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AFL2815SWCH Datasheet(PDF) 6 Page - International Rectifier |
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AFL2815SWCH Datasheet(HTML) 6 Page - International Rectifier |
6 / 16 page 6 www.irf.com AFL270XXS Series 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 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 ±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 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. 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 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 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 temperture, the current it pro- vides to the load will be reduced as compensation for the temperature induced stress on that device. 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. 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 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 save for minor differences in idle current. (See specification table). Synchronization of Multiple Converters Parallel Operation-Current and Stress Sharing |
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