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TPS2561DRCR Datasheet(PDF) 10 Page - Texas Instruments |
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TPS2561DRCR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page Charge Pump Driver UVLO Current Limit Thermal Sense 9-ms Deglitch IN GND EN1 ILIM OUT1 FAULT1 CS Current Sense CS EN2 OUT2 Thermal Sense 9-ms Deglitch FAULT2 Current Sense 10 TPS2560, TPS2561 SLVS930B – DECEMBER 2009 – REVISED DECEMBER 2015 www.ti.com Product Folder Links: TPS2560 TPS2561 Submit Documentation Feedback Copyright © 2009–2015, Texas Instruments Incorporated 9 Detailed Description 9.1 Overview The TPS256x is a dual-channel, current-limited power-distribution switch using N-channel MOSFETs for applications where short circuits or heavy capacitive loads will be encountered. This device allows the user to program the current-limit threshold between 250 mA and 2.8 A (typ) per channel via an external resistor. This device incorporates an internal charge pump and gate drive circuitry necessary to drive the N-channel MOSFETs. The charge pump supplies power to the driver circuit for each channel and provides the necessary voltage to pull the gate of the MOSFET above the source. The charge pump operates from input voltages as low as 2.5 V and requires little supply current. The driver controls the gate voltage of the power switch. The driver incorporates circuitry that controls the rise and fall times of the output voltage to limit large current and voltage surges and provides built-in soft-start functionality. Each channel of the TPS256x limits the output current to the programmed current-limit threshold IOS during an overcurrent or short-circuit event by reducing the charge pump voltage driving the N-channel MOSFET and operating it in the linear range of operation. The result of limiting the output current to IOS reduces the output voltage at OUTx because the N-channel MOSFET is no longer fully enhanced. 9.2 Functional Block Diagram 9.3 Feature Description 9.3.1 Overcurrent Conditions The TPS256x responds to overcurrent conditions by limiting the output current per channel to IOS. When an overcurrent condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. Two possible overload conditions can occur. The first condition is when a short circuit or partial short circuit is present when the device is powered-up or enabled. The output voltage is held near zero potential with respect to ground and the TPS256x ramps the output current to IOS. The TPS256x devices will limit the current to IOS until the overload condition is removed or the device begins to thermal cycle. |
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