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AHE2815D Datasheet(PDF) 8 Page - International Rectifier |
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AHE2815D Datasheet(HTML) 8 Page - International Rectifier |
8 / 10 page 8 www.irf.com AHE28XXD Series Connecting the inhibit input (Pin 2) to input common (Pin 10) will cause the converter to shut down. It is recommended that the inhibit pin be driven by an open collector device capable of sinking at least 400µA of current. The open circuit voltage of the inhibit input is 11.5 ± 1.0VDC. Block Diagram Application Information Inhibit Function EMI Filter An optional EMI filter (AFC461) will reduce the input ripple current to levels below the limits imposed by MIL-STD-461 CEO3. Device Synchronization Whenever multiple DC/DC converters are utilized in a single system, significant low frequency noise may be generated due to slight difference in the switching frequencies of the converters (beat frequency noise). Because of the low frequency nature of this noise (typically less than 10KHz), it is difficult to filter out and may interfere with proper operation of sensitive systems (communications, radar or telemetry). To take advantage of this capability, the system designer must assign one of the converters as the master. Then, by definition, the remaining converters become slaves and will operate at the masters’ switching frequency. The user should be aware that the synchronization system is fail-safe; that is, the slaves will continue operating should the master frequency be interrupted for any reason. The layout must be such that the synchronization output (pin 9) of the master device is connected to the synchronization input (pin 9) of each slave device. It is advisable to keep this run short to minimize the possibility of radiating the 250KHz switching frequency. The appropriate parts must be ordered to utilize this feature. After selecting the converters required for the system, a ‘MSTR’ suffix is added for the master converter part number and a ‘SLV’ suffix is added for slave part number. International Rectifier offers an option that provides synchronization of multiple AHE/ATW converters, thus eliminating this type of noise. Typical Synchronization Connection AHE28xxS AHE28xxS AFC461 or AFV461 AHE28xxS or Other Compatable + In + In + In Case Case Case Return Return Return Return Return Return Output Output Output MSTR SLV SLV + In Return Output Return System Bus 3 4 +Vout Pulse Width Modulator EMI Filter 1 2 10 +Input Input Return FB Drive 1 Drive 2 9 Sync 5 -Vout Regulator Output Return Inhibit Input Error Amp & Reference |
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