AHP27005S Datasheet PDF - International Rectifier
| Part Number | AHP27005S | |
| Description | HYBRID - HIGH RELIABILITY DC/DC CONVERTER | |
| Manufacturers | International Rectifier | |
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PD-97181C
HYBRID - HIGH RELIABILITY
DC/DC CONVERTER
AHP270XXS SERIES
270V Input, Single Output
Description
The AHP Series of DC/DC converters feature high power
density without derating over the full military temperature
range. This series is offered as lower cost alternatives to
the legendary AFL series with improved performance for
new design applications. The AHPs are form, fit and
functional replacement to the AFL series. The new AHP
series offers a full compliment of single and dual output
voltages operating from nominal +28V or +270V inputs
with output power ranging from 66W to 120W. For
applications requiring higher output power, multiple
converters can be operated in parallel. The internal current
sharing circuits assure equal current distribution among
the paralleled converters. Same as the AFL, the AHP
series incorporates International Rectifier’s proprietary
magnetic pulse feedback technology providing optimum
dynamic line and load regulation response. This feedback
system samples the output voltage at the pulse width
modulator fixed clock frequency, nominally 550KHz.
Multiple converters can be synchronized to a system clock
in the 500KHz to 700KHz range or to the synchronization
output of one converter. Undervoltage lockout, primary
and secondary referenced inhibit, soft-start and load fault
protection are provided on all models. Also included is
input over-voltage protection, a new protection feature
unique to the AHP.
These converters are hermetically packaged in two
enclosure variations, utilizing copper core pins to minimize
resistive DC losses. Three lead styles are available, each
fabricated with International Rectifier’s rugged ceramic
lead-to-package seal assuring long term hermeticity in
the most harsh 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. Contact IR Santa Clara for special
requirements.
AHP
Features
n 160V To 400V Input Range
n 3.3V, 5V, 6V, 9V, 12V, 15V, 25V and 28V Outputs
n
Available
High Power
Density
-
up
to
84W/in3
n Up To 120W Output Power
n Parallel Operation with Stress and Current Sharing
n Low Profile (0.380") Seam Welded Package
n Ceramic Feed thru Copper Core Pins
n High Efficiency - to 87%
n Full Military Temperature Range
n Continuous Short Circuit and Overload Protection
n Remote Sensing Terminals
n Primary and Secondary Referenced
Inhibit Functions
n Line Rejection > 60dB - DC to 50KHz
n External Synchronization Port
n Fault Tolerant Design
n Dual Output Versions Available
n Standard Microcircuit Drawing Available
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1
01/16/07
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+ INPUT 1
INPUT
FILTER
Circuit Description
Figure I. Single Output Block Diagram
AHP270XXS Series
ENABLE 1 4
SYNC OUTPUT 5
SYNC INPUT 6
CASE 3
INPUT RETURN 2
PRIMARY
BIAS SUPPLY
CONTROL
OUTPUT
FILTER
ERROR
AMP
& REF
CURRENT
SENSE
SHARE
AMPLIFIER
SENSE
AMPLIFIER
7 + OUTPUT
10 + SENSE
11 SHARE
12 ENABLE 2
9 SENSE RETURN
8 OUTPUT RETURN
Circuit Operation and Application Information
The AHP series of converters employ a forward switched
mode converter topology. (refer to Figure I.) Operation of
the device is initiated when a DC voltage whose magnitude
is within the specified input limits is applied between pins 1
and 2. If pin 4 is enabled (at a logical 1 or open) the primary
bias supply will begin generating a regulated housekeeping
voltage bringing the circuitry on the primary side of the
converter to life. Two power MOSFETs used to chop the
DC input voltage into a high frequency square wave, apply
this chopped voltage to the power transformer. As this
switching is initiated, a voltage is impressed on a second
winding of the power transformer which is then rectified and
applied to the primary bias supply. When this occurs, the
input voltage is shut out and the primary bias voltage
becomes exclusively internally generated.
The switched voltage impressed on the secondary output
transformer winding is rectified and filtered to provide the
converter output voltage. An error amplifier on the secondary
side compares the output voltage to a precision reference
and generates an error signal proportional to the difference.
This error signal is magnetically coupled through the
feedback transformer into the controller section of the
converter varying the pulse width of the square wave signal
driving the MOSFETs, narrowing the width if the output
voltage is too high and widening it if it is too low.
Remote Sensing
Connection of the + and - sense leads at a remotely located
load permits compensation for resistive voltage drop between
the converter output and the load when they are physically
separated by a significant distance. This connection allows
regulation to the placard voltage at the point of application.
When the remote sensing feature is not used, the sense
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leads should be connected to their respective output
terminals at the converter. Figure III. illustrates a typical
application.
Inhibiting Converter Output
As an alternative to application and removal of the DC
voltage to the input, the user can control the converter
output by providing TTL compatible, positive logic signals
to either of two enable pins (pin 4 or 12). The distinction
between these two signal ports is that enable 1 (pin 4) is
referenced to the input return (pin 2) while enable 2 (pin 12)
is referenced to the output return (pin 8). Thus, the user
has access to an inhibit function on either side of the isolation
barrier. Each port is internally pulled “high” so that when
not used, an open connection on both enable pins permits
normal converter operation. When their use is desired, a
logical “low” on either port will shut the converter down.
Figure II. Enable Input Equivalent Circuit
+5.6V
Pin 4 or
Pin 12
1N4148
100K
290K
Disable
2N3904
Pin 2 or
Pin 8
150K
5
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| Information | Total 12 Pages | |
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Featured Datasheets
| Part Number | Description | MFRS |
| AHP27005S | The function is HYBRID - HIGH RELIABILITY DC/DC CONVERTER. International Rectifier | |
| AHP27005S | The function is HYBRID - HIGH RELIABILITY DC/DC CONVERTER. International Rectifier | |
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