characteristics and offers greater reliability and
radiation tolerance than devices incorporating
optical feedback circuits.
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.
n
n
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n
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n
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FEATURES
17 To 40 Volt Input Range (28VDC Nominal)
±
12 and
±
15 Volt Outputs Available
Indefinite Short Circuit and Overload
Protection
3
12.9W/in Power Density
15 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 82%
Shutdown From External Signal
Military Screening
314,000 Hour MTBF at 85°C, AUC
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
AHE2812D
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 9/ 11/
Output ripple voltage 8/ 9/
I
OUT
V
RIP
V
IN
= 17, 28, and 40 V dc
V
IN
= 17, 28, and 40 V dc
B.W. = dc to 2 mHz
V
IN
= 17, 28, and 40 V dc
V
IN
= 17, 28, and 40 V dc
I
OUT
= 0, ±313, and ±625 mA
1,2,3
1,2,3
All
All
All
±11.88
±11.76
0.0
Max
±12.12
±12.24
±625
60
mA
mV p-p
V
Output power 4/ 9/ 11/
Line
9/
regulation 10/
P
OUT
VR
LINE
1,2,3
1
All
All
15
30
W
mV
2,3
Load
regulation 9/
Input current
VR
LOAD
V
IN
= 17, 28, and 40 V dc
I
OUT
= 0, ±313, and ±625 mA
I
OUT
= 0, inhibit (pin 2) tied to input
return (pin 10)
I
OUT
= 0,
inhibit (pin 2) = open
Input ripple current 8/
I
RIP
I
OUT
= ±625 mA
B.W. = dc to 2 MHz
I
OUT
= ±625 mA,
T
C
= +25°C
Input to output or any pin
to case (except pin 8) at 500 V dc, T
C
=
+25°C
No effect on dc performance,
T
C
= +25°C
Overload, T
C
= +25°C
3/
1,2,3
All
1,2,3
All
60
120
mV
I
IN
1,2,3
All
18
mA
40
50
mA p-p
Efficiency
E
FF
1
All
80
%
Isolation
ISO
1
All
100
MΩ
Capacitive load 6/ 12/
C
L
4
All
200
µF
Power dissipation
load fault
P
D
1
All
6
W
Short circuit, T
C
= +25°C
See footnotes at end of table
6
2
AHE2812D
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
9/
Max
275
KHz
F
S
I
OUT
= ±625 mA
4,5,6
01
225
02
03
Output response to step transient
load changes
7/
VO
TLOAD
50 percent load to/from 100 percent load
4
All
225
250
-300
245
275
+300
mV pk
5,6
No load to/from 50 percent load
4
5,6
Recovery time step transient load
changes
1/ 7/
TT
LOAD
50 percent load to/from 100 percent load
4
5,6
No load to 50 percent load
50 percent load to no load
Output response to transient step
line changes
5/ 12/
VO
TLINE
Input step 17 TO 40 V dc
Input step 40 TO 17 V dc
Recovery time transient step
line changes
1/ 5/ 12/
TT
LINE
Input step 17 TO 40 V dc
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
All
All
All
All
All
All
All
-450
-500
-750
+450
+500
+750
70
100
1500
5
1200
-1500
4
ms
ms
mV pk
µs
Input step 40 TO 17 V dc
Turn on overshoot
Turn on delay
2/ 9/
Load fault recovery
12/
9/
4,5,6
4,5,6
4,5,6
4,5,6
All
All
All
All
4
600
10
10
mV pk
ms
ms
VTon
OS
Ton
D
Tr
LF
I
OUT
= 0 and ±625 mA
I
OUT
= 0 and ±625 mA
Notes:
1/ 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.
2/ 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/ 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.
4/ Total power at both outputs. For operation at 16 V dc input, derate output power by 33 percent.
5/ Input step transition time between 2 and 10 microseconds.
6/ 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.
7/ Load step transition time between 2 and 10 microseconds.
8/ Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz.
9/ Tested at each output.
10/ When operating with unbalanced loads, at least 25 percent of the load must be on the positive output to maintain regulation.
11/ Parameter guaranteed by line and load regulation tests.
12/ 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.
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
AHE2815D
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 9/
11/
Output ripple 8/
voltage
9/
Output power 4/
Line
9/
regulation 10/
9/ 11/
I
OUT
V
IN
= 17, 28, and 40 V dc
1,2,3
All
All
±14.85
±14.70
0.0
Max
±15.15
±15.30
±500
mA
V
V
RIP
V
IN
= 17, 28, and 40 V dc
B.W. = dc to 2 mHz
V
IN
= 17, 28, and 40 V dc
V
IN
= 17, 28, and 40 V dc
I
OUT
= 0, ±250, and ±500 mA
1,2,3
All
60
mV p-p
P
OUT
VR
LINE
1,2,3
1
All
All
15
35
W
mV
2,3
Load
regulation 9/
Input current
VR
LOAD
V
IN
= 17, 28, and 40 V dc
I
OUT
= 0, ±250, and ±500 mA
I
OUT
= 0, inhibit (pin 2) tied to input return
(pin 10)
I
OUT
= 0,
inhibit (pin 2) = open
Input ripple 8/
current
I
RIP
I
OUT
= ±500 mA
B.W. = dc to 2 MHz
1,2,3
All
1,2,3
All
75
150
mV
I
IN
1,2,3
All
18
ma
40
50
mA p-p
Efficiency
E
FF
I
OUT
= ±500 mA,
T
C
= +25°C
Input to output or any pin
to case (except pin 8) at 500 V dc, T
C
=
+25°C
No effect on dc performance,
T
C
= +25°C
Overload, T
C
= +25°C
3/
1
All
80
%
Isolation
ISO
1
All
100
MΩ
Capacitive load 6/ 12/
C
L
4
All
200
µF
Power dissipation
load fault
P
D
1
All
6
W
4
AHE2815D
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
9/
F
S
I
OUT
= ±500 mA
4,5,6
01
225
Max
275
KHz
02
03
Output response to
load changes 7/
step transient
VO
TLOAD
50 percent load to/from 100 percent load
4
All
225
250
-300
245
275
+300
mV pk
5,6
No load to/from 50 percent load
4
5,6
Recovery time step transient load
changes transient load changes 1/ 7/
TT
LOAD
50 percent load to/from 100 percent load
4
5,6
No load to 50 percent load
50 percent load to no load
Output response to transient step line
changes 5/ 12/
VO
TLINE
Input step 17 to 40 V dc
Input step 40 to 17 V dc
Recovery time transient step line
changes 1/ 5/ 12/
TT
LINE
Input step 17 to 40 V dc
Input step 40 to 17 V dc
Turn on overshoot
Turn on delay 2/ 9/
Load fault recovery
12/
9/
VTon
OS
Ton
D
Tr
LF
I
OUT
= 0 and ±500 mA
I
OUT
= 0 and ±500 mA
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
All
All
All
All
All
All
All
All
All
All
All
-450
-500
-750
+450
+500
+750
70
100
1500
5
1500
-1500
4
4
600
10
10
mV pk
ms
ms
ms
ms
mV pk
µs
Notes:
1/
2/
3/
4/
5/
6/
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.
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.
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.
Total power at both outputs. For operation at 16 V dc input, derate output power by 33 percent.
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 may
interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on.
7/ Load step transition time between 2 and 10 microseconds.
8/ Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz.
9/ Tested at each output.
10/ When operating with unbalanced loads, at least 25 percent of the load must be on the positive output to maintain regulation.
11/ Parameter guaranteed by line and load regulation tests.
12/ 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.
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