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AFL50XXS Schematic ( PDF Datasheet ) - IRF

Teilenummer AFL50XXS
Beschreibung HYBRID-HIGH RELIABILITY DC/DC CONVERTER
Hersteller IRF
Logo IRF Logo 




Gesamt 12 Seiten
AFL50XXS Datasheet, Funktion
PD - 94457B
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
AFL50XXS SERIES
50V Input, Single Output
Description
The AFL Series of DC/DC converters feature high power
density with no derating over the full military temperature
range. This series is offered as part of a complete family
of converters providing single and dual output voltages
and operating from nominal +28V, +50V, +120V or +270V
inputs with output power ranging from 80W to 120W.
For applications requiring higher output power,
individual converters can be operated in parallel. The
internal current sharing circuits assure equal current
distribution among the paralleled converters. This 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 700
KHz 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.
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.
AFL
Features
n 30V To 80V Input Range
n
n
5HVig, h8VP,o9wV,e1r 2DVe, n1s5iVtya-nudp2t8oV8O4uWtp/uints3 Available
n Up To 120W Output Power
n Parallel Operation with Stress and Current
Sharing
n Low Profile (0.380") Seam Welded Package
n Ceramic Feedthru Copper Core Pins
n High Efficiency - to 85%
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 > 40dB - DC to 50KHz
n External Synchronization Port
n Fault Tolerant Design
n Dual Output Versions Available
n Standard Microcircuit Drawings Available
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AFL50XXS Datasheet, Funktion
AFL50XXS Series
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 to the user
save for minor differences in idle current. (See specification table).
Synchronization of Multiple Converters
When operating multiple converters, system requirements
often dictate operation of the converters at a common
frequency. To accommodate this requirement, the AFL
series converters provide both a synchronization input
and output.
The sync input port permits synchronization of an AFL
converter to any compatible external frequency source
oper- ating between 500KHz and 700KHz. This input signal
should be referenced to the input return and have a 10%
to 90% duty cycle. Compatibility requires transition times
less than 100ns, maximum low level of +0.8V and a minimum
high level of +2.0V. The sync output of another converter
which has been designated as the master oscillator provides
a convenient frequency source for this mode of operation.
When external synchronization is not required, the sync in
pin should be left open (unconnected )thereby permitting
the converter to operate at its’ own internally set frequency.
The sync output signal is a continuous pulse train set at
550 ± 50KHz, with a duty cycle of 15 ± 5.0%. This signal is
referenced to the input return and has been tailored to be
compatible with the AFL sync input port. Transition times
are less than 100ns and the low level output impedance is
less than 50. This signal is active when the DC input
voltage is within the specified operating range and the
converter is not inhibited. This output has adequate drive
reserve to synchronize at least five additional converters.
A typical connection is illustrated in Figure III.
Figure III. Preferred Connection for Parallel Operation
Power
Input
Optional
Synchronization
Connection
1
Vin
Rtn
Case
Enable 1
Sync Out
Sync In
6
AFL
Enable 2
Share
+ Sense
- Sense
Return
+ Vout
12
7
1
Vin
Rtn
Case
Enable 1
Sync Out
Sync In
6
AFL
Enable 2
Share
+ Sense
- Sense
Return
+ Vout
12
7
Share Bus
to Load
1
Vin
Rtn
Case
Enable 1
Sync Out
Sync In
6
AFL
Enable 2
Share
+ Sense
- Sense
Return
+ Vout
12
7
(Other Converters)
Parallel Operation-Current and Stress Sharing
Figure III. illustrates the preferred connection scheme for
operation of a set of AFL converters with outputs operating
in parallel. Use of this connection permits equal sharing
among the members of a set whose load current exceeds
the capacity of an individual AFL. An important feaure of the
AFL series operating in the parallel mode is that in addition
to sharing the current, the stress induced by temperature
will also be shared. Thus if one member of a paralleled set
is operating at a higher case temperature, the current it
provides to the load will be reduced as compensation for
the temperature induced stress on that device.
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AFL50XXS pdf, datenblatt
AFL50XXS Series
Device Screening
Requirement MIL-STD-883 Method No Suffix
ES d
HB
CH
Temperature Range
e-20°C to +85°C -55°C to +125°C -55°C to +125°C -55°C to +125°C
Element Evaluation
MIL-PRF-38534
N/A
N/A
N/A Class H
Non-Destructive
Bond Pull
Internal Visual
2023
2017
N/A N/A
c Yes
N/A N/A
Yes Yes
Temperature Cycle
1010
N/A
Cond B
Cond C
Cond C
Constant Acceleration
2001, Y1 Axis
N/A
500 Gs
3000 Gs
3000 Gs
PIND
2020
N/A N/A
N/A N/A
Burn-In
Final Electrical
1015
MIL-PRF-38534
N/A
25°C
48 hrs@hi temp 160 hrs@125°C 160 hrs@125°C
d25°C
-55°C, +25°C, -55°C, +25°C,
( Group A )
& Specification
+125°C
+125°C
PDA
MIL-PRF-38534
N/A
N/A
N/A 10%
Seal, Fine and Gross
1014
Cond A
Cond A, C
Cond A, C
Cond A, C
Radiographic
External Visual
2012
2009
N/A N/A
c Yes
N/A N/A
Yes Yes
Notes:
 Best commercial practice
‚ Sample tests at low and high temperatures
ƒ -55°C to +105°C for AHE, ATO, ATW
Part Numbering
AFL 50 05 S X /CH
Model
Input Voltage
Screening Level
(Please refer to Screening Table)
No suffix, ES, HB, CH
28 = 28V
50 = 50V
120 = 120V
270 = 270V
Case Style
W, X, Y, Z
Output
Output Voltage
S = Single
05 = 5V, 06 = 6V
07 = 7V, 08 = 8V
09 = 9V, 12 = 12V
15 = 15V, 28 = 28V
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331
IR SANTA CLARA: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 12/2006
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