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ARM28XXT PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 ARM28XXT
기능 HYBRID - HIGH RELIABILITY 1 MEGA-RAD HARDENED DC/DC CONVERTER
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ARM28XXT 데이터시트, 핀배열, 회로
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.
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1
08/11/06
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ARM28XXT pdf, 반도체, 판매, 대치품
ARM28XXT Series
Group A Tests VIN= 28Volts, CL =0 unless otherwise specified.
Test
Symbol Conditions unless otherwise specified
Output voltage accuracy
VOUT
IOUT = 1.5 Adc
IOUT = ±250mAdc
IOUT = ±250mAdc
(main)
ARM2812(dual)
ARM2815(dual)
Output power Note 1
POUT VIN = 19 V, 28V, 50 V
Output current
Note 1
IOUT VIN 19 V, 28V, 50 V
(main)
(dual)
IOUT = 150, 1500, 3000mAdc
(main)
Output regulation Note 4 VR VIN = 19 V, 28V, 50 V
IOUT = ±75, ±310, ±625mAdc 2812(dual)
IOUT = ±75, ±250, ±500mAdc 2815(dual)
Input current
IOUT = minimum rated, Pin 3 open
IIN
Pin 3 shorted to pin 2 (disabled)
Output ripple Note 2
VRIP VIN = 19 V, 28V, 50 V
IOUT = 3000mA main, ±500mA dual
Input ripple Note 2
IRIP VIN = 19 V, 28V, 50 V
IOUT = 3000mA main, ±500mA dual
Switching frequency
FS Synchronization pin (pin 6) open
Efficiency
Eff IOUT = 800mA main, ±500mA dual
Power dissipation,
load fault
Output response to step
load changes Notes 3, 5
Recovery time from step
load changes Notes 5, 6
Turn on overshoot
Turn on delay Note 7
Isolation
PD Short circuit, any output
10% Load to/from 50% load
VTL
50% Load to/from 100% load
10% Load to/from 50% load
TTL
50% Load to/from 100% load
VOS IOUT = minimum and full rated
(main)
(dual)
TDLY IOUT = minimum and full rated
ISO 500VDC Input to output or any pin to case
(except pin 12)
Group A
Subgroups
1, 2, 3
Min
4.95
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
±11.70
±14.50
3.0
150
1, 2, 3
1, 2, 3
75
4.8
1, 2, 3
1, 2, 3
1, 2, 3
±11.1
±14.0
1, 2, 3
1, 2, 3
1, 2, 3
4, 5, 6
1
2, 3
1, 2, 3
225
80
78
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
1
-200
-200
5.0
100
Max
5.05
±12.30
±15.15
30
3000
500
5.2
±12.9
±15.8
250
8.0
100
Units
V
W
mA
V
mA
mVP-P
150 mAP-P
275 KHz
%
7.5 W
200
200
200
200
500
1500
20
mVPK
µs
mV
ms
M
Notes to Group A Test Table
1. Parameter verified during dynamic load regulation tests
2. Guaranteed for DC to 20 MHz bandwidth. Test conducted using a 20KHz to 2MHz bandwidth.
3. Load current is stepped for output under test while other outputs are fixed at half rated load.
4. Each output is measured for all combinations of line and load. Only the minimum and maximum readings for each output are recorded.
5. Load step transition time 10µS.
6. Recovery time is measured from the initiation of the transient to where V has returned to within ±1% of its steady state value.
OUT
7. Turn on delay time is tested by application of a logical low to high transition on the enable pin (pin 3) with power present at the input.
8. Subgroups 1 and 4 are performed at +25°C, subgroups 2 and 5 at -55°C and subgroups 3 and 6 at +125°C.
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ARM28XXT 전자부품, 판매, 대치품
ARM28XXT Series
Effectiveness of this heat transfer is dependent on the
intimacy of the baseplate-heatsink interface. It is therefore
suggested that a heat transferring medium possessing
good thermal conductivity is inserted between the
baseplate and heatsink. A material utilized at the factory
during testing and burn-in processes is sold under the
trade name of Sil-Pad®4001. This particular product is an
insulator but electrically conductive versions are also
available. Use of these materials assures optimum surface
contact with the heat dissipater by compensating for minor
surface variations. While other available types of heat
conducting materials and thermal compounds provide
similar effectiveness, these alternatives are often less
convenient and are frequently messy to use.
A conservative aid to estimating the total heat sink surface
area (AHEAT SINK) required to set the maximum case
temperature rise (T) above ambient temperature is given
by the following expression:
Thus, a total heat sink surface area (including fins, if any)
of approximately 32 in2 in this example, would limit case
rise to 35°C above ambient. A flat aluminum plate, 0.25"
thick and of approximate dimension 4" by 4" (16 in2 per
side) would suffice for this application in a still air
environment. Note that to meet the criteria, both sides of
the plate require unrestricted exposure to the ambient air.
Inhibiting Converter Output
As an alternative to application and removal of the DC
voltage to the input, the user can control the converter
output by providing an input referenced, TTL compatible,
logic signal to the enable pin 3. This port is internally pulled
“high” so that when not used, an open connection on the
pin permits normal converter operation. When inhibited
outputs are desired, a logical “low” on this port will shut the
converter down. An open collector device capable of
sinking at least 100 µA connected to enable pin 3 will work
well in this application.
A
HEAT SINK
⎧ ∆T 1.43
80
P
0.85
5.94
A benefit of utilization of the enable input is that following
initial charge of the input capacitor, subsequent turn-on
commands will induce no uncontrolled current inrush.
where
T = Case temperature rise above ambient
P=
Device
dissipation
in
Watts
=
P OUT
1
Eff
1
As an example, assume that it is desired to maintain the
case temperature of an ARM2815T at +65°C or less while
operating in an open area whose ambient temperature
does not exceed +35°C; then
T = 65 - 35 = 35°C
From the Specification Table, the worst case full load
efficiency for this device is 80%; therefore the maximum
power dissipation at full load is given by
P = 30 • ⎧⎨⎩.810 1⎫⎬⎭ = 30 (0.25) = 7.5W
and the required heat sink area is
A
HEAT SINK
=
⎧⎨⎩
80
35
7.50.85
⎫⎬ 1.43
5.94
=
31.8
in 2
Figure II. Enable Input Equivalent Circuit
Vin
5K
Enable
Input
Input
Return
64K
186K
150K
2N2907A
5.6 V
150K
150K
2N2222A
2N2222A
Converter inhibit is initiated when
this transistor is turned off
1Sil-Pad is a registered Trade Mark of Bergquist, Minneapolis, MN
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ARM28XXT

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

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