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LM74700QDBVRQ1 Datasheet(PDF) 6 Page - Texas Instruments |
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LM74700QDBVRQ1 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 18 page VANODE Charge Pump Enable Logic VANODE VCAP VCAP + ± Q R S Q + ± + ± + ± GM AMP + ± + ± 20 mV 50 mV -5 mV VCAP COMPARTOR COMPARTOR VCAP_UV VCAP_UV ENABLE LOGIC ENGATE GATE DRIVER ENABLE LOGIC REVERSE PROTECTION LOGIC VANODE Bias Rails VANODE ANODE GATE CATHODE VCAP_UV VANODE VCAP EN GND Charge Pump Copyright © 2017, Texas Instruments Incorporated 6 LM74700-Q1 SNOSD17 – OCTOBER 2017 www.ti.com Product Folder Links: LM74700-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LM74700-Q1 ideal diode control has all the features necessary to implement an efficient and fast reverse polarity protection circuit or be used in an ORing configuration while minimizing the number of external components. This easy to use ideal diode controller is paired with an external N-channel MOSFET to replace other reverse polarity schemes such as a P-channel MOSFET or a Schottky diode. An internal charge pump is used to drive the external N-Channel MOSFET to a maximum gate drive voltage of approximately 15 V. The charge pump allows the N-channel MOSFET to be enhance without refresh pulses that disable the N-channel MOSFET. The voltage drop across the MOSFET is continuously monitored between the ANODE and CATHODE pins, and the GATE to ANODE voltage is adjusted as needed to drive the N-channel MOSFET. During light load currents, the forward voltage drop of the N-channel MOSFET is regulated to 20 mV. At heavier load conditions, the MOSFET is fully enhanced and the voltage drop is proportional to the load current and RDS(ON) of the selected MOSFET. A reverse current condition is detected when there is –5 mV between the ANODE and CATHODE pin, resulting in the GATE pin being internally connected to the ANODE pin turning off the external N- channel MOSFET, and utilizing the body diode to block any the reverse current. An enable pin (EN) is available to place the LM74700-Q1 in shutdown mode disabling the N-Channel MOSFET and minimizing the quiescent current. 7.2 Functional Block Diagram |
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