DataSheet.jp

ARM28XXT の電気的特性と機能

ARM28XXTのメーカーはIRFです、この部品の機能は「HYBRID - HIGH RELIABILITY 1 MEGA-RAD HARDENED DC/DC CONVERTER」です。


製品の詳細 ( Datasheet PDF )

部品番号 ARM28XXT
部品説明 HYBRID - HIGH RELIABILITY 1 MEGA-RAD HARDENED DC/DC CONVERTER
メーカ IRF
ロゴ IRF ロゴ 




このページの下部にプレビューとARM28XXTダウンロード(pdfファイル)リンクがあります。
Total 13 pages

No Preview Available !

ARM28XXT Datasheet, ARM28XXT PDF,ピン配置, 機能
PD - 94530B
HYBRID - HIGH RELIABILITY
1 MEGA-RAD HARDENED
DC/DC CONVERTER
ARM28XXT SERIES
28V Input, Triple Output
Description
The ARM Series of three output DC/DC converters are
designed specifically for use in the high-dose radiation
environments encountered during deep space planetary
missions. The extremely high level of radiation tolerance
inherent in the ARM design is assured as a result of
extensive research, thorough analysis and testing,
careful selection of components and lot verification
testing of finished hybrids. Many of the best circuit
design features characterizing earlier International
Rectifier products have been incorporated into the ARM
topology. Capable of uniformly high performance
through long term exposures in radiation intense
environments, this series sets the standard for distributed
power systems demanding high performance and
reliability.
The ARM 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 lead orientation
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 DSCC
qualified processes. For available screening options
refer to device screening table in the data sheet.
ARM
Features
n Total Dose > 1MRad (Si)
n SEE Hardened to LET up to 83 Mev.cm2/mg
n Derated per MIL-STD-975 & MIL-STD-1547
n Output Power Range 3 to 30 Watts
n 19 to 50 Volt Input Range
n Input Undervoltage Lockout
n High Electrical Efficiency > 80%
n Full Performance from -55°C to +125°C
n Continuous Short Circuit 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 5V, ±15V Outputs Available
Variations in electrical, mechanical and screening
specifications may be accommodated. Contact IR Santa
Clara for special requirements.
www.irf.com
1
08/11/06
http://www.Datasheet4U.com

1 Page





ARM28XXT pdf, ピン配列
ARM28XXT Series
Electrical Performance (Continued)
Parameter
Enable Input
open circuit voltage
drive current (sink)
voltage range
Synchronization Input
frequency range
pulse high level
pulse low level
pulse rise time
pulse duty cycle
Power dissipation, load fault
Output response to step load
changes Notes 7, 11
Recovery time from step load
changes Notes 11, 12
Output response to step line
changes Notes 10, 11
Recovery time from step line
changes Notes 10, 11,13
Turn on overshoot
Turn on delay Note 14
Capacitive load Notes 9, 10
Isolation
Symbol
Conditions
19 Vdc< VIN < 50Vdc
External clock signal on Sync. input (pin 4)
PD Short circuit, any output
10% Load to/from 50% load
VTLD
50% Load to/from 100% load
10% Load to/from 50% load
TTLD
50% Load to/from 100% load
VTLN
IOUT = 3000 mAdc
VIN = 19 V to/from 50 V
IOUT = ±500 mAdc
(main)
(dual)
IOUT = 3000 mAdc
TTLN VIN = 19 V to/from 50 V
IOUT = ±500 mAdc
(main)
(dual)
VOS IOUT = minimum and full rated
(main)
(dual)
TDLY IOUT = minimum and full rated
CL No effect on DC performance
(main)
(dual)
ISO 500VDC Input to Output or any pin to case
(except pin 12)
Min
3.0
0.1
-0.5
225
4.5
-0.5
40
20
-200
-200
-350
-1050
5.0
100
Max Units
5.0 V
mA
50.0 V
310
10.0
0.25
80
7.5
200
200
200
200
350
1050
500
500
500
1500
20
500
100
KHz
V
V
V/µs
%
W
mVPK
µs
mVPK
µs
mV
ms
µF
M
Notes to Specifications Table
1. Operation outside absolute maximum/minimum limits may cause permanent damage to the device. Extended operation at the limits may permanently
degrade performance and affect reliability.
2. Device performance specified in Electrical Performance table is guaranteed when operated within recommended limits. Operation outside
recommended limits is not specified.
3. Parameter measured from 28V to 19 V or to 50V while loads remain fixed.
4. Parameter measured from nominal to minimum or maximum load conditions while line remains fixed.
5. Up to 750 mA is available from the dual outputs provided the total output power does not exceed 30W.
6. Guaranteed for a bandwidth of DC to 20MHz. Tested using a 20KHz to 2MHz bandwidth.
7. Load current is stepped for output under test while other outputs are fixed at half rated load.
8. Load current is fixed for output under test while other output loads are varied for any combination of minimum to maximum.
9. A capacitive load of any value from 0 to the specified maximum is permitted without comprise to DC performance. A capacitive load in excess of the
maximum limit may interfere with the proper operation of the converter’s short circuit protection, causing erratic behavior during turn on.
10. Parameter is tested as part of design characterization or after design or process changes. Thereafter, parameters shall be guaranteed to the limits
specified in the table.
11. Load transient rate of change, di/dt 2AA/µ/µsS. ec.
12. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1% of its steady state value.
13. Line transient rate of change, dv/dt 50VV/µ/µsS. ec.
14. Turn on delay time is for either a step application of input power or a logical low to high transition on the enable pin (pin 3) while power is present at the
input.
www.irf.com
3
http://www.Datasheet4U.com


3Pages


ARM28XXT 電子部品, 半導体
ARM28XXT Series
1
+Input
EMI
Filter
Under-Voltage
Detector
Figure I. Block Diagram
3
Enable
Primary Bias
& Reference
Short
Circuit
4
Sync In
Pulse Width
Modulator
Sample
Hold
11 +15 Vout
Dual
Output
10
Return
9 -15 Vout
Dual
13 +5 Vdc
Output
14 Output
Return
Input
Return
2
Circuit Description and Application Information Operating Guidelines
The ARM28XXT 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 an 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.
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.
The circuit topology used for regulating output voltages in
the ARM28XXT 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 that the
user maintain the minimum load specified in the electrical
tables on each output. Attempts to operate 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 loads that are less than specification
minimums will result in regulation performance outside 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
the results. Characteristic curves illustrating typical
regulation performance are shown in Figures VII, VIII and IX.
Thermal Considerations
The ARM 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
Other key circuit design features include short circuit
protection, undervoltage lockout and an external
synchronization port permitting operation at an externally
set clock rate.
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.
6 www.irf.com
http://www.Datasheet4U.com

6 Page



ページ 合計 : 13 ページ
 
PDF
ダウンロード
[ ARM28XXT データシート.PDF ]


データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。


共有リンク

Link :


部品番号部品説明メーカ
ARM28XXT

HYBRID - HIGH RELIABILITY 1 MEGA-RAD HARDENED DC/DC CONVERTER

IRF
IRF


www.DataSheet.jp    |   2020   |  メール    |   最新    |   Sitemap