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XRP2527IHBTR-1-F Datasheet(PDF) 9 Page - Exar Corporation |
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XRP2527IHBTR-1-F Datasheet(HTML) 9 Page - Exar Corporation |
9 / 13 page X XR RP P2 25 52 27 7 -- X XR RP P2 25 52 28 8 S Siin ng glle e/ /D Du ua all C Ch ha an nn ne ell A Ad djju us stta ab blle e C Cu urrrre en ntt P Po ow we err D Diis sttrriib bu uttiio on n S Sw wiittcch h © 2011 Exar Corporation 9/13 Rev. 1.1.0 Fig. 28: Current Limit Operation (XRP2527): VIN=5V, Rload = 10Ω, RSET = 330kΩ THEORY OF OPERATION The XRP2527 and XRP2528 devices are respectively single and dual channel integrated high-side power distribution switches with programmable current limit threshold feature. They can be used in any self or bus powered USB applications and are compliant with the latest USB 3.0 specifications. The reverse current protection feature prevents current to flow from OUT to IN when the device is disabled. INPUT & OUTPUT Placing bulk capacitances of at least 47μF and 10μF at the input and output pins respectively reduces power supply transients under heavy current load conditions. It is important to place a 1μF ceramic bypass capacitor from IN to GND as close as possible to the device in order to control supply transients. Furthermore, bypassing the output pin with a 0.1μF to 1μF ceramic capacitor improves the device response to short-circuit transients. ERROR FLAG The error flag signal (FLGX output pin) is an open-drain output and is pulled low (active low) upon detection of the following conditions: Over-current condition Over-temperature condition Under voltage lockout condition Over-temperature and under voltage lockout conditions are flagged immediately while the output over – current condition is reported if continuously persistent for longer than the blanking time of 10ms. The blanking time prevents erroneous reporting of current faults due to brief output current spikes. Once activated, the error flag signal remains low until all fault conditions have been removed and is independent for each individual channel. CURRENT LIMIT The current limit feature protects the output MOSFET switches from damages resulting from undesirable short circuit conditions or excess inrush current, which is often encountered during hot plug-in. Upon detection of overcurrent condition, the output current is limited to a constant current limit threshold value and the output voltage is reduced accordingly. Triggering the current limit function is signaled by the Error Flag after 10ms of blanking time period. The minimum current limit threshold can be programmed from 300mA to 1A set via an external resistor at the RSET pin. If RSET pin is left floating, then the device is set to USB 3.0 current limit setting. For USB 2.0 current limit setting, the RSET pin must be tied to VIN. The current limit threshold value is set using the resistor at RSET pin by the following equation: |
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