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FAN7554
Versatile PWM Controller
Features
* * * * * * * * * * * * * * * Current mode control Pulse by pulse current limiting Low external components Under voltage lockout(UVLO): 9V/15V Stand-by current: typ. 100uA Power saving mode current: typ. 200uA Operating current: typ. 7mA Soft start On/off control Over load protection(OLP) Over voltage protection(OVP) Over current protection(OCP) Over current limit(OCL) Operating frequency up to 500kHz 1A totem-pole output current
Description
The FAN7554 is a fixed frequency current mode PWM controller. It is specially designed for off-line and DC to DC converter applications with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, an ON/OFF control, a high gain error amplifier, a current sensing comparator, and a high current totem-pole output. The FAN7554 has various protection functions such as an over load protection, an over current protection, and the over voltage protection, which include built-in auto restart circuit. The FAN7554 is available in the 8-DIP package as well as the 8-SOP package.
8-DIP
Applications
* Off-Line & DC-DC converter
8-SOP
1
1
Rev. 1.0.3
(c)2003 Fairchild Semiconductor Corporation
FAN7554
Internal Block Diagram
Rt/Ct 4
3.5V + _ _ S Q R off PWR / SAVE
Vref 8
+ 34V + _ + _ _ _ OVP
Vcc 7
Vref 100uA + _
UVLO Vref
S/S
2
1k + 0.3V 1.5V
on
15V/9V
OSC CLK PWM + _ S Q R 14V
FB
1
1mA
Absolute Maximum Ratings
( Ta = 25C, unless otherwise specified ) Parameter Supply voltage Output current Input voltage to FB pin Input voltage to IS pin Power dissipation at TA 25C 8-DIP 8-SOP Operating temperature Storage temperature Thermal resistance, junction-to-air (Note1) 8-DIP 8-SOP Symbol Vcc IO VFB VIS PD TOPR TSTG Rja Value 30 1 -0.3 to VSD -0.3 to VOC 0.85 0.42 -25 to +85 -55 to +150 147.8 291.4 Unit V A V V W C C C/W
Note: 1. Junction -to -air thermal resistance test environments. - JESD51-2 : Integrated circuits thermal test method environmental conditions-natural convection (still air). - JESD51-3 : Low effective thermal conductivity test board for leaded surface mount packages. - JESD51-10 : Test boards for through-hole perimeter leaded package thermal measurements.
2
_
6V
+ +
_
MAX. 1V 2R R
6
OUT
Vref Vcc 5uA OLP OVP-out OCL-out
Offset(0.1V)
3
OCL S R UVLO-out Q 2V
IS
5 GND
FAN7554
Temperature Characteristics
( -25C Ta 85C ) Parameter Vref temperature stability Fosc temperature stability Symbol VREF3 FOSC2 Value 0.5 5 Unit % %
PIN Array
Vref Vcc OUT GND
8
7
6
5
YWW FA N7554
1
FB
2
S/S
3
IS
4
Rt/Ct
PIN Definitions
Pin Number 1 2 3 4 5 6 7 8 Pin Name FB S/S IS Rt/Ct GND OUT Vcc Vref Soft start Non-inverting(+) input of PWM comparator, OCL sensing terminal Oscillator time constant(Rt/Ct) Ground Output of gate driver Power supply Output of 5V reference Pin Function Description Inverting(-) input of pwm comparator, on/off control & OLP sensing terminal.
3
FAN7554
Electrical Characteristics
(Ta = 25C, Vcc=16V, Rt=10k, Ct=3.3nF unless otherwise specified) Parameter < REFERENCE SECTION > Reference output voltage Line regulation Load regulation Short circuit output current < OSCILLATOR SECTION > Oscillation frequency Frequency change with Vcc Ramp high voltage Ramp low voltage Discharge current < PWM SECTION > Sense threshold voltage Feedback threshold voltage Feedback source current Max. duty cycle Min. duty cycle < PROTECTION SECTION > Shutdown delay current Shutdown feedback voltage Over current protection Over voltage protection < ON/OFF CONTROL SECTION > Off mode sink current Off threshold voltage < SOFT-START SECTION > Soft start current Soft start limit voltage Low output voltage1 High output voltage1 Low output voltage2 High output voltage2 Rising time (Note1) Falling time (Note1) Start threshold voltage Min. operating voltage VTH(ST) VOPR(M) 13.2 8.2 15 9 16.2 10.2 V V VOL1 VOH1 VOL2 VOH2 tR tF VCC = 18V, IO = 50mA VCC = 18V, IO = -50mA VCC = 18V, IO = 200mA Vcc = 18V, Io = -200mA Tj = 25C, CL = 1nF Tj = 25C, CL = 1nF 13 12 0.15 15 1.5 14 80 40 0.4 17 2.5 16 V V V V ns ns IS/S VLIM(S/S) VFB = 5V, VS/S = 0V Vcc = 16V 1.1 5.2 mA V ISINK VOFF VFB < VTH(FB), VS/S = 5V VFB < VTH(FB) 1.2 4 1.5 1.8 mA V ISD VSD VOC VOVP 4V VFB VSD VFB > 5V VIS > 1.5V, ton > 500nS 3.5 5.4 1.6 30 5 6 2 34 6.5 6.6 2.4 38 uA V V V VTH(IS) VTH(FB) IFB D(MAX) D(MIN) VFB = 5V VIS = 0V VFB = 0V, VS/S = 5V 0.8 0.2 92 1.0 0.3 1.0 95 1.2 0.4 98 0 V V mA % % FOSC FOSC1 VRH VRL Idisch Tj = 25C Vcc = 12V ~ 25V VRT/CT = 3.3V 45 6.1 50 0.05 2.8 1.2 55 1.0 9.4 kHz % V V mA VREF VREF1 VREF2 ISC Tj =25C , Iref =1mA Vcc =12V ~ 25V Iref =1mA ~ 20mA Tj = 25C 4.90 5.00 6 6 0.1 5.10 20 25 0.18 V mV mV A Symbol Conditions Min. Typ. Max. Unit
4
FAN7554
Electrical Characteristics (Continued)
(Ta = 25C, Vcc=16V, Rt =10k, Ct = 3.3nF unless otherwise specified) Parameter Start-up current Operating supply current Off State current Symbol IST IOP IOFF Conditions VFB
Note: 1. These parameters, although guaranteed, are not 100% tested in production.
5
FAN7554
Typical Perfomance Characteristics
[ Rt vs. Freqency ] 10000.0
100.000 [ Ct vs Dead time ]
1000.0
Dead Time [usec]
Frequency[kHz]
100.0
10.0
0.33n 1.1n 3.3n 11n 33n
10.000 1K 2K 5K 10K 20K 50K 100K
1.000
1.0
0.1 1 10 Rt[Kohm] 100
0.100 0.1 1 Ct[nF] 10 100
Figure 1. Rt vs. Frequency
[ Ct vs Duty ]
800
Figure 2. Ct vs. Dead Time
[ Cload vs Tr & Tf ] 50Khz,95% duty
95.0
700
85.0 75.0 Duty [%] 65.0 55.0 45.0 35.0 25.0 15.0 0.1 1 Ct [nF] 10 100 1K 2K 5K 10K 20K 50K 100K
600 Time [nsec] 500 400 300 200 100 0 1 10 Cload [ nF] 100 Tr Tf
Figure 3. Ct vs. Duty
Figure 4. Cload vs. Tr & Tf
6
FAN7554
Typical Performance Characteristics(Continued)
Figure 5. Temperature vs. Start-up Current
Figure 6. Temperature vs. Operating Supply Current
Figure 7. Temperature vs. Reference Voltage
Figure 8. Temperature vs. Oscillation frequency
Figure 9. Temperature vs. Start Threshold Voltage
Figure 10. Temperature vs. Min. Operating Voltage
7
FAN7554
Operation Description
The FAN7554 has all the basic features of the current mode SMPS control IC. Its basic configuration includes the UVLO with 6V hysteresis, a band gap reference, the oscillator that can oscillate up to 500kHz according to Rt/Ct (connected externally), a PWM logic circuit , a gate driver, and the feedback circuit that has the current source and soft start function. The FAN7554 has various functions such as an over load protection, an over current protection, and an over voltage protection. The over load protection forces the FAN7554 to stop its operation if the load current is higher than the preset value. The protection circuit can also be prevented from operating during transient states by ensuring that a certain amount of the time passes before the protection circuit operates. The shutdown circuit is configured for an auto-restart, so the FAN7554 automatically restarts when Vcc drops to 9V (stop voltage).
Start-Up
The start-up circuit is made up of an under voltage lock out (UVLO), the protection for low voltage conditions, and the 5V reference (Vref), which supplies bias voltage to the control circuit after start-up. The start voltage of the UVLO is 15V , and the stop voltage after turn on is 9V. It has a 6V hysteresis. The minimum operating current for start-up threshold is typically 100uA, and this can reduce the power dissipation on the start-up resistor. The Vref is composed of the band gap reference circuit with its superior temperature characteristics and supplies power to all the FAN7554 circuits and Rt/Ct, with the exceptions of the ULVO circuit and ON/OFF control circuit.
DC Link
Icc(mA)
7
VCC UVLO 5V Vref Internal bias Good logic
7.0
15V/9V FAN7554
0.01 9 15
Vcc (V)
Figure 11. Low Current Start-Up & Bandgap Reference Circuit
Figure 12. Start-Up & Circuit Characteristics
Soft Start
The SMPS output load usually contains a capacitive load component. During initial start-up, the output voltage increases at a fixed time constant because of this component. If the feedback loop, which controls the output voltage, was to start without the soft start circuit, the feedback loop would appear to be open during initial start-up , so, at start-up, the feedback voltage applied to the PWM comparator's inverting input (-) reaches its maximum value(1V). During this time, the peak value of the drain current would stay at the maximum value, and the maximum power would be delivered to the secondary load side from the start. When the maximum power is delivered to the secondary side for this initial fixed time, the entire circuit is seriously stressed. The use of a soft start can avoid such stresses. At start-up, the soft start capacitor Cs is charged by 1mA and 100uA current sources. The voltage of the inverting terminal of the PWM comparator increases to 1/3 of the Cs voltage at a fixed time constant. Subsequently, the drain peak current is limited by the gradual increase in the Cs voltage and this causes the output voltage to increase smoothly. When the Cs voltage becomes greater than 3V, the diode Ds turns off consequently, the feedback capacitor Cfb is charged by 1mA and 5uA current sources. This charge voltage determines the comparator's inverting voltage. Then, Cs voltage charges to 5V by 100uA current source. The soft start capacitor Cs is discharged when the UVLO good logic starts, so the soft start is repeated at re-start.
8
FAN7554
S/S 2
100uA 5V Ds 2R Output drive 1mA Cs Cfb 5uA 5V Vcc R
FAN7554 1 FB
Figure 13. Soft Start Circuit & Circuit Flow
Oscillator
As shown in figure14, the oscillator frequency is programmed by values selected for timing components Rt and Ct. Capacitor Ct is charged to almost 2.8V through resistor Rt from the 5V reference and discharged to 1.2V by an internal current source. The oscillator generates the clock signal while the timing capacitor Ct is discharged. The gate drive output becomes low during the clock time. Rt and Ct selection determine the oscillator frequency and maximum duty cycle. Charge and discharge times can be calculated through the equations below. Charging time : tc = 0.55xRtxCt Discharging time : td = RtxCtxln[(0.0063xRt - 2.8) / (0.0063xRt - 3.8)] where the oscillator frequency : fosc = (tc + td)-1 (10%) When Rt > 5k, fosc = 1 / (0.55xRtxCt) = 1.8 / (RtxCt)
Vhigh(2.8V)
Vref 8
Rt
Sawtooth waveform
+
Clock
Vlow(1.2V)
[ Rt > 5k]
tc td
CT Ct 4
Discharge
Discharge
Gate Drive
Ct
Internal clock Vhigh(2.8V)
2.8V /1.2V
Sawtooth waveform Vlow(1.2V)
tc td
[ Rt < 5k]
FAN7554
Internal clock
Figure 14. Oscillator Circuit
Figure 15. Sawtooth & Clock Waveform
9
FAN7554
Feedback
As shown in figure16, the internal oscillator clock turns on the MOSFET. The feedback comparator operates to turn it off again, when the MOSFET current reaches a set value proportional to Vfb. The feedback capacitor Cfb is charged by the internal current sources , 1mA and 5uA, and is discharged by the secondary side photo-coupler to control the output voltage.
DRIN OSC
Vfb 2R Vfb/3 S R 1mA Cfb 5uA 5V Vcc R Q
OUT 6
IS 3 FAN7554
Rs
Vsense
1 FB
Figure 16. Feedback & PWM Circuit
Delayed Shutdown
During the normal operation, the feedback voltage is between 0~3V. If the output terminal overloads or an error happens to the feedback loop, the delayed shutdown circuit operates. When the feedback voltage is less than 3V, the feedback capacitor is charged by current sources, 1mA and 5uA; when the feedback voltage becomes greater than 3V, the capacitor is charged by the 5uA current source because diode D1 turns off. When the feedback voltage is less than 3V, the charge slope becomes an exponential function and, when it is greater than 3V, the charge slope becomes linear. When the feedback voltage reaches almost 6V, the FAN7554 shuts down. The shut down circuit is configured for auto-restart, so it automatically restarts when Vcc reaches the under voltage 9V.
FB 1
5uA Vcc 2R D1 1mA Cfb 5V R S R Q
DRIN OSC OUT 6
IS 3
Rs Over Current Comparator S R Q
Shutdown
6V UVLO - out
FAN7554
Figure 17-A . Delayed Shutdown & Feedback Circuit
10
FAN7554
Vfb 6V
Slope (dv/dt) = 5uA / Cfb Shutdown start point 3V
t1
t2
Figure 17-B . Delayed Shutdown & Feedback Waveform
t
Gate Driver
The gate drive circuit has the totem-pole output configuration. The output has 1A peak current and 200mA average current drive ability.
7
Clock
DRAIN OUT 6
Q
Shutdown
FAN7554
Figure 18. Gate Drive Circuit
ON/OFF Control
The FAN7554 is able to use the feedback pin for ON/OFF control by placing NPN transistor between the cathode of the KA431 and ground as shown in figure 19. When the transistor turns on, the current flows through the photo diode and saturates the photo transistor. As a result, the feedback voltage is dropped to zero. When the feedback voltage is below 0.3V, the soft start voltage starts to discharge by connecting the internal resistor 1k in parallel with the external capacitor Cs. When the soft start voltage becomes less than 1.5V, all the blocks in the FAN7554 are turned off , with the exceptions of the UVLO block and ON/OFF control block. The operation current is about 200uA. So the stand-by power is reduced and SMPS efficiency is improved. When the feedback voltage exceeds 0.3V, the FAN7554 normally operates by turning on Vref block.
11
FAN7554
Vref 3.5V S 100uA Q OFF PWR / SAVE 5V Vref R
VCC 7 UVLO
S/S 2
1K 0.3V Vo Cs Cfb 1.5V
ON
15V/9V Good logic Internal bias
FB
1
5uA
Vcc Remote control
FAN7554
Figure 19. ON/OFF Control Circuit
Vref 5V
Icc 4.5mA
0.2mA t VS/S 5V Slope (dv/dt) = 100uA / Cs Slope (dv/dt) = 1k * Cs 3V Slope (dv/dt) = (1mA +100uA) / Cs 1.5V
t Vfb 0.3~3V Slope (dv/dt) = (1mA +5A) / Cfb OFF Signal Slope (dv/dt) = (5uA) / Cfb 0.3V Normal State ON Signal
OFF State
Figure 20. ON-OFF Control Circuit Waveforms
Normal State
t
12
FAN7554
Protection Circuits
The FAN7554 has many built-in protection circuits that do not need additional components, providing reliability without cost increase. These protection circuits have the auto-restart configuration. In this configuration, the protection circuits reset when Vcc is below UVLO stop threshold (9V) and restarts when Vcc is above UVLO start threshold voltage (15V)
Over Voltage Protection
Abnormalities may occur in the SMPS secondary side feedback circuit. First, when the feedback pin is short to the ground, the feedback voltage is zero and the FAN7554 is unable to start switching. Second, when the feedback circuit is open, the secondary voltage generally becomes much greater than the rated voltage as the primary side continues to switch at the maximum current level. This may cause the blowing off the fuse or, in serious cases, fires. It is possible that the devices directly connected to the secondary output without a regulator could be destroyed. Even in these cases, the over voltage protection circuit operates. Since Vcc is proportional to the output , in an over voltage situation, it also will increase. In the FAN7554, the protection circuit operates when Vcc exceeds 34V. Therefore ,in normal operation, Vcc must be set below 34V.
Over Load Protection
An overload is the state in which the load is operating normally but in excess of the preset load. The overload protection circuit can force the FAN7554 to stop its operation . The protection can also operate in transient states such as initial SMPS operation. Because the transient state returns to the normal state after a fixed time, the protection circuit need not to operate during this time. That is, the FAN7554 needs the time to detect and decide whether it is an overload condition or not. The protection circuit can be prevented from operating during transient states by ensuring that a certain amount of time passes before the protection circuit operates. The above operations are executed as follows: Since the FAN7554 adopts a current mode, it is impossible for current to flow above a maximum level. For a fixed input voltage, this limits power. Therefore, if the power at the output exceeds this maximum, Vo, shown in figure21, becomes less than the set voltage, and the KA431pulls in only the given minimum current. As a result, the photo-coupler's secondary side current becomes zero. The same goes for the photo-coupler's primary side current. Consequently, when the full current 1mA flows through the internal resistor (2R + R = 3R), Vfb becomes approximately 3V and from that time, the 5uA current source begins to charge Cfb, the photo-coupler's secondary current is almost zero. The FAN7554 shuts down when Vfb reaches 6V.
6V
S R
Q
Shutdown
Vo
Vfb
UVLO out
OSC
1mA Cfb 5uA 5V Vcc R 2R S R Q
FAN7554
KA431
1 FB
V 6V
Shutdown start point 3V
t1
Time Constant = 3R * Cfb t2 5uA = (Cfb *3V)/t2 t
Figure 21. Delayed Shutdown
13
FAN7554
FAN7554 Flyback Converter Demo Circuit (Fsw:100kHz)
BD
NTC R103
T101
D201
L201
12V/3.5A
R203
C102
C104
R104 C201 D101
R101 C103 C301 C302
R102
C202 R204
LF101 R201 C101 D102 R106 R105 TNR FUSE D103
8 7 6 5
R202
Q101
IC301
R205 C203
IC201 R108
Vref Vcc OUT GND R107
FAN7554
FB
1
IC101 C109 R109
Input:85 ~ 265VAC 50/60Hz
C105 IC301
S/S
2
IS Rt/Ct
3 4
R110 C108 C106 C107
R111
14
FAN7554
Part List For FAN7554 Flyback Converter Demo Board
Part FUSE NTC R101 R102 R103, R104 R105 R106 R107 R108 R109 R110 R201 R202 R203 R204 R205 Q101 IC101 IC201 IC301 Value FUSE 250 2A NTC 5D-11 RESISTOR 330k 100k 22 4.7k 12k 10 1k 0.5 1k 1k 4.7k 1.2k MOSFET FQP6N70 IC FAN7554 KA431 Opto-coupler Fairchild Fairchild Fairchild Fairchild D201 D101 D102 D103 BD 1W 1W 2W LF101 L201 INDUCTOR 30mH 6.4uH DIODE MBRF10100CT UF4007 1N4148 UF4004 G3SBA60 Fairchild Fairchild C101 C102 C103 C104 C105 C106 C107 C108 C109 C201 C202 C203 C301 C302 Note Part Value CAPACITOR 100nF/ 275V 100nF/ 275V 470nF/ 400WV 103/ 1kV 104 1uF/ 10V 101 122 22uF/ 50V 330uF 330uF 104 Box Capacitor Box Capacitor Electrolytic Film Capacitor Ceramic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Ceramic Note
15
FAN7554
Transformer Specification
Schematic Diagram (Top view)
3mm 1 12 10 3 9 8 11 4
6mm 2mm
NP
NB NP N12V N12V NP
bottom top
NB
5
7 6
Winding Specification
No. NP N12V NP NB Pin(S F) 13 7 11 13 54 Wire 0.35 x 1 0.35 x 4 0.35 x 1 0.35 x 1 Turns 44 12 44 13 Winding Method -
Electrical Characteristic
Closure Inductance Leakagel Pin 1-3 1-3 Spec. 400uH 10% 10uH MAX . Remarks 100kHz, 1V 2nd All short
16
FAN7554
FAN7554 forward converter demo circuit ( fsw:100kHz)
BD
D201 T101 C104 R105 C102 R103 R104
L201 +12V/2A
C201 D102
C202
C301 C302 D202 L101 R106 C101 R101 IC2 FUSE R102 R113 D101 RT101 C106
F/B S/S 1 2 IS Rt/Ct 3 4
+5V/3A L202 R201 C203 C204 R202
C103
R107 D103 D104
C105
R108 Q101 R110 R109 R203
5 8 7 6 Vref Vcc OUT GND
FAN7554
Input: 85 ~ 265VAC 50/60Hz
IC301
C110 C111
C107 C108
R112 C109 R111 IC301 R204
C205
IC201
17
FAN7554
Part List For FAN7554 Forward Converter Demo Board
Part FUSE RT101 R101 R102 R103, R104 R105, R106 R107 R108 R109 R110 R111 R112 R113 R201, R202 R203 R204 Q101 IC101 IC201 IC301 Value FUSE 250 2A NTC DSC 10D-11 RESISTOR 330k 56k 220k 10 20 4.7k 1.2k 0.5//0.5//0.5 1k 12k 10k 1k 330 MOSFET SSH8N80 IC FAN7554 KA431 Opto-Coupler Fairchild Fairchild Fairchild Fairchild D101 D102 D103 D201 D202 BD 1W 1W 1W 2W LF101 L201 C101 C102, C103 C104 C105 C106 C107 C108 C109 C110 C111 C201, C202 C203 C204 C205 C301, C302 Note Part Value CAPACITOR 470nF/ 275V 470nF/ 400WV 223/ 630V 33uF/ 35V 104 1uF/ 35V 101 122 272 333 1000uF/ 35V 330uF/ 16V 2200uF/ 16V 104 332/ 1kV INDUCTOR 30mH DIODE 1N4004 FR157 UF4007 MBRF10100CT MBR3045PT PBS406GU Box Capacitor Electrolytic Film Film Capacitor Ceramic Electrolytic Ceramic Ceramic Film Film Electrolytic Electrolytic Electrolytic Ceramic Ceramic Note
18
FAN7554
Transformer specification
Schematic Diagram (Top view)
1 13, 14
Np ; 32turn
3
Ns,12 ; 5turn Nvcc ; 6turn
8, 9
Np ; 32turn Ns,12 ; 5turn
6
Nvcc ; 5turn
7
Ns,5 ; 4turn
10,11,12
Ns,5 ; 4turn Np ; 32turn
Winding Specification
No. NP NS , 5 NS, 12 NP NVCC
Core : Powder 27 pi 16grade 5V : 12T ( 1 x 2 ) 12V : 27T ( 1.2 x 1 )
Pin(S F) 13 8 11 49 13 76
Wire 0.65 x 1 0.65 x 4 0.65 x 4 0.65 x 1 0.65 x 1
Turns 32 4 5 32 5
19
FAN7554
Mechanical Dimensions
Package Dimensions in millimeters
8-SOP
Symbol A A1 A2 B C D E e H h L GP q aaa bbb
Min 0.10 1.25 0.35 0.19 4.80 3.80 5.79 0.25 0.50 0 -
Nom 0.15 1.45 0.37 0.20 4.90 3.90 1.27BSC 5.99 0.70 0.36 BSC -
Max 1.75 0.25 1.50 0.51 0.25 5.00 4.00 6.20 0.50 0.90 8 0.25 0.10
20
FAN7554
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
8-DIP
21
FAN7554
Ordering Information
Product Number FAN7554 FAN7554D Package 8-DIP 8-SOP Operating Temperature -25C ~ 85C
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.
www.fairchildsemi.com 10/2/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation
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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