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LM25183-Q1 Folha de dados(PDF) 15 Page - Texas Instruments |
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LM25183-Q1 Folha de dados(HTML) 15 Page - Texas Instruments |
15 / 40 page 15 LM25183-Q1 www.ti.com SNVSBJ4 – APRIL 2020 Product Folder Links: LM25183-Q1 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated 7.4 Device Functional Modes 7.4.1 Shutdown Mode EN/UVLO facilitates ON and OFF control for the LM25183-Q1. When VEN/UVLO is below approximately 0.6 V, the device is in shutdown mode. Both the internal LDO and the switching regulator are off. The quiescent current in shutdown mode drops to 3 μA at VIN = 24 V. The LM25183-Q1 also employs internal bias rail undervoltage protection. If the internal bias supply voltage is below its UV threshold, the converter remains off. 7.4.2 Standby Mode The internal bias rail LDO regulator has a lower enable threshold than the converter itself. When VEN/UVLO is above 0.6 V and below the precision-enable threshold (1.5 V typically), the internal LDO is on and regulating. The precision enable circuitry is turned on once the internal VCC is above its UV threshold. The switching action and voltage regulation are not enabled until VEN/UVLO rises above the precision enable threshold. 7.4.3 Active Mode The LM25183-Q1 is in active mode when VEN/UVLO is above the precision-enable threshold and the internal bias rail is above its UV threshold. The LM25183-Q1 operates in one of three modes depending on the load current requirement: 1. Boundary conduction mode (BCM) at heavy loads 2. Discontinuous conduction mode (DCM) at medium loads 3. Frequency foldback mode (FFM) at light loads Refer to the PSR Flyback Modes of Operation section for more detail. |
Nº de peça semelhante - LM25183-Q1 |
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Descrição semelhante - LM25183-Q1 |
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