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DRV8461SPWPR 数据表(PDF) 54 Page - Texas Instruments |
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DRV8461SPWPR 数据表(HTML) 54 Page - Texas Instruments |
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54 / 117 page  f c Frequency Energy Unmodulated Modulated EMI Peak Reduction Figure 7-36. EMI Reduction by Spread Spectrum, Frequency Modulation When the DRV8461 is configured with the SPI interface, spread spectrum can be enabled or disabled by the DIS_SSC bit. By default, spread spectrum is disabled after power-up. Writing 0b to the DIS_SSC bit enables spread spectrum. If the device is operating with silent step decay mode, spread spectrum is disabled. Additionally, when the DRV8461 is configured with the GPIO interface, spread spectrum is disabled. There are many ways to implement spread spectrum. The DRV8461 uses the triangular analog modulation profile. Figure 7-37 and Figure 7-38 show the spread spectrum profiles of the internal digital clock and the charge pump clock around their respective centre frequencies. The digital clock varies by equal amounts over 14 steps between 9 MHz and 11 MHz. Note that the centre frequencies themselves will vary with process and temperature changes, and the variations due to spread spectrum will be in addition to those. Spread spectrum ON 10 MHz Triangular Modulation Spread spectrum OFF Digital Clock Frequency 11 MHz 9 MHz 1.2 µs 1.2 µs x 14 = 16.8 µs 16.8 µs DIS_SSC 1b 0b Figure 7-37. Triangular Spread Spectrum of Internal Digital Clock Spread spectrum ON 357 kHz Spread spectrum OFF Charge Pump Frequency 416 kHz 312 kHz 2.8 µs 2.8 µs x 4 = 11.2 µs 11.2 µs DIS_SSC 1b 0b 333 kHz 384 kHz Triangular Modulation Figure 7-38. Triangular Spread Spectrum of Charge Pump Clock DRV8461 SLOSE98 – DECEMBER 2022 www.ti.com 54 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: DRV8461 |
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