PD - 94549A ATR28XXS SERIES HYBRID-HIGH RELIABILITY DC/DC CONVERTERS 28V Input, Single Output Description The ATR28XXS Series of DC/DC converters feature high power density and an extended temperature range for use in military and industrial applications. Designed to MIL-STD-704D input requirements, these devices have nominal 28VDC inputs with 3.3V, 5V, 12V and 15V single outputs to satisfy a wide range of requirements. The circuit design incorporates a pulse width modulated single forward topology operating in the feed-forward mode at a nominal switching frequency of 550KHz. Input to output isolation is achieved through the use of transformers in the forward and feedback circuits. The advanced feedback design provides fast loop response for superior line and load transient characteristics and offers greater reliability and radiation tolerance than devices incorporating optical feedback circuits. Three standard temperature grades are offered with screening options. Refer to Part Number section. These devices can be provided in a standard plug-in package for PC mounting or in a flanged package for more severe environments. These converters are manufactured in a facility certified to MIL-PRF-38534. All processes used to manufacture these converters have been qualified to enable Advanced Analog to deliver compliant devices. Four screening grades are available to satisfy a wide range of requirements. The CH grade converters are fully compliant to MIL-PRF-38534 for class H. The HB grade converters are processed to full class H screening but do not have class H element evaluation as required by MIL-PRF-38534. Both grades are fully tested to confirm operation over the full military temperature range without derating of output power. The ES version is a full temperature device without the full class H or element evaluation. The non-suffix device is a low cost limited temperature range option. Variations in electrical, mechanical and screening can be accommodated. www.irf.com ATR Features n 16 to 40 VDC Input Range (28 VDC Nominal) n 3.3V, 5V, 12V and 15V Outputs Available n Indefinite Short Circuit and Overload Protection 3 n Up to 35 W/in Power Density n 30 Watt Output Power Models n Fast Loop Response for Superior Transient Characteristics n Operating Temperature Range from -55°C to +125°C n Popular Industry Standard Pin-Out n Resistance Seam Welded Case for Superior Long Term Hermeticity n Ceramic Feed-thru Pins n External Synchronization n Efficiencies up to 84% n Shutdown from External Signal n Military Screening Extensive computer simulation using complex modeling enables rapid design modification to be provided. Contact IR Santa Clara with specific requirements. 1 04/01/04 ATR28XXS Series Specifications ATR2803R3S ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50V Soldering Temperature 300°C for 10 seconds Case Temperature Operating -55°C to +125°C Storage -65°C to +135°C Table I. Electrical performance Characteristics Test Symbol Output voltage VOUT 1 Output current Output ripple voltage Line regulation 2 3 Load regulation IOUT VRIP VRLINE 3 VRLOAD Input current IIN Input ripple current 2 IRIP Efficiency EFF Isolation ISO Capacitive load 4, 5 Power dissipation load fault CL PD Switching frequency Sync frequency range Output response to step 7 transient load changes Recovery time step 7, 8 transient load changes FS FSYNC VOTLOAD Output response to transient 5, 9 step line changes VOTLINE TTLOAD Conditions -55°C ≤ TC ≤ +125°C VIN = 28VDC ±5%, CL = 0 Unless otherwise specified IOUT = 0 VIN = 16, 28, and 40 VDC VIN = 16, 28, and 40 VDC B.W. = 20Hz to 2 MHz VIN = 16, 28, and 40 VDC IOUT = 0, 3000, and 6000mA VIN = 16,28, and 40 VDC IOUT = 0, 3000, and 6000mA IOUT = 0, inhibit (pin 2) Tied to input return (pin 10) IOUT = 0, inhibit (pin 2) = open IOUT =6000mA B.W. = 20Hz to 2 MHz IOUT =6000mA Input to output or any pin to case (except pin 8) at 500 VDC, TC =+25°C No effect on dc performance TC =+25°C 6 Overload, TC = +25°C Short Circuit IOUT = 7500mA IOUT = 7500mA Load step 50% to/from 100% Load step 50% to/from 100% Load step 50% to/from 100% Load step 50% to/from 100% Input step 16V to/from 40VDC, IOUT = 7500mA Group A Subgroups Device Types 1 2,3 1,2,3 1,2,3 01 01 01 1 Limits Units Min Max 3.25 3.20 3.35 3.40 7500 60 mA mV p-p 01 ±20 mV 2,3 1,2,3 01 ±30 ±50 mV 1,2,3 01 18 mA 1,2,3 01 50 50 mA p-p 1 2,3 1 01 4 01 1 1,2,3 4,5,6 4,5,6 4,5,6 4,5,6 4 5,6 4 5,6 4,5,6 01 74 70 100 01 01 01 01 01 % MΩ 500 12 01 500 500 -500 -500 V 9 600 700 +500 +500 100 200 100 200 ±500 µF W KHz KHz mV pk µs mV pk For Notes to Specifications, refer to page 3 2 www.irf.com ATR28XXS Series ATR2803R3S Table I. Electrical performance Characteristics - continued Symbol Recovery time transient step 5, 8, 9 line changes Turn on overshoot 10 Turn on delay 5, 10 Load fault recovery TTLINE VTonOS TonD TrLF Conditions -55°C ≤ TC ≤ +125°C VIN = 28VDC ±5%, CL = 0 Unless otherwise specified Input step 16V to/from 40VDC, IOUT = 7500mA IOUT = 10% to 100% of Load IOUT =0 and 7500mA Group A Subgroups Device Types Limits Min Units Max 4,5,6 01 10 ms 4,5,6 4,5,6 4,5,6 01 01 01 350 25 25 mV pk ms ms Notes to Specifications 1 2 3 4 Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. Output voltage measured at load with remote sense leads connected across load. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on. 5 Parameter shall be tested as part of design characterization and after design or process changes. Thereafter parameters shall be guaranteed to the limits specified in table I. 6 An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 7 Load step transition time between 2 and 10 microseconds. 8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent load. 9 Input step transition time between 2 and 10 microseconds. 10 Turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input. www.irf.com 3 ATR28XXS Series Specifications ATR2805S ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50V Soldering Temperature 300°C for 10 seconds Case Temperature Operating -55°C to +125°C Storage -65°C to +135°C Table II. Electrical performance Characteristics Test Symbol Output voltage VOUT 1 IOUT VRIP 3 VRLINE Output current 2 Output ripple voltage Line regulation Load regulation 3 VRLOAD Input current IIN Input ripple current 2 IRIP Efficiency EFF Isolation ISO Capacitive load 4, 5 Power dissipation load fault Switching frequency Sync frequency range Output response to step 7 transient load changes Recovery time step 7, 8 transient load changes CL PD Conditions -55°C ≤ TC ≤ +125°C VIN = 28VDC ±5%, CL = 0 Unless otherwise specified IOUT = 0 VIN = 16, 28, and 40 VDC VIN = 16, 28, and 40 VDC B.W. = 20Hz to 2 MHz VIN = 16, 28, and 40 VDC IOUT = 0, 3000, and 6000mA VIN = 16,28, and 40 VDC IOUT = 0, 3000, and 6000mA IOUT = 0, inhibit (pin 2) Tied to input return (pin 10) IOUT = 0, inhibit (pin 2) = open IOUT =6000mA B.W. = 20Hz to 2 MHz IOUT =6000mA Input to output or any pin to case (except pin 8) at 500 VDC, TC =+25°C No effect on dc performance TC =+25°C 6 Overload, TC = +25°C Device Types 01 Limits Units Min Max 4.95 4.90 mA mV p-p 1 2,3 1,2,3 1,2,3 01 01 5.05 5.10 6000 60 1 01 ±20 mV 2,3 1,2,3 01 ±30 ±50 mV 1,2,3 01 18 mA 1,2,3 01 50 50 mA p-p 1 2,3 1 01 01 4 01 76 72 100 MΩ 500 1 FS FSYNC VOTLOAD TTLOAD Short Circuit IOUT = 6000mA IOUT = 6000mA 3000mA to/from 6000mA 500mA to/from 3000mA 3000mA to/from 6000mA VOTLINE Input step 16V to/from 40VDC, IOUT = 6000mA 1,2,3 4,5,6 4,5,6 4,5,6 4,5,6 4 5,6 4 5,6 4,5,6 V % µF 12 01 500mA to/from 3000mA Output response to transient 5, 9 step line changes Group A Subgroups 01 01 01 01 01 W 500 500 -500 -500 9 600 700 +500 +500 100 200 100 200 ±500 KHz KHz mV pk µs mV pk For Notes to Specifications, refer to page 5 4 www.irf.com ATR28XXS Series ATR2805S Table II. Electrical performance Characteristics - continued Test Recovery time transient step 5, 8, 9 line changes Turn on overshoot 10 Turn on delay 5, 10 Load fault recovery Symbol TTLINE VTonOS TonD TrLF Conditions -55°C ≤ TC ≤ +125°C VIN = 28VDC ±5%, CL = 0 Unless otherwise specified Input step 16V to/from 40VDC, IOUT = 6000mA IOUT =0 and 6000mA IOUT =0 and 6000mA Group A Subgroups Device Types Units Limits Min Max 4,5,6 01 10 ms 4,5,6 4,5,6 4,5,6 01 01 01 500 25 25 mV pk ms ms Notes to Specifications 1 2 3 4 Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. Output voltage measured at load with remote sense leads connected across load. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on. 5 Parameter shall be tested as part of design characterization and after design or process changes. Thereafter parameters shall be guaranteed to the limits specified in table II. 6 An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 7 Load step transition time between 2 and 10 microseconds. 8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent load. 9 Input step transition time between 2 and 10 microseconds. 10 Turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input. www.irf.com 5 ATR28XXS Series Specifications ATR2812S ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50V Soldering Temperature 300°C for 10 seconds Case Temperature Operating -55°C to +125°C Storage -65°C to +135°C Table III. Electrical performance Characteristics Test Symbol Output voltage VOUT 1 IOUT VRIP 3 VRLINE Output current 2 Output ripple voltage Line regulation Load regulation 3 VRLOAD Input current IIN Input ripple current 2 IRIP Efficiency EFF Isolation ISO Capacitive load 4, 5 Power dissipation load fault Switching frequency Sync frequency range Output response to step 7 transient load changes Recovery time step 7, 8 transient load changes CL PD Conditions -55°C ≤ TC ≤ +125°C VIN = 28VDC ±5%, CL = 0 Unless otherwise specified IOUT = 0 VIN = 16, 28, and 40 VDC VIN = 16, 28, and 40 VDC B.W. = 20Hz to 2 MHz VIN = 16, 28, and 40 VDC IOUT = 0, 1250, and 2500mA VIN = 16,28, and 40 VDC IOUT = 0, 1250, and 2500mA IOUT = 0, inhibit (pin 2) Tied to input return (pin 10) IOUT = 0, inhibit (pin 2) = open IOUT =2500mA B.W. = 20Hz to 2 MHz IOUT=2500mA Input to output or any pin To case (except pin 8) at 500 VDC, TC =+25°C No effect on dc performance TC =+25°C 6 Overload, TC = +25°C Device Types 1 2,3 1,2,3 1,2,3 01 Limits Units Min Max 11.88 11.70 12.12 12.30 2500 60 01 01 01 FS FSYNC VOTLOAD TTLOAD Short Circuit IOUT = 2500mA IOUT = 2500mA 1250mA to/from 2500mA 200mA to/from 1250mA 1250mA to/from 2500mA mV 01 mV ±120 18 2,3 1,2,3 01 mA 50 75 50 01 1 2,3 1 01 4 01 01 80 75 100 VOTLINE Input step 16V to/from 40VDC, IOUT = 2500mA mAp-p % MΩ 500 1 1,2,3 4,5,6 4,5,6 4,5,6 4,5,6 4 5,6 4 5,6 4,5,6 mA mVp-p ±60 ±60 2,3 1 1 2,3 1,2,3 V ±30 1 µF 12 01 200mA to/from 1250mA Output response to transient step line 5, 9 changes Group A Subgroups 01 01 01 01 01 W 500 500 -800 -1000 9 600 700 +800 +1000 100 200 100 200 ±1200 KHz KHz mV pk µs mV pk For Notes to Specifications, refer to page 7 6 www.irf.com ATR28XXS Series ATR2812S Table III. Electrical performance Characteristics - continued Test Recovery time transient 5, 8, 9 step line changes Turn on overshoot 10 Turn on delay 5, 10 Load fault recovery Symbol TTLINE VTonOS TonD TrLF Conditions -55°C ≤ TC ≤ +125°C VIN = 28VDC ±5%, CL = 0 Unless otherwise specified Input step 16V to/from 40VDC, IOUT = 2500mA IOUT =0 and 2500mA IOUT =0 and 2500mA Group A Subgroups Device Types Units Limits Min Max 4,5,6 01 10 ms 4,5,6 4,5,6 4,5,6 01 01 01 800 25 25 mV pk ms ms Notes to Specifications 1 2 3 4 Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. Output voltage measured at load with remote sense leads connected across load. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on. 5 Parameter shall be tested as part of design characterization and after design or process changes. Thereafter parameters shall be guaranteed to the limits specified in table III. 6 An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 7 Load step transition time between 2 and 10 microseconds. 8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of V OUT at 50 percent load. 9 Input step transition time between 2 and 10 microseconds. 10 Turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input. www.irf.com 7 ATR28XXS Series Specifications ATR2815S ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50V Soldering Temperature 300°C for 10 seconds Case Temperature Operating -55°C to +125°C Storage -65°C to +135°C Table IV. Electrical performance Characteristics Test Symbol Output voltage Output current VOUT 1 IOUT Output ripple voltage Line regulation 3 3 Load regulation VRLINE 3 VRLOAD Input current IIN Input ripple current Efficiency 2 IRIP 4 EFF Isolation Capacitive load VRIP ISO 4, 5 CL Power dissipation load fault PD Conditions -55°C ≤ TC ≤ +125°C VIN = 28VDC ±5%, CL = 0 Unless otherwise specified IOUT = 0 VIN = 16, 28, and 40 VDC each output. VIN = 16, 28, and 40 VDC B.W. = 20Hz to 2 MHz VIN = 16, 28, and 40 VDC IOUT = 0, 1250, and 2500mA VIN = 16,28, and 40 VDC IOUT = 0, 1250, and 2500mA IOUT = 0, inhibit (pin 2) Tied to input return (pin 10) IOUT = 0, Inhibit (pin 2) = open IOUT = 2500mA B.W. = 20Hz to 2 MHz IOUT = 2500mA Input to output or any pin to case (except pin 7) at 500 VDC, TC =+25°C No effect on dc performance, TC =+25°C. Total for both outputs 6 Overload, TC = +25°C Device Types 1 2,3 1,2,3 01 1,2,3 Units Limits Min Max 14.85 14.60 01 15.15 15.40 2000 mA 01 ±75 mVp-p 01 mV ±75 ±75 2,3 1 01 mV ±150 18 2,3 1,2,3 01 1 2,3 1,2,3 Switching frequency Sync frequency range Output response to step 7 transient load changes Recovery time step 7, 8 transient load changes FS FSYNC VOTLOAD TTLOAD Short Circuit IOUT = 2500mA IOUT = 2500mA 1000mA to/from 2000mA 167mA to/from 1000mA 1000mA to/from 2000mA mA 75 100 50 01 1 2,3 1 01 4 01 01 79 75 100 167mA to/from 1000mA VOTLINE Input step 16V to/from 40VDC, IOUT = 2000mA mAp-p % MΩ 500 1 1,2,3 4,5,6 4,5,6 4,5,6 4,5,6 4 5,6 4 5,6 4,5,6 V ±35 1 µF 12 01 4 Output response to transient step line 5, 9 changes Group A Subgroups 01 01 01 01 01 W 500 500 -1000 -1000 9 600 700 +1000 +1000 100 200 100 200 ±1500 KHz KHz mVp-k µs mVpk For Notes to Specifications, refer to page 9 8 www.irf.com ATR28XXS Series Table IV. Electrical performance Characteristics - continued Test Recovery time transient 5, 8, 9 step line changes Turn on overshoot 10 Turn on delay 5, 10 Load fault recovery Symbol TTLINE VTonOS TonD TrLF Conditions -55°C ≤ TC ≤ +125°C VIN = 28VDC ±5%, CL = 0 Unless otherwise specified Input step 16V to/from 40VDC, IOUT = 2500mA IOUT =0 and 2000mA IOUT =0 and 2000mA ATR2815S Limits Group A Subgroups Device Types 4,5,6 01 10 ms 4,5,6 4,5,6 4,5,6 01 01 01 1000 25 25 mVpk ms ms Min Units Max Notes to Specifications 1 2 3 4 5 6 7 8 9 10 Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. Output voltage measured at load with remote sense leads connected across load. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on. Parameter shall be tested as part of design characterization and after design or process changes. Thereafter parameters shall be guaranteed to the limits specified in table IV. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is condition of maximum power dissipation. Load step transition time between 2 and 10 microseconds. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent l load. Input step transition time between 2 and 10 microseconds. Turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin2) while power is applied to the input. www.irf.com 9 ATR28XXS Series ATR28XXS Block Diagram 1 +In put EM I F ilter P rim a ry H o useke ep in g S u pp ly 2 E n ab le 8 C a se 5 +V o ut 4 R e turn D rive P u lse W id th FB M o du la tor 9 S ync CS 6 +S e nse E rror Am p & Ref 3 -S e nse Inp ut R e turn 10 Application Information Thermal Management Inhibit Function Assuming that there is no forced air flow, the package temperature rise above ambient (∆T) may be calculated using the following expression: Connecting the inhibit input (Pin 2) to input common (Pin 10) will cause the converter to shut down. It is recommended that the inhibit pin be driven by an open collector device capable of sinking at least 400µA of current. The open circuit voltage of the inhibit input is 11.5 ±1 VDC. EMI Filter An Optional EMI filter (AFC461)is available that will reduce the input ripple current to levels below the limits imposed by MIL-STD-461B CEO3. Output Voltage Adjustment The output voltage of the ATR2805S converter can be adjusted upward by connecting an appropriate resistor value between the Positive Output (Pin 5) and the Positive Sense (Pin 6) as shown in Table 1 below. Resistance Pin 5 to 6 (Ω) 109 240 400 600 857 1200 Output Voltage Increase (V) 0.1 0.2 0.3 0.4 0.5 0.6 Table1 Output adjustment resistor values for ATR2805S Device Synchronization Whenever multiple DC/DC converters are utilized in a single system, significant low frequency noise may be generated due to slight difference in the switching frequencies of the converters. Because of the low frequency nature of this noise (typically less than 10KHz), it is difficult to filter out and may interfere with proper operation of sensitive systems. Advanced Analog permits synchronization of multiple ATR28XX converters to match switching frequency of the converter to the frequency of the system clock, thus eliminating this type of noise. 10 ∆T = 80 A –0.7 P 0.85 (°C) where A = the effective surface area in square inches (Including heat sink if used),Pd = power dissipation in watts. The total surface area of the ATR package is 7.34 square inches. If a worse case full load efficiency of 76% is assumed, then the case temperature rise of an ATR2805S can be calculated as follows: 1 1 P = Pout − 1 = 30 − 1 = 9.5W Eff 76 ∆T = 80 (7.34)-0.7 (9.5)0.85 = 134°C Hence, if TAMBIENT = +25°C, the DC/DC converter case temperature will be approximately 159°C if no heat sink or air flow is provided. To calculate the heat sink area required to maintain a specific case temperature rise, the above equation may be manipulated as follows: ∆T AHEATSINK = 0.85 80Pd −1.43 − APKG As an example, if a maximum case temperature rise of 50°C above ambient is required, then the required effective heat sink area is: 50 AHEATSINK = 0.85 80(9.5 ) −1.43 − 7.34 = 22.9in 2 www.irf.com ATR28XXS Series ATR28XXS Case Outlines Non-Flanged Flanged Ø 0.162 2 H oles 0.050 0.800 6 10 8 7 4 5 4 X 0.400 =1.600 3 2.110 M ax 2 2.550 1 2.880 M ax 9 0.040 D X 0.26 L Pins 2.110 0.390 M ax 0.390 M ax 1.110 Pin Designation Part Numbering ATR 28 15 S F / CH Pin No. 1 Designation Positive Input Model Input Voltage 28 = 28V Nominal 2 Enable Input 3 Return Sense* 4 Output Return 5 Positive Output 6 Positive Sense* 7 N/C 8 Case Ground 9 Sync. 10 Input Common Output Voltage Single - 03R3 = 3.3V, 05 = 5V 12 = 12V, 15 = 15V Dual - 12 = ±12V, 15 = ±15V Triple - 12 = 5V,±12V 15 = 5V,±15V Screening – , ES, HB, CH Package Style F = Flange Omit for Non-flange Outputs S = Single D = Dual T = Triple * If neither remote sense nor voltage trim is used, connect Pin 3 to 4 and 5 to 6 or output voltage will increase by 1.2V. www.irf.com 11 ATR28XXS Series Available Screening Levels and Process Variations for ATR28XXS Series Requirement MIL-STD-883 Method Temperature Range Element Evaluation Internal Visual Temperature Cycle Constant Acceleration Burn-in Final Electrical (Group A) No Suffix -20 to +85°C ES Suffix -55°C to +125°C HB Suffix -55°C to +125°C CH Suffix -55°C to +125°C MIL-PRF-38534 2017 1010 ∗ 2001 Seal, Fine & Gross External Visual Yes Cond B Yes Cond C Yes Cond C 500g Cond A Cond A 1015 MIL-PRF38534 48hrs @ 85°C 25°C 48hrs @ 125°C 25°C 160hrs @ 125°C -55, +25, +125°C 160hrs @ 125°C -55, +25, +125°C 1014 ∗ Cond A, C Cond A, C Cond A, C 2009 ∗ Yes Yes Yes * Per Commercial Standards Available Standard Military Drawing (SMD) Cross Reference Standard Military drawing PIN 5962-9462401 5962-9462501 5962-9462601 Vendor CAGE Code 52467 52467 52467 Vendor Similar PIN ATR2805S/CH ATR2812S/CH ATR2815S/CH WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105 IR SANTA CLARA: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500 Visit us at www.irf.com for sales contact information. Data and specifications subject to change without notice. 04/2004 12 www.irf.com