PD - 94554A
AHE28XXS SERIES
ADVANCED ANALOG
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS
Description
The AHE28XXS 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
single outputs to satisfy a wide range of requirements.
The circuit design incorporates a pulse width modu-
lated 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 re-
sponse for superior line and load transient character-
istics and offers greater reliability and radiation toler-
ance than devices incorporating optical feedback cir-
cuits.
Three standard temperature grades are offered with
screening options. Refer to Part Number section. They
can be provided in a standard plug-in package for PC
mounting or in a flanged package for more severe en-
vironments.
These converters are manufactured in a facility certi-
fied to MIL-PRF-38534. All processes used to manu-
facture these converters have been qualified to enable
Advanced Analog to deliver compliant devices.
Two screening grades are available to satisfy a wide
range of requirements. The CH grade converters are
fully compliant to MIL-PRF-38534 for class H. The HB
grade converters are processed to full class H screen-
ing but do not have class H element evaluation as re-
quired by MIL-PRF-38534. Both grades are fully tested
and operate over the full military temperature range
without derating of output power. Variations in electri-
cal, mechanical and screening can be accommodated.
28V Input, Single Output
AHE
Features
n
17 to 40 VDC Input Range (28 VDC Nominal)
n
5
V, 12V and 15V Outputs Available
n
Indefinite Short Circuit and Overload
Protection
3
n
17 W/in Power Density
n
15 and 20 Watts Output Power Models
n
Fast Loop Response for Superior Transient
Characteristics
n
Operating Temperature Range from -55°C to
+125°C Available
n
Popular Industry Standard Pin-Out
n
Resistance Seam Welded Case for Superior
Long Term Hermeticity
n
Efficiencies up to 84%
n
Shutdown from External Signal
n
Military Screening
n
325,000 hour MTBF at 85°C (AUC)
Extensive computer simulation using complex
modeling enables rapid design modification to
be provided. Contact Advanced Analog with spe-
cific requirements.
www.irf.com
1
10/28/02
AHE28XXS Series
Specifications
T
CASE
= -55°C to +85°C, V
IN
= +28V
±
5% unless otherwise specified
n
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Power Output
Soldering
1
Temperature Range
1
-0.5V to 50V
Internally limited, 17.5W typical for AHE2805S, 22.5W typical for AHE2812S and AHE2815S
300°C for 10 seconds
Operating -55°C to +125°C case
Storage -65°C to +135°C
AHE2805S
AHE2812S
AHE2815S
Parameter
Conditions
-55°C
≤
Tc
≤
+85°C
Vin = 28 Vdc ±5%,C
L
= 0
Unless otherwise specified
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
Static Characteristic
OUTPUT
Voltage
Current
Ripple
Accuracy
1
Power
REGULATION
Line
Load
INPUT
4
Voltage Range
Current
Ripple Current
Efficiency
Capacitive Load
Load fault power
4
dissipation
Isolation
Dynamic
Characteristic
Step Load Changes
Output
Transient
Recovery
2
V
IN
=17 to 40 VDC
I
OUT
=0 to Full Load
Full Load, DC to 1MHz
T
CASE
= 25°C, I
OUT
= 0
4.90
0.0
5.00
20
5.10
3000
60
5.05
±1.0
±1.0
40.0
18
35
50
11.76
0.0
12.00
30
12.24
1667
60
12.12
±1.0
±1.0
40.0
18
35
50
14.70
0.0
15.00
30
15.30
1333
60
15.15
±1.0
±1.0
40.0
18
35
50
VDC
mADC
mVp-p
VDC
W
%
%
VDC
mADC
mADC
mV p-p
%
µF
4.95
15
5.00
±0.5
±0.5
11.88
20
12.00
±0.5
±0.5
14.85
20
15.00
±0.5
±0.5
V
IN
= 17 to 40 VDC
I
OUT
= to Full Load
17.0
Inhibited
No Load
Full Load
T
CASE
= +25°C
Half Load to Full Load
No effect on performance
28.0
8
20
17.0
28.0
8
25
17.0
28.0
8
25
80
500
82
79
200
6
83
80
200
6
84
6
100
W
MΩ
Input to Output @ 500Vdc
100
100
50% Load 100% Load
No Load 50% Load
50% Load No Load
50% Load 100% Load
No Load 50% Load
50% Load No Load
±150
-300
+300
25
500
7
±200
-400
+400
25
500
7
±200
-400
+400
25
500
7
mVpk
mVpk
mVpk
µsec
µsec
msec
Step Line Changes
Output
Transient
2
Recovery
Turn-On
3
Overshoot Delay
Load Fault
4
Recovery
Weight
Input step 17 to 40VDC
Input step 40 to 17VDC
Input step 17 to 40VDC
Input step 40 to 17VDC
VIN = 17 to 40VDC
IOUT = 0 to Full load
VIN = 17 to 40VDC
Standard Package
Flange Package
+180
-600
400
400
0
8
8
55
58
500
14
14
+180
-600
400
400
300
8
8
55
58
600
14
14
+180
-600
400
400
300
8
8
500
14
14
55
58
mVpk
mVpk
µsec
µsec
mVpk
msec
msec
grams
grams
Notes to Specifications
1. Above +85°C case temperature, derate output power linearly to 0 and maximum input voltage linearly to 42V at 115°C case.
2. 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.
See typical waveforms.
3. Turn-on delay time measurement is for either an application of power at the input or a signal at the shutdown pin.
4. For operation at 16VDC, derate output power by 33%.
2
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AHE28XXS Series
Specifications
T
CASE
= -55°C to +105°C, V
IN
= +28V
±
5% unless otherwise specified
n
ABSOLUTE
5
MAXIMUM RATINGS
Input Voltage
Power Output
Soldering
1
Temperature Range
-0.5V to 50V
Internally limited, 17.5W typical for AHE2805S/ES, 22.5W typical for AHE2812S/ES and AHE2815S/ES
300°C for 10 seconds
Operating -55°C to +125°C case
Storage -65°C to +135°C
AHE2805S/ES
AHE2812S/ES
AHE2815S/ES
Parameter
Conditions
-55°C
≤
Tc
≤
+105°C
Vin = 28 Vdc ±5%,C
L
= 0
Unless otherwise specified
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
Static Characteristic
OUTPUT
Voltage
Current
Ripple
Accuracy
1
Power
REGULATION
Line
Load
INPUT
4
Voltage Range
Current
Ripple Current
Efficiency
Capacitive Load
Load fault power
4
dissipation
Isolation
Dynamic
Characteristic
Step Load Changes
Output
Transient
Recovery
2
V
IN
=17 to 40 VDC
I
OUT
=0 to Full Load
Full Load, DC to 1MHz
T
CASE
= 25°C, I
OUT
= 0
4.90
0.0
5.00
20
5.10
3000
60
5.05
11.76
0.0
12.00
30
12.24
1667
60
12.12
14.70
0.0
15.00
30
15.30
1333
60
15.15
VDC
mADC
mVp-p
VDC
W
%
%
VDC
mADC
mADC
mV p-p
%
µF
4.95
15
5.00
11.88
20
12.00
14.85
20
15.00
V
IN
= 17 to 40 VDC
I
OUT
= 0 to Full Load
17.0
Inhibited
No Load
Full Load
T
CASE
= +25°C
Half load to Full load
No effect on performance
±0.5
±0.5
28.0
8
20
78
500
82
±1.0
±1.0
40.0
18
35
50
17.0
±0.5
±0.5
28.0
8
25
79
200
83
±1.0
±1.0
40.0
18
35
50
17.0
±0.5
±0.5
28.0
8
25
80
200
84
±1.0
±1.0
40.0
18
35
50
6
Input to Output @ 500Vdc
100
100
6
100
6
W
MΩ
50% Load 100% Load
No Load 50% Load
50% Load No Load
50% Load 100% Load
No Load 50% Load
50% Load No Load
±150
-300
+300
25
500
7
±200
-400
+400
25
500
7
±200
-400
+400
25
500
7
mVpk
mVpk
mVpk
µsec
µsec
msec
Step Line Changes
Output
Transient
2
Recovery
TURN –ON
Overshoot
3
Delay
Load Fault Recovery
Weight
4
Input step 17 to 40VDC
Input step 40 to 17VDC
Input step 17 to 40VDC
Input step 40 to 17VDC
V
IN
= 17 to 40VDC
I
OUT
= 0 to Full Load
V
IN
= 17 to 40VDC
Standard Package
Flange Package
+180
-600
400
400
0
8
8
60
65
500
14
14
+180
-600
400
400
300
8
8
60
65
600
14
14
+180
-600
400
400
300
8
8
60
65
750
14
14
mVpk
mVpk
µsec
µsec
mVpk
msec
msec
grams
grams
Notes to Specifications
1.
2.
3.
4.
5.
Above +105°C case temperature, derate output power linearly to 0 at 125°C case.
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.
See typical waveforms.
Turn-on delay time measurement is for either an application of power at the input or a signal at the shutdown pin.
For operation at 16VDC, derate output power by 33%.
Above +85°C case temperature, derate maximum input voltage linearly to 33V at +125°C case.
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3
AHE28XXS Series
Specifications
n
ABSOLUTE
1
MAXIMUM RATINGS
Input Voltage
Power Output
Soldering
1
Temp Range
-0.5V to 50V
Internally limited, 17.5W typical for AHE2805S/HB&CH, 22.5W typical for AHE281XS/HB&CH
300°C for 10 seconds
Operating -55°C to +125°C case
Storage -65°C to +135°C
Conditions
-55°C
≤
Tc
≤
+125°C
Vin = 28 Vdc ±5%,C
L
= 0
Unless otherwise specified
Parameter
AHE2805S/HB&CH
AHE2812S/HB&CH
AHE2815S/HB&CH
Min
Static Characteristic
OUTPUT
Voltage
Current
Ripple
Accuracy
1
Power
REGULATION
Line
Load
INPUT
4
Voltage Range
Current
Ripple Current
Efficiency
Capacitive Load
Load fault power
5
dissipation
Isolation
Dynamic
Characteristic
Step Load Changes
Output T
C
=25°C
Transient
Recovery
2
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
V
IN
=17 to 40 VDC
I
OUT
=0 to Full Load
Full Load, DC to 1MHz
T
CASE
= 25°C, I
OUT
= 0
4.90
0.0
5.00
20
5.10
3000
60
5.05
11.76
0.0
12.00
30
12.24
1667
60
12.12
14.70
0.0
15.00
30
15.30
1333
60
15.15
VDC
mADC
mVp-p
VDC
W
mV
mV
VDC
mADC
mADC
mV p-p
%
µF
W
W
MΩ
4.95
15
5.00
11.88
20
12.00
14.85
20
15.00
V
IN
= 17 to 40 VDC
T
CASE
= 25°C
I
OUT
= 0 to Full Load
Inhibited
No Load
Full Load
T
CASE
= +25°C
No effect on performance
Short Circuit T
C
=25°C
Overload T
C
= 25°C
Input to Output @ 500Vdc
5
10
17.0
28.0
8
20
82
1000
50
40.0
18
35
50
50
17.0
28.0
8
25
83
1000
30
120
40.0
18
35
50
50
17.0
28.0
8
25
84
1000
35
150
40.0
18
35
50
80
500
80
200
4.5
6
80
200
4.5
6
4.5
6
100
100
100
50% Load 100% Load
No Load 50% Load
50% Load No Load
50% Load 100% Load
No Load 50% Load
50% Load No Load
Input step 17 to 40VDC
Input step 40 to 17VDC
Input step 17 to 40VDC
Input step 40 to 17VDC
V
IN
= 17 to 40VDC
I
OUT
= 0 to Full Load
V
IN
= 17 to 40VDC
Standard Package
Flange Package
±150
-300
+300
25
100
±300
-500
+500
70
200
5
+300
1000
800
800
550
10
10
±200
-400
+400
25
500
±300
-500
+500
70
1500
5
+500
-1500
800
800
600
10
10
±200
-400
+400
25
500
±300
-500
+500
70
1500
5
+500
-1500
800
800
500
10
10
55
58
mVpk
mVpk
mVpk
µsec
µsec
msec
mVpk
mVpk
µsec
µsec
mVpk
msec
msec
grams
grams
Step Line Changes
Output T
C
= 25°C
Transient
2
Recovery
TURN –ON
Overshoot
3
Delay
4
Load Fault Recovery
Weight
+180
-600
400
400
0
8
8
55
58
+180
-600
400
400
300
8
8
55
58
+180
-600
400
400
300
8
8
Notes to Specifications
1.
2.
3.
4.
5.
Above +125°C case temperature, derate output power linearly to 0 at 135°C case.
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.
See typical waveforms.
Turn-on delay time measurement is for either an application of power at the input or a signal at the shutdown pin.
For operation at 16VDC, derate output power by 33%.
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
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AHE28XXS Series
AHE28XXS Block Diagram
5 + V ou t
1
+ Inp u t
2
E n a ble
9
S ync
In p ut
R e tu rn
10
D rive 1
EMI
F ilter
4 R e tu rn
P u lse W id th
M o du lato r
FB
D rive 2
E rror
Amp &
Ref
3
V
ADJ
Application Information
Inhibit Function
Connecting the inhibit input (Pin 2) to input common (Pin 10)
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 400µA of current. The open cir-
cuit voltage of the inhibit input is 11.5 ±1 VDC.
Output Voltage Adjustment (AHE2805 only)
The output voltage of the AHE2805S converter can be
adjusted upward by connecting an appropriate resistor
between Output Adjust (Pin 3) and Output Common
(Pin 4) as shown in Table 1 below.
Table 1 Output adjustment resistor values
Resistance Pin 3 to 4 (Ω)
None
390K
145K
63K
22K
0
Output Voltage Increases (%)
0
+1%
+2%
+3%
+4%
+5%
EMI Filter
An EMI filter (AFC461), available as an option, will reduce
the input ripple current to levels below the limits imposed by
MIL-STD-461B CEO.
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5
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