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TPS2491DGSG4 Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS2491DGSG4 Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 36 page A B A 2B V(DS) Detector Enable Constant Power Engine _ + 50mVmax Charge Pump 22 A m GateControl Amplifier 4V Reference 14V 2mA + − + − I(D) Detector _ + 9mS Deglitch Inrush Complete Power/Current Amplifier 25 A m Fault Logic _ + 4V and 1V 2.5 A m Timer For AutoretryOptionwith DutyCycleof0.75% _ + _ + UVLO Enable POR 8.4Vand 8.3V 1.35Vand 1.25V 10 VCC 3 PROG 9 SENSE 1 EN 5 GND 4 TIMER 6 PG 7 OUT 8 GATE 2 VREF 2.7Vand 1.25V Enable 10 TPS2490, TPS2491 SLVS503E – NOVEMBER 2003 – REVISED FEBRUARY 2017 www.ti.com Product Folder Links: TPS2490 TPS2491 Submit Documentation Feedback Copyright © 2003–2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The inline protection functionality of the TPS2490 is designed to control the inrush current to the load upon insertion of a circuit card into a live backplane or other hot power source, thereby limiting the voltage sag on the backplane's supply voltage and the dV/dt of the voltage applied to the load. Effects on other circuits in the system are minimized, preventing possible unintended resets. A controlled shutdown when the circuit card is removed can also be implemented using the TPS2490. In addition to a programmable current limit, the TPS2490 monitors and limits the maximum power dissipation in the series pass device to maintain operating within the device Safe Operating Area (SOA). Either current limiting or power limiting for an extended period of time results in the shutdown of the series pass device. In this event, the TPS2490 will latch off while the TPS2491 will retry an infinite number of timer to recover after the fault is removed. Programmable EN circuit shuts down the TPS2490 when the system input voltage falls below the desired operating range. 7.2 Functional Block Diagram |
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