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LM74700QDBVRQ1 Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza LM74700QDBVRQ1
Descripción Electrónicos  Low IQ Always ON Smart Diode Controller
Download  18 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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LM74700QDBVRQ1 Datasheet(HTML) 9 Page - Texas Instruments

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LM74700-Q1
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SNOSD17 – OCTOBER 2017
Product Folder Links: LM74700-Q1
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Copyright © 2017, Texas Instruments Incorporated
Device Functional Modes (continued)
7.4.2 Conduction Mode
Conduction mode occurs when the gate driver is enabled. There are three regions of operating during conduction
mode based on the ANODE to CATHODE voltage of the LM74700-Q1. Each of the three modes is described in
Regulated Conduction Mode, Full Conduction Mode and Reverse Current Protection Mode.
7.4.2.1 Regulated Conduction Mode
For the LM74700-Q1 to operate in regulated conduction mode, the gate driver must be enabled as described in
Gate Driver and the current from source to drain of the external MOSFET must be within the range to result in an
ANODE to CATHODE voltage drop of –5 mV to 50 mV. During forward regulation mode the ANODE to
CATHODE voltage is regulated to 20 mV by adjusting the GATE to ANODE voltage. By regulation this voltage
the power loss of the external MOSFET can be minimized while resulting in fast turnoff in result of any reverse
current.
7.4.2.2 Full Conduction Mode
For the LM74700-Q1 to operate in full conduction mode the gate driver must be enabled as described in Gate
Driver and the current from source to drain of the external MOSFET must be large enough to result in an
ANODE to CATHODE voltage drop of greater than 50 mV typically. If these conditions are achieved the GATE
pin is internally connected to the VCAP pin resulting in the GATE to ANODE voltage being approximately the
same as the VCAP to ANODE voltage. By connecting VCAP to GATE the external MOSFET's RDS(ON) is
minimized reducing the power loss of the external MOSFET when forward currents are large.
7.4.2.3 Reverse Current Protection Mode
For the LM74700-Q1 to operate in reverse current protection mode, the gate driver must be enabled as
described in Gate Driver and the current of the external MOSFET must be flowing from the drain to the source.
When the ANODE to CATHODE voltage is typically less than –5 mV reverse current protection mode is entered
and the GATE pin is internally connected to the ANODE pin. The connection of the GATE to ANODE pin
disables the external MOSFET. The body diode of the MOSFET blocks any reverse current from flowing from the
drain to source.


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