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AHP27005SWES Datasheet(PDF) 6 Page - International Rectifier |
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AHP27005SWES Datasheet(HTML) 6 Page - International Rectifier |
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6 / 12 page  6 www.irf.com AHP28XXS Series Figure III. Preferred Connection for Parallel Operation Synchronization of Multiple Converters Parallel Operation-Current and Stress Sharing When operating multiple converters, system requirements often dictate operation of the converters at a common frequency. To accommodate this requirement, the AHP series converters provide both a synchronization input and a synchronization output. The sync input port permits synchronization of an AHP connverter to any compatible external frequency source operating 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 than 100 ns, maximum low level of +0.8 volts and a minimum high level of +2.0 volts. The sync output of another converter which has been designated as the master oscillator provides a convenient frequency source for this mode of operation. The sync output signal is a continuous pulse train set at 550 ±50 KHz, with a duty cycle of 15 ±5%. This signal is refer- enced to the input return and has been tailored to be com- patible with the AHP 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. Figure III. illustrates the preferred connection scheme for operation of a set of AHP 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 AHP. An important feature of AHP 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. 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. Optional Synchronization Connection Power Input (Other Converters) Share Bus 1 6 7 12 - Sense Enable 2 + Vout Return + Sense Share Vin Rtn Case Enable 1 Sync Out Sync In 1 67 12 - Sense Enable 2 + Vout Return + Sense Share Vin Rtn Case Enable 1 Sync Out Sync In 1 67 12 - Sense Enable 2 + Vout Return + Sense Share Vin Rtn Case Enable 1 Sync Out Sync In to Load AHP AHP AHP |
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