LAMBDA ADVANCED ANALOG INC.
λ
ASA2800S Series
Hybrid - High Reliability
Dual Output DC/DC Converter
DESCRIPTION
The ASA2800S 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
feedback 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 16 to
40 volt input range. Output Power of up to 4 watts 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
400ua. The open circuit voltage of the inhibit pin is
11.5 +/-0.5 volts.
These converters are manufactured in a facility fully
qualified to MIL-PRF-38534. All processes used to
manufacture these converters have been qualified to
enable Lambda Advanced Analog to deliver
compliant devices.
Three standard temperature
grades are offered with the screening options. Refer
to Part Number section. The CH grade converters
are fully compliant to MIL-PRF-38534 for class H.
The HB grade converters are processed with the
same screening as the CH grade, but do not have
class H element evaluation as required by MIL-PRF-
38534. These two grades are fully tested and operate
over the full military temperature range without
derating of output power. A commercial grade is also
available. Variations in electrical, mechanical and
screening can be accommodated.
Extensive
computer simulation using complex modeling enables
rapid design modification to be provided. Contact
Lambda Advanced Analog with specific requirements.
FEATURES
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Up to 5 watt output power
±5, ±12, ±15 volt outputs
High reliability
Wide input voltage range – 16 to 40 volts
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
Specifications
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Power Output
Soldering
Temperature Range
-0.5 V to 50 V Continuous. 80 V, 100 mSec
Internally limited (6.5 w typical)
300°C for 10 Sec.
Operating
-55°C to +125°C Case
Storage
-65°C to +150°C
ASA2800S
TEST
Output voltage
Output current
1
Conditions
-55°
≤
T
C
≤+125°C
V
IN
= 28V dc ±5% C
L
= 0
unless otherwise specified
I
OUT
= 0
V
IN
= 16, 28, and 40 V dc
each output
2
Group A
Subgroups
1
2, 3
1, 2, 3
1
2, 3
1
2, 3
1
2, 3
1, 2, 3
ASA2805S/XX
Limits
Min
±4.95
±4.90
Max
±5.05
±5.10
1000
190
475
25
50
25
50
18
50
ASA2812S/XX
Limits
Min
±11.88
±11.76
Max
±12.12
±12.24
417
200
290
±25
±50
±25
±50
18
50
100
ASA2815S/XX
Limits
Min
±14.85
±14.70
Max
±15.15
±15.30
333
200
290
±25
±50
±25
±50
18
50
100
mA
PP
mA
mV
mV
mA
mV
PP
Unit
V
Output ripple voltage
V
IN
= 16, 28 and 40 V dc
B.W. = 20 Hz to 2 MHz
Line regulation
Load regulation
V
IN
= 16, 28, and 40 V dc
I
OUT
= 0, 50%, 100% I
MAX
V
IN
= 16, 28, and 40 V dc
I
OUT
= 0, 50%, 100% I
MAX
I
OUT
= 0 inhibit (Pin 5) tied to
input return (Pin 7)
I
OUT
= 0 Pin5 open
Input current
Input ripple current
2
I
OUT
= Full Load
B.W. = 20 Hz to 2 MHz
1, 2, 3
100
Efficiency
I
OUT
= Full Load
1, 2, 3
66
71
68
71
68
100
%
Isolation
Input to output or any pin to
case (except pin 8) at 500 V
dc, Tc = +25° C
3, 4
1
100
100
MΩ
µf
W
KHz
mV pk
Capacitive load
No effect on dc performance,
Tc = +25°C
Overload
5
4
1, 2, 3
4, 5, 6
4
5, 6
500
-300
-450
-500
-750
250
4.0
2.0
600
+300
+450
+500
+700
200
-750
500
-450
100
4.0
2.0
600
+450
500
-400
100
4.0
2.0
600
+450
Power dissipation load fault
Switching frequency
4
Short circuit
I
OUT
= Full Load
Half Load
óFull
Load
Output response to step
6
transient load changes
No Load
ó
Half Load
4
5, 6
+750
-800
+750
Recovery time, step transient
load changes
Hlaf Load
ó
Full Load
4, 5, 6
No Load
ó
Hlaf Load
Half Load
ó
No Load
100
1
1
1000
100
1
1
1000
1
1
4, 5, 6
500
µS
ms
Output response transient
step line changes
Input step 16 to 40 V dc
I
OUT
= Full Load
4, 8
mV pk
Input step 40 to 16 V dc
I
OUT
= Full Load
Recovery time transient step
line changes
4, 7, 10, 11
4, 8
4, 5, 6
-500
-1000
-1000
Input step
ó
16 to 40 V dc
I
OUT
= Full Load
4, 7, 8
4, 5, 6
800
800
800
µS
Turn on overshoot
I
OUT
= No Load
I
OUT
= Full Load
4, 5, 6
4, 5, 6
9
600
600
20
20
600
600
25
25
600
600
25
25
mV pk
Turn on delay
Load fault recovery
4
I
OUT
= No Load and Full Load
4, 5, 6
4, 5, 6
ms
ms
2
Notes
1.
Parameter guaranteed by line and load regulation tests.
2.
Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz.
3.
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.
4.
Parameter shall be tested as part of design characterization and after design or process changes.
5.
An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power
dissipation.
6.
Load step transition time between 2 and 10 microseconds.
7.
Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±1 percent of V
OUT
at 50 percent load.
8.
Input step transition time between 2 and 10 microseconds.
9.
Turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input.
3
Screening Levels and Performance Variations for ASA2800 Series Converters.
MIL-STD-883
Method
No
Suffix
-20°C to +85°C
Requirement
Temperature Range
Element Evaluation
Internal Visual
Temperature Cycle
Constant Acceleration
Burn-in
Final Electrical (Group A)
Seal, Fine & Gross
External Visual
ES
Suffix
-55°C to +125°C
HB
Suffix
-55°C to +125°C
CH
Suffix
-55°C to +125°C
MIL-PRF-38534
2017
1010
2001,
1015
MIL-PRF-38534
1014
2009
¬
ü
Cond B
500g
96hrs @ 125°C
ü
Cond C
Cond A
160hrs @ 125°C
-55, +25, +125°C
Cond A, C
ü
ü
Cond C
Cond A
160hrs @ 125°C
-55, +25, +125°C
Cond A, C
ü
25°C
Cond C
¬
25°C
Cond A, C
ü
¬
per Commercial Standards
Part Numbering/Ordering Information
ASA 28 05 S / CH
Model
Input Voltage
28 = 28V
Screening
–
, ES, HB, CH
Output Voltage
5 = +5, 12 = +12,
15 = +15
Outputs
S = Single
D = Dual
Available Standard Millitary Drawing (SMD) Cross Reference
Lambda Advanced Analog Part No.
ASA2805S/CH
ASA2812S/CH
ASA2815S/CH
Standard Military Drawing No.
5962-94629
5962-94631
5962-94630
©
Lambda Advanced Analog
The information in this data sheet has been carefully checked and is believed to be accurate; however no
responsibility is assumed for possible errors. These specifications are subject to change without notice.
9849
LAMBDA ADVANCED ANALOG INC.
λ
MIL-PRF-38534 Certified
ISO 9001 Registered
2270 Martin Avenue
Santa Clara CA 95050-2781
(408) 988-4930 FAX (408) 988-2702
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