PD-95887A
ARH28XXS SERIES
HYBRID - HIGH RELIABILITY
RADIATION HARDENED
DC/DC CONVERTERS
Description
The ARH Series of DC/DC converters has been
designed specifically for use in the hostile environments
The high level of radiation tolerance inherent in the
ARH design is the result of extensive research, thorough
analysis and testing and of careful component
specification. Designed to supplement the triple output
configuration provided by the ART series, the ARH
circuit topology is the follow-on to the successful ART
design and incorporates many of the design features
characterizing that product line. Capable of uniform
high performance over long term exposures in radiation
intense environments, this series expands the standard
for distributed power systems demanding high
performance and reliability in the harsh environments.
The ARH converters are hermetically sealed in a
rugged, low profile package utilizing copper core input
and output pins to minimize resistive DC losses. Long-
term hermeticity is assured through use of parallel seam
welded lid attachment along with rugged ceramic pin-
to-package seal. Axial orientation of the leads facilitates
preferred bulkhead mounting placing the converter on
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.
Variations in electrical, mechanical and screening
specifications can be accommodated. Contact IR Santa
Clara for special requirements.
28V Input, Single Output
ARH
Features
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Total Dose > 100 krad (Si), 2:1 Margin
SEE Hardened to LET up to 83 MeV
.
cm
2
/mg
Derated per MIL-STD-975 & MIL-STD-1547
Output Power to 30 Watts
Regulates to No-Load
18 to 50 Volt Input Range
Input Undervoltage Lockout
Fully Characterized from -55°C to +125°C
Continuous Short Circuit Protection
12.8 W/in
3
Output Power Density
True Hermetic Package
External Inhibit Port
Externally Synchronizable
Fault Tolerant Design
Available with Outputs from 2.5V to 15V
Overload Protection
Standard Microcircuit Drawings Available
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1
08/11/06
ARH28XXS Series
Specifications
Absolute Maximum Ratings
Input Voltage range
Soldering temperature
Storage case temperature
-0.5V to +80VDC
300°C for 10 seconds
-65°C to +135°C
Recommended Operating Conditions
Input Voltage range
Output Power
Operating case temperature
+18V to +60VDC
+18V to +50V for full derating to MIL-STD-1547
0 to 30W
-55°C to +125°C
-55°C to +85°C for full derating to MIL-STD-975
Electrical Performance
Parameter
Output voltage accuracy
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
Output power
-55°C < T
CASE
< +125°C, V
IN
= 28V±5%, C
L
= 0 unless otherwise specified.
Symbol
V
OUT
Test Conditions
P
OUT
= 30 W, T
C
= +25°C
Limit
MIN
2.487
3.283
4.975
5.174
11.940
14.925
Limit
MAX
2.513
3.317
5.025
5.226
12.060
15.075
30
Units
Vdc
P
OUT
18 Vdc < V
IN
< 50Vdc
0
W
Output current
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
Line regulation Note 3
Load regulation Note 4
Total regulation
I
OUT
18 Vdc < V
IN
< 50Vdc
0
0
0
0
0
0
12000
9090
6000
5770
2500
2000
+1.0
+2.0
+4.0
100
mA
inhibited (Pin 3 shorted to pin 2)
—
8.0
18 Vdc < V
IN
< 50Vdc, I
OUT
= I
MAX
30
30
40
40
50
50
mAdc
VR
LINE
VR
LOAD
VR
18 Vdc < V
IN
< 50Vdc, 0 < I
OUT
< I
MAX
18 Vdc < V
IN
< 50Vdc, 0 < I
OUT
< I
MAX
All conditions of Line, Load, Temperature,
Radiation and End of Life
I
OUT
= 0 (Pin 3 open)
-1.0
-2.0
-4.0
—
%
%
%
No-load input current
Output ripple and noise voltage
Note 5
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
I
IN
V
RIP
mV
p.p
For Notes to Specifications, refer to page 4
2
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ARH28XXS Series
Electrical Performance
Parameter
Input ripple current Note 5
Switching frequency
Efficiency
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
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
Synchronization Output
pulse high level
Power dissipation, Short circuit
ARH2802R5S
ARH2803R3S & ARH2805S
All Others
Output response to step load
changes
Note 8
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
Recovery time from step load
changes
Notes 8, 9
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
Output response to step line
changes
Notes 7, 10
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
P
D
External clock signal on Sync. input (pin 4)
225
3.5
-0.5
40
20
Signal compatible with Synchronization Input
3.7
Short circuit on output
10
12
9.5
V
TLD
50% Load
⇔
100% load
-200
-200
-200
-200
-300
-350
T
TLD
50% Load
⇔
100% load
200
200
200
200
200
200
V
TLN
I
OUT
= I
MAX
, V
IN
= 18 V to/from 50 V
-180
-180
-250
-250
-450
-900
180
180
250
250
450
900
200
200
200
200
300
350
W
4.3
V
310
10
0.25
80
KHz
V
V
V/µs
%
-55°C < T
CASE
< +125°C, V
IN
= 28V±5%, C
L
= 0 unless otherwise specified. (Continued)
Symbol
I
RIP
F
S
Eff
Test Conditions
18 Vdc < V
IN
< 50Vdc, I
OUT
= I
MAX
Synchronization input open. (pin 6)
I
OUT
= I
MAX
, T
C
= +25°C
Limit
MIN
Limit
MAX
100
Units
mA
p.p
KHz
225
72
75
76
76
80
80
3.0
-0.5
275
%
5.0
100
50
V
µA
V
mV
PK
µs
mV
PK
For Notes to Specifications, refer to page 4
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3
ARH28XXS Series
Electrical Performance
Parameter
Recovery time from step line
changes
Notes 7, 9, 10
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
Turn on overshoot
Turn on delay Note 11
Capacitive load Notes 6, 7
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
Isolation
Recovery from a short circuit
-55°C < T
CASE
< +125°C, V
IN
= 28V±5%, C
L
= 0 unless otherwise specified. (Continued)
Symbol
T
TLN
Test Conditions
I
OUT
= I
MAX
, V
IN
= 18 V to/from 50 V
Limit
MIN
Limit
MAX
Units
600
600
700
700
320
400
V
OS
T
DLY
CL
I
OUT
= 10% or 100% of I
MAX
I
OUT
= 10% or 100% of I
MAX
No effect on DC performance
1200
1200
1000
1000
180
120
ISO
Vr
500VDC Input to Output or any pin to case
Output shorted, then open into max rated load
current. Vin = 28 V
100
10
2.0
5.0
20
µs
%V
out
ms
µF
MΩ
% of
Rated
Output
Voltage
% of
Max
Output
Current
Overload Trip Current
Ovld
Maximum current at specified output voltage
105
135
Notes to Specifications Tables
1.
2.
3.
4.
5.
6.
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.
Device performance specified in Electrical Performance table is guaranteed when operated within recommended limits. Operation
outside recommended limits is not specified.
Parameter measured from 28 V to 18 V or to 50 V while load remains fixed at 10%, 50% and 100% of Imax.
Parameter measured from 50% to 10% or 100% of maximum load conditions while line remains fixed at 18, 28 or 50 volts.
Guaranteed for a bandwidth of DC to 20 Mhz. Tested using a 20 Khz to 2.0 Mhz bandwidth.
A capacitive load of any value from 0 to the specified maximum is permitted without compromise 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.
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.
Load transient rate of change, di/dt
≤
2.0 A/µs.
Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±1% of its steady state value.
7.
8.
9.
10. Line transient rate of change, dv/dt
≤
50 V/µs.
11. 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.
4
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ARH28XXS Series
Group A Tests
Test
Output voltage accuracy
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
Output power Note 1
Output current
Note 1
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
Output regulation Note 4
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
I
OUT
= 0, Pin 3 open
No Load Input Current
Output ripple Note 2
ARH2802R5S
ARH2803R3S
ARH2805S
ARH2805R2S
ARH2812S
ARH2815S
Switching frequency
Input ripple Note 2
Recovery from a short
circuit
Overload Trip Current
I
IN
Pin 3 shorted to pin 2 (disabled)
V
RIP
V
IN
= 18 V, 28V, 50 V
I
OUT
= I
MAX
1, 2, 3
8.0
VR
I
OUT
= 10%, 50%, 100% of I
MAX
V
IN
= 18 V, 28V, 50 V
P
OUT
I
OUT
V
IN
= 18 V, 28V, 50 V
V
IN
= 18 V, 28V, 50 V
1, 2, 3
1, 2, 3
0
0
0
0
0
0
12000
9090
6000
5770
2500
2000
V
IN
= 28V, C
L
= 0 unless otherwise specified.
Symbol
V
OUT
Test Conditions
I
OUT
= I
MAX
, Tc = 25°C
Group A
Subgroups
1
Limit
MIN
Limit
MAX
Units
2.487
3.283
4.975
5.174
11.940
14.925
0
2.513
3.317
5.025
5.226
12.060
15.075
30
V
W
mA
1, 2, 3
2.425
3.201
4.850
5.044
11.640
14.550
2.575
3.399
5.150
5.356
12.360
15.450
100
V
1, 2, 3
mA
1, 2, 3
30
30
40
40
50
50
225
275
100
5.0
mV
P-P
F
S
I
RIP
Vr
Synchronization pin (pin 6) open
V
IN
= 18 V, 28V, 50 V
I
OUT
= I
MAX
Output shorted, then open into max rated
load current. Vin = 28 V
Maximum current at specified output
voltage
4, 5, 6
1, 2, 3
KHz
mA
P-P
% of Rated
Output
Voltage
% of Max
Output
Current
Ovld
1, 2, 3
105
135
For Notes to Group A Tests, refer to page 6
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