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ATW2805D Datasheet(PDF) 6 Page - International Rectifier |
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ATW2805D Datasheet(HTML) 6 Page - International Rectifier |
6 / 8 page 6 www.irf.com ATW28XXD Series Connecting the inhibit input (Pin 8) 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 cir- cuit voltage of the inhibit input is 11.5 ±1 VDC. ATW28XXD Block Diagram Application Information Inhibit Function EMI Filter An optional external EMI filter (AFC461) is available that will reduce the input ripple current to levels below the limits imposed by MIL-STD-461B 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 sys- tem is fail-safe; that is, the slaves will continue operating should the master frequency be interrupted for any rea- son. The layout must be such that the synchronization output (pin 2) of the master device is connected to the synchronization input (pin 2) of each slave device. It is advisable to keep this run short to minimize the possibil- ity of radiating the 250KHz switching frequency. The appropriate parts must be ordered to utilize this fea- ture. After selecting the converters required for the sys- tem, 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 Whenever multiple DC/DC converters are utilized in a single system, significant low frequency noise may be generated due to the slight 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). Advanced Analog offers an option, which allows synchroni- zation of multiple AHE/ATW type converters, thus eliminat- ing this type of noise. A T W 28xxD A T W 28xxS A F C 461 or AF V 4 6 1 A T W 28xxD or O ther C o m patab le + In + In + In Ca se Ca se Ca se Re turn Re turn Re turn Re turn Re turn Re turn Ou tp ut Ou tp ut Ou tp ut MS T R SLV SLV + In Re turn Ou tp ut Re turn Sy ste m Bu s Ou tp ut Ou tp ut 3 4 + V out Re tu rn P u ls e W idth M o d u la to r EM I Filte r 1 8 10 + In put E nable In put Re tu rn FB Drive 1 Drive 2 2 S y nc E rror A m p & R eference 5 -V out |
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