IRF ATW28XXD Hybrid-high reliability dc/dc converter Datasheet

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.
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ATW
Features
n
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n
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n
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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
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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.
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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
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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.
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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
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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
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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
ƒ -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
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