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PDF AHE2812S Data sheet ( Hoja de datos )
| Número de pieza | AHE2812S | |
| Descripción | HYBRID-HIGH RELIABILITY DC/DC CONVERTER | |
| Fabricantes | IRF | |
| Logotipo |  |
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PD-94554B
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
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 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.
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
environments.
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. Extensive computer simulation using
complex modeling enables rapid design modification
to be provided. Contact IR Santa Clara with specific
requirements.
AHE28XXS SERIES
28V Input, Single Output
AHE
Features
n 17V to 40VDC Input Range (28VDC Nominal)
n 5V, 12V and 15V Outputs Available
n Indefinite Short Circuit and Overload Protection
n 17 W/in3 Power Density
n 15W and 20W 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)
n Standard Microcircuit Drawings Available
www.irf.com
1
01/08/07
http://www.Datasheet4U.com
1 page  
+Input
1
Inhibit
Input
2
Sync
9
Input
Return
10
EMI
Filter
Drive 1
Pulse Width
Modulator FB
Drive 2
Block Diagram
AHE28XXS Series
Error
Amp &
Ref
5 +Vout
4
Output
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
circuit voltage of the inhibit input is 11.5 ± 1.0VDC.
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 ( )
None
390K
145K
63K
22K
0
Output Voltage Increases (%)
0
+1%
+2%
+3%
+4%
+5%
Device Synchronization
Whenever multiple DC/DC converters are utilized in a
single system, significant low frequency noise may be
generated due to slight difference in the switching
frequencies of the converters (beat frequency noise).
Because of the low frequency nature of this noise
(typically less than 10KHz), it is difficult to filter out and
may interfere with proper operation of sensitive systems
(communications, radar or telemetry). Intenational
Rectifier offers an option, which provides synchronization
of multiple AHE/ATW/ATO type converters, thus
eliminating this type of noise.
Typical Synchronization Connection
+ In
Return
AFC461
or
AFV461
Output
Return
+ In Output
Case
AHE28xxS
- MSTR
Return
Return
MSTR
System
Bus
+ In +Output
Case
AHE28xxD
-SLV
Return
Return
-Output
SLV
+ In
Output
AHE28xxS
Case -SLV
Return
Return
SLV
www.irf.com
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AHE2812S.PDF ] | |
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