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LM74700QDBVRQ1 Datasheet(PDF) 9 Page - Texas Instruments |
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LM74700QDBVRQ1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page 9 LM74700-Q1 www.ti.com SNOSD17 – OCTOBER 2017 Product Folder Links: LM74700-Q1 Submit Documentation Feedback 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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