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TPS24750RUV Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS24750RUV Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 42 page T FLT 10 A C = t 1.35 V ´ TPS24750 TPS24751 SLVSC87 – OCTOBER 2013 www.ti.com TIMER: A capacitor CT connected from the TIMER pin to GND determines the overload fault timing. TIMER sources 10 µA when an overload is present, and discharges CT at 10 µA otherwise. Internal FET is turned off when VTIMER reaches 1.35 V. In an application implementing auto-retry after a fault, this capacitor also determines the period before the internal FET is re-enabled. A minimum timing capacitance of 1 nF is recommended to ensure proper operation of the fault timer. The value of CT can be calculated from the desired fault time tFLT, using Equation 4. (4) Either latch mode (TPS24750, TPS24752) or retry mode (TPS24751, TPS24753) occurs if the load current exceeds the current limit threshold or the fast trip shutdown threshold. While in latch mode, the TIMER pin continues to periodically charge and discharge the attached capacitor. In retry mode, the internal MOSFET is disabled for sixteen cycles of TIMER charging and discharging. The TIMER pin is pulled to GND by a 2 mA current source at the end of the 16th cycle of charging and discharging. The internal MOSFET is then re-enabled. The TIMER pin capacitor, CT, can also be discharged to GND during latch mode or retry mode in the following way: • A 2-mA current sinks TIMER whenever any of the following occurs: – VEN is below its falling threshold. – VVCC drops below the UVLO threshold. – VOV is above its rising threshold. TIMER is not affected when the die temperature exceeds the OTSD threshold. VCC: This pin performs three functions. First, it provides biasing power to the integrated circuit. Second, it serves as an input to the power-on reset (POR) and undervoltage lockout (UVLO) functions. Bypass capacitor C1, shown in the typical application diagram on the front page, should be connected to the positive terminal of VVCC. A capacitance of at least 10 nF is recommended. 10 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: TPS24750 TPS24751 |
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