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AFL120XXS Datasheet(PDF) 6 Page - International Rectifier

No. de Pieza. AFL120XXS
Descripción  HIGH RELIABILITY HYBRID DC/DC CONVERTERS
Descarga  11 Pages
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Fabricante  IRF [International Rectifier]
Página de inicio  http://www.irf.com
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AFL120XXS Datasheet(HTML) 6 Page - International Rectifier

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AFL120XXS Series
Figure III. Preferred Connection for Parallel Operation
Optional
Synchronization
Connection
Power
Input
(Other Converters)
Share Bus
1
6
AFL
7
12
- Sense
Enable 2
+ Vout
Return
+ Sense
Share
Vin
Rtn
Case
Enable 1
S y nc Out
Sync In
1
6
AFL
7
12
- Sense
Enable 2
+ Vout
Return
+ Sense
Share
Vin
Rtn
Case
Enable 1
S y nc Out
Sync In
1
6
AFL
7
12
- Sense
Enable 2
+ Vout
Return
+ Sense
Share
Vin
Rtn
Case
Enable 1
S y nc Out
Sync In
to Load
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.
Synchronization of Multiple Converters
Parallel Operation-Current and Stress Sharing
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 second-
ary 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).
When operating multiple converters, system requirements
often dictate operation of the converters at a common fre-
quency. To accommodate this requirement, the AFL series
converters provide both a synchronization input and out-
put.
The sync input port permits synchronization of an AFL co-
nverter to any compatible external frequency source oper-
ating between 500 and 700 KHz. This input signal should
be referenced to the input return and have a 10% to 90%
duty cycle. Compatibility requires transition times less th an
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 of
a load current exceeding the capacity of an individual AFL
among the members of the set. An important feature of the
100 ns, maximum low level of +0.8 volts and a minimum
highlevel of +2.0 volts. The sync output of another con-
verter 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 unconnected thereby permit-
ting the converter to operate at its’ own internally set fre-
quency.
The sync output signal is a continuous pulse train set at
550 ±50 KHz, with a duty cycle of 15 ±5%. 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 100 ns and the low level output impedance is
less than 50 ohms. This signal is active when the DC input
voltage is within the specified operating range and the con-
verter is not inhibited. This output has adequate drive re-
serve to synchronize at least five additional converters. A
typical synchronization connection option is illustrated in
Figure III.


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