AHF2800 Series Hybrid - High Reliability DC/DC Converters DESCRIPTION The AHF Series of DC/DC converters feature single or dual outputs over the full military temperature range. No derating in output power is required, making them suitable for use in rugged military applications. The low profile, small outline package is ideally suited to the tight board space requirements of many industrial and aerospace applications. Designed for nominal 28VDC inputs, this family of converters will meet the requirements of MIL-STD-704D. The basic circuit utilizes a pulse width modulated, feed-forward topology at a nominal switching frequency of 550 KHz. Input to output isolation is achieved through the use of transformers in the forward and feedback circuits. The proprietary magnetic feedback circuit provides for an extremely wide bandwidth control loop with a high phase margin. The closed loop frequency response of this converter family extends to approximately 50 kHz, resulting in superior line and load transient characteristics. This feedback method is also inherently temperature and radiation insensitive. This gives the AHF Series an important advantage over converters that incorporate opto-couplers in their design. These converters are manufactured in a facility certified to MIL-PRF-38534. All processes used to manufacture these converters have been qualified to enable Lambda 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 class H. The HB grade converters are processed to full MIL-PRF-38534 screening but do not have class H element evaluation as required by MIL-PRF-38534. Two grades are fully tested and operate over the full military temperature range without derating of output power. Industrial and commercial grades are also available. Variations in electrical, mechanical and screening can be accommodated. Extensive computer simulation using complex modeling enables rapid design modification to be provided. Contact Lambda Advanced Analog with specific requirements. FEATURES ■ 16 - 40 VDC input range ■ ■ ■ ■ ■ ■ ■ ■ (28 VDC nominal) Single and dual outputs 12 watts output power 22.8 W/in3 power density Low input/output noise (50 mA/60 mV p-p max. respectively) Indefinite short circuit and overload protection Wideband control loop for superior transient characteristics No derating for -55°C to +125°C operation Constant switching frequency (550 kHz nominal) SPECIFICATIONS AHF2812S ABSOLUTE MAXIMUM RATINGS Input Voltage Soldering Temperature Case Temperature -0.5V to 50V 300°C for 10 seconds Operating-55°C to +125°C Storage -65°C to +135°C TABLE II. Electrical Performance Characteristics Test Symbol Conditions -55°C ≤ TC ≤ +125°C VIN = 28 V dc ±5%, CL = 0 unless otherwise specified Group A subgroups Device types Limits Min Output voltage VOUT IOUT = 0 1 01 2,3 Unit Max 11.88 12.12 11.76 12.24 V Output current 1/ IOUT VIN = 16, 28, and 40 V dc, 1,2,3 01 1000 Output ripple voltage 2/ VRIP VIN = 16, 28, and 40 V dc, B.W. = 20 Hz to 2 MHz 1,2,3 01 60 mV p-p Line regulation VRLINE VIN = 16, 28, and 40 V dc, IOUT = 0,500, and 1000 mA 1,2,3 01 50 mV Load regulation VRLOAD VIN = 16, 28, and 40 V dc, IOUT = 0, 500, and 1000 mA 1,2,3 01 50 mV Input current IIN IOUT = 0, inhibit (pin 1) tied to input return (pin 7) 1,2,3 01 12 mA IOUT = 0, inhibit (pin 1) = open Input ripple current 2/ IRIP IOUT = 1000 mA, B.W. = 20 Hz to 2 MHz Efficiency EFF IOUT = 1000 mA, mA 50 1,2,3 01 1 01 2,3 50 78 mA p-p % 75 Isolation ISO Input to output or any pin to case (except pin 6) at 500 V dc, TC = +25°C 1 01 Capacitive load 3/ 4/ CL No effect on dc performance, TC = +25°C 4 01 200 µF Power dissipation load fault PD Overload 5/ 1 01 6 W Short circuit 1,2,3 01 2 IOUT = 1000 mA 4,5,6 01 Switching frequency FS See footnotes at end of table. 2 100 500 MΩ 600 kHz AHF2812S TABLE II. Electrical Performance Characteristics - Continued Test Symbol Conditions -55°C ≤ TC ≤ +125°C VIN = 28 V dc ±5%, CL = 0 unless otherwise specified Group A Subgroups Device types Min Output response to step transient load changes 6/ VOTLOAD 500 mA to/from 1000 mA 4 0 mA to/from 500 mA Recovery time, step transient load changes 6/ 7/ TTLOAD 01 Unit Limits Max -300 +300 5,6 -450 +450 4 -500 +500 5,6 -750 +750 500 mA to/from 1000 mA 4,5,6 01 100 0 mA to 500 mA 4,5,6 01 1500 500 mA to 0 mA 4,5,6 10 mV pk µs ms Output response to transient step line changes VOTLINE Input step 16 V to/from 40 V dc, IOUT = 1000 mA 4/ 8/ 4,5,6 01 1500 Recovery time transient step line changes TTLINE Input step 16 V to/from 40 V dc IOUT = 1000 mA 4/ 7/ 8/ 4,5,6 01 800 µs Turn on overshoot VTonOS IOUT = 0 and 1000 mA 4,5,6 01 600 mV pk Turn on delay TonD IOUT = 0 and 1000 mA 9/ 4,5,6 01 20 ms Load fault recovery 4/ 9/ TrLF 4,5,6 01 20 ms 35 grams Weight mV pk Notes: 1/ Parameter guaranteed by line and load regulation tests. 2/ Bandwidth guaranteed by design. Tested for 20 kHz to 2 MHz. 3/ 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. 4/ 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. 5/ 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. 6/ Load step transition time between 2 and 10 microseconds. 7/ 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. 8/ Input step transition time between 2 and 10 microseconds. 9/ 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 1) while power is applied to the input is unlimited. 3 SPECIFICATIONS AHF2815S ABSOLUTE MAXIMUM RATINGS Input Voltage Soldering Temperature Case Temperature -0.5V to 50V 300°C for 10 seconds Operating-55°C to +125°C Storage -65°C to +135°C TABLE III. Electrical Performance Characteristics Test Symbol Conditions -55°C ≤ TC ≤ +125°C VIN = 28 V dc ±5%, CL = 0 unless otherwise specified Group A subgroups Device types Limits Min Output voltage VOUT IOUT = 0 1 All 2,3 Unit Max 14.85 15.15 14.70 15.30 Output current 1/ IOUT VIN = 18, 28, and 40 V dc, 1,2,3 All 2000 Output ripple voltage 2/ VRIP VIN = 18, 28, and 40 V dc, B.W. = 20 Hz to 2 MHz 1,2,3 All 50 Line regulation VRLINE VIN = 18, 28, and 40 V dc, IOUT = 0, 1000, and 2000 mA 1 All ±35 2,3 V mA mV p-p mV ±75 Load regulation VRLOAD VIN = 18, 28, and 40 V dc, IOUT = 0, 1000, and 2000 mA 1,2,3 All ±150 mV Input current IIN IOUT = 0, inhibit (pin 2) tied to input return (pin 10) 1,2,3 All 18 mA IOUT = 0, inhibit (pin 2) = open Input ripple current 2/ IRIP IOUT = 2000 mA, B.W. = 20 Hz to 2 MHz Efficiency EFF IOUT = 2000 mA, 50 1,2,3 All 1 All 2,3 20 80 mA p-p % 77 Isolation ISO Input to output or any pin to case (except pin 7) at 500 V dc, TC = +25°C 1 All Capacitive load 3/ 4/ CL No effect on dc performance, TC = +25°C 4 All 200 µF Power dissipation load fault PD Overload 1 All 12 W Short circuit 1,2,3 All 9 IOUT = 2000 mA 4,5,6 01, 04 250 300 02, 05 250 270 03, 06 275 300 Switching frequency FS 5/ See footnotes at end of table. 4 100 MΩ kHz AHF2815S TABLE III. Electrical Performance Characteristics - Continued Test Symbol Conditions -55°C ≤ TC ≤ +125°C VIN = 28 V dc ±5%, CL = 0 unless otherwise specified Group A Subgroups Device types Min Output response to step transient load changes 6/ Recovery time, step transient load changes 6/ 7/ VOTLOA 1000 mA to/from 2000 mA 4,5,6 0 mA to/from 1000 mA 4,5,6 All Unit Limits Max -800 +800 -1000 +750 mV pk D TTLOAD 1000 mA to/from 2000 mA 4 All 100 5,6 0 mA to/from 1000 mA 4 µs 200 All 5 5,6 ms 10 Output response to transient step line changes VOTLINE Input step 18 V to/from 40 V dc, IOUT = 2000 mA 4/ 8/ 4,5,6 04 05 06 Recovery time transient step line changes TTLINE Input step 18 V to/from 40 V dc IOUT = 2000 mA 4/ 7/ 8/ 4,5,6 04 05 06 500 µs Turn on overshoot VTonOS IOUT = 0 and 2000 mA 4,5,6 All 750 mV pk Turn on delay TonD IOUT = 0 and 2000 mA 9/ 4,5,6 All 12 ms Load fault recovery 4/ 9/ TrLF 4,5,6 All 12 ms 38 grams Weight -1000 +1000 mV pk Notes: 1/ Parameter guaranteed by line and load regulation tests. 2/ Bandwidth guaranteed by design. Tested for 20 kHz to 2 MHz. 3/ 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 turnon. 4/ 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. 5/ 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. 6/ Load step transition time between 2 and 10 microseconds. 7/ 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. 8/ Input step transition time between 2 and 10 microseconds. 9/ 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. 5 SPECIFICATIONS AHF2812D ABSOLUTE MAXIMUM RATINGS Input Voltage Soldering Temperature Case Temperature -0.5V to 50V 300°C for 10 seconds Operating-55°C to +125°C Storage -65°C to +135°C TABLE V. Electrical Performance Characteristics. Test Symbol Conditions -55°C ≤ TC ≤ +125°C VIN = 28 V dc ±5%, CL = 0 unless otherwise specified Group A subgroups Device types Limits Min Output voltage VOUT IOUT = 0 1 01 2,3 Unit Max ±11.88 ±12.12 ±11.76 ±12.24 100 900 V Output current 1/ 2/ IOUT VIN = 16, 28, and 40 V dc, each output 1,2,3 01 Output ripple voltage 3/ VRIP VIN = 16, 28, and 40 V dc, B.W. = 20 Hz to 2 MHz 1,2,3 01 60 mV p-p Line regulation 4/ VRLINE VIN = 16, 28, and 40 V dc, IOUT = 0, 500, and 1000 mA 1,2,3 01 30 mV Load regulation 4/ VRLOAD VIN = 16, 28, and 40 V dc, IOUT = 0, 500, and 1000 mA 1,2,3 01 30 mV Cross regulation 5/ VRCROS 10 percent to 90 percent load change 1,2,3 01 3.0 % Input current IIN IOUT = 0, inhibit (pin 1) tied to input return (pin 7) 1,2,3 01 12 mA IOUT = 0, inhibit (pin 1) = open Input ripple current 3/ 4/ IRIP IOUT = 1000 mA, B.W. = 20 Hz to 2 MHz Efficiency EFF IOUT = 1000 mA, TC = +25°C 4/ mA 60 1,2,3 01 1,3 01 2 50 77 mA p-p % 74 Isolation ISO Input to output or any pin to case (except pin 6) at 500 V dc, TC = +25°C 1 01 100 Capacitive load 6/ 7/ CL No effect on dc performance, TC = +25°C, total for both outputs 4 01 200 µF Power dissipation load fault PD Overload, TC = +25°C 8/ 1,2,3 01 6 W MΩ 3 Short circuit, TC = +25°C See footnotes at end of table. 6 AHF2812D TABLE V. Electrical performance characteristics - Continued. Test Symbol Conditions -55°C ≤ TC ≤ +125°C VIN = 28 V dc ±5%, CL = 0 unless otherwise specified Group A Subgroups Device types Limits Min Switching frequency 4/ Output response to step transient load changes 4/ 9/ Recovery time, step transient load changes 4/ 9/ 10/ IOUT = 1000 mA 4,5,6 01 500 600 VOTLOAD 500 mA to/from 1000 mA 4,5,6 01 -200 +200 0 mA to/from 500 mA 4,5,6 01 -800 +800 500 mA to/from 1000 mA 4,5,6 01 70 0 mA to/from 500 mA 4,5,6 01 1000 TTLOAD VOTLINE Input step from/to 16 to 40 V dc, IOUT = 1000 mA 4,5,6 01 Recovery time transient step line changes 4/ 7/ 10/ 11/ TTLINE Input step from/to 16 to 40 V dc, IOUT = 1000 mA 4,5,6 Turn on overshoot 4/ VTonOS IOUT = 0 and 1000 mA Turn on delay 4 12/ TonD IOUT = 0 and 1000 mA 7/ Max FS Output response transient step line changes 4/ 7/ 11/ Load fault recovery Unit TrLF Weight -750 kHz mV pk µs +750 mV pk 01 1200 µs 4,5,6 01 600 4,5,6 01 25 ms 4,5,6 01 25 ms 38 grams mV pk Notes: 1/ Parameter guaranteed by line load, and cross regulation tests. 2/ Up to 90 percent of full power is available from either output provided the total output does not exceed 12 W. 3/ Bandwidth guaranteed by design. Tested for 20 kHz to 2 MHz. 4/ Load current split equally between +VOUT and -VOUT. 5/ 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output. 6/ 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. 7/ Parameter shall be tested as part of design characterization and after design or process changes. Thereafter, parameters shall be guaranteed to the limits specified inTable V. 8/ 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. 9/ Load step transition time between 2 and 10 microseconds. 10/ 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. 11/ Input step transition time between 2 and 10 microseconds. 12/ 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 1) while power is applied to the input. 7 SPECIFICATIONS AHF2815D ABSOLUTE MAXIMUM RATINGS Input Voltage Soldering Temperature Case Temperature -0.5V to 50V 300°C for 10 seconds Operating-55°C to +125°C Storage -65°C to +135°C TABLE VI. Electrical Performance Characteristics Test Symbol Conditions -55°C ≤ TC ≤ +125°C VIN = 28 V dc ±5%, CL = 0 unless otherwise specified Group A subgroups Device types Limits Min Output voltage VOUT IOUT = 0 1 01 2,3 Unit Max ±14.85 ±15.15 ±14.70 ±15.30 80 720 V Output current 1/ 2/ IOUT VIN = 16, 28, and 40 V dc, each output 1,2,3 01 Output ripple 3/ voltage VRIP VIN = 16, 28, and 40 V dc, B.W. = 20 Hz to 2 MHz 1,2,3 01 60 mV p-p Line regulation 4/ VRLINE VIN = 16, 28, and 40 V dc, IOUT = 0, 400, and 800 mA 1,2,3 01 35 mV Load regulation 4/ VRLOAD VIN = 16, 28, and 40 V dc, IOUT = 0, 400, and 800 mA 1,2,3 01 35 mV Cross regulation 5/ VRCROS 10 percent to 90 percent load change each output 1,2,3 01 3.0 % Input current IIN IOUT = 0, inhibit (pin 1) tied to input return (pin 7) 1,2,3 01 12 mA IOUT = 0, inhibit (pin 1) = open 55 Input ripple current 3/ 4/ IRIP IOUT = 800 mA, B.W. = 20 Hz to 2 MHz Efficiency EFF IOUT = 800 mA 4/ mA 1,2,3 01 1,3 01 2 50 78 mA p-p % 75 Isolation ISO Input to output or any pin to case (except pin 6) at 500 V dc, TC = +25°C 1 01 100 Capacitive load 6/ 7/ CL No effect on dc performance, TC = +25°C, total for both outputs 4 01 200 µF Power dissipation load fault PD Overload 8/ 1,2,3 01 6 W Short circuit Switching frequency 4/ Output response to step transient load changes 4/ 9/ MΩ 2.5 FS IOUT = 800 mA 4,5,6 01 500 600 VOTLOAD 400 mA to/from 800 mA 4,5,6 01 -200 +200 0 mA to/from 400 mA 4,5,6 01 -800 +800 See footnotes at end of table. 8 kHz mV pk AHF2815D TABLE VI. Electrical Performance Characteristics - Continued. Test Symbol Conditions -55°C ≤ TC ≤ +125°C VIN = 28 V dc ±5%, CL = 0 unless otherwise specified Group A Subgroups Device types Limits Min Recovery time, step transient load changes 4/ 9/ 10/ TTLOAD 4,5,6 01 70 0 mA to/from 400 mA 4,5,6 01 500 VOTLINE Input step from/to 16 to 40 V dc, IOUT = 800 mA 4,5,6 01 Recovery time transient step line changes 4/ 7/ 10/ 11/ TTLINE Input step from/to 16 to 40 V dc, IOUT = 800 mA 4,5,6 Turn on overshoot 4/ VTonOS IOUT = 0 and 800 mA Turn on delay 4/ 12/ TonD IOUT = 0 and 800 mA 7/ Max 400 mA to/from 800 mA Output response transient step line changes 4/ 7/ 11/ Load fault recovery Unit TrLF Weight -750 µs +750 mV pk 01 1200 µs 4,5,6 01 750 4,5,6 01 25 ms 4,5,6 01 25 ms 38 grams mV pk Notes: 1/ Parameter guaranteed by line load, and cross regulation tests. 2/ Up to 90 percent of full power is available from either output provided the total output does not exceed 12 W. 3/ Bandwidth guaranteed by design. Tested for 20 kHz to 2 MHz. 4/ Load current split equally between +VOUT and -VOUT. 5/ 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output. 6/ 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. 7/ 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 VI. 8/ 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. 9/ Load step transition time between 2 and 10 microseconds. 10/ 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. 11/ Input step transition time between 2 and 10 microseconds. 12/ 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 1) while power is applied to the input. 9 BLOCK DIAGRAM (Single Output) 8 INPUT FILTER OUTPUT FILTER 1 Case Ground 4 CONTROLLER ERROR AMP & REF 6 7 3 APPLICATION INFORMATION Inhibit Function Connecting the inhibit input (Pin 1) to input common (Pin 7) 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 400 µA of current. The open circuit voltage of the inhibit input is 11. 5 ±1 V DC. 10 STANDARDIZED MILITARY DRAWING CROSS REFERENCE Thermal Management Assuming that there is no forced air flow, the package termperature rise above ambient (∆T) may be calculated using the following expression: Model ∆T ≈ 80 A -0.7 p 0. 85 ( °C) where A = the effective surface area in square inches (including heat sink if used;) P = power dissipation in watts. Drawing Number AHF2805S/CH AHF2812S/CH SMD #5962-91600 SMD #5962-94568 AHF2815S/CH SMD #5962-94563 AHF2812D/CH SMD #5962-92111 AHF2815D/CH SMD #5962-92351 PART NUMBER AHF 28 xx x F/ x The total surface area of the AHF package is 4.9 square inches. If a worse case full load efficiency of Model 78% is assumed, then the case temperature rise can be calculated as follows: Screening (see table) Omit for -20°C to +85°C ES -55°C to +125°C HB— -55°C to +125°C CH— Class H complaint See table for standard Mlitary drawing number Input Voltage P = POUT 1 -1 EFF [ ] 1 = 12 - 1 = 3.4 W .78 [ ] Output Voltage 05— 5 V DC 12—12 V DC 15—15 V DC ∆T = 80 (4.9)-0.7 (3.4)0.85 = 74°C Hence, if TAMBIENT = +25°C, the DC/DC converter case temperature will be approximately 100°C if no heat sink or air flow is provided. S—Single D—Dual Package Option Omit For Standard F-Flange To calculate the heat sink area required to maintain a specific case temperature rise, the above equation may be manipulated as follows: A HEAT SINK = [ ∆T ] 80P 0.85 -1.43 -A PKG As an example, if a maximum case temperature rise of 50°C above ambient is desired, then the required effective heat sink area is: A HEAT SINK = [ 50 ] -1.43 -4.9 = 3.75 in.2 0.85 80 (3.4) Available Screening Levels and Process Variations for AHF Series R e quir e me nt M I L-STD-883 M e t hod Temperature Range No No Suffix ES ES Suffix HB HB Suffix CH CH Suffix - 20 to +85°C - 55°C to +125°C - 55°C to +125°C - 55°C to +125°C Element Evaluation MIL- PRF- 38534 Internal Visual 2017 Temperature Cycle Yes Yes Yes 1010 Cond B Cond C Cond C Constant Acceleration 2001 500g Cond A Cond A Burn- in 1015 96hrs @ 125°C 96hrs @ 125°C 160hrs @ 125°C 160hrs @ 125°C MIL- PRF- 38534 25°C 25°C - 55, +25, +125°C - 55, +25, +125°C Seal, Fine & Gross 1014 * Cond A, C Cond A, C Cond A, C External Visual 2009 * Yes Yes Yes Final Electrical (Group A) * * Per Commercial Standards 11 MECHANICAL OUTLINE 0.03 DIA. 8 Pins (0.76) 0.205 (5.21) 0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1 8 2 3 7 1.105 (28.07) 1.450 (36.83) 4 5 6 0.09 R Typ (2.29) 0.800 (20.32) 1.120 (28.45) 0.330 (8.38) MAX 0.26 (6.60) Tolerances: .xx =±0.010, .xxx= ±0.005 PIN DESIGNATION Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 AHF2805S AHF2812S AHF2815S Inhibit input Pin 8 Positive input N/C Output common Pin 7 Input common Positive output N/C Pin 6 Case ground Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 AHF2805D AHF2812D AHF2815D Inhibit input Pin 8 Positive input Positive output Output common Pin 7 Input common Negative output N/C Pin 6 Case Ground 8 1 2 3 TOP VIEW 7 4 5 12 6 NOTES 13 NOTES © Lambda Advanced Analog The information in this data sheet has been carefully checked and is believed to be accurate, however, no responsibility is assumed for possible errors. The specifications are subject to change without notice. MIL-PRF-38534 Certified 9847 2270 Martin Avenue Santa Clara CA 95050-2781 (408) 988-4930 FAX (408) 988-2702