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TPS2069D Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS2069D Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 23 page 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. |
Numéro de pièce similaire - TPS2069D |
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Description similaire - TPS2069D |
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