characteristics and offers greater reliability and
radiation tolerance than devices incorporating
optical feedback circuits.
Three standard temperature grades are offered.
Refer to Part Number section for more severe
enviroments.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are available in four
screening grades to satisfy a wide range of
requirements. The CH grade is fully compliant to
the requirements of MIL-PRF-38534 for class H.
The HB grade is processed and screened to the
class H requirement, but may not necessarily meet
all of the other MIL-PRF-38534 requirements, e.g.,
element evaluation and Periodic Inspection (P.I.)
not required. Both grades are tested to meet the
complete group "A" test specification over the full
military temperature range without output power
deration. Two grades with more limited screening
are also available for use in less demanding
applications. Variations in electrical, mechanical
and screening can be accommodated. Contact
Lambda Advanced Analog for special requirements.
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FEATURES
18 To 40 Volt Input Range (28VDC Nominal)
±
12 and
±
15 Volt Outputs Available
Indefinite Short Circuit and Overload
Protection
3
22.8 W/in Power Density
30 Watts Output Power
Fast Loop Response For Superior Transient
Characteristics
Operating Temperature Range From -55°C to
+125°C Available
Popular Industry Standard Pin-Out
Resistance Seam Welded Case For Superior
Long Term Hermeticity
Efficiencies Up to 85%
Shutdown From External Signal
Full Military Screening
200,000 Hour MTBF at 85°C
MIL-PRF-38534 Compliant Versions
Available
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Soldering Temperature
Case Temperature
-0.5V to 180V
300°C for 10 seconds
Operating-55°C to +125°C
Storage -65°C to +135°C
ATW2812D
TABLE I. Electrical Performance Characteristics
Test
Symbol
Conditions
-55°C
≤
T
C
≤
+125°C
V
IN
= 28 V dc ±5%, C
L
= 0 unless
otherwise specified
Group A
subgroups
Device
types
Limits
Unit
Min
Output voltage
V
OUT
I
OUT
= 0
1
2,3
Output current 1/ 2/
Output ripple voltage 3/
I
OUT
V
RIP
V
IN
= 18, 28, and 40 V dc, each output
V
IN
= 18, 28, and 40 V dc,
B.W. = 20 Hz to 2 MHz
V
IN
= 18, 28, and 40 V dc,
I
OUT
= 0, 1250, and 2500 mA
1,2,3
1,2,3
All
All
All
±11.88
±11.76
250
Max
±12.12
±12.24
2250
85
mA
mV p-p
V
Line
regulation 4/
VR
LINE
1
All
30
mV
2,3
Load regulation 4/
VR
LOAD
V
IN
= 18, 28, and 40 V dc,
I
OUT
= 0, 1250, and 2500 mA
10 percent to 90 percent load change
I
OUT
= 0, inhibit (pin 8) tied to input
return (pin 10)
I
OUT
= 0,
inhibit (pin 8) = open
Input ripple current 3/ 4/
I
RIP
I
OUT
= 2500 mA,
B.W. = 20 Hz to 2 MHz
I
OUT
= 2500 mA,
T
C
= +25°C
Input to output or any pin
to case (except pin 7) at
500 V dc, T
C
= +25°C
No effect on dc performance,
T
C
= +25°C, total for both outputs
Overload, T
C
= +25°C 8/
1,2,3
All
1,2,3
All
60
120
mV
Cross regulation 5/
Input current
VR
CROS
I
IN
1,2,3
1,2,3
All
All
3.5
18
%
mA
50
50
mA p-p
Efficiency 4/
E
FF
1
All
80
%
Isolation
ISO
1
All
100
MΩ
Capacitive load 6/ 7/
Power dissipation
load fault
C
L
P
D
4
1
All
All
200
12
µF
W
Short circuit, T
C
= +25°C
9
See footnotes at end of table.
2
ATW2812D
TABLE I. Electrical Performance Characteristics - Continued
Test
Symbol
Conditions
-55°C
≤
T
C
≤
+125°C
V
IN
= 28 V dc ±5%, C
L
= 0 unless
otherwise specified
Group A
Subgroups
Device
types
Limits
Unit
Min
Switching frequency 4/
F
S
I
OUT
= 2500 mA
4,5,6
01
02
03
Output response to step
transient load changes
4/ 9/
VO
TLOA
D
Max
300
270
300
+400
mV pk
KHz
250
250
275
-400
1250 mA to/from 2500 mA
4,5,6
All
0 mA to/from 2500 mA
Recovery time, step
transient load changes
4/ 9/ 10/
TT
LOAD
1250 mA to/from 2500 mA
4,5,6
4,5,6
All
All
-800
+800
70
µs
0 mA to/from 1250 mA
1250 mA to/from 0 mA
Output response transient
step line changes 4/ 7/ 11/
Recovery time transient
step line changes 4/ 7/ 10/
11/
Turn on overshoot 4/
Turn on delay 4/ 12/
Load fault recovery
Weight
7/
VO
TLINE
Input step from/to 18 to 40 V dc,
I
OUT
= 2500 mA
Input step from/to 18 to
40 V dc,
I
OUT
= 2500 mA
I
OUT
= 0 and 2500 mA
I
OUT
= 0 and 2500 mA
4,5,6
4,5,6
4,5,6
All
All
All
-800
500
5
+800
ms
mV pk
TT
LINE
4,5,6
All
4000
µs
VTon
OS
Ton
D
Tr
LF
4,5,6
4,5,6
4,5,6
All
All
All
750
14
14
75
mV pk
ms
ms
grams
Flange
Notes:
1/
2/
3/
4/
5/
6/
Parameter guaranteed by line load, and cross regulation tests.
Up to 90 percent of full power is available from either output provided the total output does not exceed 30 W.
Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz.
Load current split equally between +V
OUT
and -V
OUT
.
Three-watt load on output under test, 3 watt to 27 watt 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 in Table I.
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.
Load step transition time between 2 and 10 microseconds.
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.
Input step transition time between 2 and 10 microseconds.
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 8) while
power is applied to the input.
7/
8/
9/
10/
11/
12/
3
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Soldering Temperature
Case Temperature
-0.5V to 180V
300°C for 10 seconds
Operating-55°C to +125°C
Storage -65°C to +135°C
ATW2815D
TABLE II - Electrical Performance Characteristics
Test
Symbol
Conditions
-55°C
≤
T
C
≤
+125°C
V
IN
= 28VDC ±5%, C
L
= 0 Unless
Otherwise Specified
Group A
Subgroups
Device
type
Limits
Unit
Min
Output Voltage
V
OUT
VIN = 18, 28, 40 VDC
I
OUT
= 0
1
ALL
±14.85
Max
±15.15
VDC
2, 3
Output Current 11/ 13/
Output Ripple Voltage 8/
I
OUT
V
RIP
V
IN
= 18, 28, 40 VDC
VIN = 18, 28 40 VDC
B.W. = DC TO 1 MHz
V
IN
= 18, 28, 40 VDC
V
IN
= 18, 28, 40 VDC
I
OUT
= 0, 1000, 2000 mA
1, 2, 3
1, 2, 3
ALL
ALL
ALL
±14.70
0.200
±15.30
2000
85
VDC
mADC
mVp-p
Output Power 4/ 11/
Line Regulation 9/ 10/
P
OUT
VR
LINE
1, 2, 3
1
ALL
ALL
30
35
W
mV
2, 3
Load Regulation 9/ 10/
VR
LOAD
V
IN
= 18, 28, 40 VDC
I
OUT
= 0, 1000, 2000 mA
I
OUT
=0, inhibit (pin 8) = 0
I
OUT
=0, inhibit (pin 8) Open
Input Ripple Current
Efficiency
Isolation
I
RIP
EFF
ISO
I
OUT
= 2000mA
I
OUT
= 2000mA T
C
= 25°C
Input to output or any pin to case
(except pin 8) at 500 VDC,
T
C
=
25°C
No effect on DC performance
T
C
= 25°C
Overload, T
C
= 25°C 3/
Short Circuit, T
C
= 25°C
Switching frequency
F
S
I
OUT
= 2000 mA
1, 2, 3
ALL
ALL
75
150
mV
mV
Input Current
I
IN
1, 2, 3
1, 2, 3
1, 2, 3
1
1
ALL
ALL
ALL
ALL
ALL
80
100
12
30
60
mADC
mADC
mAp-p
%
Mohms
Capacitive Load 6/ 12/
Power dissipation load
fault
C
L
4
ALL
500
ufd
P
D
1
1
1, 2, 3
1, 2, 3
1, 2, 3
ALL
ALL
01
02
03
237
230
250
9
9
263
245
265
W
W
KHz
KHz
KHz
See footnotes at end of table.
4
ATW2815D
TABLE II - Electrical Performance Characteristics (continued)
Test
Symbol
Conditions
-55°C
≤
T
C
≤
+125°C
V
IN
= 28VDC ±5%, C
L
= 0 UNLESS
OTHERWISE SPECIFIED
Group A
Subgroups
Device
Type
Limits
Unit
Min
Output response to step
transient load changes
7/ 9/ 10/
VO
TLOAD
50% load to/from 100% load
4, 5, 6
All
-300
Max
+300
mV pk
No load to 100% load
100% load to no load
Recovery time, step
transient load changes
1/ 7/
TT
LOAD
50% load to/from 100% load
4, 5, 6
4, 5, 6
4, 5, 6
All
All
All
-800
+800
-800
+800
25
mV pk
us
No load to 50% load
50% load to no load
Output response to
transient step line changes
5/ 12/
VO
TLINE
Input step from 18 to 40VDC
4, 5, 6
4, 5, 6
4, 5, 6
All
All
All
500
7
+180
us
ms
mV pk
Input step from 40 to 18VDC
Recovery time transient
step line changes 1/ 5/ 12/
TT
LINE
Input step from 18 to 40VDC
4, 5, 6
4, 5, 6
All
All
-600
400
mV pk
us
Input step from 40 to 18VDC
Turn-on overshoot
Turn-on delay 2/
Load fault recovery 12/
Weight
Notes:
1/
2/
3/
4/
5/
6/
7/
8/
9/
10/
11/
12/
13/
VTON
OS
TON
D
Tr
LF
I
OUT
= 0, 2000mA
I
OUT
= 0, 2000mA
V
IN
= 18 to 40 VDC
Flange
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
All
All
All
All
400
750
12
12
75
us
mV pk
ms
grams
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.
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 8) while
power is applied to the input.
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.
Above +125°C case, derate output power linearly to 0 at +135°C case.
Input step transition time between 2 and 10 microseconds.
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 will interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on.
Load step transition time between 2 and 10 microseconds.
Bandwidth guaranteed by design. Tested for 20 KHz.
Load current split equally between +V
OUT
and -V
OUT.
When operating with unbalanced loads, at least 25% of the load must be on the positive output to maintain regulation.
Parameter guaranteed by line and load regulation tests.
Parameter shall be tested as part of design characterization and after design or process changes. Thereafter parameters shall be guaranteed to the limits
specified in Table II.
Up to 90% of full power is available from either output provided the total output does not exceed 30 watts.
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