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TPS2561DRCR Datasheet(PDF) 10 Page - Texas Instruments

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No. de pieza TPS2561DRCR
Descripción Electrónicos  Dual Channel Precision Adjustable Current-limited Power Switches
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS2561DRCR Datasheet(HTML) 10 Page - Texas Instruments

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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
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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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