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BQ77904 データシート(PDF) 27 Page - Texas Instruments |
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BQ77904 データシート(HTML) 27 Page - Texas Instruments |
27 / 46 page 9 Application and Implementation Note Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information The BQ77904 and BQ77905 devices are low-power stackable battery pack protectors with an integrated low- side NMOS FET driver. The BQ77904 and BQ77905 devices provide voltage, current, temperature, and open- wire protections. All the devices protect and recover without MCU control. The following section highlights several recommended implementation when using these devices. 9.1.1 Recommended System Implementation 9.1.1.1 CHG and DSG FET Rise and Fall Time The CHG and DSG FET drivers are designed to have fast switching time. Users should select a proper gate resistor (RCHG and RDSG in the reference schematic) to set to the desired rise/fall time. Q1 Q2 PACK- CHG RSNS RDSG RCHG RGS_DSG RGS_CHG DSG Select proper gate resistor to adjust the desired rise/fall time Figure 9-1. Select Proper Gate Resistor for FET Rise and Fall Time The CHG FET fall time is generally slower, because it is connected to the PACK– terminal. The CHG driver will pull to VSS quickly when the driver is signaled to turn off. Once the gate of the CHG FET reaches ground or Vgsth, the PACK– will start to fall below ground and the CHG signal will follow suit in order to turn off the CHG FET. This portion of the fall time is strongly dependent on the FET characteristic, the number of FETs in parallel, and the value of gate-source resistor (RGS_CHG). www.ti.com BQ77904, BQ77905 SLUSCM3K – APRIL 2020 – REVISED JULY 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 27 Product Folder Links: BQ77904 BQ77905 |
同様の部品番号 - BQ77904_V04 |
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同様の説明 - BQ77904_V04 |
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