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PDF ATW28xxD Data sheet ( Hoja de datos )
| Número de pieza | ATW28xxD | |
| Descripción | ADVANCED ANALOG HYBRID-HIGH RELIABILITY DC/DC CONVERTERS | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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PD - 94557
ADVANCED ANALOG
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS
ATW28XXD SERIES
28V Input, Dual Output
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 op-
erate 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 modu-
lated 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 trans-
formers in the forward and feedback circuits.
The advanced feedback design provides fast loop re-
sponse for superior line and load transient character-
istics and offers greater reliability and radiation toler-
ance 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-PRF-
38534, these converters are available in four screen-
ing 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 re-
quirements, e.g., element evaluation and Periodic In-
spection (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 applica-
tions. Variations in electrical, mechanical and screen-
ing can be accommodated. Contact Advanced Analog
for special requirements.
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
n 22.8 W/in3 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
www.irf.com
1
10/24/02
1 page  
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ATW28XXD Series
Table II. Electrical Performance Characteristics - continued
Test
Symbol
Conditions
-55°C ≤Tc ≤+125°C
Vin = 28 Vdc ±5%, CL = 0
unless otherwise specified
Group A
Subgroups
Device
Types
Output response
transient step line
changes 5, 12
Recovery time
transient step line
changes 1. 5, 12
Turn on overshoot
Turn on delay 2
Load fault recovery 12
Weight
VOTLINE
TTLINE
VTonOS
Ton
D
TrLF
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
I = 0 and 2000mA
OUT
VIN = 18 to 40 VDC
Flange
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
All
All
All
All
All
All
All
Limits
ATW2815D
Unit
Min Max
+180 mV pk
-600
400
mV pk
µs
400 µs
750 mV pk
12 ms
12 ms
75 grams
Notes to Specifications
1 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1% of VOUT at 50% load.
2 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 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.
4 Above +125°C case, derate output power linearly to 0 at +135°C case.
5 Input step transition time between 2 and 10 microseconds.
6 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.
7 Load step transition time between 2 and 10 microseconds.
8 Bandwidth guaranteed by design. Tested for 20KHz to 2MHz.
9 Load current split equally between +VOUT and –VOUT.
10 When operating with unbalanced loads, at least 25% of the load must be on the positive output to maintain regulation.
11 Parameter guaranteed by line and load regulation tests.
12 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.
13 Up to 90% of full power is available from either output provided the total output does not exceed 30 watts.
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