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ATW2805SCH-MSTR Datasheet(PDF) 8 Page - International Rectifier |
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ATW2805SCH-MSTR Datasheet(HTML) 8 Page - International Rectifier |
8 / 10 page 8 www.irf.com ATW28XXS 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 (Enable) 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 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 8) of the master device is connected to the synchronization input (pin 8) 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. See Part Number section. Typical Synchronization Connection Remote Sense (ATW2805S only) Better than 0.1% line and load regulation (case temperature constant) are typical when the remote sense leads are used. If the remote sense leads are left unconnected, then the output voltage (measured at pins 4 and 5) will rise to approximately 5.4VDC. If the remote sense leads are shorted together, the output voltage may rise above 10VDC depending on load, possibly damaging both the converter and load. Whenever multiple DC/DC converters are utilized in a single system, significant low frequency noise may be generated due to the sight differences 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). International Rectifier offers an option, which provides synchronization of multiple AHE/ATW type converters, thus eliminating this type of noise. ATW28xxD ATW28xxS AFC461 or AFV461 ATW28xxD 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 Output Output 5 4 +Vout Output Return Pulse Width Modulator EMI Filter 1 2 10 +Input Enable Input Input Return Error Amp & Ref -Sense FB Drive 1 Drive 2 8 Sync 6 +Sense 3 |
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