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LM74700-Q1 Fiches technique(PDF) 7 Page - Texas Instruments |
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LM74700-Q1 Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 18 page 0V VIN VANODE VCAP-VANODE VEN 6 V 9 V 15 V GATE DRIVER ENABLE TON TOFF VCAPUVLO 7 LM74700-Q1 www.ti.com SNOSD17 – OCTOBER 2017 Product Folder Links: LM74700-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7.3 Feature Description 7.3.1 Input Voltage The ANODE pin is used to power the LM74700-Q1's internal circuitry, typically drawing 30 µA when enabled and 3 µA when disabled. If the ANODE pin voltage is greater then specified minimum operating voltage, the LM74700-Q1 operates in either shutdown mode or conduction mode in accordance with the EN pin voltage. The voltage from ANODE to GND is designed to vary from 65 V to –65 V, allowing the LM74700-Q1 to withstand negative voltage transients or inputs from an AC source. 7.3.2 Charge Pump The charge pump supplies the voltage necessary to drive the external N-channel MOSFET. An external capacitor is placed between VCAP and ANODE to provide energy allowing the external MOSFET to be turned on quickly. In order for the charge pump to supply current to the external capacitor, the ANODE to GND voltage must be greater than the specified minimum operating voltage, and the EN pin must be above the specified input high threshold. If both of these conditions are not achieved, the charge pump remains disabled. To ensure that the external MOSFET can be driven above its specified threshold voltage, the VCAP to ANODE voltage must be above the undervoltage lockout threshold, typically 6 V, before the internal gate driver is enabled. To remove any chatter on the gate drive approximately 600 mV of hysteresis is added to the VCAP undervoltage lockout. The charge pump remains enabled until the VCAP to ANODE voltage reaches 15 V, typically, at which point the charge pump is disabled decreasing the current draw on the ANODE pin. The charge pump remains disabled until the VCAP to ANODE voltage is below to 9 V typically at which point the charge pump is enabled. The voltage between VCAP and ANODE continue to charge and discharge between 9 V and 15 V as shown in Figure 1. By enabling and disabling the charge pump, the ANODE pin current of the LM74700-Q1 is greatly reduced. The ANODE pin typically sinks 1.5 mA when the charge pump is enabled . When the charge pump is disabled the ANODE pin typically sinks 30 µA. Figure 1. Charge Pump Operation |
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