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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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TPS7A03 Datenblatt(PDF) 22 Page - Texas Instruments |
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TPS7A03 Datenblatt(HTML) 22 Page - Texas Instruments |
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22 / 43 page  22 TPS7A03 SBVS375B – JULY 2019 – REVISED APRIL 2020 www.ti.com Submit Documentation Feedback Copyright © 2019–2020, Texas Instruments Incorporated 7.4 Device Functional Modes 7.4.1 Device Functional Mode Comparison The Device Functional Mode Comparison table shows the conditions that lead to the different modes of operation. See the Electrical Characteristics table for parameter values. Table 1. Device Functional Mode Comparison OPERATING MODE PARAMETER VIN VEN IOUT TJ Normal operation VIN > VOUT(nom) + VDO and VIN > VIN(min) VEN > VEN(HI) IOUT < IOUT(max) TJ < TSD(shutdown) Dropout operation VIN(min) < VIN < VOUT(nom) + VDO VEN > VEN(HI) IOUT < IOUT(max) TJ < TSD(shutdown) Disabled (any true condition disables the device) VIN < VUVLO VEN < VEN(LOW) Not applicable TJ > TSD(shutdown) 7.4.2 Normal Operation The device regulates to the nominal output voltage when the following conditions are met: • 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 the thermal shutdown temperature (TJ < TSD) • The enable voltage has previously exceeded the enable rising threshold voltage and has not yet decreased to less than the enable falling threshold 7.4.3 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 transistor is in the ohmic or triode region, and acts as a switch. Line or load transients in dropout can result in large output-voltage deviations. When the device is in a steady dropout state (defined as when the device is in dropout, VIN < VOUT(NOM) + VDO, directly after being in a normal regulation state, but not during startup), the pass transistor is driven into the ohmic or triode region. When the input voltage returns to a value greater than or equal to the nominal output voltage plus the dropout voltage (VOUT(NOM) + VDO), the output voltage can overshoot for a short period of time while the device pulls the pass transistor back into the linear region. 7.4.4 Disabled The output of the device can be shutdown by forcing the voltage of the enable pin to less than the maximum EN pin low-level input voltage (see the Electrical Characteristics table). When disabled, the pass transistor is turned off, internal circuits are shutdown, and the output voltage is actively discharged to ground by an internal discharge circuit from the output to ground. |
Ähnliche Teilenummer - TPS7A03_V06 |
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Ähnliche Beschreibung - TPS7A03_V06 |
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