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ART28XXT Schematic ( PDF Datasheet ) - IRF

Teilenummer ART28XXT
Beschreibung HYBRID - HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER
Hersteller IRF
Logo IRF Logo 




Gesamt 12 Seiten
ART28XXT Datasheet, Funktion
PD-94529G
HYBRID - HIGH RELIABILITY
RADIATION HARDENED
DC-DC CONVERTER
ART28XXT SERIES
28V Input, Triple Output
Description
The ART Series of three output DC-DC converters are
designed specifically for use in the hostile radiation
environments characteristic of space and weapon
systems. The extremely high level of radiation tolerance
inherent in the ART design is the culmination of
extensive research, thorough analysis and testing and
of careful component selection. Many of the proven
circuit design features characterizing the International
Rectifier standard product line were adapted for
incorporation into the ART topology. Capable of
uniformly high performance over long term exposures
in radiation intense environments, this series sets the
standard for distributed power systems demanding high
performance and reliability.
The ART converters are hermetically sealed in a
rugged, low profile package utilizing copper core pins
to minimize resistive DC losses. Long-term hermeticity
is assured through use of parallel seam welded lid
attachment along with International Rectifier’s rugged
ceramic pin-to-package seal. Axial orientation of the
leads facilitates preferred bulkhead mounting to the
principal heat-dissipating surface.
Manufactured in a facility fully qualified to MIL-PRF-38534,
these converters are fabricated utilizing DLA qualified
processes. For available screening options, refer to
device screening table in the data sheet.
ART
Features
n Total Dose > 100 krad (Si), 2:1margin
n SEE Hardened to LET up to 83 Mev.cm2/mg
n Output Power Range 3 to 30 Watts
n 19 to 50 Volt Input Range
n Input Undervoltage Lockout
n High Electrical Efficiency > 83%
n Full Performance from -55°C to +125°C
n Continuous Short Circuit and Overload
Protection
n 12.8 W/in3 Output Power Density
n True Hermetic Package
n External Inhibit Port
n Externally Synchronizable
n Fault Tolerant Design
n 5V, ±12V or ±15 V Outputs Available
n Standard Microcircuit Drawings Available
Variations in electrical, mechanical and screening
specifications can be accommodated. Contact IR San
Jose for special requirements.
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1
08/15/12
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ART28XXT Datasheet, Funktion
ART28XXT SERIES
1
+Input
EMI
Filter
Figure I. Block Diagram
11 +12/+15 Vdc
Output
Under-Voltage
Detector
10 +12/+15 Vdc
Output Return
3
Enable
Primary Bias
& Reference
Short
Circuit
9
-12/-15 Vdc
Output
13 +5 Vdc
Output
4
Sync In
5
Sync Out
Pulse Width
Modulator
Sample
Hold
14 +5 Vdc
Output Return
Input
Return
2
Circuit Description and Application Information
Operating Guidelines
The ART28XXT series of converters have been designed
using a single ended forward switched mode converter
topology. (refer to Figure I.) Single ended topologies enjoy
some advantage in radiation hardened designs in that they
eliminate the possibility of simultaneous turn on of both
switching elements during a radiation induced upset; in
addition, single ended topologies are not subject to
transformer saturation problems often associated with
double ended implementations.
The design incorporates a two-stage LC input filter to
attenuate input ripple current. A low overhead linear bias
regulator is used to provide bias voltage for the converter
primary control logic and a stable, well regulated reference
for the error amplifier. Output control is realized using a
wide band discrete pulse width modulator control circuit
incorporating a unique non-linear ramp generator circuit.
This circuit helps stabilize loop gain over variations in line
voltage for superior output transient response. Nominal
conversion frequency has been selected as 250 KHz to
maximize efficiency and minimize magnetic element size.
The circuit topology used for regulating output voltages in
the ART28XXT series of converters was selected for a
number of reasons. Significant among these is the ability
to simultaneously provide adequate regulation to three
output voltages while maintaining modest circuit complexity.
These attributes were fundamental in retaining the high
reliability and insensitivity to radiation that characterizes
device performance. Use of this topology dictates
maintaining the minimum load specified in the electrical
tables on each output. Operating the converter without a
load on any output will result in peak charging to an output
voltage well above the specified voltage regulation limits,
potentially in excess of ratings, and should be avoided.
Output load currents less than specification minimums will
result in regulation performance that exceeds the limits
presented in the tables. In most practical applications, this
lower bound on the load range does not present a serious
constraint; however the user should be mindfull of device
performance when operated outside specified limits.
Thermal Considerations
Output voltages are sensed using a coupled inductor and
a patented magnetic feedback circuit. This circuit is
relatively insensitive to variations in temperature, aging,
radiation and manufacturing tolerances making it
particularly well suited to radiation hardened designs. The
control logic has been designed to use only radiation
tolerant components, and all current paths are limited with
series resistance to limit photo currents.
Other key circuit design features include short circuit
protection, undervoltage lockout and an external
synchronization port permitting operation at an externally
set clock rate.
6
The ART series of converters is capable of providing
relatively high output power from a package of modest
volume. The power density exhibited by these devices is
obtained by combining high circuit efficiency with effective
methods of heat removal from the die junctions. Good
design practices have effectively addressed this
requirement inside the device. However when operating
at maximum loads, significant heat generated at the die
junctions must be carried away by conduction from the
base. To maintain case temperature at or below the
specified maximum of 125°C, this heat can be transferred
by attachment to an appropriate heat dissipater held in
intimate contact with the converter base-plate.
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ART28XXT pdf, datenblatt
ART28XXT SERIES
Device Screening
Requirement
dMIL-STD-883 Method No Suffix
CK d
EM
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
-55°C to +85°C
Class K
Yes
Yes
Cond C
3000 Gs
Cond A
320 hrs @ 125°C
( 2 x 160 hrs )
-55°C, +25°C,
+85°C
2%
Cond A, C
Yes
Yes
-55°C to +85°C
Class K
Yes
Yes
Cond C
3000 Gs
Cond A
320 hrs @ 125°C
( 2 x 160 hrs )
-55°C, +25°C,
+85°C
2%
Cond A, C
Yes
Yes
-55°C to +85°C
N/A
N/A
c
Cond C
3000 Gs
N/A
48 hrs @ 125°C
-55°C, +25°C,
+85°C
N/A
Cond A
N/A
c
Notes:
c Best commercial practice.
d CK is a DLA class K compliant without radiation performance. No Suffix is a radiation rated device but
not available as a DLA quallified SMD per MIL-PRF-38534.
International Rectifier currently does not have a DLA certified Radiation Hardness Assurance Program.
Part Numbering
ART 28 15 T / XX X
Model
Input Voltage
28 = 28V
Output Voltage
12 = 5V, ± 12V
15 = 5V, ± 15V
Output
T = Triple
Lead Finish for CK only
C = Gold Plated
A = Solder Dipped
Blank for No Suffix and EM
Lead Finish for No Suffix = Solder Dipped
Lead Finish for EM is Gold Plated or
Solder Dipped depending on availability
Screening Level
(Please refer to Screening Table)
No Suffix, CK, EM
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR SAN JOSE: 2520 Junction Avenue, San Jose, California 95134, Tel: (408) 434-5000
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 08/2012
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