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PDF AHP2828S Data sheet ( Hoja de datos )
| Número de pieza | AHP2828S | |
| Descripción | HIGH RELIABILITY HYBRID DC/DC CONVERTERS | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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PD-97388
HIGH RELIABILITY
HYBRID DC/DC CONVERTERS
AHP28XXS SERIES
28V 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
AHP
voltages operating from nominal +28 or +270 volt inputs
with output power ranging from 66 to 120 watts. For Features
applications requiring higher output power, multiple
converters can be operated in parallel. The internal n 16 To 40 Volt Input Range
current sharing circuits assure equal current distribution
among the paralleled converters. Same as the AFL, the
n
n
3.3, 5, 8, 9,12,15 and
High Power Density -
2u8pVtoolt8s4OWutp/ uints3
Available
AHP series incorporates International Rectifier's n Up To 120 Watt Output Power
proprietary magnetic pulse feedback technology n Parallel Operation with Stress and Current Sharing
providing optimum dynamic line and load regulation n Input Over-Voltage Protection
response. This feedback system samples the output nwww.DataSheet.co.kr High Efficiency - to 85%
voltage at the pulse width modulator fixed clock n Continuous Short Circuit and Overload Protection
frequency; nominally 550 KHz. Multiple converters can n External Synchronization Port
be synchronized to a system clock in the 500 KHz to 700 n Remote Sensing Terminals
KHz range or to the synchronization output of one n Primary and Secondary Referenced
converter. Under-voltage lockout, primary and secondary
Inhibit Functions
referenced inhibit, soft-start and load fault protection are n Line Rejection > 40 dB - DC to 50KHz
provided on all models. Also included is input over- n Fault Tolerant Design
voltage protection, a new protection feature unique to n Full Military Temperature Range
the AHP.
n Ceramic Feedthru Copper Core Pins
n Low Profile (0.380") Seam Welded Package
These converters are hermetically packaged in two n Dual Output Versions Available
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 harsh environments.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are available in four screening
grades to satisfy a wide range of requirements. The
CH grade is fully compliant to the requirements of MIL-
PRF-38534 for class H. The HB grade is fully processed
and screened to the class H requirement, but does not
have material element evaluated to the class H
requirement. Both grades are tested to meet the
www.irf.com
complete group “A” test specification over the full
military temperature range without output power
de-rating. Two grades with more limited screening
are also available for use in less demanding
applications. Variations in electrical, mechanical
and screening can be accommodated. Please
contact IR Santa Clara for special requirements.
1
04/16/09
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
AHP28XXS Circuit Description
Figure I. AHP Single Output Block Diagram
AHP28XXS Series
DC Input 1
Enable 1 4
Input
Filter
Primary
Bias Supply
Sync Output 5
Sync Input 6
Case 3
Input Return 2
Control
FB
Error
Amp
& Ref
Output
Filter
Current
Sense
Share
Amplifier
Sense
Amplifier
7 +Output
10 +Sense
11 Share
12 Enable 2
9 -Sense
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. A power MOSFET is used to chop the DC
input voltage into a high frequency square wave, applying
this chopped voltage to the power transformer at the nominal
converter switching frequency. Maintaining a DC voltage
within the specified operating range at the input assures
continuous generation of the primary bias voltage.
The switched voltage impressed on the secondary output
transformer winding is rectified and filtered to generate the
converter DC 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 MOSFET, narrowing the width if the output voltage
is too high and widening it if it is too low, thereby regulating
the output voltage.
Remote Sensing
Connection of the + and - sense leads at a remotely located
load permits compensation for excessive resistance
between the converter output and the load when their
physical separation could cause undesirable voltage drop.
This connection allows regulation to the placard voltage at
the point of application. When the remote sensing feature is
not used the sense leads should be connected to their
respective output terminals at the converter. Figure III.
illustrates a typical remotely sensed 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
inhibitwww.DataSheet.co.kr 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
Pin 2 or
Pin 8
200K
Disable
2N3904
Internally, these ports differ slightly in their function. In use,
a low on Enable 1 completely shuts down all circuits in the
converter, while a low on Enable 2 shuts down the secondary
side while altering the controller duty cycle to near zero.
Externally, the use of either port is transparent save for
minor differences in standby current. (See specification table).
www.irf.com
5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
AHP28XXS Case Outlines
Case X
3.000
2.760
2.500
2.975 max
0.238 max
ø 0.128
1.260 1.500
0.250
1.000
Ref
0.220
0.050
0.200 Typ
Non-cum
Pin
ø 0.040
0.380
Max
AHP28XXS Series
Case W
Pin Variation of Case Y
0.250
1.000
0.050
2.800
0.220
0.525
Pin
ø 0.040
0.380
Max
0.42
0.25 typ
Case Y
www.DataSheet.co.kr
1.150
0.300
ø 0.140
0.050
1.750
2.500
2.975 max
0.238 max
0.250
1.500 1.750 2.00
1.000
Ref
0.375
0.220
0.200 Typ
Non-cum
Pin
ø 0.040
0.380
Max
Case Z
Pin Variation of Case Y
0.250
1.000
Ref
0.050
0.220
2.800
0.525
Pin
ø 0.040
0.36
0.380
Max
Tolerances, unless otherwise specified: .XX = ±0.010
.XXX = ±0.005
BERYLLIA WARNING: These converters are hermetically sealed; however they contain BeO substrates and should not be ground or subjected to any other
operations including exposure to acids, which may produce Beryllium dust or fumes containing Beryllium
www.irf.com
11
Datasheet pdf - http://www.DataSheet4U.net/
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