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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.
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 -55C to +125C 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 85C Standard Microcircuit Drawings Available
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1
12/14/06
ATW28XXD Series Specifications
Absolute Maximum Ratings
Input voltage Soldering temperature Operating case temperature Storage case temperature -0.5V to +50VDC 300C for 10 seconds -55C to +125C -65C to +135C
ATW2812D
Table I. Electrical Performance Characteristics
Test Symbol Conditions -55C Tc +125C Vin = 28 Vdc 5%, CL = 0 Unless otherwise specified IOUT = 0 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 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 = +25C Input to output or any pin to case (except pin 7) at 500 V dc Tc = +25C No effect on dc performance, Tc = +25C, total for both outputs 8 Overload, TC = +25C Short circuit, TC = +25C IOUT = 2500mA Group A Subgroups Device Types Limits Unit
Output voltage Output current
1, 2 3
VOUT IOUT VRIP VRLINE VRLOAD VRCROSS IIN
1 2,3 1,2,3 1,2,3 1 2,3 1,2,3 1,2,3 1,2,3
All All All All All All All
Min 11.88 11.76 250
Max 12.12 12.24 2250 85 30 60 120 3.5 18 50
V mA mVp-p mV mV % mA
Output ripple voltage Line regulation
4
Load regulation
4 5
Cross regulation Input current
Input ripple current Efficiency Isolation Capacitive load
6, 7 4
3, 4
IRIP EFF ISO CL PD
1,2,3 1 1 4 1 4,5,6
All All All All All 01 02 03 All 250 250 275 -400 80 100
50
mAp-p % M
200 12 9.0 300 270 300 +400
F W KHz
Power dissipation load fault Switching frequency
4
FS
Output response to step transient load 4, 9 changes Recovery time step transient load 4, 9, 10 changes
VOTLOAD
1250mA to/from 2500mA
4,5,6
mV pk
TTLOAD
0mA to/from 2500mA 1250mA to/from 2500mA
4,5,6 4,5,6
All All
-800
+800 70
s
0mA to/from 1250mA 1250mA to/from 0mA
4,5,6 4,5,6
All All
500 5.0
ms
For Notes to Specifications, refer to page 3
2
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ATW28XXD Series
Table I. Electrical Performance Characteristics - continued
Test Symbol Conditions -55C Tc +125C Vin = 28 Vdc 5%, CL = 0 unless otherwise specified Input step from/to 18 to 40 Vdc, IOUT = 2500mA Input step from/to 18 to 40 Vdc, IOUT = 2500mA IOUT = 0 and 2500mA IOUT = 0 and 2500mA Group A Subgroups Device Types Limits
ATW2812D
Unit
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
VOTLINE TTLINE VTonOS TonD TrLF
4,5,6
All
Min -800
Max +800
mV pk
4,5,6
All
4000
s mV pk ms ms g
4,5,6 4,5,6 4,5,6
All All All
750 14 14 75
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 -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 2.0s and 10s. 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 2.0s and 10s. 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.
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3
ATW28XXD Series
Specifications
Absolute Maximum Ratings
Input voltage Soldering temperature Operating case temperature Storage case temperature -0.5V to +50VDC 300C for 10 seconds -55C to +125C -65C to +135C
ATW2815D
Table II. Electrical Performance Characteristics
Test Symbol Conditions -55C Tc +125C 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 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 = 25C Input to output or any pin to case (except pin 8) at 500V dc Tc = 25C No effect on dc performance, Tc = 25C 3 Overload, TC = +25C Short circuit, TC = +25C IOUT = 2000mA 50% load to/from 100% load Group A Subgroups Device Types Limits Unit
Output voltage Output current Output ripple voltage Output Power Line regulation
4, 11 9, 10 11, 13
VOUT
8
IOUT VRIP POUT VRLINE VRLOAD IIN IRIP EFF ISO CL PD FS VOTLOAD
1 2,3 1,2,3 1,2,3 1,2,3 1 2,3 1,2,3 1,2,3 1,2,3 1,2,3 1 1 4 1 1 1,2,3 1,2,3 1,2,3 4,5,6
All All All All All All All All All All All All All All All All 01 02 03 All
Min 14.85 14.70 0.200
Max 15.15 15.30 2000 85
VDC VDC mADC mVp-p W mV mV mV mADC mADC mAp-p % M F W W KHz KHz KHz mV pk
30 35 75 150 12 30 60 80 100 500 9.0 9.0 263 245 265 +300
Load regulation Input current
9, 10
Input ripple current Efficiency Isolation Capacitive load
6, 12
Power dissipation load fault Switching frequency
Output response to step transient 7, 9, 10 load changes
237 230 250 -300
Recovery time step 1, 7 transient load changes
TTLOAD
No load to 100% load 100% load to no load 50% load to/from 100% load No load to 50% load 50% load to no load
4,5,6 4,5,6 4,5,6 4,5,6 4,5,6
All All All All All
-800 +800
-800 +800 25 500 7.0
mV pk mV pk s s ms
For Notes to Specifications, refer to page 5
4
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ATW28XXD Series
Table II. Electrical Performance Characteristics - continued
Test Symbol Conditions -55C Tc +125C Vin = 28 Vdc 5%, CL = 0 unless otherwise specified Input step from/to 18 to 40VDC Input step from 40 to18 VDC Input step from/to 18 to 40 VDC Input step from 40 to 18 VDC IOUT = 0 and 2000mA IOUT = 0 and 2000mA VIN = 18 to 40 VDC Flange Group A Subgroups Device Types Min Output response transient step line 5, 12 changes Recovery time transient step line 1. 5, 12 changes Turn on overshoot 2 Turn on delay Load fault recovery Weight
12
ATW2815D
Limits Unit
Max +180 mV pk
VOTLINE
4,5,6
All
TTLINE
4,5,6 4,5,6
All All
-600 400
mV pk s s mV pk ms ms g
VTonOS TonD TrLF
4,5,6 4,5,6 4,5,6 4,5,6
All All All All
400 750 12 12 75
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 +125C case, derate output power linearly to 0 at +135C case. Input step transition time between 2.0s and 10s. 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 2.0s and 10s. 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.
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ATW28XXD Series
Block Diagram
3 +Vout +Input 1 Enable 8 Sync 2 Input Return 10 EMI Filter
Drive 1 Drive 2
4
Output Return
5 -Vout
Pulse Width Modulator FB
Error Amp & Reference
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 400A of current. The open circuit voltage of the inhibit input is 11.5 1.0VDC. 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.
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 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
Output
ATW28xxS
Return MSTR
Return
Return
System Bus
+ In
ATW28XXD Output or Other Return Return Compatable Output
Case SLV
+ In Case Return SLV
Output
ATW28XXD
Return Output
6
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ATW28XXD Series
Mechanical Outline
1.000 0.040 D X 0.26 L Pins 0.05
10
1 2
9
4 X 0.400 =1.600
1.95
2.360
2.700 Max
3
7
8
4
6
5
0.500 Max 1.350 Max
Notes: 1) All dimensions are in inches 2) The tolerance for X.XXX = 0.005
Pin Designation
Pin # 1 2 3 4 5 6 7 8 9 10 Designation + Input NC Standard or Sync. ( Optional ) + Output Output Return - Output NC Case Ground Enable NC Input Return
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit Drawing Number
5962-92109 5962-91613
Vendor Cage Code 52467 52467
IR Standard Part Number
ATW2812D ATW2815D
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7
ATW28XXD Series
Device Screening
Requirement
Temperature Range Element Evaluation Non-Destructive Bond Pull Internal Visual Temperature Cycle Constant Acceleration PIND Burn-In Final Electrical ( Group A ) PDA Seal, Fine and Gross Radiographic External Visual MIL-PRF-38534 2023 2017 1010 2001, Y1 Axis 2020 1015 MIL-PRF-38534 & Specification MIL-PRF-38534 1014 2012 2009 N/A Cond A N/A N/A Cond A, C N/A Yes
MIL-STD-883 Method
No Suffix
N/A N/A
ES
d
HB
CH
-55C to +125C Class H N/A Yes Cond C 3000 Gs N/A -55C, +25C, +125C 10% Cond A, C N/A Yes
-20C to +85C -55C to +125C N/A N/A Yes Cond B 500 Gs N/A
e -55C to +125C
N/A N/A Yes Cond C 3000 Gs N/A -55C, +25C, +125C N/A Cond A, C N/A Yes
c
N/A N/A N/A N/A 25C
48 hrs@hi temp 25C
d
160 hrs@125C 160 hrs@125C
c
Notes:
Best commercial practice Sample tests at low and high temperatures -55C to +105C for AHE, ATO, ATW
Part Numbering
ATW 28 15 D /CH - MSTR Model Input Voltage Nominal
28 = 28V
Sync Option
MSTR = Master SLV = Slave Omit for Standard
Output Voltage
12 = 12V 15 = 15V
(Please refer to Screening Table)
Screening Level Output
D = Dual
No Suffix, ES, HB, 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. 12/2006
8
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