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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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DRV8353M Datenblatt(PDF) 60 Page - Texas Instruments |
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DRV8353M Datenblatt(HTML) 60 Page - Texas Instruments |
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60 / 76 page  DRIVEN2 13 nC I 87 mA 150 ns (12) Select a value for IDRIVEN that is between 87 mA and 260 mA. For this example, the value of IDRIVEN was selected as 200-mA sink. 14.2.1.2.3 VDS Overcurrent Monitor Configuration The VDS monitors are configured based on the worst-case motor current and the RDS(on) of the external MOSFETs as shown in Equation 13. DS _ OCP max DS(on)max V I R ! u (13) 14.2.1.2.3.1 VDS Overcurrent Example The goal of this example is to set the VDS monitor to trip at a current greater than 75 A. According to the CSD19535KCS 100 V N-Channel NexFET™ Power MOSFET data sheet, the RDS(on) value is 2.2 times higher at 175°C, and the maximum RDS(on) value at a VGS of 10 V is 3.6 mΩ at TA = 25°C. From these values, the approximate worst-case value of RDS(on) is 2.2 × 3.6 mΩ = 7.92 mΩ. Using Equation 14 with a value of 7.92 mΩ for RDS(on) and a worst-case motor current of 75 A, Equation 14 shows the calculated desired value of the VDS overcurrent monitors. DS _ OCP DS _ OCP V 75 A 7.92 m V 0.594 V ! u : ! (14) For this example, the value of VDS_OCP was selected as 0.6 V. The SPI devices allow for adjustment of the deglitch time for the VDS overcurrent monitor. The deglitch time can be set to 1 µs, 2 µs, 4 µs, or 8 µs. 14.2.1.2.4 Sense-Amplifier Bidirectional Configuration The sense amplifier gain on the DRV8353M and sense resistor value are selected based on the target current range, VREF reference voltage, sense-resistor power rating, and operating temperature range. In bidirectional operation of the sense amplifier, the dynamic range at the output is approximately calculated as shown in Equation 15. VREF O VREF V V V 0.25 V 2 (15) Use Equation 16 to calculate the approximate value of the selected sense resistor with VO calculated using Equation 15. 2 O SENSE RMS V V R P I R A I ! u u (16) From Equation 15 and Equation 16, select a target gain setting based on the power rating of the target sense resistor. 14.2.1.2.4.1 Sense-Amplifier Example In this system example, the value of VREF voltage is 3.3 V with a sense current from –40 to +40 A. The linear range of the SOx output is 0.25 V to VVREF – 0.25 V (from the VLINEAR specification). The differential range of the sense amplifier input is –0.3 to +0.3 V (VDIFF). O 3.3 V V 3.3 V 0.25 V 1.4 V 2 (17) DRV8353M SLVSFO2 – JULY 2020 www.ti.com 60 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: DRV8353M |
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Ähnliche Beschreibung - DRV8353M |
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