range for use in military and industrial applications.
Designed to MIL-STD-704 input requirements, these
devices have nominal 28V
DC
inputs with +5, +12V
and +15V single outputs.
The circuit design
incorporates a pulse width modulated push-pull
topology operating in the feed-forward mode at a
nominal switching frequency of 270KHz. Input to
output isolation is achieved through the use of
transformers in the forward and feedback circuits.
The advanced feedback design provides fast loop
response for superior line and load transient
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. They are provided in
a flanged package 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
19 To 40 Volt Input Range (28V
DC
Nominal)
30 Watts Output Power
Indefinite Short Circuit and Overload
Protection
22.8 W/in
3
Power Density
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 83%
Shutdown From External Signal
Military Screening
250,000 Hour MTBF at 85°C
MIL-PRF-38534 Compliant Versions
Available
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Soldering Temperature
Case Temperature
-0.5V to 50V
300°C for 10 seconds
Operating-55°C to +125°C
Storage -65°C to +135°C
ATW2805S
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/
Output ripple voltage 2/
I
OUT
V
RIP
V
IN
= 19, 28, and 40 V dc
V
IN
= 19, 28, and 40 V dc
B.W. = dc to 2 MHz
V
IN
= 19, 28, and 40 V dc
V
IN
= 19, 28, and 40 V dc
I
OUT
= 0, 3000, and 6000 mA
1,2,3
1,2,3
All
All
All
4.95
4.90
0.0
Max
5.05
5.10
6000
50
mA
mV p-p
V
Output power 1/ 3/
Line regulation 4/
P
OUT
VR
LINE
1,2,3
1
All
All
30
5
W
mV
2,3
Load regulation 4/
VR
LOAD
V
IN
= 19, 28, and 40 V dc
I
OUT
= 0, 3000, and 6000 mA
1,2,3
All
20
30
mV
Input current
I
IN
I
OUT
= 0, inhibit (pin 2) tied to input
return (pin 10)
I
OUT
= 0, inhibit (pin 2) = open
1,2,3
All
18
mA
40
1,2,3
All
20
mA p-p
Input ripple current 2/
I
RIP
I
OUT
= 6000 mA
B.W. = dc to 2 MHz
I
OUT
= 6000 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
Overload, T
C
= +25°C 7/
Short circuit, T
C
= +25°C
Efficiency
E
FF
1
All
78
%
Isolation
ISO
1
All
100
MΩ
Capacitive load 5/ 6/
C
L
4
All
500
µF
Power dissipation load fault
P
D
1
All
12
9
W
See footnotes at end of table.
2
ATW2805S
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
Type
Limits
Unit
Min
Switching frequency
F
S
I
OUT
= 6000 mA
4,5,6
01
02
03
Output response to step
transient load changes 8/
VO
TLOAD
4000 mA to/from 6000 mA
4,5,6
All
250
250
275
-500
Max
300
270
300
+500
mV pk
kHz
500 mA to/from 2500 mA
Recovery time step transient
load changes 8/ 9/
TT
LOAD
4000 mA to/from 6000 mA
4,5,6
4
5,6
All
All
-500
+500
100
200
µs
500 mA to/from 2500 mA
4
5,6
All
100
200
Turn on overshoot
Turn on delay 10/
Load fault recovery 6/ 10/
VTon
OS
Ton
D
Tr
LF
I
OUT
= 0 and 6000 mA
I
OUT
= 0 and 6000 mA
4,5,6
4,5,6
4,5,6
All
All
All
500
12
12
mV pk
ms
ms
Notes:
1/
2/
3/
4/
5/
Parameter guaranteed by line and load regulation tests.
Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz.
Above +125°C case, derate output power linearly to 0 at +135°C.
Output voltage measured at load with remote sense leads connected across load.
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.
6/ 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.
7/ 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.
8/ Load step transition time between 2 and 10 microseconds.
9/ 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.
10/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
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Soldering Temperature
Case Temperature
-0.5V to 50V
300°C for 10 seconds
Operating-55°C to +125°C
Storage -65°C to +135°C
ATW2812S
TABLE II. 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/
Output ripple voltage 2/
I
OUT
V
RIP
V
IN
= 19, 28, and 40 V dc
V
IN
= 19, 28, and 40 V dc
B.W. = dc to 2 MHz
V
IN
= 19, 28, and 40 V dc
V
IN
= 19, 28, and 40 V dc
I
OUT
= 0, 3000, and 6000 mA
1,2,3
1,2,3
All
All
All
4.95
4.90
0.0
Max
5.05
5.10
6000
50
mA
mV p-p
V
Output power 1/ 3/
Line
regulation 4/
P
OUT
VR
LINE
1,2,3
1
All
All
30
5
W
mV
2,3
Load
regulation 4/
VR
LOAD
V
IN
= 19, 28, and 40 V dc
I
OUT
= 0, 3000, and 6000 mA
1,2,3
All
20
30
mV
Input current
I
IN
I
OUT
= 0, inhibit (pin 2) tied to input
return (pin 10)
I
OUT
= 0, inhibit (pin 2) = open
1,2,3
All
18
mA
40
1,2,3
All
20
mA p-p
Input ripple current 2/
I
RIP
I
OUT
= 6000 mA
B.W. = dc to 2 MHz
I
OUT
= 6000 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
Overload, T
C
= +25°C 7/
Short circuit, T
C
= +25°C
Efficiency
Isolation
E
FF
ISO
1
1
All
All
78
100
%
MΩ
Capacitive load 5/ 6/
C
L
4
All
500
µF
Power dissipation load fault
P
D
1
All
12
9
W
See footnotes at end of table.
4
ATW2812S
TABLE II. 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
Type
Limits
Unit
Min
Switching frequency
F
S
I
OUT
= 6000 mA
4,5,6
01
02
03
Output response to step
transient load changes 8/
VO
TLOAD
4000 mA to/from 6000 mA
4,5,6
All
250
250
275
-500
Max
300
270
300
+500
mV pk
kHz
500 mA to/from 2500 mA
Recovery time step transient
load changes 8/ 9/
TT
LOAD
4000 mA to/from 6000 mA
4,5,6
4
5,6
All
All
-500
+500
100
200
µs
500 mA to/from 2500 mA
4
5,6
All
100
200
Turn on overshoot
Turn on delay 10/
Load fault recovery 6/ 10/
Weight
VTon
OS
Ton
D
Tr
LF
I
OUT
= 0 and 6000 mA
I
OUT
= 0 and 6000 mA
4,5,6
4,5,6
4,5,6
All
All
All
500
12
12
75
mV pk
ms
ms
grams
Flange
Notes:
1/
2/
3/
4/
5/
Parameter guaranteed by line and load regulation tests.
Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz.
Above +125°C case, derate output power linearly to 0 at +135°C.
Output voltage measured at load with remote sense leads connected across load.
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.
6/ 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.
7/ 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.
8/ Load step transition time between 2 and 10 microseconds.
9/ 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.
10/ 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
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