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PDF AHE28xxS Data sheet ( Hoja de datos )
| Número de pieza | AHE28xxS | |
| Descripción | ADVANCED ANALOG HYBRID-HIGH RELIABILITY DC/DC CONVERTERS | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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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
www.DataSheet4U.net
1
10/28/02
1 page  
AHE28XXS Series
AHE28XXS Block Diagram
1
+Input
2
E n a ble
9
Sync
Input
R e tu rn
10
EMI
F ilte r
Drive 1
Pulse W idth
M odulator FB
Drive 2
E rror
Amp &
Ref
5 +Vout
4 Return
3 VADJ
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.
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.
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%
www.irf.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AHE28xxS.PDF ] | |
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