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TLV70236DSER Datasheet(PDF) 11 Page - Texas Instruments |
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TLV70236DSER Datasheet(HTML) 11 Page - Texas Instruments |
11 / 33 page t = (120 R ) (120+R ) L L · · C OUT Thermal Shutdown Current Limit UVLO Bandgap IN EN OUT LOGIC GND TLV702xxPSeries 120W TLV702 www.ti.com SLVSAG6C – SEPTEMBER 2010 – REVISED MARCH 2015 Functional Block Diagrams (continued) Figure 24. TLV702P Block Diagram 7.3 Feature Description 7.3.1 Internal Current Limit The TLV702 internal current limit helps to protect the regulator during fault conditions. During current limit, the output sources a fixed amount of current that is largely independent of the output voltage. In such a case, the output voltage is not regulated, and is VOUT = ICL × RLOAD. The PMOS pass transistor dissipates (VIN – VOUT) × ICL until thermal shutdown is triggered and the device turns off. As the device cools, it is turned on by the internal thermal shutdown circuit. If the fault condition continues, the device cycles between current limit and thermal shutdown. See Thermal Consideration for more details. The PMOS pass element in the TLV702 has a built-in body diode that conducts current when the voltage at OUT exceeds the voltage at IN. This current is not limited, so if extended reverse voltage operation is anticipated, external limiting to 5% of the rated output current is recommended. 7.3.2 Shutdown The enable pin (EN) is active high. The device is enabled when voltage at EN pin goes above 0.9 V. The device is turned off when the EN pin is held at less than 0.4 V. When shutdown capability is not required, EN can be connected to the IN pin. The TLV702P version has internal active pulldown circuitry that discharges the output with a time constant of: where: • RL = Load resistance • COUT = Output capacitor (1) Copyright © 2010–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TLV702 |
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