PD - 94557 ATW28XXD SERIES 28V Input, Dual Output ADVANCED ANALOG HYBRID-HIGH RELIABILITY DC/DC CONVERTERS Description The ATW28XXD 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 operate with a nominal 28 VDC 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 elements in the feedback circuits. Three standard temperature grades are offered. Refer to Part Number section for more severe environments. 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 MILPRF-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 (PI) 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 a more limited screening are also available for use in less demanding applications. Variations in electrical, mechanical and screening can be accommodated. Contact Advanced Analog for special requirements. www.irf.com ATW Features n 18 to 40 VDC Input Range (28 VDC Nominal) n ±12V and ±15V Outputs Available n Indefinite Short Circuit and Overload Protection 3 n 22.8 W/in Power Density n 30 W 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 1 10/24/02 ATW28XXD Series Specifications ATW2812D 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 I. Electrical Performance Characteristics Test Symbol Output voltage Output current 1, 2 Output ripple voltage Line regulation 3 4 VOUT IOUT = 0 IOUT VIN = 18, 28, and 40 V dc, each output VIN = 18, 28, and 40 V dc, B.W. = 20Hz to 2MHz VIN = 18, 28, and 40 V dc, Iout = 0,1250, and 2500mA VRIP VRLINE 4 Conditions -55°C ≤Tc ≤+125°C Vin = 28 Vdc ±5%, CL = 0 Unless otherwise specified VRLOAD Group A Subgroups Device Types 1 2,3 1,2,3 All All 1,2,3 mA All 85 mVp-p 1 All 30 mV 2,3 1,2,3 All 60 120 mV 1,2,3 1,2,3 All All 3.5 18 % mA 1,2,3 All 50 50 mAp-p 1 All 80 % 1 All 100 MΩ 4 All 200 µF 1 All 12 W 250 250 275 -400 -800 PD FS Short circuit, TC = +25°C IOUT = 2500mA 4,5,6 Output response to step transient load 4, 9 changes VOTLOAD 1250mA to/from 2500mA 4,5,6 01 02 03 All Recovery time step transient load 4, 9, 10 changes TTLOAD 0mA to/from 2500mA 1250mA to/from 2500mA 4,5,6 4,5,6 All All 0mA to/from 1250mA 1250mA to/from 0mA 4,5,6 4,5,6 All All Cross regulation Input current 5 Input ripple current Efficiency VRCROSS IIN 3, 4 4 EFF Isolation Capacitive load IRIP ISO 6, 7 CL Power dissipation load fault Switching frequency 4 Min ±11.88 ±11.76 250 Unit Max ±12.12 ±12.24 2250 VIN = 18, 28, and 40 V dc, IOUT = 0, 1250, and 2500mA 10% to 90% load change IOUT = 0, inhibit (pin 8) tied to input return (pin 10) IOUT = 0,inhibit (pin 8)= open IOUT = 2500mA B.W. = 20Hz to 2MHz IOUT = 2500mA TC = +25°C Input to output or any pin to case (except pin 7) at 500 V dc Tc = +25°C No effect on dc performance, Tc = +25°C, total for both outputs 8 Overload, TC = +25°C Load regulation Limits V 9 300 270 300 +400 mV pk +800 70 µs 500 5 ms KHz For Notes to Specifications, refer to page 3 2 www.irf.com ATW28XXD Series ATW2812D Table I. Electrical Performance Characteristics - continued Test Output response transient step line 4, 7, 11 changes Recovery time transient step line 4, 7, 10, 11 change Turn on overshoot 4, 12 Turn on delay 4 Load fault recovery Weight Symbol Conditions -55°C ≤Tc ≤+125°C Vin = 28 Vdc ±5%, CL = 0 unless otherwise specified Group A Subgroups Device Types VOTLINE Input step from/to 18 to 40 Vdc, IOUT = 2500mA 4,5,6 All TTLINE Input step from/to 18 to 40 Vdc, IOUT = 2500mA 4,5,6 IOUT = 0 and 2500mA IOUT = 0 and 2500mA VTonOS TonD 7 TrLF Limits Unit Min Max -800 +800 mV pk All 4000 µs 4,5,6 4,5,6 All All 750 14 mV pk ms 4,5,6 All 14 75 ms grams Flange Notes to Specifications 1 2 3 4 5 6 7 8 9 10 11 12 Parameter guaranteed by line, load and cross regulation tests. Up to 90% of full power is available from either output provided the total output does not exceed 30W. Bandwidth guaranteed by design. Tested for 20KHz to 2MHz. 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 ground signal from the inhibit pin (pin 8) while power is applied to the input. www.irf.com 3 ATW28XXD Series Specifications ATW2815D 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 Output voltage VOUT 11, 13 Output current 8 Output ripple voltage 4, 11 Output Power 9, 10 Line regulation 9, 10 IOUT VRIP POUT VRLINE Conditions -55°C ≤Tc ≤+125°C Vin = 28 Vdc ±5%, CL = 0 Unless otherwise specified VIN = 18, 28, and 40 Vdc IOUT = 0 VIN = 18, 28, and 40 V dc VIN = 18, 28, and 40 V dc, B.W. = DC to MHz VIN = 18, 28, 40 Vdc VIN = 18, 28, and 40 V dc, Iout = 0, 1000, and 2000mA Power dissipation load fault PD VIN = 18, 28, and 40 V dc, IOUT = 0, 1000, and 2000mA IOUT = 0, inhibit (pin 8) IOUT = 0, inhibit (pin 8) = open IOUT = 2000mA IOUT = 2500mA TC = 25°C Input to output or any pin to case (except pin 8) at 500V dc Tc = 25°C No effect on dc performance, Tc = 25°C 3 Overload, TC = +25°C Switching frequency FS Short circuit, TC = +25°C IOUT = 2000mA Load regulation Input current IIN Input ripple current Efficiency Isolation Capacitive load VRLOAD 6, 12 Output response to step transient 7, 9, 10 load changes Recovery time step 1, 7 transient load changes IRIP EFF ISO CL Group A Subgroups Device Types 1 2,3 1,2,3 1,2,3 All All All All 1,2,3 1 All All 2,3 1,2,3 Limits Max ±15.15 ±15.30 2000 85 VDC VDC mADC mVp-p 35 W mV All All 75 150 mV mV 1,2,3 1,2,3 1,2,3 1 1 All All All All All 12 30 60 mADC mADC mAp-p % MΩ 4 All 500 µF 1 All 9 W All 01 02 03 All 9 263 245 265 +300 W KHz KHz KHz mV pk -800 +800 25 mV pk mV pk µs 500 7 µs ms VOTLOAD 50% load to/from 100% load 1 1,2,3 1,2,3 1,2,3 4,5,6 TTLOAD No load to 100% load 100% load to no load 50% load to/from 100% load 4,5,6 4,5,6 4,5,6 All All All No load to 50% load 50% load to no load 4,5,6 4,5,6 All All Min ±14.85 ±14.70 0.200 Unit 30 80 100 237 230 250 -300 -800 +800 For Notes to Specifications, refer to page 5 4 www.irf.com ATW28XXD Series Table II. Electrical Performance Characteristics - continued Test Symbol ATW2815D Group A Subgroups Device Types Input step from/to 18 to 40VDC 4,5,6 All +180 mV pk Input step from 40 to18 VDC Input step from/to 18 to 40 VDC 4,5,6 4,5,6 All All -600 400 mV pk µs Input step from 40 to 18 VDC IOUT = 0 and 2000mA IOUT = 0 and 2000mA 4,5,6 4,5,6 4,5,6 All All All 400 750 12 µs mV pk ms VIN = 18 to 40 VDC Flange 4,5,6 All 12 75 ms grams Conditions -55°C ≤Tc ≤+125°C Vin = 28 Vdc ±5%, CL = 0 unless otherwise specified Limits Min Output response transient step line 5, 12 changes VOTLINE Recovery time transient step line 1. 5, 12 changes TTLINE Turn on overshoot 2 Turn on delay VTonOS TonD Load fault recovery Weight 12 TrLF Unit Max Notes to Specifications 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 20KHz to 2MHz. 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. www.irf.com 5 ATW28XXD Series ATW28XXD Block Diagram 3 + V out 1 + In put EMI F ilter 4 R eturn E nable 2 S ync 5 -V out D rive 1 8 D rive 2 P u lse W idth M odu lator E rror A m p & R eference FB In put R eturn 10 Application Information 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 400µA of current. The open circuit voltage of the inhibit input is 11.5 ±1 VDC. EMI Filter An optional external EMI filter (AFC461) is available that will reduce the input ripple current to levels below the limits imposed by MIL-STD-461B CEO3. Device Synchronization Whenever multiple DC/DC converters are utilized in a single system, significant low frequency noise may be generated due to the slight differences in the switching frequencies of the converters (beat frequency noise). 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 (communications, radar or telemetry). Advanced Analog offers an option, which allows 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 fail-safe; 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 250KHz 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. Typical Synchronization Connection + In R e turn A F C 461 or A F V 46 1 O u tp ut + In C a se R e turn O u tp ut A T W 28xxS R e turn R e turn M STR S ystem B us + In A T W 28xxD O u tp ut or O ther R e turn R e turn C om patab le O u tp ut C a se S LV O u tp ut + In C a se A T W 28xxD R e turn O u tp ut R e turn S LV 6 www.irf.com ATW28XXD Series ATW28XXD Case Outlines 1.000 0.05 10 8 3 7 2 4 6 1 9 0.040 D X 0.26 L P ins 5 4 X 0.400 =1.600 1.95 2.700 M ax 2.360 0.500 M ax 1.350 M ax Part Numbering Pin Designation ATW 28 15 D / CH - M STR Pin No. Designation S yn c O p tio n M od e l 1 Positive Input 2 N/C Standard or Sync. ( Optional ) 3 Positive Output 4 Output Return 5 Negative Output 6 N/C 7 Case Ground 8 Enable Inhibit 9 N/C 10 Input Return www.irf.com M S T R = M a s te r S L V = S la v e O m it fo r S ta n d a rd In pu t V o ltag e 2 8 = 2 8 V N o m in a l O u tp ut V olta ge S in g le - 05 , 1 2 , 1 5 V D C D u a l - 1 2 = ±12 V , 1 5 = ±1 5 V S cre e ning – , ES, HB, CH O u tp uts S = S ing le D = Dual 7 ATW28XXD Series Available Screening Levels and Process Variations for ATW28XXD Series Requirement Temperature Range Element Evaluation Internal Visual Temperature Cycle Constant Acceleration Burn-in Final Electrical (Group A) Seal, Fine & Gross External Visual MIL-STD-883 Method No Suffix -20 to +85°C -55°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, Cond C ∗ Yes Cond A Yes Yes Yes Yes 500g 5,000g 5,000g 48hrs @ 105°C 25°C 160hrs @ 125°C -55, +25, +125°C 160hrs @ 125°C -55, +25, +125°C Yes Yes Yes Yes Yes Yes 2001, Cond A 1015 MIL-PRF-38534 & Specification 1014 48hrs @ 85°C 25°C 2009 ∗ * Per Commercial Standards Available Standard Military Drawing (SMD) Cross Reference Standardized Military Drawing Pin 5962-9210901HZX 5962-9210902HZX 5962-9210903HZX 5962-9161301HZX 5962-9161302HZX 5962-9161303HZX Vendor CAGE Code Number 52467 52467 52467 52467 52467 52467 Vendor Similar Pin ATW2812D/CH ATW2812D/CH-SLV ATW2812D/CH-MSTR ATW2815D/CH ATW2815D/CH-SLV ATW2815D/CH-MSTR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331 ADVANCED ANALOG: 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. 10/02 8 www.irf.com