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S2805D Datasheet(PDF) 2 Page - International Rectifier |
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S2805D Datasheet(HTML) 2 Page - International Rectifier |
2 / 9 page 2 www.irf.com S-SERIES (28V Input, Single/Dual Output) Circuit Description Design Methodology The S-Series converters utilize a single-ended forward topology with resonant reset. The nominal switching frequency is 525KHz. Electrical isolation and tight output regulation are achieved through the use of a magnetically coupled feedback. Voltage feed-forward with duty factor limiting provides high line rejection. Output power is limited under any load fault condition to approximately 135% for singles and 145% for duals of rated. An overload condition causes the converter output to behave like a constant current source with the output voltage dropping below nominal. The converter will resume normal operation when the load current is reduced below the current limit point. This protects the converter from both overload and short circuit conditions. There are no latching elements included in the load fault protection circuits to eliminate the possibility of falsely triggering the protection circuits during single event radiation exposure. An under-voltage protection circuit prohibits the converter from operating when the line voltage is too low for safe operation. The converter will not start until the line voltage rises to approximately 12V. An external enable port is provided to control converter operation. This input is intended for operation with an open collector transistor drive or a relay closure to the input return. The pin may be left open for normal operation and has a nominal open circuit voltage of 10.5V. The S-Series was developed using a proven conservative design methodology, which includes selecting radiation tolerant, and established reliability components and fully derating to the requirements of MIL-STD-975 and MIL-STD-1547 except for the CDR type of capacitors, a capacitor with 50V rating is used for in-circuit voltage stress of less than10V. Heavy derating of the radiation- hardened power MOSFET virtually eliminates the possibility of SEGR and SEB. A magnetic feedback circuit is utilized instead of opto-couplers to minimize temperature, radiation and aging sensitivity. PSPICE was used extensively to predict and optimize circuit performance for both beginning and end-of- life. Thorough design analyses include Radiation Susceptibility (TREE), Worst Case, Stress, Thermal and Reliability (MTBF). |
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