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TPS2069D Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS2069D
Description  Current Limited, Power-Distribution Switches
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS2069D Fiches technique(HTML) 11 Page - Texas Instruments

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background image
Charge
Pump
Driver
UVLO
Current
Limit
Thermal
Sense
9-ms
Deglitch
IN
GND
OUT
FLT
Current
Sense
(Disabled+
UVLO)
OTSD
CS
EN
Copyright © 2016, Texas Instruments Incorporated
11
TPS2069D
www.ti.com
SLVSDQ5 – DECEMBER 2016
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The TPS2069D are current limited, power-distribution switches providing 1.5 A of continuous load current in 5-V
circuits. These parts use N-channel MOSFETs for low resistance, maintaining voltage regulation to the load.
They are designed for applications where short circuits or heavy capacitive loads are encountered. Device
features include enable, reverse blocking when disabled, output discharge pulldown, overcurrent protection,
overtemperature protection, and deglitched fault reporting.
8.2 Functional Block Diagrams
Figure 20. Block Diagram
8.3 Feature Description
8.3.1 Undervoltage Lockout
The undervoltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO
turnon threshold. Built-in hysteresis prevents unwanted ON/OFF cycling due to input voltage drop from large
current surges. FLT is high impedance when the TPS2069D is in UVLO.
8.3.2 Enable
The logic enable input (EN), controls the power switch, bias for the charge pump, driver, and other circuits. The
supply current is reduced to less than 1 µA when the TPS2069D is disabled. Disabling the TPS2069D
immediately clears an active FLT indication. The enable input is compatible with both TTL and CMOS logic
levels.
The turnon and turnoff times (tON, tOFF) are composed of a delay and a rise or fall time (tR, tF). The delay times
are internally controlled. The rise time is controlled by the device and the external loading (especially
capacitance). TPS2069D fall time is controlled by the loading (R and C), and the output discharge (RPD). An
output load consisting of only a resistor will experience a fall time set by the device. An output load with parallel
R and C elements experiences a fall time determined by the (R × C) time constant if it is longer than the device
tF.
The enable should not be left open, and may be tied to VIN or GND depending on the device.


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