www.fairchildsemi.com KA7525B Power Factor Correction Controller Features Description • Internal Start-up Timer • Internal Current Sense Blanking Which Eliminates the Need for an External R/C filter • Overvoltage Comparator Eliminates Runaway Output Voltage • Zero Current Detector • One Quadrant Multiplier • Trimmed 1.5% Internal Bandgap Reference • Under Voltage Lock Out with 2.1V of Hysteresis • Totem Pole Output with High State Clamp • Low Start-up and Operating Current • 8-Pin DIP or 8-Pin SOP. The KA7525B provides simple and high performance active power factor correction. KA7525B is optimized for electronic ballast and low power, high density power supplies requiring a minimum board area, reduced component count and low power dissipation. Addition of internal current sense blanking (Internal R,C) eliminates the need for an external R/C filter. Internal clamping of the error amplifier and multiplier outputs improves turn on overshoot characteristics and current limiting. Special circuitry has also been added to prevent no load runaway conditions. Output drive clamps limiting power MOSFET gate drive independent of supply voltage greatly enhance the products practical application. Applications • Electronic Ballast • SMPS 8-DIP 1 8-SOP 1 Rev.1.0.1 ©2002 Fairchild Semiconductor Corporation KA7525B Pin Assignments INV 1 8 Vcc EA OUT 2 7 OUT MULT 3 6 GND CS 4 5 Idet (Top View) Pin Definitions Pin Number 2 Pin Name Pin Function Description 1 INV Inverting input of the error amplifier. The output of the Boost converter should be resistively divided to 2.5V and connected to this pin. 2 EA_OUT The output of the error amplifier. A feedback compensation network is placed between this pin and the INV pin. 3 MULT Input of the multiplier stage. The full-wave rectified AC is divided to less than 2V and is connected to this pin. 4 CS Input of the PWM comparator. Current is sensed in the Boost stage MOSFET by a resistor in the source lead. An internal leading edge blanking circuitry has been included to reject any high frequency noise present on the current waveform. 5 Idet The zero current detector senses the inductor current by monitoring when the Boost inductor auxiliary winding voltage falls below 1.8V. 6 GND The ground potential of all the pins. 7 OUT The output of a high current power driver capable of driving the gate of a power MOSFET. 8 Vcc The logic and control power supply connection. KA7525B Internal Block Diagram Vcc 8 2.5V Ref + _ 2.1V 36V Internal Bias UVLO Vcc 10V 7 OUT Drive Output Timer R Q + Idet 5 S 240mV _ 7.5V Over Voltage Protection Zero Current Detector 1.8V + _ - CS 4 + R,C Filter R 1.8V Current Sense Comparator Vref 1.24V Vmo Vm1 MULT 3 0 ~2V K= Multiplier - + Vref + _ Vref ~ Vref+1V Vea(-) Vm2 1 INV Error Amp Pin4 Threshold(Vmo) Vm1× (Vm2-Vref) 6 GND 2 EA OUT Absolute Maximum Ratings Parameter Symbol Value Unit VCC 30 V Peak Drive Output Current Ioh, IoI ±500 mA Driver Output Clamping Diodes VO > VCC or VO < -0.3V Iclamp ±10 mA Detector Clamping Diodes Idet ±10 mA Error Amp, Multiplier and Comparator Input Voltage Vin -0.3 to 6 V Operating Temperature Range Topr 0 to 125 °C Storage Temperature Range Tstg -65 to 150 °C Supply Voltage Power Dissipation Thermal Resistance (Junction-to-Air) Pd 0.8 W Rθja 100 °C/W Temperature Characteristics (0°°C ≤ Ta ≤ 125°°C ) Characteristics Symbol Value Unit Temperature Stability for Reference Voltage(Vref) ∆Vref (Typ) 20 mV Temperature Stability for Multiplier Gain(K) ∆K/∆T (Typ) -0.2 %/°C 3 KA7525B Electrical Characteristics Unless otherwise specified, these specifications apply over the operating ambient temperatures for the KA7525B with 0°C ≤ Ta ≤ 125°C and Vcc=12V. Parameter Symbol Conditions Min. Typ. Max. Unit UNDER VOLTAGE LOCK OUT SECTION Start Threshold Voltage Vth (st) UVLO Hysteresis HY(st) Supply Zener Voltage Vcc Increasing - 9 10 11 V 1.7 2.1 2.5 V 30 36 - V 0.3 mA Vz Icc=10mA Ist Vcc < Vth(st) - 0.2 SUPPLY CURRENT SECTION Start-Up Supply Current Operating Supply Current Icc No Output Switching - 4 8 mA Dynamic Operating Supply Current Idcc 50kHz, CI =1nF - 5 10 mA Iref=0mA 2.465 2.5 2.535 V 0°C ≤ Ta ≤ 125°C 2.44 - 2.56 V ERROR AMPLIFIER SECTION Voltage Feedback Input Threshold Vref Line Regulation ∆Vref1 12V ≤ Vcc ≤ 25V - 0.1 10 mV Load Regulation (Note1) ∆Vref2 0mA ≤ Iref ≤ 2mA - 0.1 10 mV Temperature Stability of Vref (Note2) ∆Vref3 0°C ≤ Ta ≤ 125°C - 20 - mV Input Bias Current Ib(ea) -0.5 - 0.5 µA -2 -4.5 - mA Output Source Current Output Sink Current Output Voltage Range (Note2) Slew Rate (Note2) - Isource Vm2=3V Isink Vm2=2V ∆Veao No Load on EA Out 3 4.5 - mA 1.2 - 3.6 V SR - - 0.6 - V/µs Input Bias Current(Pin3) Ib(m) - -0.5 - 0.5 µA M1 Input Voltage Range (Pin3) ∆Vm1 - 0 - 2 V M2 Input Voltage Range (Pin2) ∆Vm2 - Vref - Vref+1 V Vm1=1V, ∆Vm2= 2.7 to 3.3V 0.55 0.68 0.8 1/V Vea(-) = 0V, Vm1=2V 1.1 1.24 1.45 V - -0.2 - %/°C MULTIPLIER SECTION Multiplier Gain(Note3) 4 K Maximum Multiplier Output Voltage Vomax(m) Temperature Stability of K (Note2) ∆K/∆T 0°C ≤ Ta ≤ 125°C KA7525B Electrical Characteristics (Continued) Parameter Symbol Conditions Min. Typ. Max. Unit CURRENT SENSE SECTION Input Offset Voltage (Note2) Vio(cs) Vm1 = 0V, Vm2 = 2.2V -10 3 10 mV Input Bias Current Ib(cs) 0V ≤ Vcs ≤ 1.7V -1 -0.3 1 µA Current Sense Delay to Output (Note2) td(cs) - - 200 500 ns ZERO CURRENT DETECT SECTION Detect Input Threshold Vth(det) Vdet Increasing 1.65 1.8 1.95 V Detect Hysteresis HY(det) - 180 240 300 mV 1 V Input Low Clamp Voltage Vclamp(I) Idet = -100uA 0.45 0.75 Input High Clamp Voltage Vclamp(h) Idet = 3mA 6.7 7.5 8.3 V 1V ≤ Vdet ≤ 6V -1 -0.2 1 µA - - ±3 mA Input Bias Current Ib(det) Input High/Low Clamp Diode Current(Note2) Iclamp(d) - OUTPUT DRIVER SECTION Output Voltage High Voh IO = -10mA, VCC = 12V 8.5 9 - V Output Voltage Low Vol IO = 10mA, VCC = 12V - 0.8 1 V Rising Time(Note2) tr CI = 1nF - 130 200 ns tf CI = 1nF Falling Time(Note2) - 50 120 ns 12 13 15 V VCC = 5V, IO = 100µA - - 1 V Vm1 = 1V, Vm2 = 3.5V - 300 - µs 1.7 1.8 1.9 V Maximum Output Voltage Vomax(o) VCC = 20V Output Voltage With UVLO Activated Vomin(o) RESTART TIMER SECTION Restart Time Delay td(rst) OVER VOLTAGE PROTECTION SECTION Voltage Feedback Input Threshold Vth(ovp) Vcs= -0.5V, Vm1=1V , Vdet=0V Notes : 1. Because the reference is not brought out externally, this specification cannot be tested on the package part. It is guaranteed by design. 2. These parameters, although guaranteed, are not 100% tested in production. 3. K = Pin4 Threshold Vm1×(Vm2-Vref) (Vm1=Vpin3, Vm2=Vpin2) 5 KA7525B Typical Performance Characteristics 1.4 1.6 Vm1=2.0V Veao=4.0V Veao=3.75V 1.4 1.2 1.2 1.0 Veao=3.25V Veao=3.5V Vm1=1.0V C.S. Threshold Voltage[V] C.S. Threshold Voltage[V] Vm1=2.5V Vm1=3.0V 1.0 Vm1=1.5V 0.8 0.6 Vm1=0.5V 0.4 Veao=3.0V 0.8 0.6 Veao=2.75V 0.4 0.2 Veao=2.5V 0.2 0.0 Vm1=0V 0.0 2.5 3.0 3.5 4.0 -0.2 4.5 0.0 0.5 1.0 E.A. Output Voltage[V] Figure 1. E.A. Output Voltage vs C.S. Threshold 2.52 17.50m 2.51 12.50m 10.00m 7.50m 5.00m 2.49 2.48 2.47 0 5 10 15 20 25 30 35 40 2.45 45 -20 0 20 40 60 80 100 120 140 Temperature['C] Supply Voltage[V] Figure 4. Reference Voltage vs Temperature Figure 3. Supply Current vs Supply Voltage 10.2 2.5 10.1 2.4 10.0 2.3 VU Lockout Hysteresis[V] Start-up Threshold[V] 3.0 2.46 2.50m 9.9 9.8 9.7 9.6 9.5 2.2 2.1 2.0 1.9 1.8 -20 0 20 40 60 80 100 120 140 Ambient Temperature['C] Figure 5. Start-up Threshold vs Temperature 6 2.5 2.50 Reference Voltage[V] Supply Current[A] 15.00m 9.4 2.0 Figure 2. Multiplier Input Voltage vs C.S. Threshold 20.00m 0.00 1.5 Multiplier Input Voltage[V] 1.7 -20 0 20 40 60 80 100 120 140 Ambient Temperature['C] Figure 6. UV Lockout Hysteresis vs Temperature KA7525B Typical Performance Characteristics (Continued) 300 -2 -3 250 E.A. Source Current[mA] Start-up Supply Current[uA] -4 200 150 100 -5 -6 -7 -8 50 -9 0 -20 0 20 40 60 80 100 120 -10 140 -20 0 20 Figure 7. Start-up Supply Current vs Temperature 8 0.3 7 0.2 E.A. Input Bias Current[mA] 0.4 E.A. Sink Current[mA] 0.5 9 6 5 4 3 60 80 100 120 -0.5 140 -20 0 20 Temperature['C] 60 80 100 120 140 Figure 10. E.A. Input Bias Current vs Temperature 0.80 1.95 0.75 1.90 0.70 1.85 Idet Threshold High[V] Multiplier Gain[1/V] 40 Temperature['C] Figure 9. E.A. Sink Current vs Temperature 0.65 0.60 0.55 0.50 140 -0.2 -0.4 40 120 0.0 -0.3 20 100 -0.1 1 0 80 0.1 2 -20 60 Figure 8. E.A. Source Current vs Temperature 10 0 40 Temperature['C] Temperature['C] 1.80 1.75 1.70 -20 0 20 40 60 80 100 Temperature['C] Figure 11. Multiplier Gain vs Temperature 120 140 1.65 -20 0 20 40 60 80 100 120 140 Temperature['C] Figure 12. Idet Threshold High vs Temperature 7 KA7525B 300 600 250 500 200 400 Restart Time[uS] Idet Input Hysteresis[mV] Typical Performance Characteristics (Continued) 150 100 50 0 300 200 100 -20 0 20 40 60 80 100 120 0 140 -20 0 20 Temperature['C] 40 60 80 100 120 140 120 140 120 140 Temperature['C] Figure 13. Idet Input Hysteresis vs Temperature Figure 14. Restart Time vs Temperature 200 1.45 180 1.40 140 Rise Time[nS] Maximum Mult. Output Voltage[V] 160 1.35 1.30 1.25 120 100 80 60 1.20 40 1.15 20 1.10 0 -20 0 20 40 60 80 100 120 140 -20 0 20 40 60 80 100 Temperature['C] Temperature Figure 15. Max. Mult. Output Voltage vs Temperature Figure 16. Rise Time vs Temperature 120 8 110 7 100 90 6 Supply Current[mA] Fall Time[nS] 80 70 60 50 40 30 5 4 3 2 20 1 10 0 -20 0 20 40 60 80 100 Temperature['C] Figure 17. Fall Time vs Temperature 8 120 140 0 -20 0 20 40 60 80 100 Temperature['C] Figure 18. Supply Current vs Temperature KA7525B Operating Description KA7525B is high performance, critical conduction, current-mode power factor controller specifically designed for use in off line active preconverters with minimal external components. This device provides the necessary features required to significantly enhance poor power factor loads by keeping the ac line current sinuosity and in phase with the line voltage. KA7525B contains many of the building blocks and protection features that are employed in modern high performance current mode power supply controllers. A description of each of the function blocks is given below. START-UP An Under Voltage Lockout comparator has been incorporated to guarantee that IC is fully functional before enable the output stage. The positive power supply terminal (Vcc) is monitored by the UVLO comparator with the upper threshold set at 10V and the lower threshold at 7.9V. In the stand-by mode, with Vcc at 9.5V, the required supply current is less than 0.2mA. This large hysteresis and low start-up current allow the implementation of efficient bootstrap start-up techniques, making this device ideally suited for wide range off-line preconverter applications. Fig.1.1 shows the start-up circuit. Circuit operation is as follows: The start-up capacitor (Cst) is charged by current through start-up resistor (Rst) minus the start-up current drawn by the IC. Once the capacitor voltage reaches the start-up threshold, the IC turns on, starting the switching of the MOSFET. The operation of the IC demands an increase in operating current which results in discharging the capacitor. Before the start-up capacitor voltage is discharged below hysteresis voltage, the auxiliary winding voltage takes over as the supply voltage as shown in Fig. 1.2. Rst DVcc AC input Vcc + Out KA7525/B B Cst Figure 1.1 Start-up Circuit Vcc Cst discharges Vstart Hysteresis Cst charges from Rst t Figure 1.2 Start-up Capacitor Voltage 9 KA7525B Error Amplifier An Error Amplifier with access to the inverting input and output is provided. The noninverting input is internally biased at 2.5V and is not pinned out. The output voltage of the power factor converter is typically divided down and monitored by the inverting input. The error amp output is internally connected to the multiplier and is pinned out for external loop compensation. Typically, the bandwidth is set below 20Hz, so that the amplifer’s output voltage is relatively constant over a given ac line cycle. In effect, the error amp monitors the average output voltage of the converter over several line cycles. Input bias current(0.5uA, max) can cause an output voltage error that is equal to the product of the input bias current and the value of the upper divider resistor, R1 in Fig. 2.1. 1.8V Over Voltage To Drive Comparator Output Shutdown + R1 - R2 Vref Vref + D1 D2 _ + R3 1 INV - + + To Multiplier 2 Ccomp EA OUT Band width= 1/(2π×R1×Ccomp) Figure 2.1 Error Amp and Over Voltage Comparator Over Voltage Protection The low bandwidth (typically below 20Hz) characteristic of Error Amplifier control loop results in output voltage runaway condition. This condition can occur during initial start-up, sudden load removal, or during output arcing. The over voltage comparator monitors the output voltage of the error amplifier. When load is removed, error amp output swings lower than 1.8V, comparator is triggered high and output driver is turned off till the error amp inverting input voltage drops below 2.5V. At this point, the error amp output swings positive, turns the output driver back on. The diode, D1,D2 clamp the error amp output voltage to two diode drops above reference voltage. This prohibits the error amplifier from being saturated, allowing it to recover faster thus minimizing the boost voltage overshoot. Multiplier A single quadrant, two input multiplier is the critical element that enables this device to get power factor correction. One input of multiplier(Pin 3) is connected to an external resistor divider monitoring the rectified ac line. The other input is internally driven by a DC voltage which is the difference of error amplifier output (Pin 2) and reference voltage, Vref. The multiplier is designed to have an extremely linear transfer curve over a wide dynamic range, 0V to 2V for Pin 3, and 2.5V to 3.5V for the error amplifier output under all line and load conditions. The multiplier output controls the current sense comparator threshold as the ac voltage traverses sinusoidally from zero to peak line. This allows the inductor peak current to follow the ac line thus forcing the average input current to be sinusoidal. In other words, this has the effect of forcing the MOSFET on-time to track the input line voltage, resulting in a fixed drive output on-time, thus making the preconverter load appear to be resistive to the ac line. 10 KA7525B The equation below describes the relationship between multiplier output and inputs. Vmo = K × Vm1 × (Vm2-Vref) K : Multiplier gain Vm1: Voltage at Pin 3 Vm2: Error amp output voltage Vmo: Multiplier output voltage Current Sense Comparator - + CS 4 + 1.24V Vref Vmo Vm1 3 MULT Error Amp. Vm2 + + + - 1 INV 2 EA OUT Figure 3.1 Multiplier Block Current Sense Comparator The current sense comparator RS latch configuration used ensures that only a single pulse appears at the drive output during a given cycle. MOSFET drain current is converted to voltage using an external sense resistor in series with the external power MOSFET. When sense voltage exceeds the threshold set by the multiplier output, the current sense comparator terminates the gate drive to the MOSFET and resets the PWM latch. The latch insures that the output remains in a low state after the MOSFET drain current falls back to zero. The peak inductor current under normal operating conditions is controlled by the multiplier output, Vmo. Abnormal operating conditions occur during preconverter start-up at extremely high line or if output voltage sensing is lost. Under these conditions, the multiplier output and current sense threshold will be internally clamped to 1.24V. Therefore, the maximum peak switch current is limited to: Ipk(max) = 1.24V / Rsense Internal R,C filter has been included to attenuate any high frequency noise that may be present on the current waveform. These circuit block eliminate the need for an external RC filter otherwise required for proper operation of the circuit. LEB Delay(KA7525) RC filter cs + - 4 Rsense Low Pass Filter can be eliminated 1.24V Multiplier Output Figure 4.1 Current Sense Circuit 11 KA7525B Zero Current Detector KA7525B operates as a critical conduction current mode controller. The power MOSFET is turned on by the zero current detector and turned off when the peak inductor current reaches the threshold level established by the multiplier output. The slope of the inductor current is indirectly detected by monitoring the voltage across a separate winding and connecting it to the zero current detector Pin 5. Once the inductor current reaches ground level, the voltage across the winding reverses polarity. When the Idet input falls below 1.8V, the comparator output is triggered to the low state. To prevent false tripping, 240mV of hysteresis is provided. The zero current detector input is internally protected by two clamps. The upper 7.5V clamp prevents input over voltage breakdown while the lower 0.75V clamp prevents substrate injection. An internal current limit resistor protects the lower clamp transistor in case the Idet pin is accidently shorted to ground. A watchdog timer function was added to the IC to eliminate the need for an external oscillator when used in stand-alone applications. The timer provides a means to automatically start or restart the preconverter if the drive output has been off for more than 300us after the inductor current reaches zero. Drive Output The KA7525B contains a single totem-pole output stage specifically designed for direct drive of power MOSFET. The drive output is capable of up to 500mA peak current with a typical rise and fall time of 130ns, 50ns each with a 1.0nF load. Additional internal circuitry has been added to keep the drive output in a sinking mode whenever the UVLO is active. This characteristic eliminates the need for an external gate pull-down resistor. Internal voltage clamping ensures that output driver is always lower than 13V when supply voltage variation exceeds more than rated Vgs threshold (typ 20V) of the external MOSFET. This eliminates an external zener diode and extra power dissipation associated with it that otherwise is required for reliable circuit operation. 12 KA7525B Application Circuit(#1) IN4937 L 0.1uF 1M IN4004 IRF830 PBP204 Input AC input filter 390K + Idet 3.3Ω LOAD 5.1K 47uF/450V 0.5Ω/1W + 68uF 5K 22K 33Ω Vcc 8 IN4148 10Ω 2.5V Ref + Internal Bias 2.1V - 36V Vcc UVLO 7 Drive Output 10V Timer R Idet + 5 7.5V CS OUT Q S Zeror Current 1.8V Detector Over Voltage Protection Only KA7525B - 4 + R + 1.8V Current Sense Comparator Delay (KA7525) - Vref 1.24V 1.8M Vmo MULT 3 Multiplier K= Vref INV Vm2 0 ~ 2V 10K 0.01uF + + Vm1 Vref ~ Vref + 1V Vmo Vm1× (Vm2 - Vref) Error Amp Vea(-) 1 0.1uF GND 6 2 EA OUT 13 KA7525B Application Circuit(#2) < 32W×2 Lamps Self-oscillating Ballast> L2 D5 L6 Q1 R12 R9 R1 C9 D3 D4 R4 L5 R6 D6 R18 C11 L3 L4 L5 R10 R5 R7 D2 D7 5 7 8 C2 Q2 R13 R2 D1 R14 R17 C4 2 C14 Lamp 1 C15 Lamp 2 + C3 KA7525/B 1 C1 C6 C8 D8 C10 3 6 L1 4 L7 R16 C13 C7 V1 R11 + R3 Fuse C5 Q3 R8 C16 L5 R15 C12 AC Input GND Component Listing (For Application #2) 14 Reference Value Part Number Manufacturer R1, 2 1.1MΩ-F, 1/4W 26mm Type - R3 11kΩ-F, 1/4W 26mm Type - R4 130kΩ , 1/2W 26mm Type - R5 22kΩ-J, 1/4W 26mm Type - R6, 13, 15 47kΩ-J, 1/4W 26mm Type - R7 3.3Ω, 1/4W 26mm Type - R8 1Ω-J, 1W 26mm Type - R9 180kΩ-F, 1/4W 26mm Type - R10 820kΩ-F, 1/4W 26mm Type - R11 6.8kΩ-F, 1/4W 26mm Type - KA7525B Component Listing (Continued) Reference Value Part Number Manufacturer R12, 17, 18 390kΩ-J, 1/4W 26mm Type - R14, 16 8.2Ω-J, 1/4W 26mm Type - C1 0.15uF, 630V MEP-CAP - C2, 3 2200pF, 3000V Y-CAP - C4 0.22uF, 630V MPE-CAP - C5 22uF, 35V Electrolytic - C6 0.22uF, 25V PPF-CAP - C7 1000pF, 50V PPF-CAP - C8 47uF, 450V Electrolytic - C9 4700pF, 630V PPF-CAP - C10 2200pF, 630V PPF-CAP - C11, 12 0.15uF, 630V MPF-CAP - C13 0.1uF, 50V PPF-CAP - C14, 15 8200pF, 1000V PP-CAP - C16 0.15uF, 630V MEP-CAP - D1, 2, 3, 4, 7 1000V, 1A IN4007GP - D5 1000V, 1.5A BYV26C - D6 75V, 150mA IN4148 - D8 - N413N (DIAC) - L1 DR 10×12 DIT-010 - L2 EI 2519 DBT-002 - L3, 4 EI 2820 DPT-086 - L5 SB5S 8×3×4 DDT-005 - L6, 7 10uH BS24-100K - Fuse - 52NM250V, 3A - V1 430V INR140, 431 - KA7525B - KA7525B FairChild Q1 500V, 4.5A FQPF6N50 FairChild Q2, 3 400V, 5A KSC5305D FairChild 15 KA7525B Mechanical Dimensions Package Dimensions in millimeters 1.524 ±0.10 #5 2.54 0.100 5.08 MAX 0.200 7.62 0.300 3.40 ±0.20 0.134 ±0.008 +0.10 0.25 –0.05 +0.004 0~15° 16 0.010 –0.002 3.30 ±0.30 0.130 ±0.012 0.33 MIN 0.013 0.060 ±0.004 #4 0.018 ±0.004 #8 9.60 MAX 0.378 #1 9.20 ±0.20 0.362 ±0.008 ( 6.40 ±0.20 0.252 ±0.008 0.46 ±0.10 0.79 ) 0.031 8-DIP KA7525B Mechanical Dimensions (Continued) Package Dimensions in millimeters 8-SOP MIN #5 6.00 ±0.30 0.236 ±0.012 8° 0~ +0.10 0.15 -0.05 +0.004 0.006 -0.002 MAX0.10 MAX0.004 1.80 MAX 0.071 3.95 ±0.20 0.156 ±0.008 5.72 0.225 0.41 ±0.10 0.016 ±0.004 #4 1.27 0.050 #8 5.13 MAX 0.202 #1 4.92 ±0.20 0.194 ±0.008 ( 0.56 ) 0.022 1.55 ±0.20 0.061 ±0.008 0.1~0.25 0.004~0.001 0.50 ±0.20 0.020 ±0.008 17 KA7525B Ordering Information Product Number Package KA7525B 8-DIP KA7525BD 8-SOP Operating Temperature 0 ~ +125°C 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. www.fairchildsemi.com 11/19/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation