PD-94555B
AHE28XXD SERIES
28V Input, Dual Output
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
Description
The AHE Series of DC/DC converters feature high
power density and an extended temperature range for
use in military and industrial applications. Designed to
MIL-STD-704D input requirements, these devices have
nominal 28VDC inputs with ±5V, ±12V and ±15V dual
outputs to satisfy a wide range of requirements. The
circuit design incorporates a pulse width modulated
push-pull topology operating in the feed-forward mode
at a nominal switching frequency of 250KHz. 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.
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. Contact IR Santa Clara for special
requirements.
AHE
Features
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17V to 40VDC Input Range
28VDC Nominal Input
± 5V, ±12V and ±15V Outputs Available
Indefinite Short Circuit and Overload
Protection
3
12.9W/in Power Density
15W 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)
Standard Microcircuit Drawings Available
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1
01/08/07
AHE28XXD Series
Specifications
Absolute Maximum Ratings
Input voltage
Soldering temperature
Operating case temperature
Storage case temperature
-0.5V to +50VDC
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
AHE2805D
Table I. Electrical Performance Characteristics
Test
Symbol
Conditions
-55°C
≤
Tc
≤+125°C
Vin = 28 Vdc ±5%, C
L
= 0
Unless otherwise specified
I
OUT
= 0
V
IN
= 17, 28, and 40 V dc
V
IN
= 17, 28, and 40 V dc,
B.W. = DC to 2MHz
V
IN
=17,28, and 40 V dc
V
IN
= 17, 28, and 40 V dc,
I
out
= 0,
±313,
and
±625mA
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
I
OUT
=
±625mA
B.W. = DC to 2MHz
I
OUT
=
±625mA
T
C
= +25°C
Input to output or any pin
to case (except pin 8)
at 500V dc Tc = +25ºC
No effect on dc
performance,
Tc = +25ºC
3
Overload, T
C
= +25°C
Short circuit, T
C
= +25°C
I
OUT
=
±625mA
50% load to/from100%load
Group A
Subgroups
Device
Types
Limits
Unit
Output voltage
Output current
9, 11
8, 9
V
OUT
I
OUT
V
RIP
P
OUT
VR
LINE
VR
LOAD
I
IN
1
2,3
1,2,3
1,2,3
1,2,3
1
2,3
1,2,3
1,2,3
All
All
All
All
All
All
All
Min
±4.95
±4.90
0.0
Max
±5.05
±5.10
±625
60
V
mA
mVp-p
W
mV
mV
mA
Output ripple voltage
Output power
9
Line
10
Regulation
Load
9
Regulation
Input current
4, 9, 11
15
25
50
110
18
40
Input ripple current
Efficiency
Isolation
Capacitive load
8
I
RIP
E
FF
ISO
1,2,3
1
1
4
1
1
4,5,6
All
All
All
All
All
80
100
50
mAp-p
%
MΩ
6, 12
C
L
P
D
9
200
6.0
6.0
275
245
275
+300
+450
+500
+750
µF
W
Power dissipation
load fault
Switching frequency
F
S
Output response to step
7
transient load changes
VO
TLOAD
4
5,6
4
5,6
01
02
03
All
225
225
250
-300
-450
-500
-750
KHz
mVpk
No load to/from 50% load
All
For Notes to Specifications, refer to page 3
2
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AHE28XXD Series
Table I. Electrical Performance Characteristics -
continued
Test
Symbol
Conditions
-55°
≤Tc ≤+125°C
Vin = 28 Vdc ±5%, C
L
= 0
unless otherwise
specified
50% load to/from 100%
load
Group A
Subgroups
Device
Types
Limits
AHE2805D
Unit
Min
Recovery time step
transient load
1, 7
changes
TT
LOAD
4
All
Max
70
µs
Output response
transient step line
5, 12
changes
Recovery time
transient step
1, 5, 12
line changes
Turn on overshoot
2, 9
Turn on delay
9
VO
TLINE
No load to 50% load
50% load to no load
Input step 17 to 40V dc
Input step 40 to 17V dc
Input step 17 to 40V dc
Input step 40 to 17V dc
I
OUT =
0 and
±625mA
I
OUT
= 0 and
±625mA
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
4,5,6
All
All
All
All
All
All
All
All
All
100
1500
5.0
1200
-1500
4.0
4.0
600
10
10
ms
mVpk
TT
LINE
ms
VTon
OS
Ton
D
Tr
LF
mVpk
ms
ms
Load fault recovery
12
Notes to Specifications
1 Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±0.1 % of V
OUT
at 50 % 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 16V dc input, derate output power by 33 %.
5 Input step transition time between 2.0µs and 10µs.
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 2.0µs and 10µs.
8 Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz.
9 Tested at each output.
10 When operating with unbalanced loads, at least 25 % 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.
www.irf.com
3
AHE28XXD Series
Specifications
Absolute Maximum Ratings
Input voltage
Soldering temperature
Operating case temperature
Storage case temperature
-0.5V to +50VDC
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
AHE2812D
Table II. Electrical Performance Characteristics
Test
Symbol
Conditions
-55°C
≤
Tc
≤+125°C
Vin = 28 Vdc ±5%, C
L
= 0
Unless otherwise specified
I
OUT
= 0
V
IN
= 17, 28, and 40 V dc
V
IN
= 17, 28, and 40 V dc,
B.W. = DC to 2MHz
V
IN
=17,28, and 40 V dc
V
IN
= 17, 28, and 40 V dc,
I
out
= 0,
±313,
and
±625mA
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
I
OUT
=
±625mA
B.W. = DC to 2MHz
I
OUT
=
±625mA
T
C
= +25°C
Input to output or any pin
to case (except pin 8)
at 500V dc Tc = +25ºC
No effect on dc
performance,
Tc = +25ºC
3
Overload, T
C
= +25°C
Short circuit, T
C
= +25°C
I
OUT
=
±625mA
Group A
Subgroups
Device
Types
Limits
Unit
Output voltage
Output current
9, 11
8, 9
V
OUT
I
OUT
V
RIP
P
OUT
VR
LINE
VR
LOAD
I
IN
1
2,3
1,2,3
1,2,3
1,2,3
1
2,3
1,2,3
1,2,3
All
All
All
All
All
All
All
Min
±11.88
±11.70
0.0
Max
±12.12
±12.24
±625
60
V
mA
mVp-p
W
mV
mV
mA
Output ripple voltage
Output power
9
Line
10
Regulation
Load
9
Regulation
Input current
4, 9, 11
15
30
60
120
18
40
Input ripple current
Efficiency
Isolation
Capacitive load
8
I
RIP
E
FF
ISO
1,2,3
1
1
4
1
1
4,5,6
All
All
All
All
All
01
02
03
All
225
225
250
-300
-450
-500
-750
80
100
50
mAp-p
%
MΩ
6, 12
C
L
P
D
9
200
6.0
6.0
275
245
275
+300
+450
+500
+750
µF
W
KHz
Power dissipation
load fault
Switching frequency
F
S
Output response to step
7
transient load changes
VO
TLOAD
50% load to/from100%load
4
5,6
4
5,6
mVpk
No load to/from 50% load
All
4
www.irf.com
AHE28XXD Series
Table II. Electrical Performance Characteristics -
continued
Test
Symbol
Conditions
-55°
≤Tc ≤+125°C
Vin = 28 Vdc ±5%, C
L
= 0
unless otherwise
specified
50% load to/from 100%
load
Group A
Subgroups
Device
Types
Limits
AHE2812D
Unit
Min
Recovery time step
transient load
1, 7
changes
TT
LOAD
4
All
Max
70
µs
Output response
transient step line
5, 12
changes
Recovery time
transient step
1, 5, 12
line changes
Turn on overshoot
2, 9
Turn on delay
9
VO
TLINE
No load to 50% load
50% load to no load
Input step 17 to 40V dc
Input step 40 to 17V dc
Input step 17 to 40V dc
Input step 40 to 17V dc
I
OUT =
0 and
±625mA
I
OUT
= 0 and
±625mA
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
4,5,6
All
All
All
All
All
All
All
All
All
100
1500
5.0
1200
-1500
4.0
4.0
600
10
10
ms
mVpk
TT
LINE
ms
VTon
OS
Ton
D
Tr
LF
mVpk
ms
ms
Load fault recovery
12
Notes to Specifications
1 Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±0.1% of V
OUT
at 50 % 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 16V dc input, derate output power by 33 %.
5 Input step transition time between 2.0µs and 10µs.
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 2.0µs and 10µs.
8 Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz.
9 Tested at each output.
10 When operating with unbalanced loads, at least 25 % 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.
www.irf.com
5
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