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DRV8714-Q1 Datasheet(PDF) 34 Page - Texas Instruments |
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DRV8714-Q1 Datasheet(HTML) 34 Page - Texas Instruments |
34 / 144 page Digital Core Level Shifter VVCP GHx SHx VBAT DRAIN IDRVN IDRVP ISTRONG IHOLD VVCP High-Side Gate Driver VGS + ± VSH + ± VSH + ± VDRAIN VPGNDx VDS + ± VDRAIN Threshold Detectors Overcurrent Detector Handshaking Level Shifter VVCP GLx PGNDx IDRVN IDRVP ISTRONG IHOLD VVCP Low-Side Gate Driver VGS + ± VDS + ± VSHx Overcurrent Detector Handshaking GND Figure 8-11. Gate Driver Functional Block Diagram 8.3.4.2 Slew Rate Control (IDRIVE) The IDRIVE component of the smart gate drive architecture implements adjustable gate drive current control to adjust the external MOSFET VDS slew rate. This is achieved by implementing adjustable pull up (IDRVP) and pull down (IDRVN) current sources for the internal gate driver architecture. The external MOSFET VDS slew rates are a critical factor for optimizing radiated and conducted emissions, diode reverse recovery, dV/dt parasitic gate coupling, and overvoltage or undervoltage transients on the switch- node of the half-bridge. IDRIVE operates on the principle that the VDS slew rates are predominantly determined by the rate of the gate charge (or gate current) delivered during the MOSFET QGD or Miller charging region. By allowing the gate driver to adjust the gate current, it can effectively control the slew rate of the external power MOSFETs. IDRIVE allows the DRV871x-Q1 to dynamically change the gate driver current setting through the IDRVP_x and IDRVN_x SPI registers or IDRIVE pin on H/W interface devices. The device provides 16 settings between the 0.5-mA and 62-mA range for the source and sink currents as shown in Table 8-16. The peak gate drive current is available for the tDRIVE duration. After the MOSFET is switched and the tDRIVE duration expires, the gate driver switches to a hold current (IHOLD) for the pull up source current to limit the output current in case of a short circuit condition and to improve the efficiency of the driver. DRV8714-Q1, DRV8718-Q1 SLVSEA2 – AUGUST 2020 www.ti.com 34 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: DRV8714-Q1 DRV8718-Q1 |
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