www.fairchildsemi.com
FAN8460MTC/FAN8460MP
Single Phase Full Wave BLDC Motor Driver with
Variable Speed Control
Features
Description
• Output direct PWM drive for speed control
• Selectable PWM frequency : internal or external
• Versatile speed control inputs: A thermistor or PWM
input.
• A wide range of operating voltage: 3.2V to 28V
• Locked rotor protection with open collector output and
auto retry
• Open collector hall output for speed feedback
• Adjustable minimum speed
• Thermistor disconnection protection
• TSD protection.
The FAN8460MTC/FAN8460MP is a single phase BLDC
motor driver with variable speed control using output direct
PWM method and it’s typical application is DC cooling fans
with wide range of supply voltage(5/12/24V). This approach
eliminates the need for external pass devices such as BJT,
MOSFET. This solution also offers other advantages over
commonly used external PWM turning fan’s power on and
off at fixed frequency. The external PWM increas stress on
fan and needs level translation in speed and alarm output
because these outputs share the fan’s negative terminal.
In case of CPU cooling, digital controller can give speed
control command with PWM signal adjusting the duty. If a
system has no digital controller, the NTC thermistor input
mechanism can control fan speed with local or ambient temperature sensing.These two kinds of input schemes can meet
various system requirements and applications.
14-TSSOP
14-MLP 4X4
Typical Applications
• CPU Cooling Fans
• Instrumentation Fans
• Desktop PC Fans
Ordering Information
Device
Package
Operating Temp.
FAN8460MTC
14-TSSOP
−30°C ~ 90°C
FAN8460MTCX
14-TSSOP
−30°C ~ 90°C
FAN8460MPX
14-MLP 4x4
−30°C ~ 90°C
Rev.1.0.3
©2004 Fairchild Semiconductor Corporation
FAN8460MTC/FAN8460MP
Block Diagram
9
VM
6
OUTA
8
OUTB
TACO
14
AL
13
H+
2
H-
1
Commutation
&
Control
&
TSD
PWM
10
Lock
Detection
&
Auto
Restart
VS
7
GND
12
CT
LD
3
VLDCP
VLDCL
Triangle
Wave
Generator
Switching
Control
VS
2V
Reference
PWM
SPWM
Decoder
IPWM
VPWM
5
2
VCON VREF
11
4
FAN8460MTC/FAN8460MP
Pin Definitions
Pin Number
Pin Name
I/O
Pin Function Description
Remark
1
H−
A
Hall input -
2
H+
A
Hall input +
-
3
LD
A
Sawtooth wave generator for lock detector
and automatic restart
-
4
VREF
A
Reference voltage output
5
VPWM
I
PWM input for speed control
-
6
OUTA
A
Motor output A
-
7
GND
P
Ground
-
8
OUTB
A
Motor output B
-
9
VM
P
Power supply for output stage
-
10
VS
P
Power supply for signal block
11
VCON
A
Speed control signal
12
CT
A
Triangle waveform out
13
AL
O
Alarm output
Open collector
14
TACO
O
Speed output
Open collector
-
3
FAN8460MTC/FAN8460MP
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Maximum power supply voltage
Symbol
Value
VSMAX, VMMAX
32
Unit
V
143 (FAN8460MTC)
Thermal resistance
Rja
150 (FAN8460MP case1)
45 (FAN8460MP case2)
o
C/W
oC/W
o
C/W
870 (FAN8460MTC)
mW
800 (FAN8460MP case1)
mW
2700 (FAN8460MP case2)
mW
VOMAX
36
V
IOMAX
0.8note
A
IOPEAK
1.2note
A
Maximum Taco/Alarm output current
ITACO/AL
5
mA
Taco/Alarm output sustain voltage
VTACO/AL
36
V
VHO
36
V
VVPWM
-0.3~ VS
V
Operating temperature
TOPR
−30 ~ 90
°C
Storage temperature
TSTG
−55 ~ 150
°C
Maximum power dissipation
PDMAX
Maximum output voltage
Maximum output current
Maximum output peak current
Hall output withstanding voltage
VPWM Input voltage
Case 1
Case 2
Remark
Power
plane(Cu)
Pd is measured
base on the JEDEC/STD(JESD
51-2)
GND
plane(Cu)
PCB(glass-epoxy)
Pd= 0.8W
Via
Pd= 2.7W
note :
1. Refer: EIA/JESD 51-2 & EIA/JESD 51-3 & EIA/JESD 51-5 & EIA/JESD 51-7
2. Case 1: Single layer PCB with 1 signal plane only, PCB size 76mm × 114mm × 1.6mm.
3. Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes, PCB size 76mm × 114mm × 1.6mm, Cu plane sizes for
power and ground 74mm × 74mm × 0.035mm, thermal via hole pitch 0.9mm, via hole φ size 0.3mm, 6 via hole.
4. Should not exceed PD or ASO value.
5. IOPEAK time is within 2us.
4
FAN8460MTC/FAN8460MP
Power Dissipation Curve
Pd [mW]
3,000
case2
2,000
SOA
14TSSOP
1,000
0
0
case1
25
50
75
100
125
150
175
Ambient Temperature, Ta [°C]
Recommended Operating Conditions (Ta = 25°C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Supply voltage for signal block
VS
3.2
−
28
V
Supply voltage for output stage
VM
3.2
−
28
V
5
FAN8460MTC/FAN8460MP
Equivalent Circuits
Description
Pin No.
Internal Circuit
VCC
Hall input
1,2
1
2
VCC
LD
3
3
VM
Output
6,8
6
8
13
14
AL/TACO
6
13 , 14
FAN8460MTC/FAN8460MP
Equivalent Circuits
Description
Pin No.
Internal Circuit
Reference
VPWM
5
5
VCC
VCON/CT
11/12
11
12
7
FAN8460MTC/FAN8460MP
FAN8460MTC/FAN8460MP Electrical Characteristics
(Ta = 25°C, VS = 12V unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
-
4.5
7
mA
Common Block
Supply current
ICC
Reference output voltage
VREF1
Iref=200uA
1.85
2.0
2.15
V
Reference output voltage
VREF2
Iref=2mA
1.75
1.94
2.13
V
Lock Detector & Auto Restart
LD charging current
ILDC
VLD=0V-->1.5V ,VLD=1.5V
1.4
2.2
2.9
µA
LD discharging current
ILDD
VLD=3V-->1.5V ,VLD=1.5V
0.15
0.33
0.50
µA
LD clamp voltage
VLDCL
-
2.3
2.6
2.9
V
LD comparator voltage
VLDCP
-
0.4
0.6
0.8
V
CT discharging current
ICTD
VCT=2.0V-->1.2V,VCT=1.2V
-7.2
-6
-4.8
µA
CT charging current
ICTC
VCT=0.5V-->1.2V,VCT=1.2V
4.8
6
7.2
µA
CT valley voltage
VCTMIN
-
0.71
0.8
0.89
V
CT peak voltage
VCTMAX
-
1.7
1.8
1.9
V
VCON output current
IVCON
VVCON=2V, PWM=H
180
200
220
µA
Output OFF VCON low voltage
VCONL
-
-
300
mV
-
0.5
V
2.8
-
-
V
-
70
100
µA
-
0.9
1.1
V
0.2
0.3
V
Triangle Wave Generator
Speed Control Voltage
VPWM Input
VPWM low Voltage
VPWML
VPWM high Voltage
VPWMH
VPWM input current
IPWML
VVPWM=5V
Output Stage
High side output saturation voltage
VOSH
IO=200mA
Low side output saturation voltage
VOSL
IO=200mA
Speed output (TACO) & Lock Detection Output (AL)
TACO output saturation voltage
VTACOS
ITACO=5mA
-
0.1
0.3
V
TACO output leakage current
ITACO
VTACO=12V
-
0.1
10
µA
AL output saturation voltage
VALS
IAL=5mA
-
0.1
0.3
V
IAL
VAL=12V
-
0.1
10
µA
AL output leakage current
Hall Amplifier
8
Input range
VHDC
-
0
-
VS-2.8
V
Input offset
VHOF
-
-10
-
10
mV
FAN8460MTC/FAN8460MP
Application Information
1 Direct output PWM for FAN Motor Speed Control
Direct output PWM method is used to control driving power to a fan motor and thus fan motor speed. A motor current, and
thus fan motor speed is proportional to duty-cycle of output PWM signal in FAN8460MTC/FAN8460MP. The internal PWM
signal is driven by comparing a triangle wave (PWM oscillator output, VCT) and a control DC voltage VVCON). Figure.1
illustrates the relationships among oscillator output (VCT), speed control voltage (VVCON), motor current, and output PWM
duty.
VCT
VVCON
iM
VCT
1.8V
VVCON
0.8V
iM(avg)
ifreewheeling
iM
tPWM
tON
PWM
tOFF
High Speed
Mid Speed
Low Speed
Figure 1. Basic Speed Control Concept
.
Output PWM(Duty)
100%
50%
0
0.8V
1.3V
1.8V
2V
Speed Control Voltage(VVCON)
Figure 2. The Relationship Between Speed Control Voltage and Output PWM Duty
As shown in figure2, the output PWM duty-cycle can be decreased as VVCON is increased. The effective range of speed control voltage (VVCON) is 0.8 ~1.8V(typical) which represents a duty-cycle range of 0% to 100% on PWM signal.When
VVCON is 1.3V, the output PWM duty becomes 50%.
2 H-bridge motor driver (OUTA, OUTB)
Using an H-bridge to drive a single-phase BLDC motor provides several advantages for DC fans over a two phase motor commonly driven by two commutated low-side switches. A single phase motor has only two connections; hence, the H-bridge
topology requires only two output terminals and two traces are needed on the fan PCB. Generally, this H-bridge method with
single phase motor increases fan motor torque density over a typical unipolar drive method. In addition, the H-bridge topology
eliminates the number of external component for snubbing and allows recirculation of winding current to maintain energy in a
9
FAN8460MTC/FAN8460MP
motor while PWM switching occurs. PWM occurs on the high side, and the freewheeling current flow on the low side during
TOFF.
3 Triangle Waveform Generator (PWM Oscillator)
The PWM oscillator output (VCT) sets output PWM frequency using external capacitor (CT). When VCT reaches the upper
threshold(1.8V typical) by internal current source(6uA typical), CT begins to be discharged by internal current sink(-6uA typical) until the low threshold(0.8V typical). It repeats the charging and discharging cycle. To have a desired PWM frequency,
fCT, can be calculated as follows;
I CTC
C T = --------------------------------------------------------------------2f CT × ( V CTMAX – V CTMIN )
For example, CT = 100pF, then fCT is about 25KHz.
4. Speed Control Voltage (VVCON) and Active Filter (PWM Decoder)
In general, many PC super IO and hardware monitoring ICs provide one of two fan speed control output to provide variable
fan speed control without an external drive power stage. FAN8460MTC/FAN8460MP have two type of input stage scheme.
This means an end user can control the fan speed with a PWM signal or a DC control voltage (typically thermistor input). Figure.3 shows two kind of input stages; ambient temperature based input stage using thermistor(figure.3a) and digital PWM
input stage(figure.3b).
100pF
12
CT
VS
PWM
Decoder
VPWM
2V
Reference
VCON
5
100pF
11
VREF
12
CT
VS
PWM
Decoder
VPWM
4
2V
Reference
VCON
5
11
VREF
4
6.2K
RMIN
RPWM
RNTC
ROPT
120K
CPWM
RPWM
Figure 3. Input Stages and Speed Control Voltage Output
4.1 NTC Thermistor based Speed Control(Scheme 1)
When the ambient temperature based speed control is used, the VPWM pin must be connected with ground as shown figure.3a. The VVCON will be adjusted automatically by ambient temperature with NTC thermistor. When the ambient temperature increases, decreased thermistor resistance results in low VVCON and high fan motor speed. An optional resistor, RMIN, is
set to a minimum speed when thermistor is accidentally disconnected.
The VVCON is calculated as follows;
( R MIN || R NTC )
V VCON = -------------------------------------------------------------- × V VREF
( R MIN || R NTC ) + R PWM
For example, RPWM = 3K, RMIN =open, RNTC=10K, the VVCON is shown in fig4.a. When the temperature is higher than
65, motor will run at full speed. In case, the temperature is under 5°C, no drive will be present. But the practical motor stop
temperature is slightly higher than 5°C because motor needs minimum starting torque depending on mechanics, motor size. In
case, the RMIN is not used, fan motor runs at full speed when the thermistor is accidentally disconnected.
Another example is useage of optinal resistor RMIN to limit minimum motor speed. For example, RPWM = 1.5K, RMIN =
3.3K, RNTC=10K, fig4.b shows the resultant VCON voltage is under 1.3V and thus the minimum PWM duty will be over 0.5.
It means motor will runs at medium speed even if NTC is disconnected accidentally.
10
FAN8460MTC/FAN8460MP
1.6
28
1.4
24
1.2
20
1
16
0.8
12
0.6
8
0.4
4
0.2
10 20 30 40
30
40
0
0
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
10
20
0
40
36
32
28
24
20
16
12
8
4
0
50 60 70 80 90 100
90
10
0
32
VCON voltage
70
80
1.8
50
60
36
VCON voltage[V]
2
10K NTC[K ohm]
40
Equivalent Resistance
VCON voltage[V]
10KNTC
VCONvoltage
10K NTC[Kohm
10KohmNTC
temperature[°C]
temperature[°C]
Figure 4. Sensed temperature and speed control voltage
4.2 PWM Speed Control using Internal Oscillator(Scheme 2)
A digital PWM input applied to VPWM pin is converted to analog DC voltage by PWM decoder and external RC filter. The
external filter capacitor, CPWM, eliminates high frequency AC component in VVCON. If a large value of CPWM is used,
VVCON has smaller value of AC component (ripple), but larger time delay can be occurred in VVCON with some fixed input
frequency. The lower frequency of digital PWM input needs the larger value of CPWM. External resistor RPWM, RPWM
define the VVCON range as follow;
R OPT
V VCON ( ON ) = { V REF – ( R PWM × I VCON ) } × ------------------------------R OPT + R PWM
V VCON ( OFF ) = V VREF × R OPT ⁄ ( R PWM + R OPT )
VVCON(V)
Output PWM(Duty)
1.9V
1.8V
100%
50%
0%
0.8V
0.72V
0
8%
50%
92% 100%
Digital VPWM Input Duty
0
8%
50%
88% 100%
Digital VPWM Input Duty
Figure 5. The Relationship Digital PWM Input Duty VS VVCON and Output PWM Duty
For example, RPWM =6.2K and ROPT =120K, VVCON become between 0.72V and 1.9V, because VVREF=2V, IVOCN =
200uA. For some design margin, under the 8% duty of digital PWM input, fan motor stops because the output PWM duty is 0.
If the duty of digital PWM input is lager than 0.92, then output PWM duty is 100%. It means fan motor is operated in full
speed. Figure5.a shows the relationship between digital PWM input and active filter out (VVCON) and figure5.b illustrates the
11
FAN8460MTC/FAN8460MP
output PWM duty is proportional to input PWM duty with some dead band. The output PWM frequency is defined by external
capacitor, CT. So there is no relationship between VPWM input frequency and output PWM frequency. Table 1 summarizes
the motor speed according to digital VPWM input and VVCON
Table 1. .Operation Tables
Mode
VPWM
VCON
Speed Condition
H
L
Full Speed
L
H
Stop
H/L
Depend on mother board PWM signal
proportional to PWM input duty
GND
Depend on thermistor resistance
The higher TEMP, the faster fan speed
PWM Input
Thermistor Input
4.3 PWM Speed Control using External PWM Input(Scheme 3)
This scheme indicates that digital PWM input signal becomes directly output PWM signal. In other word, frequency and duty
of output PWM driving signal is the same as this digital PWM input. In case input PWM frequency is very low, active filter
needs large value of capacitor to make speed control voltage in scheme 2. This scheme dosen’t need filter capacitor and has
good input/output characteristics. This means that there is no deadband and output signals are synchronized with input VPWM
signal as shown in figure6.
CT
VCC
12
180K
PWM
Decoder
2V
Reference
VPWM
VCON
5
11
4
6.2K
20K
VREF
HH+
VPWM
OUTA
OUTB
RPWM
Figure 6. Interface and it’s Related Waveforms Scheme3
4.4 Offset comparator(Thermistor open protection)
If under 100mV difference between VREF and VCON, fan motor runs at full speed.
5 Locked Rotor Protection with Open Collector Output and Automatic Restart
When the rotor is locked, there is no change in input signal of hall amplifier and thus a internal TZERO pulse is not observed.
A capacitor (CLD) connected LD pin is continually charged by internal current source (iLDC) to the internal threshold
(VLDCL) resulting from no Tzero pulse. When the voltage, VCLD on LD pin, reaches VLDCL, high side output power TR is
turned-off to protect motor during TOFF and the alarm output (AL) becomes floating high. When the VCLD reaches upper
threshold, VLDCL, VCLD starts to decrease with internal current sink (iLDD) to the low threshold, VLDCP. At that time, the
VCLD ramps up again and one of two outputs is turned on depending on locked rotor position during TON. The charging and
discharging repeat until locked condition is removed, or FAN8460MTC/FAN8460MP is powered down. The overall time chart
is shown in figure.6. The auto- retry time (TON), the motor protection time (TOFF) and the locked rotor detection time
(TLOCK) are proportional to external capacitor, CLD. Each value can be calculated as follows;
12
FAN8460MTC/FAN8460MP
C LD × ( V LDCL – V LDCP )
T ON = -------------------------------------------------------i LDC
C LD × ( V LDCL – V LDCP )
T OFF = -------------------------------------------------------i LDD
C LD × V LDCL
T LOCK = ----------------------------i LDC
For example, CLD = 0.33uF, then TON= 0.3Sec,TOFF= 2Sec,TLOCK=0.4Sec. This AL output can be used to inform a locked
rotor condition to super IO or system controller. Because the AL output is open collector type, end user can pull up this pin
with a external resistor to the supply voltage of their choice (that is 5 or 3.3V).
Rotor
HH+
NSNSNSN
N
TOFF
SNSNSNS
TON
VLDCL
VLDCP
LD
Tzero
OUTB
OUTA
Tlock
AL
TACO
1 rotation
Motor
Locked
Lock
Released
Figure 7. Overall Timing Chart
13
FAN8460MTC/FAN8460MP
6. Hall Sensor Amplifier
V+
RH
C H1
H+
2
C H2
FAN8460MTC
FAN8460MP
Ri
1
H-
Hall
Sensor
Figure 1. Hall Sensor Interface
The hall current (IH) is determined as follows;
V CC
I H = -------------------------(RH + Ri)
Where, RH is an external limiting resistor and Ri is input impedance of hall sensor. An external capacitor, CH1, can be used to
reduce a power supply noise. CH2 can reduce the instant peak current using H-bridge’s commutation. The input range of hall
amplifier is between 0V and VCC-2.8V as shown in following figure.
VS
V S - 2 .8 V
VS / 2
GND
Figure 2. Hall Amplifier Input Range
Table 1. Hall Sensor Outputs and Related Pin outputs
(H+) -( H-)
LD
OUT A
OUT B
AL
TACO
Positive
Low Level
L
PWM
L
L
Negative
Low Level
PWM
L
L
H
ROTATING
-
-
-
-
H
L or H
LOCK
Remark
7 Open Collector TACO Output for Speed Feedback
The TACO output comes from the hall amplifier output. Because the TACO output is open collector type, end user can pull up
this pin with a external resistor to the supply voltage of their choice (that is 5 or 3.3V). This resulting output signal has two
pulses per revolution on a four pole motor.
9 Supply Voltage Consideration
A supply sustain capacitor (CR) should be placed as close to VM pin with GND as layout permits. A reverse supply protection
diode (DR) prevent motor current from recirculating to power source when PWM operation and phase commutation occur.
This results in increasing VM and VS pin voltage. This capacitor absorbs motor recirculating current and limits VM and VCC
pin voltage. In general, large motor winding inductance and current need large value of CR.
9. Thermal Shutdown
TSD on: Two high side output TR are off.(Typ. 175°C)
TSD off: The circuit can be reactivated and begin to operate in a normal condition. (Typ. 150°C)
14
FAN8460MTC/FAN8460MP
Typical Application Circuits 1 (NTC Thermistor based Speed Control)
V+
DR
9
VM
CR
eletrolytic
6
OUTA
8
OUTB
14
AL
13
Commutation
&
Control
&
TSD
> 0.47uF
R1
TACO
R2
V+
RH
2
H-
1
Hall
H+
PWM
10
Lock
Detection
&
Auto
Restart
VS
7
GND
12
CT
CT
100pF
LD
3
CLD
VLDCP
VLDCL
Triangle
Wave
Generator
VS
2V
Reference
PWM
SPWM
Decoder
Switching
Control
IPWM
VPWM
VCON VREF
5
11
RNTC
4
RPWM
Mode
VPWM
VCON
Speed Condition
Thermistor Input
GND
Depend on thermistor resistance
The higher TEMP, the faster fan speed
15
FAN8460MTC/FAN8460MP
Typical Application Circuits 2 (PWM Input Speed Control using Internal Oscillator)
V+
DR
9
VM
CR
eletrolytic
6
OUTA
8
OUTB
14
AL
13
Commutation
&
Control
&
TSD
> 0.47uF
R1
TACO
R2
V+
RH
2
H-
1
Hall
H+
PWM
10
VS
7
GND
12
CT
CT
100pF
Lock
Detection
&
Auto
Restart
LD
3
CLD
VLDCP
VLDCL
Triangle
Wave
Generator
Switching
Control
VS
2V
Reference
PWM
SPWM
Decoder
IPWM
VPWM
VCON VREF
5
11
4
6.2K
ROPT
120K
Mode
PWM Input
16
CPWM
RPWM
VPWM
VCON
Speed Condition
H
L
Full Speed
L
H
Stop
L/H
H/L
proportional to PWM duty (Duty range:0.15 ~ 0.85)
FAN8460MTC/FAN8460MP
Typical Application Circuits 3 (PWM Input Speed Control using External PWM Input )
V+
DR
9
CR
VM
eletrolytic
6
OUTA
8
OUTB
14
AL
13
Commutation
&
Control
&
TSD
> 0.47uF
R1
TACO
R2
V+
RH
2
H-
1
Hall
H+
PWM
10
Lock
Detection
&
Auto
Restart
VS
7
GND
12
CT
LD
3
CLD
VLDCP
VLDCL
180K
Triangle
Wave
Generator
Switching
Control
VS
2V
Reference
PWM
SPWM
Decoder
IPWM
VPWM
VCON VREF
5
11
4
6.2K
20K
Mode
PWM Input
RPWM
VPWM
VCON
Speed Condition
H
L
Full speed
L
H
Stop
H/L
L/H
proportional to PWM Duty
17
FAN8460MTC/FAN8460MP
Package Dimensions (Unit: mm)
14-TSSOP
18
FAN8460MTC/FAN8460MP
Package Dimensions (Unit: mm)
14-MLP 4X4
19
FAN8460MTC/FAN8460MP
Typical Performance characreristics
VREF load regulation
VS current consumption
2.05
2.00
1.95
VREF[v]
ICC[mA]
5
4
VS=12V
1.90
1.85
3
0
5
10
15
20
25
1.80
30
0
1
2
VS[V]
3
4
5
IREF[mA]
VREF line regulation
IVCON line regulation
2.0
210
1.9
IVCON[uA]
VREF[V]
IREF=200uA
1.8
1.7
200
1.6
1.5
190
0
5
10
15
20
25
30
0
5
10
VS[V]
15
20
25
Low side TR saturation voltage
High side TR saturation voltage
2.5
2.0
24V at 57ohm
Supply voltage[V]
VCE[V]
20
VS=VM=12V
1.0
0.5
5V
12V
24V
5V
12V
24V
5V at 13ohm
12V at 26ohm
25
1.5
30
VS[V]
Falling time
Falling time
Falling time
Rising time
Rising time
Rising time
15
10
5
0.0
0.0
0.1
0.2
0.3
0.4
Motor current[A]
0.5
0.6
0.7
0
0
200
400
600
Time[ns]
20
800
1000
FAN8460MTC/FAN8460MP
21
FAN8460MTC/FAN8460MP
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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2002 Fairchild Semiconductor Corporation