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TLV75533PDQNT データシート(PDF) 10 Page - Texas Instruments |
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TLV75533PDQNT データシート(HTML) 10 Page - Texas Instruments |
10 / 30 page 10 TLV755P SBVS320 – NOVEMBER 2017 www.ti.com Product Folder Links: TLV755P Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated (1) All table conditions must be met. (2) The device is disabled when any condition is met. 7.4 Device Functional Modes Table 1 lists a comparison between the normal, dropout, and disabled modes of operation. Table 1. Device Functional Modes Comparison OPERATING MODE PARAMETER VIN EN IOUT TJ Normal(1) VIN > VOUT(NOM) + VDO VEN > VHI IOUT < ICL TJ < TSD Dropout(1) VIN < VOUT(NOM) + VDO VEN > VHI — TJ < TSD Disabled(2) VIN < VUVLO VEN < VLO — TJ > TSD 7.4.1 Normal Operation The device regulates to the nominal output voltage when all following conditions are met: • The input voltage is greater than the nominal output voltage plus the dropout voltage (VOUT(NOM) + VDO) • The enable voltage has previously exceeded the enable rising threshold voltage and has not decreased below the enable falling threshold • The output current is less than the current limit (IOUT < ICL) • The device junction temperature is less than the thermal shutdown temperature (TJ < TSD) 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. In this mode, the output voltage tracks the input voltage. During this mode, the transient performance of the device degrades because the pass device is in a triode state and no longer controls the current through the LDO. 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, right after being in a normal regulation state, but not during startup), the pass-FET is driven as hard as possible when the control loop is out of balance. During the normal time required for the device to regain regulation, VIN ≥ VOUT(NOM) + VDO, VOUT can overshoot VOUT(NOM) during fast transients. 7.4.3 Disabled The output is shut down by forcing the enable pin below VLO. When disabled, the pass device is turned off, internal circuits are shut down, and the output voltage is actively discharged to ground by an internal switch from the output to ground. The active pulldown resistor is on when sufficient input voltage is provided. |
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同様の説明 - TLV75533PDQNT |
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