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International Rectifier Electronic Components Datasheet



AHE28xxS

ADVANCED ANALOG HYBRID-HIGH RELIABILITY DC/DC CONVERTERS


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AHE28xxS pdf
PD - 94554A
ADVANCED ANALOG
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS
AHE28XXS SERIES
28V Input, Single Output
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.
AHE
Features
n 17 to 40 VDC Input Range (28 VDC Nominal)
n 5V, 12V and 15V Outputs Available
n Indefinite Short Circuit and Overload
Protection
n 17 W/in3 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
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1
10/28/02



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AHE28xxS pdf
AHE28XXS Series
Specifications
TCASE = -55°C to +85°C,
V = +28V ± 5% unless otherwise specified
IN
n ABSOLUTE MAXIMUM RATINGS
Input Voltage1
-0.5V to 50V
Power Output
Internally limited, 17.5W typical for AHE2805S, 22.5W typical for AHE2812S and AHE2815S
Soldering
300°C for 10 seconds
Temperature Range1 Operating -55°C to +125°C case
Storage -65°C to +135°C
Parameter
Conditions
-55°C Tc +85°C
Vin = 28 Vdc ±5%,CL = 0
Unless otherwise specified
Static Characteristic
OUTPUT
Voltage
Current
Ripple
Accuracy
Power1
REGULATION
Line
Load
INPUT
Voltage Range4
Current
Ripple Current
Efficiency
Capacitive Load
Load fault power
dissipation4
Isolation
Dynamic
Characteristic
Step Load Changes
Output
Transient
Recovery2
Step Line Changes
Output
Transient
Recovery2
Turn-On
Overshoot Delay3
Load Fault
Recovery4
Weight
VIN=17 to 40 VDC
IOUT=0 to Full Load
Full Load, DC to 1MHz
TCASE = 25°C, IOUT = 0
VIN = 17 to 40 VDC
IOUT = to Full Load
Inhibited
No Load
Full Load
TCASE = +25°C
Half Load to Full Load
No effect on performance
Input to Output @ 500Vdc
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
VIN = 17 to 40VDC
IOUT = 0 to Full load
VIN = 17 to 40VDC
Standard Package
Flange Package
AHE2805S
AHE2812S
AHE2815S
Min Typ Max Min Typ Max Min Typ Max Units
4.90
0.0
4.95
15
17.0
80
500
100
5.00
20
5.00
±0.5
±0.5
28.0
8
20
82
5.10
3000
60
5.05
±1.0
±1.0
40.0
18
35
50
6
11.76
0.0
11.88
20
17.0
79
200
100
12.00
30
12.00
±0.5
±0.5
28.0
8
25
83
12.24
1667
60
12.12
±1.0
±1.0
40.0
18
35
50
6
14.70
0.0
14.85
20
17.0
80
200
100
15.00
30
15.00
±0.5
±0.5
28.0
8
25
84
15.30
1333
60
15.15
±1.0
±1.0
40.0
18
35
50
6
VDC
mADC
mVp-p
VDC
W
%
%
VDC
mADC
mADC
mV p-p
%
µF
W
M
±150
-300
+300
25
500
7
+180
-600
400
400
0
8
8
55
58
500
14
14
±200
-400
+400
25
500
7
+180
-600
400
400
300
8
8
55
58
600
14
14
±200
-400
+400
25
500
7
+180
-600
400
400
300
8
8
mVpk
mVpk
mVpk
µsec
µsec
msec
mVpk
mVpk
µsec
µsec
500 mVpk
14 msec
14 msec
55 grams
58 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 VOUT has returned to within ±1% of VOUT 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 www.irf.com



Part Number AHE28xxS
Description ADVANCED ANALOG HYBRID-HIGH RELIABILITY DC/DC CONVERTERS
Maker International Rectifier - International Rectifier
Total Page 8 Pages
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