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 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).
level of +2.0 volts. The sync output of another converter
which has been designated as the master oscillator pro-
vides a convenient frequency source for this mode of op-
eration. When external synchronization is not required, the
sync in pin should be left open (unconnected )thereby per-
mitting the converter to operate at its’ own internally set
frequency.
Synchronization of Multiple Converters
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 connection is illustrated in Figure III.
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
100 ns, maximum low level of +0.8 volts and a minimum high
Figure III. Preferred Connection for Parallel Operation
1
12
Power
Input
Enable 2
Vin
Rtn
Share
Sense
Sense
Return
Case
Enable
+
-
AFL
AFL
1
Sync Out
Sync In
+
Vout
6
1
7
Optional
Synchronization
Connection
Share Bus
12
Enable
2
Vin
Rtn
Share
Sense
Sense
Return
Case
+
-
Enable
1
Sync Out
Sync In
to Load
+
Vout
7
6
1
12
Enable
2
Vin
Rtn
Share
Sense
Sense
Return
Case
+
-
AFL
Enable
1
Sync Out
Sync In
+
Vout
7
6
(Other Converters)
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
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
the temperature induced stress on that device.
6
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