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LSO2801R5DEM Datasheet(PDF) 2 Page - International Rectifier |
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LSO2801R5DEM Datasheet(HTML) 2 Page - International Rectifier |
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2 / 18 page  2 www.irf.com LSO SERIES 28V Input, Single/Dual Output The LSO Series converters utilize a single-ended forward topology with resonant reset. The nominal switching frequency is 500KHz. 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. Circuit Description An internal EMI filter allows the converter to meet the conducted emissions requirements of MIL-STD- 461C on the input power leads. Inhibit (On/Off Command) : An external inhibit port is provided to control converter operation. The converter’s operation is inhibited when this pin is pulled low. It is intended to be driven by an open collector logic device. The pin may be left open for normal operation and has a nominal open circuit voltage of 4V with respect to the inhibit return (Pin 4). Short Circuit and Overload Protection: Output current is limited under any load fault condition to approximately 125% of rated. An overload condition causes the converter output voltage to drop 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. The current limit point exhibits a slightly negative temperature coefficient to reduce the possibility of thermal runaway. Input Undervoltage Lockout (UVLO) and Undervoltage Release (UVR): The converter is designed to be protected against an undervoltage condition. The converter will be in a non-functional (UVLO) mode when the input voltage is pproximately 15.5V or less. The converter will turn on when the input voltage rises to 15.5V to 17.9V (defined as UVR threshold) and will provide a regulated output as the input voltage reaches 18V. Should the input voltage drops below 16.5V to 14.5V (defined as UVLO threshold), the converter will turn off and remains off so long as the input voltage remains under the UVLO threshold. The converter will resume a normal operation when the input line rises above the UVR threshold. However, the converter can be configured to remain in a latch-up mode if desired. Functional Notes Input Current Telemetry: The LSO Series single and dual output models also feature an input current telemetry with a magnitude of 0 to 3.3V full scale. The voltage signal at this pin (Pin 7) with respect to Output Return (Pin 12) is equal to 1.5 times the input current (Vin TLM (V) =1.5 *Input Current (A)+/-0.1V) Output Overvoltage Protection : The converter also features an output over-voltage protection. One OVP circuitry for each output for the dual output models. In an event the voltage output exceeds a preset voltage threshold of approximately 120 +/- 5% of nominal voltage output, the converter will turn off. The input power to the converter or the signal at the Inhibit pin must be recycled (connecting and removing the Inhibit pin to/from Inhibit Return pin) to turn on the converter. This event is possible only if the converter shuts off due to a false triggering. The OVP threshold voltage can also be reset to within 115% to 125% of nominal output voltage with two external resistors. Refer to the Application Notes section of the data sheet on page 9. To take advantage of the latch-up feature, the U/V Latch Pin (Pin 5) should be shorted (with less than 100 ohms) to the Inhibit Return Pin (Pin 4). Note that in this mode the converter will latch off if an undervoltage condition lasts more than 1milli-sec. The converter is reset by a shorted Enable Input pin command followed by an open Enable Input pin command. Output Voltage Adjustment: The output voltage of all models can be adjusted greater or less than the nominal output voltage using a single external resistor. Refer to the Application Notes section of the data sheet on page 9. |
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