VDD. 6.9V voltage reference output (VREF) provided speed command current limit ML4425. 137k from RREF required reference current internal functions. OUTPUT DRIVERS output drivers provide totem pole output drive signals phase bridge power stage. control functions ML4425 translate outputs these pins. provide low-side drive signals phases phase power stage active high signals. provide high-side signals active signals.
RSENSE
Figure Using RSENSE 3-Phase Power Stage
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ML4425
FUNCTIONAL DESCRIPTION
(Continued)
FROM RSENSE ISENSE VREF ILIMIT
2.9V STOP START 30µA
CURRENT LIMITING POWER STAGE current sense resistor (RSENSE) shown Figure regulates maximum current power stage BLDC motor. Current regulation accomplished shutting output drivers fixed amount time voltage across RSENSE exceeds current limit threshold. LIMIT voltage ILIMIT sets current limit threshold. ML4425 internal voltage divider from VREF that sets default current limit threshold 2.3V (see Figure external voltage divider referenced VREF used override default ILIMIT setting. external divider should have least times current flow internal divider. SENSE function RSENSE provide voltage proportional motor current current limit trip point. default trip voltage across RSENSE 460mV, internal ILIMIT divider ratio. current sense resistor should inductance resistor such carbon composition. resistors milliohms range, wire-wound resistors tend have values inductance. RSENSE should sized handle power dissipation (IMAX2 RSENSE). ISENSE Filter ISENSE lowpass filter placed series with current sense signal shown Figure purpose this filter remove diode reverse recovery shootthrough current. This current causes voltage spike leading edge current sense signal which falsely trigger current limit. current sense voltage waveform shown before after filtering Figure recommended starting values this circuit 330pF. This gives time constant 330ns, will filter spikes shorter duration. increased much 2.2nF, should exceed time constant more than microseconds. When ISENSE exceeds ILIMIT, current limit oneshot activated, turning fixed amount time (tOFF). tOFF amount capacitance connected CIOS. CIOS usually fixed time equal less than period. 25kHz frequency, period 40µs; tOFF should between 20µs 40µs. lower limit tOFF dictated minimum time power stage; safe approximation less. equation finding CIOS capacitance value follows:
50mA 2.4V
ON/OFF
VREF
CIOS
Figure Current Sense Circuitry
460mV
Figure Current Sense Resistor Waveforms Without Filtering, With Filtering
COMMUTATION CONTROL 3-phase BLDC motor requires electronic commutation achieve rotational motion. Electronic commutation requires switching power switches 3-phase half bridge. torque production achieved direction, commutation dictated rotor position. Electronic commutation ML4425 achieved turning off, proper sequence, output from phase output from another phase. There combinations outputs (six switching states) that constitute full commutation cycle. These combinations illustrated Table Figure labeled states through This sequence programmed into commutation state machine. Clocking commutation state machine provided voltage controlled oscillator (VCO).
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ML4425
OUTPUTS STATE INPUT SAMPLING
Table Commutation State Functions
HIGH SIDE DRIVE OUTPUTS
SIDE DRIVE OUTPUTS
Figure Output Commutation Sequence Timing Diagram Cycle Full Commutation, Cycle Commutation with Duty Cycle
FUNCTIONAL DESCRIPTION
Voltage Controlled Oscillator (VCO)
(Continued) frequency corresponds maximum commutation frequency maximum motor speed when input equal slightly less than VREF. CVCO calculated using following equation: 6.5V 3101 0.05 Farad
provides compatible clock output VCO/TACH proportional input voltage SPEED pin. proportion frequency voltage (VCO constant, 80.6k resistor RVCO capacitor CVCO shown Figure RVCO sets current proportional input voltage SPEED This current used charge discharge CVCO between threshold voltages 2.3V 4.3V. resulting triangle wave CVCO corresponds clock VCO. should that output
SPEEDMAX
closest standard value that equal less than calculated CVCO should used.
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ML4425
FUNCTIONAL DESCRIPTION
fMAX 0.05 RPMMAX
(Continued)
maximum frequency found
CVCO RVCO
rotor voltage VCO/TACH equal rotor speed. voltage SPEED controlled back speed. voltage SPEED controlled back sampler. sampler.
SPEED CVCO
RVCO
BACK SAMPLER BACK SAMPLER
voltage controlled oscillator back input voltage controlled oscillator back sampler. back sense pins sampler. back sense pins inputs back sampler require signal inputs back sampler require signal from motor phase leads that below from motor phase leads that below ML4425. phase sense input impedance 8kW. This ML4425. phase sense input impedance This requires series resistor RES1 from motor phase lead requires series resistor RES1 from motor phase lead shown Figure based following equation: shown Figure based following equation: RES1 670W VMOTOR
FROM BACK SAMPLER RAMP GENERATOR VOLTAGE CONTROLLED OSCILLATOR VCO/TACH
RESET (FROM CAT)
4.3V CVCO 2.3V
back sampler takes motor phase voltages back sampler takes motor phase voltages divided down signals that less than (12V divided down signals that less than (12V nominal) calculates neutral point motor nominal) calculates neutral point motor following equation: following equation: Neutral PH1+
VCO/TACH
Figure External Component Connections
This allows ML4425 compare back signal motor's neutral point without need bringing extra wire wound motor. DELTA wound motors there physical neutral bring out, this reference point must calculated case. back sampler measures motor phase that driven (i.e. then phase driven low, phase driven high, phase
sampled). sampled phase provides back signal that compared against neutral motor. sampler controlled commutation state machine. sampled back compared neutral through error amplifier. output error amplifier outputs charging discharging current SPEED which provides control voltage VCO.
MOTOR MOTOR MOTOR
RES1 RES2 RES3
NEUTRAL SIMULATOR MULTIPLEXER SIGN CHANGER
SPEED
COMMUTATION STATE MACHINE
Figure Back Sampler Detailed Block Diagram
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ML4425
FUNCTIONAL DESCRIPTION
(Continued)
CSPEEDFB1
BACK SENSING COMMUTATION CONTROL
RSPEEDFB CSPEEDFB2 500nA BACK SAMPLER SPEED VOLTAGE CONTROLLED OSCILLATOR VCO/TACH
Three blocks form phase locked loop that locks commutation clock onto back signal: commutation state machine, voltage controlled oscillator, back sampler. complete phase locked loop illustrated Figure phased locked loop requires lead filter that external components SPEED components selected follows:
CSPEEDFB1
SPEEDFB
CSPEEDFB2
0.25
(6a)
(6b) (6c)
PHASE LOCKED LOOP
SPEEDFB1
COMMUTATION STATE MACHINE
START-UP SEQUENCE
When power first applied ML4425 motor rest, back equal zero. motor needs rotating back sampler lock onto rotor position commutate motor. ML4425 uses open loop start-up technique bring rotor from rest speed fast enough allow back sensing. Start-up comprised three modes: align mode, ramp mode, mode.
Figure Back Commutation Phase Locked Loop
Ramp Mode align mode controller goes into ramp mode. Ramp mode starts commutating through states through shown Table This ramps commutation frequency, therefore motor speed, fixed length time. This allows motor reach sufficient speed back sampler lock commutation onto motor's back EMF. amount time ML4425 stays ramp mode determined capacitor connected shown Figure charged constant 750µA current from until ramp comparator trips ramp mode. This gives fixed ramp time. calculated This gives fixed ramp follows:
Align Mode (RESET)
Before motor started, rotor must known position. When power first applied ML4425, controller reset into align mode. Align mode turns output drivers which aligns motor into position electrical degrees before center first commutation state. This shown state commutation states Table Align mode must last long enough allow motor load settle into this position. align mode time capacitor connected shown Figure charged constant 750µA current from until align comparator trips align mode. starting point calculated follows:
IMAX
align time long enough allow rotor settle reliable starting, then increase until desired performance achieved.
rate which ML4425 ramps motor speed determined fixed 500µA current source SPEED pin. current sources charges filter components causing frequency ramp During ramp mode, back sampler disabled allow control ramping only 500µA current source. ramp based SPEED filter generally fast motor keep capacitor from SPEED added slow down ramping rate. optimal ramp rate based motor load parameters adjusted varying value CRR.
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ML4425
SPEED FILTER
750nA
750nA
SPEED CVCO
RVCO
BACK SAMPLER
1.5V
1.5V
500nA VOLTAGE CONTROLLED OSCILLATOR VCO/TACH
RESET INPUT COMMUTATION STATE MACHINE
Figure ML4425 Start-up Circuitry Controlling Align Ramp Times
Mode (Back Sensing) ramp mode controller goes into mode. mode, back sensing enabled commutation under control phase locked loop. Motor speed regulated speed control loop. SPEED CONTROL Speed control accomplished setting speed command SPEED with input voltage from 6.9V (VREF). accuracy speed command determined external components RVCO CVCO. There number methods that used control speed command ML4425. potentiometer from VREF ground with wiper connected SPEED SET. SPEED controlled from microcontroller, DACs used with VREF input reference. speed command compared with sensed speed from SPEED through transconductance error amplifier. output speed error amplifier SPEED COMP. SPEED COMP clamped between diode drop above 3.9V (approximately 4.6V) diode drop below 1.7V (approximately prevent speed loop "wind-up". Speed loop compensation components connected this shown Figure speed loop compensation components calculated follows: 26.9 VMOTOR (9a) (9a) 98.696
FROM SPEED VREF
SPEED
3.9V
GATING LOGIC OUTPUT DRIVERS
SPEED COMP 1.7V
1.7V
20kHz
ON/OFF FROM ILIMIT ONE-SHOT
Figure Speed Control Loop Component Connections
voltage SPEED COMP compared with ramp oscillator create duty cycle. ramp oscillator creates sawtooth function from 1.7V 3.9V shown Figure negative clamp diode drop below 1.7V (approximately starts oscillator power frequency ramp oscillator capacitor ground CIOS selected using following equation:
50mA fPWM 2.4V
(10)
(9b) (9b)
Where ffSB speed loop bandwidth Where speed loop bandwidth
REV. 10/10/2000
Where ffPWM frequency duty Where frequency duty cycle from speed control loop gated current cycle from speed control loop gated current limit shot that controls output limit shot that controls output drivers. drivers.
ML4425
FUNCTIONAL DESCRIPTION
CROSS CONDUCTION COMPARATOR When ML4425 goes from align mode into ramp mode, there possibility cross conduction phase bridge power stage. This cross conduction happen when align mode shown state Table controller transitions state ramp mode where turned turned Cross conduction appear differences turn turn times power devices. solve this problem, output driver gated until equal shown Figure BRAKING When BRAKE pulled below 1.4V, side output drivers turned high side output drivers turned off. Braking causes rapid deceleration motor current limiting de-activated, care should taken when using BRAKE pin. BRAKE internal pullup shown Figure driven switch ground, open collector drain logic signal, logic signal. UNDERVOLTAGE LOCKOUT Undervoltage lockout used protect 3-phase bridge power stage from condition. Undervoltage triggered 9.5V less indicated output FAULT pin. Undervoltage lockout also turns output drivers (LA, HC). comparator that triggers undervoltage lockout 150mV hystresis.
(Continued)
FROM COMMUTATION STATE MACHINE
FROM SPEED CONTROL LOOP CURRENT LIMIT
GATING LOGIC OUTPUT DRIVERS
1.4V
9.5V
FAULT REFERENCE BRAKE RREF VREF
Figure Cross Conduction, Brake, UVLO Circuits
DESIGN CONSIDERATIONS
INTERFACING 3-PHASE BRIDGE POWER STAGE ML4425 output drivers configured drive phase bridge power stage. applications with buss voltages from 80V, level shifting circuitry used drive higher voltage P-channel MOSFETS high side switches shown Figure most flexible configuration high side drivers control N-Channel MOSFETs IGBTs) which allows applications from less than 600V. Figure shows interface between ML4425 IR2118 high side drivers from International Rectifier. This configuration capable driving motors from busses 320V. BRAKE pulsed prior startup with circuit. This charges bootstrap capacitors (C19, C20, C21) three high side drivers, allowing reset phase operate normally. These capacitors must sized that they stay sufficiently charged during align mode. Refer AN-43 additional applications information ML4425.
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ML4425
VBUSS 24V-80V
330µF 100V
100nF 100V
IRFR9120 2N6718 2N6718
IRFR9120 2N6718
IRFR9120
IRFR120 470m
IRFR120
IRFR120 MOTOR
2.2nF
ML4425
ISENSE SPEED COMP 100nF VREF SPEED ILIMIT VCO/TACH 100nF RREF CIOS BRAKE (RES1) SPEED FAULT RVCO CVCO 80.5k 470nF 100nF BRAKE 330pF (RES1) (RES1) 137k
Figure Driving Lower Voltage Motors 80V)
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ML4425
IR2118
100nF
MUR150
IR2118
100nF
MUR150
IR2118
100nF
MUR150
2.2µF
2.2µF
2.2µF
VBUSS 24V-80V
330µF 400V
IRF720
IRF720
IRF720
IRF720 470m
IR720
IRF720 MOTOR
2.2nF BOOTSTRAP PRE-CHARGE CAPACITOR RREF CIOS BRAKE (RES1) C13* RAMP COMP SPEED FAULT RVCO CVCO 10nF 80.6k 470nF BRAKE 330pF (RES1) (RES1) 137k
ML4425
ISENSE SPEED COMP 100nF 100nF VREF SPEED ILIMIT VCO/TACH 100nF
100nF
Figure ML4425 High Voltage Motor Drive Application Circuit
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ML4425
PHYSICAL DIMENSIONS
inches (millimeters
Package: H32-7 32-Pin 1mm) TQFP
0.354 (9.00 BSC) 0.276 (7.00 BSC) 0.003 0.008 (0.09 0.20)
0.276 (7.00 BSC) 0.354 (9.00 BSC)
0.018 0.030 (0.45 0.75)
0.032 (0.8 BSC) 0.012 0.018 (0.29 0.45) 0.048 (1.20 MAX) 0.037 0.041 (0.95 1.05) SEATING PLANE
Package: P28N 28-Pin Narrow PDIP
1.355 1.365 (34.42 34.67)
0.280 0.296 0.299 0.325 (7.11 7.52) (7.60 8.26)
0.045 0.055 (1.14 1.40) 0.100 (2.54 BSC) 0.020 (0.51 MIN)
0.180 (4.57 MAX)
0.125 0.135 (3.18 3.43)
0.015 0.021 (0.38 0.53)
SEATING PLANE
0.008 0.012 (0.20 0.31)
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ML4425
PHYSICAL DIMENSIONS
inches (millimeters)
Package: 28-Pin SOIC
0.699 0.713 (17.75 18.11)
0.291 0.301 0.398 0.412 (7.39 7.65) (10.11 10.47)
0.024 0.034 (0.61 0.86) PLACES) 0.050 (1.27 BSC) 0.095 0.107 (2.41 2.72)
0.090 0.094 (2.28 2.39)
0.012 0.020 (0.30 0.51)
SEATING PLANE
0.005 0.013 (0.13 0.33)
0.022 0.042 (0.56 1.07)
0.009 0.013 (0.22 0.33)
ORDERING INFORMATION
PART NUMBER ML4425CP ML4425CS ML4425CH (Obsolete) ML4425IP ML4425IS ML4425IH (Obsolete) TEMPERATURE RANGE PACKAGE 28-Pin PDIP (P28N) 28-Pin SOIC (S28) 32-Pin TQFP (H32-7) 28-Pin PDIP (P28N) 28-Pin SOIC (S28) 32-Pin TQFP (H32-7)
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES RIGHT MAKE CHANGES WITHOUT FURTHER NOTICE PRODUCTS HEREIN IMPROVE RELIABILITY, FUNCTION DESIGN. FAIRCHILD DOES ASSUME LIABILITY ARISING APPLICATION PRODUCT CIRCUIT DESCRIBED HEREIN; NEITHER DOES CONVEY LICENSE UNDER PATENT RIGHTS, RIGHTS OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT FAIRCHILD SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user. www.fairchildsemi.com critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
2000 Fairchild Semiconductor Corporation
REV. 10/10/2000

ML4425 motor controller provides functions necessary starting controll

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