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LM25183-Q1 Folha de dados(PDF) 15 Page - Texas Instruments

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Nome de Peças LM25183-Q1
Descrição Electrónicos  LM25183-Q1 42-VIN PSR Flyback DC/DC Converter with 65-V, 2.5-A Integrated MOSFET
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM25183-Q1 Folha de dados(HTML) 15 Page - Texas Instruments

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LM25183-Q1
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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.


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