LAMBDA ADVANCED ANALOG INC. λ ATW2800D Series Dual Output, Hybrid - High Reliability DC/DC Converter DESCRIPTION The ATW2800D 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-704 input requirements, these devices have nominal 28VDC inputs with ±12V and ±15V dual outputs to satisfy a wide range of requirements. The circuit design incorporates a pulse width modulated push-pull topology operating in the feed-forward mode at a nominal switching frequency of 270KHz. 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. Refer to Part Number section for more severe enviroments. Manufactured in a facility fully qualified to MIL-PRF38534, these converters are available in four screening grades to satisfy a wide range of requirements. The CH grade is fully compliant to the requirements of MIL-PRF-38534 for class H. The HB grade is processed and screened to the class H requirement, but may not necessarily meet all of the other MIL-PRF-38534 requirements, e.g., element evaluation and Periodic Inspection (P.I.) not required. Both grades are tested to meet the complete group "A" test specification over the full military temperature range without output power deration. Two grades with more limited screening are also available for use in less demanding applications. Variations in electrical, mechanical and screening can be accommodated. Contact Lambda Advanced Analog for special requirements. FEATURES n 18 To 40 Volt Input Range (28VDC Nominal) n ± 12 and ± 15 Volt Outputs Available n Indefinite Short Circuit and Overload Protection n 3 22.8 W/in Power Density n 30 Watts Output Power n Fast Loop Response For Superior Transient Characteristics n Operating Temperature Range From -55°C to +125°C Available n Popular Industry Standard Pin-Out n Resistance Seam Welded Case For Superior Long Term Hermeticity n Efficiencies Up to 85% n Shutdown From External Signal n Full Military Screening n 200,000 Hour MTBF at 85°C n MIL-PRF-38534 Compliant Versions Available SPECIFICATIONS ATW2812D ABSOLUTE MAXIMUM RATINGS Input Voltage Soldering Temperature Case Temperature -0.5V to 180V 300°C for 10 seconds Operating-55°C to +125°C Storage -65°C to +135°C TABLE I. 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 ±11.88 ±12.12 ±11.76 ±12.24 250 2250 V Output current 1/ 2/ IOUT VIN = 18, 28, and 40 V dc, each output 1,2,3 All Output ripple voltage 3/ VRIP VIN = 18, 28, and 40 V dc, B.W. = 20 Hz to 2 MHz 1,2,3 All 85 mV p-p Line regulation 4/ VRLINE VIN = 18, 28, and 40 V dc, IOUT = 0, 1250, and 2500 mA 1 All 30 mV 2,3 mA 60 Load regulation 4/ VRLOAD VIN = 18, 28, and 40 V dc, IOUT = 0, 1250, and 2500 mA 1,2,3 All 120 mV Cross regulation 5/ VRCROS 10 percent to 90 percent load change 1,2,3 All 3.5 % Input current IIN IOUT = 0, inhibit (pin 8) tied to input return (pin 10) 1,2,3 All 18 mA IOUT = 0, inhibit (pin 8) = open Input ripple current 3/ 4/ IRIP IOUT = 2500 mA, B.W. = 20 Hz to 2 MHz Efficiency 4/ EFF Isolation 50 1,2,3 All 50 IOUT = 2500 mA, TC = +25°C 1 All 80 ISO Input to output or any pin to case (except pin 7) at 500 V dc, TC = +25°C 1 All 100 Capacitive load 6/ 7/ CL No effect on dc performance, TC = +25°C, total for both outputs 4 All 200 µF Power dissipation load fault PD Overload, TC = +25°C 8/ 1 All 12 W % MΩ 9 Short circuit, TC = +25°C See footnotes at end of table. 2 mA p-p ATW2812D TABLE I. 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/ FS VOTLOA IOUT = 2500 mA 4,5,6 01 250 300 02 250 270 03 275 300 1250 mA to/from 2500 mA 4,5,6 All -400 +400 0 mA to/from 2500 mA 4,5,6 All -800 +800 1250 mA to/from 2500 mA 4,5,6 All 70 0 mA to/from 1250 mA 4,5,6 All 500 1250 mA to/from 0 mA 4,5,6 All 5 Output response transient step line changes 4/ 7/ 11/ VOTLINE Input step from/to 18 to 40 V dc, IOUT = 2500 mA 4,5,6 All Recovery time transient step line changes 4/ 7/ 10/ 11/ TTLINE Input step from/to 18 to 40 V dc, IOUT = 2500 mA 4,5,6 Turn on overshoot 4/ VTonOS IOUT = 0 and 2500 mA Turn on delay 4/ 12/ TonD IOUT = 0 and 2500 mA Load fault recovery TrLF Weight Max KHz mV pk D TTLOAD 7/ Unit Flange -800 µs ms +800 mV pk All 4000 µs 4,5,6 All 750 4,5,6 All 14 ms 4,5,6 All 14 ms 75 grams mV pk Notes: 1/ 2/ 3/ 4/ 5/ 6/ 7/ 8/ 9/ 10/ 11/ 12/ Parameter guaranteed by line load, and cross regulation tests. Up to 90 percent of full power is available from either output provided the total output does not exceed 30 W. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. Load current split equally between +VOUT and -VOUT. Three-watt load on output under test, 3 watt to 27 watt load change on other output. 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 I. 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. 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 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 (pin 8) while power is applied to the input. 3 SPECIFICATIONS ATW2815D ABSOLUTE MAXIMUM RATINGS Input Voltage Soldering Temperature Case Temperature -0.5V to 180V 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 = 28VDC ±5%, CL = 0 Unless Otherwise Specified Group A Subgroups Device type Limits Min Output Voltage VOUT VIN = 18, 28, 40 VDC IOUT = 0 Unit Max 1 ALL ±14.85 ±15.15 VDC 2, 3 ALL ±14.70 ±15.30 VDC 0.200 2000 mADC 85 mVp-p Output Current 11/ 13/ IOUT VIN = 18, 28, 40 VDC 1, 2, 3 ALL Output Ripple Voltage 8/ VRIP VIN = 18, 28 40 VDC B.W. = DC TO 1 MHz 1, 2, 3 ALL Output Power 4/ 11/ POUT VIN = 18, 28, 40 VDC 1, 2, 3 ALL Line Regulation 9/ 10/ VRLINE VIN = 18, 28, 40 VDC IOUT = 0, 1000, 2000 mA 1 ALL 35 mV 2, 3 ALL 75 mV 30 W Load Regulation 9/ 10/ VRLOAD VIN = 18, 28, 40 VDC IOUT = 0, 1000, 2000 mA 1, 2, 3 ALL 150 mV Input Current IIN IOUT=0, inhibit (pin 8) = 0 1, 2, 3 ALL 12 mADC IOUT=0, inhibit (pin 8) Open 1, 2, 3 ALL 30 mADC 60 mAp-p Input Ripple Current IRIP IOUT = 2000mA 1, 2, 3 ALL Efficiency EFF IOUT = 2000mA TC = 25°C 1 ALL 80 % Isolation ISO Input to output or any pin to case (except pin 8) at 500 VDC, TC = 25°C 1 ALL 100 Mohms Capacitive Load 6/ 12/ CL No effect on DC performance TC = 25°C 4 ALL 500 ufd Power dissipation load fault PD Overload, TC = 25°C 3/ 1 ALL 9 W Short Circuit, TC = 25°C 1 ALL 9 W IOUT = 2000 mA 1, 2, 3 01 237 263 KHz 1, 2, 3 02 230 245 KHz 1, 2, 3 03 250 265 KHz Switching frequency FS See footnotes at end of table. 4 ATW2815D TABLE II - Electrical Performance Characteristics (continued) Test Symbol Conditions -55°C ≤ TC ≤ +125°C VIN = 28VDC ±5%, CL = 0 UNLESS OTHERWISE SPECIFIED Group A Subgroups Device Type Limits Min Output response to step transient load changes 7/ 9/ 10/ Recovery time, step transient load changes 1/ 7/ Output response to transient step line changes 5/ 12/ Recovery time transient step line changes 1/ 5/ 12/ VOTLOAD TTLOAD VOTLINE TTLINE Unit Max 50% load to/from 100% load 4, 5, 6 All -300 +300 mV pk No load to 100% load 4, 5, 6 All -800 -800 mV pk 100% load to no load 4, 5, 6 All +800 +800 50% load to/from 100% load 4, 5, 6 All 25 us No load to 50% load 4, 5, 6 All 500 us 50% load to no load 4, 5, 6 All 7 ms Input step from 18 to 40VDC 4, 5, 6 All +180 mV pk Input step from 40 to 18VDC 4, 5, 6 All -600 mV pk Input step from 18 to 40VDC 4, 5, 6 All 400 us Input step from 40 to 18VDC 4, 5, 6 All 400 us Turn-on overshoot VTONOS IOUT = 0, 2000mA 4, 5, 6 All 750 mV pk Turn-on delay 2/ TOND IOUT = 0, 2000mA 4, 5, 6 All 12 ms Load fault recovery 12/ TrLF VIN = 18 to 40 VDC 4, 5, 6 All 12 Weight Flange 75 grams Notes: 1/ 2/ 3/ 4/ 5/ 6/ 7/ 8/ 9/ 10/ 11/ 12/ 13/ Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1% of VOUT at 50% load. 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 8) while power is applied to the input. 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. Above +125°C case, derate output power linearly to 0 at +135°C case. Input step transition time between 2 and 10 microseconds. 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 will interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on. Load step transition time between 2 and 10 microseconds. Bandwidth guaranteed by design. Tested for 20 KHz. Load current split equally between +VOUT and -VOUT. When operating with unbalanced loads, at least 25% of the load must be on the positive output to maintain regulation. Parameter guaranteed by line and load regulation tests. 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. Up to 90% of full power is available from either output provided the total output does not exceed 30 watts. 5 BLOCK DIAGRAM INPUT FILTER 1 3 OUTPUT FILTER 8 CONTROLLER 2 5 ERROR AMP & REF 10 4 PIN DESIGNATION Pin 1 Positive input Pin 10 Pin 2 N/C standard or Pin 9 Synchronization (optional) Pin 3 Positive output Pin 8 Pin 4 Output common Pin 7 Pin 5 Negative output Pin 6 Input common N/C Inhibit Case ground N/C MECHANICAL OUTLINE 2.700 (68.580) 1.345 (34.163) Pin #1 2.360 (59.944) 0.050 max (1.397) 1.950 (49.530) 0.162D 2 places (4.115) 0.500 max (12.700) 4 x 0.400 = 1.600 (10.160) (40.640) 0.040D x 0.260L (1.016) (6.604) 6 1.00 (25.400) 5 6 4 7 3 Bottom 8 View 2 9 1 10 PART NUMBER ATW 28 xx D / x - xxx Synchronization Option Omit for standard MSTR = Master S:V = Slave Model Input Voltage Output Voltage 12 = 12VDC 15 = 15VDC Dual Output Temperature Range Omit for -55°C to +85°C ES = -55°C to +105°C HB = -55°C to 125°C CH = -55°C to 125°C Available Screening Levels and Process Variations for ATW 2800D Series Requirement MIL-STD-883 Method Temperature Range No Suffix ES Suffix HB Suffix CH Suffix -55°C to +85°C -55°C to +125°C -55°C to +125°C -55°C to +125°C Element Evaluation Internal Visual MIL-PRF-38534 ¬ 2017 ü ü ü Temperature Cycle 1010, Cond C Cond A ü ü Constant Acceleration 2001, Cond A 500g 5,000g 5,000g 1015 96hrs @ 105°C 160hrs @ 125°C 160hrs @ 125°C 25°C -55, +25, +125°C -55, +25, +125°C ü ü ü ü ü ü Burn-in Final Electrical (Group A) Specification Seal, Fine & Gross 1014 External Visual 2009 25°C ¬ ¬ per Commercial Standards STANDARDIZED MILITARY DRAWING CROSS REFERENCE Standardized Military Drawing PIN 5962-9210901HZX 5962-9210902HZX 5962-9210903HZX 5962-9161301HZX 5962-9161302HZX 5962-9161303HZX Vendor CAGE Number 52467 52467 52467 52467 52467 52467 Vendor Similar PIN ATW2812D/CH ATW2812D/CH-SLV ATW2812/CH-MSTR ATW2815D/CH ATW2815D/CH-SLV ATW2815D/CH-MSTR 7 APPLICATION INFORMATION Device Synchronization Whenever multiple DC/DC converters are utilized in a single system, significant low frequency noise may be generated due to slight differences in the switching frequencies of the converters (beat frequency noise). Because of the low frequency nature of this noise (typically less than 10 KHz), it is difficult to filter out and may interfere with proper operation of sensitive systems (communications, radar or telemetry). Lambda Advanced Analog offers an option which provides synchronization of multiple AHE/ATW type converters, thus eliminating this type of noise. To take advantage of this capability, the system designer must assign one of the converters as the master. Then, by definition, the remaining converters become slaves and will operate at the masters’ switching frequency. The user should be aware that the synchronization system is failsafe; that is, the slaves will continue operating should the master frequency be interrupted for any reason. The layout must be such that the synchronization output (pin 2) of the master device is connected to the synchronization input (pin 2) of each slave device. It is advisable to keep this run short to minimize the possibility of radiating the 250 KHz switching frequency. The appropriate parts must be ordered to utilize this feature. After selecting the converters required for the system, a ‘MSTR’ suffix is added for the master converter part number and a ‘SLV’ suffix is added for slave part number. See Part Number section. 1 FILTER 10 5 ATW2805S/ES-MSTR 4 +5V COMM 8 3 1 10 ATW2815D/ES-SLV SLAVE 4 5 +15V COMM -15V 2 SYSTEM BUS 1 10 5 ATW2812S/ES-SLV SLAVE 4 +12V COMM 8 Typical Synchronization Connection Diagram Inhibit Function Connecting the inhibit input (Pin 8) 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 400 µA of current. The open circuit voltage of the inhibit input is 11.5 ±1 VDC. EMI Filter An optional EMI filter (AFC461) will reduce the input ripple current to levels below the limits imposed by MIL-STD-461B CEO3. 8 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. These specifications are subject to change without notice. LAMBDA ADVANCED ANALOG INC. λ MIL-PRF-38534 Certified ISO9001 Registered 9847 2270 Martin Avenue Santa Clara CA 95050-2781 (408) 988-4930 FAX (408) 988-2702