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AFL12028S Datasheet(PDF) 6 Page - International Rectifier |
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AFL12028S Datasheet(HTML) 6 Page - International Rectifier |
6 / 11 page 6 www.irf.com 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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