PD-94540A
ASA28XXD SERIES
28V Input, Dual Output
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
Description
The ASA28XXD Series of DC/DC converters are high
reliability thick film hybrid converters that use flyback
topology operating at a nominal frequency of 550KHz.
High input to output isolation is achieved through the
use of transformers in the flyback power and feed back
circuits.
The advanced feedback design provides fast loop
response for superior line and load transient
characteristics and offers greater reliability than devices
incorporating optical feedback circuits.
This device is designed to meet MIL-STD-704 input
requirements offering full performance over a 16V to
40V input range. Output Power of up to 5W is available
for either balanced or unbalanced loads.
Connecting the inhibit pin (pin 5) to the input common
(pin 7) will cause the converter to shut down. It is
recommended that the inhibit pin be driven by an open
collector device capable of sinking at least 400µA. The
open circuit voltage of the inhibit pin is 11.5 ± 0.5V.
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 can
be accommodated. Extensive computer simulation
using complex modeling enables rapid design
modification to be provided. Contact IR Santa Clara
with specific requirements.
ASA
Features
Up To 5.0W Output Power
±
5V,
±
12V,
±
15V Outputs
High Reliability
Wide Input Voltage Range -16V To 40V
Indefinite Short Circuit and Overload Protection
Popular Industry Standard Pin-Out
Military Screening
Parallel Seam Welded Package
No External Capacitors Required
Input Voltage Surge Protected to MIL-STD-704
Under Voltage Lockout
Standard Microcircuit Drawings Available
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01/11/07
1
ASA28XXD Series
Specifications
Absolute Maximum Ratings
Input voltage
Power output
Soldering temperature
Operating case temperature
Storage case temperature
Conditions
-55°
≤
T
C
≤+125°C
V
IN
= 28V dc ±5% C
L
= 0
unless otherwise specified
I
OUT
= 0
1, 2
-0.5V to +50VDC Continous, 80V, 100 msec
Internally limited ( 6.5W typical )
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
ASA2805D/XX
Group A
Subgroups
1
2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Min
±4.95
±4.90
200
Max
±5.05
±5.10
1000
470
50
ASA2812D/XX
Min
±11.88
±11.76
84
Max
±12.12
±12.24
333
200
50
ASA2815D/XX
Min
±14.85
±14.70
67
Max
±15.15
±15.30
267
290
50
mA
TEST
Output voltage
Output current
Unit
V
V
IN
= 16, 28, and 40 V dc
either output
3, 4
Output ripple voltage
Line regulation
4
V
IN
= 16, 28 and 40 V dc
V
IN
= 16, 28, and 40 V dc
I
OUT
= 0, 50%, 100% I
MAX
mV
PP
mV
Load regulation
4
V
IN
= 16, 28, and 40 V dc
I
OUT
= 0, 50%, 100% I
MAX
20% to 80% load change
I
OUT
= 0
Pin 5 connected to pin 7
I
OUT
= 0 Pin5 open
1, 2, 3
50
50
50
mV
Cross regulation
Input current
5
1, 2, 3
15
12
60
8.0
12
60
100
71
68
100
200
71
68
100
8.0
12
60
100
%
1, 2, 3
mA
Input ripple current
Efficiency
Isolation
4
3, 4
I
OUT
= I
MAX
I
OUT
= I
MAX
Input to output or any pin to
case (except pin 8) at 500 V
dc, Tc = +25° C
1, 2, 3
1, 3
2
1
4
1, 2, 3
4, 5, 6
100% I
MAX
50% I
MAX
100% I
MAX
50% I
MAX
4, 5, 6
4, 5, 6
500
-400
-800
70
66
100
200
100
mA
PP
%
MΩ
200
4.0
2.0
µF
W
KHz
Capacitive load
6, 7
No effect on dc performance,
total for both outputs
Overload
8
Power dissipation load fault
4
4.0
2.0
600
+400
+800
100
2000
500
-400
-800
4.0
2.0
600
+400
+800
100
2000
- 750
+750
-750
500
-400
-800
Short circuit
Switching frequency
I
OUT
= I
MAX
4, 9
600
+400
Output response to step
transient load changes
Recovery time, step
transient load changes
4, 9, 10
I
OUT
= 50%
I
OUT
= 0
I
OUT
= 50%
I
OUT
= 0
mV pk
+800
100
2000
+750
mV pk
µs
Output response transient
step line changes
4, 7, 11
V
IN
=16
40Vdc,I
OUT
= I
MAX
4, 5, 6
-750
+750
Recovery time transient step
line changes
4, 7, 10, 11
4
V
IN
=16
40Vdc, I
OUT
= I
MAX
4, 5, 6
1200
1200
1200
µs
Turn on overshoot
Turn on delay
I
OUT
= 0 and I
MAX
I
OUT
= 0 and I
MAX
4, 5, 6
4, 5, 6
4, 5, 6
600
25
25
600
25
25
600
25
25
mV pk
ms
ms
4, 12
7
Load fault recovery
For Notes to Specifications, refer to page 3
2
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ASA28XXD Series
Notes to Specifications
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Parameter guaranteed by line, load, and cross regulation tests.
Up to 80% of full power is available from either output provided the total output does not exceed 5W.
Bandwidth of DC to 20MHz is guaranteed by design. Tested for 20KHz to 2MHz.
Load current split equally between +V
OUT
and -V
OUT
.
1.0W load on output under test, 1.0W to 4.0W load change on other output.
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 may interfere with the operation of the load fault detection circuitry,
appearing as a short circuit during turn-on.
Parameter shall be tested as part of design characterization and after design or process changes. Thereafter, parameters shall
be guaranteed to the limits specified.
An overload is a condition with a load in excess of rated but less than that necessary to trigger the short circuit protection and is
the condition of maximum power dissipation.
Load step transition time between 2µs and 10µs.
Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±1% of V
OUT
at 50% load.
Input step transition time between 2µs and 10µs.
Turn-on delay time measurements is for either a step application of power at the input or the removal of ground connection from
enable pin (pin 5) with power applied to the input.
Block Diagram
+Input
6
+Output
1
Output
Return
2
-Output
3
Input
Return
7
Inhibit
5
Error
Amplifier
Case
8
Controller
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3
ASA28XXD Series
Mechanical Outline
1.075
0.800
0.270
1
2
3
4
5
1.075
0.800
±.005
8
7
6
0.025 ± .003 Dia Pins
0.220
Pin Designation
Pin #
1
2
3
4
5
6
7
8
Designation
+ Output
Output Return
- Output
NC
Inhibit
+ Input
Input Return
Case Ground
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit
Drawing Number
5962-94649
5962-95648
IR Standard
Part Number
ASA2815D
ASA2812D
4
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ASA28XXD Series
Device Screening
Requirement
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
N/A
Cond A
N/A
N/A
Cond A, C
N/A
Yes
N/A
N/A
N/A
N/A
25°C
MIL-STD-883 Method
No Suffix
N/A
N/A
ES
N/A
N/A
Yes
Cond B
500 Gs
N/A
48 hrs@hi temp
25°C
HB
N/A
N/A
Yes
Cond C
3000 Gs
N/A
-55°C, +25°C,
+125°C
N/A
Cond A, C
N/A
Yes
CH
Class H
N/A
Yes
Cond C
3000 Gs
N/A
-55°C, +25°C,
+125°C
10%
Cond A, C
N/A
Yes
-20°C to +85°C -55°C to +125°C
-55°C to +125°C -55°C to +125°C
160 hrs@125°C 160 hrs@125°C
Notes:
Best commercial practice
Sample tests at low and high temperatures
-55°C to +105°C for AHE, ATO, ATW
Part Numbering
ASA 28 05 D /CH
Model
Input Voltage
28 = 28V
Screening Level
(Please refer to Screening Table)
No Suffix, ES, HB, CH
Output Voltage
05 =
±5V
12 =
±12V
15 =
±15V
Output
D = Dual
WORLD HEADQUARTERS:
233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR SANTA CLARA:
2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 01/2007
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