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AFL5007SX Datasheet(PDF) 6 Page - International Rectifier |
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AFL5007SX Datasheet(HTML) 6 Page - International Rectifier |
6 / 12 page 6 www.irf.com AFL28XXS Series Figure III. Preferred Connection for Parallel Operation 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 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 stndby current. (See specification table). 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 a synchronization output. The sync input port permits synchronization of an AFL converter to any compatible external frequency source operating 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 +0.8Vand a minimum highvel 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%. 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 Ω. 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. 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 feature of 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 Sync Out Sync In 1 6 AFL 7 12 - Sense Enable 2 + Vout Return + Sense Share Vin Rtn Case Enable 1 Sync Out Sync In 1 6 AFL 7 12 - Sense Enable 2 + Vout Return + Sense Share Vin Rtn Case Enable 1 Sync Out Sync In to Load 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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