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TPS71525DCKRG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS71525DCKRG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page TPS715 www.ti.com SLVS338R – MAY 2001 – REVISED APRIL 2015 Feature Description (continued) 7.3.4 Internal Current Limit The internal current limit circuit is used to protect the LDO against high-load current faults or shorting events. The LDO is not designed to operate in a steady-state current limit. During a current limit event, the LDO sources constant current. Therefore, the output voltage falls when load impedance decreases. NOTE if a current limit occurs and the resulting output voltage is low, excessive power is dissipated across the LDO, resulting in possible damage to the device. 7.3.5 Reverse Current The TPS715 PMOS-pass transistor has a built-in back diode that conducts current when the input voltage drops below the output voltage (for example, during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting may be required. 7.4 Device Functional Modes Table 1 provides a quick comparison between the normal, dropout, and disabled modes of operation. Table 1. Device Functional Mode Comparison PARAMETER OPERATING MODE VIN IOUT Normal VIN > VOUT(nom) + VDO IOUT < ICL Dropout VIN < VOUT(nom) + VDO IOUT < ICL Disabled — — 7.4.1 Normal Operation The device regulates to the nominal output voltage under the following conditions: • The input voltage is greater than the nominal output voltage plus the dropout voltage (VOUT(nom) + VDO). • The output current is less than the current limit (IOUT < ICL). • The device junction temperature is less than 125°C. 7.4.2 Dropout Operation If the input voltage is lower than the nominal output voltage plus the specified dropout voltage, but all other conditions are met for normal operation, the device operates in dropout mode. In this mode, the output voltage tracks the input voltage. During this mode, the transient performance of the device becomes significantly degraded because the pass device is in the linear region and no longer controls the current through the LDO. Line or load transients in dropout can result in large output-voltage deviations. Copyright © 2001–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS715 |
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