PD-94557A ATW28XXD SERIES 28V Input, Dual Output 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 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 elements in the feedback circuits. Manufactured in a facility fully qualified to MIL-PRF38534, these converters are fabricated utilizing DSCC qualified processes. For available screening options, refer to device screening table in the data sheet. Variations in electrical, mechanical and screening can be accommodated. Contact IR Santa Clara for special requirements. www.irf.com ATW Features n n n n n n n n n n n n n n 18V to 40VDC Input Range (28VDC Nominal) ±12V and ±15V Outputs Available Indefinite Short Circuit and Overload Protection 3 22.8W/in Power Density 30W Output Power Fast Loop Response for Superior Transient Characteristics Operating Temperature Range from -55°C to +125°C Available Popular Industry Standard Pin-Out Resistance Seam Welded Case for Superior Long Term Hermeticity Efficiencies up to 85% Shutdown from External Signal Full Military Screening 200,000 hour MTBF at 85°C Standard Microcircuit Drawings Available 1 12/14/06 ATW28XXD Series Specifications ATW2812D Absolute Maximum Ratings Input voltage -0.5V to +50VDC Soldering temperature 300°C for 10 seconds Operating case temperature -55°C to +125°C Storage case temperature -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 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 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 VRLOAD 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 50 1,2,3 All 50 mAp-p 1 All 80 % 1 All 100 MΩ 4 All 200 µF 1 All 12 W 250 250 275 -400 -800 9.0 300 270 300 +400 mV pk +800 70 µs 500 5.0 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 4 Turn on overshoot 4, 12 Turn on delay Load fault recovery Weight 7 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 TrLF Flange Limits Min -800 Unit Max +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 g 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 –V OUT. Three-watt load on output under test, 3.0W to 27W 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 2.0µs and 10µs. Recovery time is measured from the initiation of the transient to where V OUT has returned to within ±1.0% of V OUT at 50%load. Input step transition time between 2.0µs and 10µs. 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 -0.5V to +50VDC Soldering temperature 300°C for 10 seconds Operating case temperature -55°C to +125°C Storage case temperature -65°C to +135°C Table II. Electrical Performance Characteristics Test Symbol Output voltage VOUT 11, 13 Output current Output ripple voltage 8 4, 11 Output Power Line regulation 9, 10 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 9.0 W All 01 02 03 All 9.0 263 245 265 +300 W KHz KHz KHz mV pk -800 +800 25 mV pk mV pk µs 500 7.0 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 g 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 ±1.0% 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 2.0µs and 10µs. 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 2.0µs and 10µs. 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 30W. www.irf.com 5 ATW28XXD Series Block Diagram 3 +Vout +Input 1 EMI Filter 4 Enable Sync 2 5 -Vout Drive 1 8 Output Return Drive 2 Pulse Width Modulator FB Error Amp & Reference Input Return 10 Application Information Inhibit Function (Enable) 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 ±1.0VDC. 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). International Rectifie roffers 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 Return AFC461 or AFV461 Output + In Case Return Output ATW28xxS Return Return MSTR System Bus + In ATW28xxD Output or Other Return Return Compatable Output Case SLV Output + In Case ATW28xxD Return Output Return SLV 6 www.irf.com ATW28XXD Series Mechanical Outline 1.000 0.05 10 8 3 7 2 4 6 1 9 0.040 D X 0.26 L Pins 5 4 X 0.400 =1.600 1.95 2.700 Max 2.360 0.500 Max 1.350 Max Notes: 1) All dimensions are in inches 2) The tolerance for X.XXX = ±0.005 Pin Designation Pin # Designation 1 + Input 2 NC Standard or Sync. ( Optional ) 3 + Output 4 Output Return 5 - Output 6 NC 7 Case Ground 8 Enable 9 NC 10 Input Return Standard Microcircuit Drawing Equivalence Table Standard Microcircuit Drawing Number 5962-92109 5962-91613 www.irf.com Vendor Cage Code 52467 52467 IR Standard Part Number ATW2812D ATW2815D 7 ATW28XXD Series Device Screening Requirement MIL-STD-883 Method Temperature Range Element Evaluation Non-Destructive Bond Pull Internal Visual No Suffix ES d HB -20°C to +85°C -55°C to +125°C e -55°C to +125°C CH -55°C to +125°C MIL-PRF-38534 N/A N/A N/A Class H 2023 N/A N/A N/A N/A 2017 c Yes Yes Yes Temperature Cycle 1010 N/A Cond B Cond C Cond C Constant Acceleration 2001, Y1 Axis N/A 500 Gs 3000 Gs 3000 Gs N/A N/A PIND 2020 N/A N/A Burn-In 1015 N/A 48 hrs@hi temp Final Electrical MIL-PRF-38534 25°C 25°C d 160 hrs@125°C 160 hrs@125°C -55°C, +25°C, -55°C, +25°C, ( Group A ) & Specification +125°C +125°C PDA MIL-PRF-38534 N/A N/A N/A 10% Seal, Fine and Gross 1014 Cond A Cond A, C Cond A, C Cond A, C Radiographic 2012 N/A N/A N/A N/A External Visual 2009 Yes Yes Yes c Notes: Best commercial practice Sample tests at low and high temperatures -55°C to +105°C for AHE, ATO, ATW Part Numbering ATW 28 15 D /CH - MSTR Model Input Voltage Nominal 28 = 28V Output Voltage 12 = ±12V 15 = ±15V Sync Option MSTR = Master SLV = Slave Omit for Standard Screening Level (Please refer to Screening Table) No Suffix, ES, HB, CH Output D = Dual 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. 12/2006 8 www.irf.com